Materiały źródłowe

• #1 Serotonin Syndrome – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK482377/

  Serotonin syndrome, also known as serotonin toxicity, poses a significant clinical challenge due to its potentially life-threatening nature and diverse etiology. […] The diagnosis of serotonin syndrome is clinical, which provides challenges in rapid and accurate diagnosis. Several criteria exist for this clinical diagnosis, but the Hunter criteria are generally the most broadly used. Healthcare professionals must take a detailed medical history and assess the patient’s medication regimen to arrive at an accurate diagnosis. […] Several diagnostic criteria are available, including Sternbach, Radomski, and Hunter. However, the Hunter Toxicity Criteria Decision Rules are accepted as the most accurate. The Hunter Criteria is recommended as it has been demonstrated to be the most accurate compared to the gold standard diagnosis of a medical toxicologist, with 84% sensitivity and 97% specificity.

• #2 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #3 Serotonin syndrome (serotonin toxicity) – UpToDate

  https://www.uptodate.com/contents/serotonin-syndrome-serotonin-toxicity

  Serotonin syndrome is diagnosed on the basis of clinical findings. […] We suggest diagnosing serotonin syndrome using the Hunter Toxicity Criteria Decision Rules (algorithm 1). […] To fulfill the Hunter Criteria, a patient must have the presence of a serotonergic agent and meet one of the following conditions: […] Serotonin syndrome is typically not a diagnosis of exclusion if the Hunter Criteria are met. […] Several sets of diagnostic criteria have been developed to define serotonin syndrome, of which the Hunter Criteria are most accurate (84 percent sensitive and 97 percent specific when compared with the gold standard of diagnosis by a medical toxicologist).

• #4 Serotonin Syndrome: What It Is, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17687-serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening drug reaction that results from having too much serotonin in your body. […] Your healthcare provider usually makes the diagnosis based on the results of your physical exam, review of your symptoms and history of medications you take that affect serotonin levels. […] There arent any tests to diagnose serotonin symptoms. […] If your symptoms are mild, stopping the medication or changing your dose usually makes symptoms go away within 24 to 72 hours. […] If your case of serotonin syndrome was caused by an antidepressant, it may take several weeks for the medication to clear your body and for your symptoms to completely go away. […] If you have symptoms (or worsening symptoms) of serotonin syndrome, call your healthcare provider right away or go to an emergency room.

• #5 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #6 Serotonin syndrome – Diagnosis & treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/serotonin-syndrome/diagnosis-treatment/drc-20354764

  No single test can confirm a serotonin syndrome diagnosis. Your doctor will diagnose the condition by ruling out other possibilities. […] Your doctor will likely begin by asking about your symptoms, medical history and any medications you’re taking. Your doctor will also conduct a physical examination. […] To make sure your symptoms are caused by serotonin syndrome and not due to another cause, your doctor may use tests to: […] Your doctor may order additional tests to rule out other causes of your symptoms. Tests may include:

• #7 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #8 Serotonin syndrome: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/007272.htm

  Serotonin syndrome (SS) is a potentially life-threatening drug reaction. It causes the body to have too much serotonin, a chemical produced by some nerve cells. […] The diagnosis is usually made by asking the person questions about medical history, including the types of medicines they take. To be diagnosed with SS, the person must have been taking a drug that changes the body’s serotonin level (serotonergic drug) and have at least three of the following signs or symptoms: […] SS is not diagnosed until all other likely causes have been ruled out. This may include infections, intoxication, metabolic and hormone problems, and drug or alcohol withdrawal. […] If a person has just started taking or increased the dosage of a tranquilizer (neuroleptic drug), other conditions such as neuroleptic malignant syndrome (NMS) will be considered. […] Contact your provider right away if you have symptoms of SS.

• #9 Serotonin syndrome: Preventing, recognizing, and treating it | Cleveland Clinic Journal of Medicine

  https://www.ccjm.org/content/83/11/810

  As the use of serotonergic agents to treat depression has increased, so too has the incidence of serotonin syndrome. […] Diagnosis requires a low threshold for suspicion and a meticulous history and physical examination. […] Currently, there are two clinical tools for diagnosing serotonin syndrome: the Hunter serotonin toxicity criteria and the Sternbach criteria. […] The Hunter criteria are recommended and are more specific (97% vs 96%) and more sensitive (84% vs 75%) than the Sternbach criteria when compared with the gold standard of diagnosis by a clinical toxicologist. […] Serotonin syndrome is a clinical diagnosis and therefore requires a thorough review of medications and physical examination. Serum serotonin levels are an unreliable indicator of toxicity and do not correlate well with the clinical presentation.

• #10 Serotonin Syndrome – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK482377/

  Serotonin syndrome, also known as serotonin toxicity, poses a significant clinical challenge due to its potentially life-threatening nature and diverse etiology. […] The diagnosis of serotonin syndrome is clinical, which provides challenges in rapid and accurate diagnosis. Several criteria exist for this clinical diagnosis, but the Hunter criteria are generally the most broadly used. Healthcare professionals must take a detailed medical history and assess the patient’s medication regimen to arrive at an accurate diagnosis. […] Several diagnostic criteria are available, including Sternbach, Radomski, and Hunter. However, the Hunter Toxicity Criteria Decision Rules are accepted as the most accurate. The Hunter Criteria is recommended as it has been demonstrated to be the most accurate compared to the gold standard diagnosis of a medical toxicologist, with 84% sensitivity and 97% specificity.

• #11 Serotonin syndrome (serotonin toxicity) – UpToDate

  https://www.uptodate.com/contents/serotonin-syndrome-serotonin-toxicity/print

  Serotonin syndrome is diagnosed on the basis of clinical findings. […] We suggest diagnosing serotonin syndrome using the Hunter Toxicity Criteria Decision Rules (algorithm 1). […] To fulfill the Hunter Criteria, a patient must have the presence of a serotonergic agent and meet one of the following conditions: Spontaneous clonus; Inducible clonus plus agitation or diaphoresis; Ocular clonus plus agitation or diaphoresis; Tremor plus hyperreflexia; Hypertonia plus temperature above 38°C PLUS ocular clonus or inducible clonus. […] Several sets of diagnostic criteria have been developed to define serotonin syndrome, of which the Hunter Criteria are most accurate (84 percent sensitive and 97 percent specific when compared with the gold standard of diagnosis by a medical toxicologist).

• #12 Serotonin syndrome (serotonin toxicity) – UpToDate

  https://www.uptodate.com/contents/serotonin-syndrome-serotonin-toxicity/print

  Serotonin syndrome is diagnosed on the basis of clinical findings. […] We suggest diagnosing serotonin syndrome using the Hunter Toxicity Criteria Decision Rules (algorithm 1). […] To fulfill the Hunter Criteria, a patient must have the presence of a serotonergic agent and meet one of the following conditions: Spontaneous clonus; Inducible clonus plus agitation or diaphoresis; Ocular clonus plus agitation or diaphoresis; Tremor plus hyperreflexia; Hypertonia plus temperature above 38°C PLUS ocular clonus or inducible clonus. […] Several sets of diagnostic criteria have been developed to define serotonin syndrome, of which the Hunter Criteria are most accurate (84 percent sensitive and 97 percent specific when compared with the gold standard of diagnosis by a medical toxicologist).

• #13 Serotonin Syndrome – Injuries; Poisoning – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/injuries-poisoning/heat-illness/serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening condition resulting from increased central nervous system serotonergic activity that is usually drug related. Diagnosis is clinical. […] Diagnosis of serotonin syndrome is clinical. Various explicit criteria have been proposed. The Hunter criteria are currently preferred because of ease of use and high accuracy (almost 85% sensitivity and 95% specificity compared with diagnosis by a toxicologist). These criteria require that patients have taken a serotonergic drug and have one of the following: Muscle hypertonia, Spontaneous clonus, Tremor plus hyperreflexia, Ocular or inducible clonus, plus either agitation, diaphoresis, or temperature 38 C. […] The diagnosis is likely if patients have taken a serotonergic drug and have muscle hypertonia; spontaneous clonus; tremor plus hyperreflexia; or the combination of ocular or inducible clonus; plus either agitation, diaphoresis, or temperature 38 C. […] Serotonin syndrome can often be differentiated from neuroleptic malignant syndrome by use of serotonergic drugs, rapid onset (eg, within 24 hours of its drug trigger), and hyperreflexia.

• #14 Serotonin toxicity: a practical approach to diagnosis and treatment | The Medical Journal of Australia

  https://www.mja.com.au/journal/2007/187/6/serotonin-toxicity-practical-approach-diagnosis-and-treatment

  Excess serotonin in the central nervous system leads to a condition commonly referred to as the serotonin syndrome, but better described as a spectrum of toxicity serotonin toxicity. […] Diagnosis of serotonin toxicity is often made on the basis of the presence of at least three of Sternbachs 10 clinical features. However, these features have very low specificity. The Hunter Serotonin Toxicity Criteria use a smaller, more specific set of clinical features for diagnosis, including clonus, which has been found to be more specific to serotonin toxicity. […] A number of diagnostic criteria have been suggested for serotonin toxicity. The first and most commonly used are Sternbachs criteria. Many of the 10 clinical features suggested as typical of serotonin toxicity by Sternbach are non-specific.

• #15 Serotonin syndrome – EMCrit Project

  https://emcrit.org/ibcc/serotonin/

  Hunter diagnostic criteria are shown below. […] Criteria are not 100% specific, so you also need to pay attention to the differential diagnosis. […] Among various criteria, the Hunter Criteria seem to be the best. Compared to evaluation by a medical toxicologist, these criteria are 84% sensitive and 97% specific. […] Of course, rigid application of criteria should never supersede clinical judgement. […] These criteria place clonus at the center of the diagnosis (as discussed above). Unfortunately, clonus may be masked among patients with an underlying peripheral neuropathy. […] Defining precisely whether or not a patient has serotonin syndrome is tough because this is a spectrum disorder that ranges from mild to severe. Very mild serotonin syndrome might not meet the Hunter Criteria (which are more specific than sensitive).

• #16 Serotonin Syndrome | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/28918

  A detailed history of medications, supplements, and illicit substance use should be obtained if serotonin syndrome is suspected. […] The physical examination is crucial in differentiating serotonin syndrome from other acute syndromes with overlapping symptoms. […] Serotonin syndrome is a clinical diagnosis, and no diagnostic laboratory studies are indicated. Still, laboratory evaluations can assist in clarifying the clinical picture, assessing the severity of serotonin syndrome, and directing the treatment plan.

• #17 Serotonin Syndrome: Causes, Symptoms, and Treatment

  https://www.webmd.com/brain/serotonin-syndrome-causes-symptoms-treatments

  No single test can tell your doctor that you have serotonin syndrome. Instead, theyll ask about your medical historyincluding your use of medications, supplements, and recreational drugsand do a physical exam. It’s important to be honest with your doctor, even when it comes to taking illegal drugs. They won’t get you into any trouble for using them. They care about helping you, not judging you. […] They may order lab tests to rule out other health conditions that can look like serotonin syndrome, such as tetanus, sepsis, encephalitis, or heatstroke. These tests may include: […] Serotonin syndrome will usually last for 24 to 72 hours in most people if the condition is discovered and treated properly. […] To figure out if you have serotonin syndrome or NMS, your doctor will carefully look at your medication history and perform different tests.

• #18 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #19 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #20 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #21 Serotonin syndrome – Symptoms, diagnosis and treatment | BMJ Best Practice

  https://bestpractice.bmj.com/topics/en-gb/991

  Serotonin syndrome is the clinical manifestation of excess serotonin in the central nervous system, resulting from the therapeutic use or overdose of serotonergic drugs. […] Diagnosis is clinical and should be based on the Hunter Serotonin Toxicity Criteria (HSTC), of which clonus is a key diagnostic feature. […] Key diagnostic factors include presence of risk factors, clonus, and hyper-reflexia. […] Other diagnostic factors include anxiety, agitation, confusion, tremor, shivering, muscle jerking, sweating, headache, tachycardia, hypertonia/rigidity, diaphoresis, flushing, dilated pupils, hyperthermia, myoclonus, and startling. […] 1st investigations to order include clinical diagnosis.

• #22 Prevention, Diagnosis, and Management of Serotonin Syndrome | AAFP

  https://www.aafp.org/pubs/afp/issues/2010/0501/p1139.html

  Serotonin syndrome is a potentially life-threatening condition caused by excessive serotonergic activity in the nervous system. Diagnosis is made using the Hunter Serotonin Toxicity Criteria, which require the presence of one of the following classical features or groups of features: spontaneous clonus; inducible clonus with agitation or diaphoresis; ocular clonus with agitation or diaphoresis; tremor and hyperreflexia; or hypertonia, temperature above 100.4 F (38 C), and ocular or inducible clonus. […] The diagnosis of serotonin syndrome depends on identifying autonomic instability, neuromuscular signs, and cognitive-behavioral changes in the presence of serotonergic medication use. Symptoms can develop rapidly, often within minutes of drug ingestion, although most patients present within six to 24 hours after a medication change or overdose.

• #23 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  The many differential diagnoses to consider when diagnosing serotonin syndrome include neuroleptic malignant syndrome (NMS), malignant hyperthermia, anticholinergic toxicity, serotonergic discontinuation syndrome, sympathomimetic drug intoxication, meningitis, encephalitis, heat stroke, and central hyperthermia. Some diagnoses may be distinguished from serotonin syndrome by the clinical features, medication usage, and time course. The distinguishing features of NMS, malignant hyperthermia, and anticholinergic toxicity are listed in Table 2.

• #24 Serotonin Syndrome: Practice Essentials, Problem, Management

  https://emedicine.medscape.com/article/2500075-overview

  Serotonin syndrome can be precipitated by pharmaceuticals, botanicals, and recreational drugs. The diagnosis is based on clinical symptoms rather than on any particular laboratory studies; the Hunter criteria are most often used for this purpose. […] Diagnosis of serotonin syndrome can be challenging, particularly in the perioperative setting. […] Serotonin syndrome is diagnosed on the basis of clinical manifestations, as well as a comprehensive medication review. Perioperative diagnosis of serotonin syndrome can be facilitated by the use of the Hunter serotonin toxicity criteria, which are based on a specific set of clinical features in specific combinations and which have a sensitivity of 84% and a specificity of 97%. […] According to the Hunter criteria, the patient must have taken a serotoninergic agent within the preceding 5 weeks and must also have one of the following: Muscle rigidity plus temperature higher than 38C plus ocular clonus/inducible clonus; Ocular clonus plus agitation/diaphoresis; Inducible clonus plus agitation/diaphoresis; Spontaneous clonus; Tremor plus hyperreflexia; Hypertonia.

• #25 Neuroleptic Malignant Syndrome or Serotonin Syndrome?

  https://www.medsafe.govt.nz/profs/PUArticles/Dec2012Neuroleptic.htm

  Neuroleptic malignant syndrome (NMS) and serotonin syndrome are rare, life-threatening, medicine-induced disorders. […] Both syndromes share clinical features, such as pyrexia, hypertonia and changes in mental state, making differentiation difficult. […] Differentiation is important as pharmacologic treatment is dependent on the causative agent. […] The presence of neuromuscular excitation such as clonus (involuntary, rhythmic muscular contractions and relaxations) and hyperreflexia are strongly predictive of serotonin syndrome. […] Knowledge of medication use may also aid diagnosis. […] Symptoms of NMS and serotonin syndrome have been misinterpreted as symptoms of mental illness. […] If a patient develops signs and symptoms indicative of NMS or serotonin syndrome, or presents with unexplained high fever without additional clinical manifestations, treatment with dopamine antagonists or serotonergic medicines should be discontinued immediately and supportive therapy administered. […] Administration of serotonin antagonists may be considered for serotonin toxicity, whilst dopaminergic agents and dantrolene may be considered for NMS. […] Differentiation is important when considering treatment options and future use of causative medicines.

• #26 Serotonin syndrome – Wikipedia

  https://en.wikipedia.org/wiki/Serotonin_syndrome

  Serotonin toxicity has a characteristic picture which is generally hard to confuse with other medical conditions, but in some situations it may go unrecognized because it may be mistaken for a viral illness, anxiety disorders, neurological disorder, anticholinergic poisoning, sympathomimetic toxicity, or worsening psychiatric condition. […] The condition most often confused with serotonin syndrome is neuroleptic malignant syndrome (NMS). […] However, they are actually very different conditions with different underlying dysfunction (serotonin excess vs dopamine blockade). […] Management is based primarily on stopping the usage of the precipitating drugs, the administration of serotonin antagonists such as cyproheptadine, and supportive care including the control of agitation, the control of autonomic instability, and the control of hyperthermia. […] The intensity of therapy depends on the severity of symptoms.

• #27 Serotonin Syndrome – Injuries; Poisoning – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/injuries-poisoning/heat-illness/serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening condition resulting from increased central nervous system serotonergic activity that is usually drug related. Diagnosis is clinical. […] Diagnosis of serotonin syndrome is clinical. Various explicit criteria have been proposed. The Hunter criteria are currently preferred because of ease of use and high accuracy (almost 85% sensitivity and 95% specificity compared with diagnosis by a toxicologist). These criteria require that patients have taken a serotonergic drug and have one of the following: Muscle hypertonia, Spontaneous clonus, Tremor plus hyperreflexia, Ocular or inducible clonus, plus either agitation, diaphoresis, or temperature 38 C. […] The diagnosis is likely if patients have taken a serotonergic drug and have muscle hypertonia; spontaneous clonus; tremor plus hyperreflexia; or the combination of ocular or inducible clonus; plus either agitation, diaphoresis, or temperature 38 C. […] Serotonin syndrome can often be differentiated from neuroleptic malignant syndrome by use of serotonergic drugs, rapid onset (eg, within 24 hours of its drug trigger), and hyperreflexia.

• #28 Neuroleptic Malignant Syndrome or Serotonin Syndrome?

  https://www.medsafe.govt.nz/profs/PUArticles/Dec2012Neuroleptic.htm

  Neuroleptic malignant syndrome (NMS) and serotonin syndrome are rare, life-threatening, medicine-induced disorders. […] Both syndromes share clinical features, such as pyrexia, hypertonia and changes in mental state, making differentiation difficult. […] Differentiation is important as pharmacologic treatment is dependent on the causative agent. […] The presence of neuromuscular excitation such as clonus (involuntary, rhythmic muscular contractions and relaxations) and hyperreflexia are strongly predictive of serotonin syndrome. […] Knowledge of medication use may also aid diagnosis. […] Symptoms of NMS and serotonin syndrome have been misinterpreted as symptoms of mental illness. […] If a patient develops signs and symptoms indicative of NMS or serotonin syndrome, or presents with unexplained high fever without additional clinical manifestations, treatment with dopamine antagonists or serotonergic medicines should be discontinued immediately and supportive therapy administered. […] Administration of serotonin antagonists may be considered for serotonin toxicity, whilst dopaminergic agents and dantrolene may be considered for NMS. […] Differentiation is important when considering treatment options and future use of causative medicines.

• #29 Serotonin Syndrome: Practice Essentials, Problem, Management

  https://emedicine.medscape.com/article/2500075-overview

  Although laboratory abnormalities alone are not definitively diagnostic of serotonin syndrome, they can certainly support the diagnosis. An elevated CPK can be suggestive of hypermetabolism, which is seen in serotonin syndrome. Also, as noted earlier, elevations in WBC counts and bilirubin levels, as well as decreases in bicarbonate levels, can be associated with serotonin syndrome. […] EEG may be useful in supporting the diagnosis of serotonin syndrome. Case reports of serotonin syndrome have shown the following EEG abnormalities: delta range activity, slow waves, spike and waves, polyspike and waves, and triphasic waves. These are not typically expected in NMS or tardive dyskinesia.

• #30 Serotonin Syndrome: Symptoms, Causes, Diagnosis, Treatment

  https://www.healthline.com/health/serotonin-syndrome

  Serotonin syndrome can occur if you take too much medication that boosts serotonin levels. […] How is serotonin syndrome diagnosed? […] Theres no specific laboratory test for serotonin syndrome. Your doctor may begin by reviewing your medical history and symptoms. […] Your doctor will usually perform several other tests. These will help your doctor find out if certain organs or body functions have been affected. […] Tests your doctor may order include: a complete blood count (CBC), a blood culture, thyroid function tests, drug screens, kidney function tests, liver function tests. […] Some conditions have similar symptoms to serotonin syndrome. […] A condition known as neuroleptic malignant syndrome also has similar symptoms. Its an adverse reaction to medications used to treat some mental health conditions.

• #31 Selective Serotonin Reuptake Inhibitor Toxicity Workup: Approach Considerations, Laboratory Studies, Imaging Studies

  https://emedicine.medscape.com/article/821737-workup

  Diagnosis of serotonin toxicity begins with a detailed history of the patient’s medications, of changes to regimen, and of possible overdose; queries into the availability of serotonergic drugs; and a careful physical examination. […] Laboratory tests used in the diagnosis of serotonin toxicity may include the following: […] Imaging studies for suspected serotonin syndrome include chest radiograph after intubation or in any patient with hypoxia or aspiration. […] Intubation should be considered in any unstable patient or any patient with altered mental status who cannot protect their airway. Lumbar puncture is indicated in any patient with fever and altered mental status.

• #32 Serotonin Syndrome: Causes, Symptoms, and Treatment

  https://www.webmd.com/brain/serotonin-syndrome-causes-symptoms-treatments

  No single test can tell your doctor that you have serotonin syndrome. Instead, theyll ask about your medical historyincluding your use of medications, supplements, and recreational drugsand do a physical exam. It’s important to be honest with your doctor, even when it comes to taking illegal drugs. They won’t get you into any trouble for using them. They care about helping you, not judging you. […] They may order lab tests to rule out other health conditions that can look like serotonin syndrome, such as tetanus, sepsis, encephalitis, or heatstroke. These tests may include: […] Serotonin syndrome will usually last for 24 to 72 hours in most people if the condition is discovered and treated properly. […] To figure out if you have serotonin syndrome or NMS, your doctor will carefully look at your medication history and perform different tests.

• #33 Serotonin Syndrome: Practice Essentials, Problem, Management

  https://emedicine.medscape.com/article/2500075-overview

  Although laboratory abnormalities alone are not definitively diagnostic of serotonin syndrome, they can certainly support the diagnosis. An elevated CPK can be suggestive of hypermetabolism, which is seen in serotonin syndrome. Also, as noted earlier, elevations in WBC counts and bilirubin levels, as well as decreases in bicarbonate levels, can be associated with serotonin syndrome. […] EEG may be useful in supporting the diagnosis of serotonin syndrome. Case reports of serotonin syndrome have shown the following EEG abnormalities: delta range activity, slow waves, spike and waves, polyspike and waves, and triphasic waves. These are not typically expected in NMS or tardive dyskinesia.

• #34

• #35 The Serotonin Syndrome: From Molecular Mechanisms to Clinical Practice

  https://www.mdpi.com/1422-0067/20/9/2288

  The serotonin syndrome (SS) is a clinical condition resulting from serotonergic over-activity at synapses of the central and peripheral nervous systems. […] The diagnostic basis of SS includes the triad of altered mental status, autonomic hyperactivity, and neuromuscular abnormalities in patients exposed to any medication which increases the activation of serotonin (5-hydroxytryptamine; 5-HT) receptors in the body. […] Several diagnostic algorithms have been proposed since SS was first recognized as a discrete disease entity. […] The main challenges encountered in establishing formal diagnostic criteria are (1) the wide range of symptoms exhibited by patients affected by the disease and (2) the lack of a confirmatory laboratory test. Thus, the diagnosis of SS remains purely clinical at present.

• #36 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Several diagnostic criteria have been proposed for serotonin syndrome. The most recent diagnostic criteria are the Hunter Serotonin Toxicity Criteria (HSTC) that have replaced the older Sternbach Criteria in an attempt to simplify the diagnosis. When compared to the gold standard of diagnosis by a medical toxicologist, the HSTC are more sensitive (84% versus 75%) and specific (97% versus 96%) than the Sternbach criteria. The HSTC include the use of a serotonergic agent plus 1 of the 5 following criteria: spontaneous clonus, inducible clonus plus agitation or diaphoresis, ocular clonus plus agitation or diaphoresis, tremor and hyperreflexia, hypertonia and a temperature above 38C plus ocular or inducible clonus. Clonus and hyperreflexia are most important for the diagnosis; however, severe muscle rigidity may mask these symptoms. Prominent features of life-threatening cases include hyperthermia (38.5C), peripheral hypertonicity, and truncal rigidity because of the high risk of progression to respiratory failure. Some nonspecific laboratory abnormalities may be seen in serotonin syndrome: leukocytosis, low bicarbonate level, elevated creatinine level, and elevated transaminases. Serum serotonin concentrations do not correlate with the severity of this syndrome. […]

• #37 Prevention, Diagnosis, and Management of Serotonin Syndrome | AAFP

  https://www.aafp.org/pubs/afp/issues/2010/0501/p1139.html

  Serotonin syndrome is a potentially life-threatening condition caused by excessive serotonergic activity in the nervous system. Diagnosis is made using the Hunter Serotonin Toxicity Criteria, which require the presence of one of the following classical features or groups of features: spontaneous clonus; inducible clonus with agitation or diaphoresis; ocular clonus with agitation or diaphoresis; tremor and hyperreflexia; or hypertonia, temperature above 100.4 F (38 C), and ocular or inducible clonus. […] The diagnosis of serotonin syndrome depends on identifying autonomic instability, neuromuscular signs, and cognitive-behavioral changes in the presence of serotonergic medication use. Symptoms can develop rapidly, often within minutes of drug ingestion, although most patients present within six to 24 hours after a medication change or overdose.

• #38 Serotonin Syndrome: Short Time to Onset, Even with the First Dose

  https://www.medsafe.govt.nz/profs/PUArticles/March2016/SerotoninSyndrome.htm

  Serotonin syndrome may very rarely occur after only one dose of a serotonergic medicine. […] The majority of cases occur within 24 hours of taking the suspect medicine. […] Serotonin syndrome is a clinical diagnosis: the classic triad of clinical features includes neuromuscular excitation, autonomic nervous system dysfunction and altered mental state. […] The diagnosis should be suspected if any of these symptoms or signs are manifest after starting or increasing the dose of a potent serotonergic drug or shortly after a second serotonergic drug is added. […] Treatment involves stopping the serotonergic medicine and providing supportive care. Symptoms usually resolve within 24 hours with treatment.

• #39 Serotonin Syndrome: Short Time to Onset, Even with the First Dose

  https://www.medsafe.govt.nz/profs/PUArticles/March2016/SerotoninSyndrome.htm

  Serotonin syndrome may very rarely occur after only one dose of a serotonergic medicine. […] The majority of cases occur within 24 hours of taking the suspect medicine. […] Serotonin syndrome is a clinical diagnosis: the classic triad of clinical features includes neuromuscular excitation, autonomic nervous system dysfunction and altered mental state. […] The diagnosis should be suspected if any of these symptoms or signs are manifest after starting or increasing the dose of a potent serotonergic drug or shortly after a second serotonergic drug is added. […] Treatment involves stopping the serotonergic medicine and providing supportive care. Symptoms usually resolve within 24 hours with treatment.

• #40 Serotonin syndrome: a clinical review of current controversies

  https://www.imrpress.com/journal/JIN/19/4/10.31083/j.jin.2020.04.314/htm

  Serotonin syndrome is a state of increased central and peripheral serotonin (5-hydroxytryptamine) activity. Unless recognized and treated early, serotonin syndrome can lead to seizures, shock and death. Both substances with direct and indirect serotonergic activity can precipitate the syndrome. Serotonin syndrome can occur not only in psychiatric but also in non-psychiatric settings. Yet, clinicians may not be familiar with the condition. […] There is no gold-standard diagnostic test for SS. The diagnosis of SS is purely clinical. The diagnosis depends on signs and symptoms, identified through physical examination and history of exposure to serotonergic agents. There are three diagnostic criteria systems, Sternbach, Radomski and Hunter. All three criteria systems consider neuromuscular, autonomous and cognitive symptoms, albeit to a varying degree.

• #41 Serotonin Syndrome | Doctor

  https://patient.info/doctor/serotonin-syndrome

  Serotonin syndrome (SS) – also called serotonin toxicity – is a potentially life-threatening drug-induced condition caused by too much serotonin in the synapses of the brain. […] The syndrome is not widely recognised amongst clinicians. A failure to appreciate the syndrome means that mild cases may be overlooked; continuing or increasing the offending drug can cause progression to severe illness. […] It is underdiagnosed due to the heterogeneity of its presentation, because there are evolving diagnostic criteria, a lack of awareness amongst prescribers and mistaking of the symptoms for features of a pre-existing psychiatric illness. […] The diagnosis is likely only in the setting of starting or increasing the dose (or, indeed overdose) of a potent serotonergic drug, or shortly after a second serotonergic drug is added leading to a drug interaction. […] There are no specific confirmatory investigations – the diagnosis is clinical.

• #42 Serotonin syndrome: a rare undiagnosed cause of hyperpyrexia | The Egyptian Journal of Internal Medicine | Full Text

  https://ejim.springeropen.com/articles/10.1186/s43162-023-00223-2

  Serotonin syndrome (SS) is a rare but potentially life-threatening condition, and it is caused by increasing serotonergic activities. It is an underdiagnosed and under-reported condition. […] The diagnosis of SS is easily missed as many physicians (up to 85%) might not be aware of this syndrome as a clinical entity and hence the importance of this case to increase its awareness. […] The assessment of serotonin syndrome requires determining first whether the clinical features are consistent with serotonin toxicity, and second the severity of the toxicity, the clinical assessment should include observation for myoclonus jerks, diaphoresis, ocular clonus (slow continuous horizontal eye movements), and agitation. […] According to the presence of Hunters criteria for serotonin toxicity, (hyperthermia, marked agitation, hyperreflexia, muscle rigidity, inducible clonus, and the medical history of combined serotonergic drug intake), the diagnosis of serotonin syndrome was made.

• #43 Neuroleptic Malignant Syndrome or Serotonin Syndrome?

  https://www.medsafe.govt.nz/profs/PUArticles/Dec2012Neuroleptic.htm

  Neuroleptic malignant syndrome (NMS) and serotonin syndrome are rare, life-threatening, medicine-induced disorders. […] Both syndromes share clinical features, such as pyrexia, hypertonia and changes in mental state, making differentiation difficult. […] Differentiation is important as pharmacologic treatment is dependent on the causative agent. […] The presence of neuromuscular excitation such as clonus (involuntary, rhythmic muscular contractions and relaxations) and hyperreflexia are strongly predictive of serotonin syndrome. […] Knowledge of medication use may also aid diagnosis. […] Symptoms of NMS and serotonin syndrome have been misinterpreted as symptoms of mental illness. […] If a patient develops signs and symptoms indicative of NMS or serotonin syndrome, or presents with unexplained high fever without additional clinical manifestations, treatment with dopamine antagonists or serotonergic medicines should be discontinued immediately and supportive therapy administered. […] Administration of serotonin antagonists may be considered for serotonin toxicity, whilst dopaminergic agents and dantrolene may be considered for NMS. […] Differentiation is important when considering treatment options and future use of causative medicines.

• #44 Conundrums in neurology: diagnosing serotonin syndrome – a meta-analysis of cases | BMC Neurology | Full Text

  https://bmcneurol.biomedcentral.com/articles/10.1186/s12883-016-0616-1

  Serotonin syndrome is a toxic state, caused by serotonin (5HT) excess in the central nervous system. The diagnosis of serotonin syndrome remains challenging since it can only be made on clinical grounds. Three diagnostic criteria systems, Sternbach, Radomski and Hunter classifications, are available. […] The diagnosis of SS remains challenging since it can only be made on clinical grounds. There is no objective diagnostic test. Three diagnostic classification systems are available, the Sternbach (SC), Radomski (RC) and Hunter (HC) criteria. […] Currently, we do not know how well the diagnostic classification systems agree with each other. Neither do we know which system performs best, despite claims that HC is superior. […] Our findings challenge four commonly made assumptions about serotonin syndrome. […] There is only little agreement between current criteria systems for the diagnosis of SS so that clinicians need to keep an open mind about the diagnosis, even if diagnostic criteria not are met.

• #45 Serotonin syndrome: a clinical review of current controversies

  https://www.imrpress.com/journal/JIN/19/4/10.31083/j.jin.2020.04.314/htm

  Our updated systematic review of published SS cases expanded our database from 299 to 412 cases collated from 350 articles. Of all 412 cases, 42% (173) had resulted in severe SS. Of all 173 severe cases, 13% (22) resulted in death. Our updated database’s re-analysis showed that of all 412 SS cases, the Hunter criteria would have missed 37%. The Sternbach criteria would have missed 10%, and the Radomski criteria 24%. Of all 173 severe cases, the Hunter criteria would have missed 36%, and the Sternbach criteria would have missed 8% and the Radomski criteria 11%. In terms of missing cases SS overall and severe SS cases, the Hunter criteria performed worse than the Sternbach and Radomski criteria. […] Our findings suggest that the speed of onset seems to depend on pharmacokinetic and pharmacodynamic factors. Therefore, fast onset cannot be regarded as a reliable clinical sign of SS.

• #46 Serotonin Syndrome | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/28918

  Serotonin syndrome (serotonin toxicity) is a serious and potentially life-threatening condition that results from excessive serotonergic activity throughout the central nervous system. […] The diagnosis of serotonin syndrome is clinical, which provides challenges in rapid and accurate diagnosis. Several criteria exist for this clinical diagnosis, but the Hunter criteria are generally the most broadly used. Healthcare professionals must take a detailed medical history and assess the patient’s medication regimen to arrive at an accurate diagnosis. […] The Hunter Toxicity Criteria Decision Rules are accepted as the most accurate. The Hunter Criteria is recommended as it has been demonstrated to be the most accurate compared to the gold standard diagnosis of a medical toxicologist, with 84% sensitivity and 97% specificity.

• #47 EM@3AM: Serotonin Syndrome – emDocs

  https://www.emdocs.net/em3am-serotonin-syndrome/

  A 40-year-old female with history of depression is brought in by EMS for agitation. On arrival she is confused and diaphoretic. Vitals include temperature of 40°C, BP 150/80, HR 120, and RR 28. Exam is remarkable for muscle rigidity, hyperreflexia, and clonus of the lower extremities. […] Answer: Serotonin syndrome […] Diagnosis should be based on clinical evaluation. […] Serotonin syndrome is a clinical constellation of findings that result from excessive serotonin neurotransmission. It is caused by either serotonergic medications or a combination of medications that result in a hyper-serotonergic state within the central nervous system (CNS). […] Because there is no laboratory test to confirm the diagnosis of serotonin syndrome, the diagnosis is essentially clinical based on history and physical examination findings.

• #48 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #49 Serotonin Syndrome – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK482377/

  Patients with a history of stable dosing of a serotonergic agent and a history of tolerating that medication are unlikely to develop serotonin syndrome spontaneously. Therefore, Hunter Criteria has outlined clarifications for criteria 1 (history of recent exposure to a serotonergic agent) as follows: Initiation or increase in the dose of a serotonergic agent.

• #50 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #51 Serotonin Syndrome – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK482377/

  Patients with a history of stable dosing of a serotonergic agent and a history of tolerating that medication are unlikely to develop serotonin syndrome spontaneously. Therefore, Hunter Criteria has outlined clarifications for criteria 1 (history of recent exposure to a serotonergic agent) as follows: Initiation or increase in the dose of a serotonergic agent.

• #52 Serotonin Syndrome: Practice Essentials, Problem, Management

  https://emedicine.medscape.com/article/2500075-overview

  Serotonin syndrome can be precipitated by pharmaceuticals, botanicals, and recreational drugs. The diagnosis is based on clinical symptoms rather than on any particular laboratory studies; the Hunter criteria are most often used for this purpose. […] Diagnosis of serotonin syndrome can be challenging, particularly in the perioperative setting. […] Serotonin syndrome is diagnosed on the basis of clinical manifestations, as well as a comprehensive medication review. Perioperative diagnosis of serotonin syndrome can be facilitated by the use of the Hunter serotonin toxicity criteria, which are based on a specific set of clinical features in specific combinations and which have a sensitivity of 84% and a specificity of 97%. […] According to the Hunter criteria, the patient must have taken a serotoninergic agent within the preceding 5 weeks and must also have one of the following: Muscle rigidity plus temperature higher than 38C plus ocular clonus/inducible clonus; Ocular clonus plus agitation/diaphoresis; Inducible clonus plus agitation/diaphoresis; Spontaneous clonus; Tremor plus hyperreflexia; Hypertonia.

• #53 The serotonin syndrome—the need for physician’s awareness | International Journal of Emergency Medicine | Full Text

  https://intjem.biomedcentral.com/articles/10.1007/s12245-010-0195-7

  Hunter et al. have described clinical criteria for the diagnosis of this syndrome, which are 84% sensitive and 97% specific for the diagnosis of serotonin syndrome. […] Our patient was on a serotonergic agent (fluoxetine) and had inducible clonus with agitation satisfying the Hunter criteria for serotonin syndrome. […] Most cases of SS resolve within 24 h of cessation of serotonergic medications. Supportive care is recommended and involves use of intravenous fluids, cooling measures and correction of vital signs. […] In conclusion, prevention, early recognition of the clinical presentation, identification and removal of the offending agent and supportive care still remain the mainstays of the treatment of serotonin syndrome.

• #54 Serotonin Syndrome: What It Is, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17687-serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening drug reaction that results from having too much serotonin in your body. […] Your healthcare provider usually makes the diagnosis based on the results of your physical exam, review of your symptoms and history of medications you take that affect serotonin levels. […] There arent any tests to diagnose serotonin symptoms. […] If your symptoms are mild, stopping the medication or changing your dose usually makes symptoms go away within 24 to 72 hours. […] If your case of serotonin syndrome was caused by an antidepressant, it may take several weeks for the medication to clear your body and for your symptoms to completely go away. […] If you have symptoms (or worsening symptoms) of serotonin syndrome, call your healthcare provider right away or go to an emergency room.

• #55 Serotonin Syndrome: Short Time to Onset, Even with the First Dose

  https://www.medsafe.govt.nz/profs/PUArticles/March2016/SerotoninSyndrome.htm

  Serotonin syndrome may very rarely occur after only one dose of a serotonergic medicine. […] The majority of cases occur within 24 hours of taking the suspect medicine. […] Serotonin syndrome is a clinical diagnosis: the classic triad of clinical features includes neuromuscular excitation, autonomic nervous system dysfunction and altered mental state. […] The diagnosis should be suspected if any of these symptoms or signs are manifest after starting or increasing the dose of a potent serotonergic drug or shortly after a second serotonergic drug is added. […] Treatment involves stopping the serotonergic medicine and providing supportive care. Symptoms usually resolve within 24 hours with treatment.

• #56 Serotonin Syndrome: What It Is, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17687-serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening drug reaction that results from having too much serotonin in your body. […] Your healthcare provider usually makes the diagnosis based on the results of your physical exam, review of your symptoms and history of medications you take that affect serotonin levels. […] There arent any tests to diagnose serotonin symptoms. […] If your symptoms are mild, stopping the medication or changing your dose usually makes symptoms go away within 24 to 72 hours. […] If your case of serotonin syndrome was caused by an antidepressant, it may take several weeks for the medication to clear your body and for your symptoms to completely go away. […] If you have symptoms (or worsening symptoms) of serotonin syndrome, call your healthcare provider right away or go to an emergency room.

• #57 Serotonin Syndrome: What It Is, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17687-serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening drug reaction that results from having too much serotonin in your body. […] Your healthcare provider usually makes the diagnosis based on the results of your physical exam, review of your symptoms and history of medications you take that affect serotonin levels. […] There arent any tests to diagnose serotonin symptoms. […] If your symptoms are mild, stopping the medication or changing your dose usually makes symptoms go away within 24 to 72 hours. […] If your case of serotonin syndrome was caused by an antidepressant, it may take several weeks for the medication to clear your body and for your symptoms to completely go away. […] If you have symptoms (or worsening symptoms) of serotonin syndrome, call your healthcare provider right away or go to an emergency room.

• #58 Serotonin Syndrome | Iowa Veterinary Specialties

  https://www.iowaveterinaryspecialties.com/student-scholars/serotonin-syndrome

  Diagnosis of serotonin syndrome is based on history and clinical signs. A Gas Chromatography/Mass Spectrometry for medication in the blood can also be performed to confirm the presence of the drug in the dogs system. The most important parameters to monitor in dogs that have ingested 5-HTP are blood pressure, body temperature and heart rate. […] Serotonin syndrome is a drug-induced syndrome due to elevated serotonin levels in the central nervous system. Dogs are more susceptible than other species to developing serotonin syndrome.

• #59 Mystery Diagnosis: Recognizing Serotonin Syndrome

  https://rn-journal.com/journal-of-nursing/mystery-diagnosis-recognizing-serotonin-syndrome

  Awareness of causes, familiarity with screening criteria, and rapid diagnosis are essential to offering patients the safest and highest quality of care. […] The Hunter, Sternbach, and Radomski classifications are the 3 systems currently used to diagnose SS. […] One of the most commonly used diagnostic criteria systems is the Hunter criteria. […] The Hunter criteria is the most recent system used and appears to be the most reliable in diagnosis of SS, but other systems utilized prior are still helpful in diagnosis. […] It is important that the APRN is aware of the different systems used to diagnose SS. […] None of the criteria systems can be relied upon exclusively and a thorough patient history is helpful if SS is suspected.

• #60 Serotonin Syndrome | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/28918

  Serotonin syndrome (serotonin toxicity) is a serious and potentially life-threatening condition that results from excessive serotonergic activity throughout the central nervous system. […] The diagnosis of serotonin syndrome is clinical, which provides challenges in rapid and accurate diagnosis. Several criteria exist for this clinical diagnosis, but the Hunter criteria are generally the most broadly used. Healthcare professionals must take a detailed medical history and assess the patient’s medication regimen to arrive at an accurate diagnosis. […] The Hunter Toxicity Criteria Decision Rules are accepted as the most accurate. The Hunter Criteria is recommended as it has been demonstrated to be the most accurate compared to the gold standard diagnosis of a medical toxicologist, with 84% sensitivity and 97% specificity.

• #61 What Is Serotonin Syndrome? Symptoms, Causes, Diagnosis, Treatment, and Prevention

  https://www.everydayhealth.com/depression-pictures/serotonin-syndrome-things-you-need-to-know.aspx

  Making a diagnosis is sometimes difficult, as symptoms of serotonin syndrome can be mild or mimic those of other conditions, like certain infections, heat stroke, or a drug overdose, says Kaye. […] Because of the widespread use of serotonergic drugs, clinicians must maintain a high clinical suspicion for serotonin syndrome, explains Kaye. […] To make the right diagnosis and exclude other possible causes of your symptoms, doctors may run some tests, per Mayo Clinic, such as: Chest X-rays, Blood or urine samples, A computed tomography (CT) scan, A spinal tap or lumbar puncture.

• #62 Mystery Diagnosis: Recognizing Serotonin Syndrome

  https://rn-journal.com/journal-of-nursing/mystery-diagnosis-recognizing-serotonin-syndrome

  Awareness of causes, familiarity with screening criteria, and rapid diagnosis are essential to offering patients the safest and highest quality of care. […] The Hunter, Sternbach, and Radomski classifications are the 3 systems currently used to diagnose SS. […] One of the most commonly used diagnostic criteria systems is the Hunter criteria. […] The Hunter criteria is the most recent system used and appears to be the most reliable in diagnosis of SS, but other systems utilized prior are still helpful in diagnosis. […] It is important that the APRN is aware of the different systems used to diagnose SS. […] None of the criteria systems can be relied upon exclusively and a thorough patient history is helpful if SS is suspected.

• #63 Serotonin Syndrome | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/28918

  A detailed history of medications, supplements, and illicit substance use should be obtained if serotonin syndrome is suspected. […] The physical examination is crucial in differentiating serotonin syndrome from other acute syndromes with overlapping symptoms. […] Serotonin syndrome is a clinical diagnosis, and no diagnostic laboratory studies are indicated. Still, laboratory evaluations can assist in clarifying the clinical picture, assessing the severity of serotonin syndrome, and directing the treatment plan.

• #64 Mystery Diagnosis: Recognizing Serotonin Syndrome

  https://rn-journal.com/journal-of-nursing/mystery-diagnosis-recognizing-serotonin-syndrome

  Awareness of causes, familiarity with screening criteria, and rapid diagnosis are essential to offering patients the safest and highest quality of care. […] The Hunter, Sternbach, and Radomski classifications are the 3 systems currently used to diagnose SS. […] One of the most commonly used diagnostic criteria systems is the Hunter criteria. […] The Hunter criteria is the most recent system used and appears to be the most reliable in diagnosis of SS, but other systems utilized prior are still helpful in diagnosis. […] It is important that the APRN is aware of the different systems used to diagnose SS. […] None of the criteria systems can be relied upon exclusively and a thorough patient history is helpful if SS is suspected.

• #65 Anecdotal Failures in the Diagnosis of Serotonin Syndrome – The Hospitalist

  https://www.the-hospitalist.org/hospitalist/article/121406/anecdotal-failures-diagnosis-serotonin-syndrome/

  SS is a potentially life-threatening condition caused by serotonin excess in the central nervous system. […] Hospitalists cannot rely on any one set of criteria to diagnose SS. […] Hyperthermia and timing of onset are not good indicators to the diagnosis of SS. […] A high index of suspicion rather than reliance on classification systems or anecdotal key symptoms is necessary when considering SS.

• #66 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Serotonin syndrome is a diagnosis of exclusion. No single diagnostic test can confirm this syndrome. The diagnostic gold standard for serotonin syndrome is diagnosis by a medical toxicologist. In a clinical setting, however, the suspicion of serotonin syndrome and diagnosis must occur rapidly so treatment can prevent the morbidity and mortality associated with this condition. Therefore, a diagnosis of serotonin syndrome is entirely clinical and is based on the history and physical examination along with history of the patient’s use of a serotonergic drug. Important components of the history include prescription drug use, over-the-counter medication and dietary supplement use, illicit substance use, any recent changes in dosing, or the addition of new drugs to a drug regimen. The onset and description of symptoms and the presence of any comorbidities are of utmost importance. Certain comorbidities, such as depression and chronic pain, may alert the clinician to the use of drugs that can precipitate serotonin syndrome. Also, a higher incidence of serotonin syndrome has been reported in patients with end-stage renal disease who are on selective serotonin reuptake inhibitors (SSRIs) and hemodialysis. These patients are prone to developing serotonin toxicity, suggesting that this increased toxicity could be related to a decrease in renal functioning. An integral part of the physical examination for diagnosing serotonin syndrome is the neurological examination. […]

• #67

• #68 Serotonin syndrome: a rare undiagnosed cause of hyperpyrexia | The Egyptian Journal of Internal Medicine | Full Text

  https://ejim.springeropen.com/articles/10.1186/s43162-023-00223-2

  There is no specific test for serotonin syndrome and measurement of serotonin levels has not been shown to be helpful. […] Early diagnosis of mild serotonin syndrome prevents the development of severe life-threatening serotonin syndrome so it is suggested that every patient on the serotonergic drug should be examined for the presence of hyperreflexia, tremor, and clonus.

• #69 Serotonin Syndrome: What It Is, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17687-serotonin-syndrome

  Serotonin syndrome is a potentially life-threatening drug reaction that results from having too much serotonin in your body. […] Your healthcare provider usually makes the diagnosis based on the results of your physical exam, review of your symptoms and history of medications you take that affect serotonin levels. […] There arent any tests to diagnose serotonin symptoms. […] If your symptoms are mild, stopping the medication or changing your dose usually makes symptoms go away within 24 to 72 hours. […] If your case of serotonin syndrome was caused by an antidepressant, it may take several weeks for the medication to clear your body and for your symptoms to completely go away. […] If you have symptoms (or worsening symptoms) of serotonin syndrome, call your healthcare provider right away or go to an emergency room.

• #70 Serotonin Syndrome

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3865832/

  Several diagnostic criteria have been proposed for serotonin syndrome. The most recent diagnostic criteria are the Hunter Serotonin Toxicity Criteria (HSTC) that have replaced the older Sternbach Criteria in an attempt to simplify the diagnosis. When compared to the gold standard of diagnosis by a medical toxicologist, the HSTC are more sensitive (84% versus 75%) and specific (97% versus 96%) than the Sternbach criteria. The HSTC include the use of a serotonergic agent plus 1 of the 5 following criteria: spontaneous clonus, inducible clonus plus agitation or diaphoresis, ocular clonus plus agitation or diaphoresis, tremor and hyperreflexia, hypertonia and a temperature above 38C plus ocular or inducible clonus. Clonus and hyperreflexia are most important for the diagnosis; however, severe muscle rigidity may mask these symptoms. Prominent features of life-threatening cases include hyperthermia (38.5C), peripheral hypertonicity, and truncal rigidity because of the high risk of progression to respiratory failure. Some nonspecific laboratory abnormalities may be seen in serotonin syndrome: leukocytosis, low bicarbonate level, elevated creatinine level, and elevated transaminases. Serum serotonin concentrations do not correlate with the severity of this syndrome. […]

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