Materiały źródłowe

• #1 Medium-chain acyl-coenzyme A dehydrogenase deficiency – Wikipedia

  https://en.wikipedia.org/wiki/Medium-chain_acyl-coenzyme_A_dehydrogenase_deficiency

  Medium-chain acyl-CoA dehydrogenase deficiency (MCAD deficiency or MCADD) is a disorder of fatty acid oxidation that impairs the body’s ability to break down medium-chain fatty acids into acetyl-CoA. The disorder is characterized by hypoglycemia and sudden death without timely intervention, most often brought on by periods of fasting or vomiting. […] MCADD presents in early childhood with hypoketotic hypoglycemia and liver dysfunction, often preceded by extended periods of fasting or an infection with vomiting. Infants who are exclusively breast-fed may present in this manner shortly after birth, due to poor feeding. In some individuals the first manifestation of MCADD may be sudden death following a minor illness. […] Clinically, MCADD or another fatty acid oxidation disorder is suspected in individuals who present with lethargy, seizures, coma and hypoketotic hypoglycemia, particularly if triggered by a minor illness. MCADD can also present with acute liver disease and hepatomegaly, which can lead to a misdiagnosis of Reye syndrome. In some individuals, the only manifestation of MCADD is sudden, unexplained death often preceded by a minor illness that would not usually be fatal.

• #1 MCAD deficiency – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/mcad-deficiency/symptoms-causes/syc-20353745

  MCAD deficiency is usually first identified in babies and young children. In rare cases, the disorder is not diagnosed until adulthood. […] Symptoms can vary among people with MCAD deficiency. They may include: Vomiting. Low or no energy. Weak feeling. Low blood sugar. […] A sudden severe episode, called a metabolic crisis, can be due to: Going too long without eating. Missing meals. Common infections. High fever. Ongoing stomach and digestive problems that may cause vomiting and diarrhea. Intense exercise. […] If left untreated, MCAD deficiency may lead to severe lack of energy and tiredness, liver disease, coma, and other serious health problems. Also, the level of sugar in your blood can drop dangerously low a condition called hypoglycemia. […] When you don’t have enough of the MCAD enzyme in your body, certain fats called medium-chain fatty acids can’t be broken down and turned into energy. This leads to low energy and low blood sugar. Also, fatty acids can build up in body tissues and cause damage.

• #1 Medium Chain Acyl-CoA Dehydrogenase Deficiency (MCAD) | Revvity

  https://www.revvity.com/disorders/medium-chain-acyl-coa-dehydrogenase-deficiency-mcad

  MCAD deficiency generally presents between the second month and the second year of life, although onset as early as two days and as late as adulthood has been reported. […] Symptoms include vomiting, lethargy, apnea, coma, cardiopulmonary arrest, or sudden unexplained death. […] Initial symptoms often precede the onset of profound hypoglycemia, and are probably related to high free fatty acid levels. […] Physical examination of the acutely ill child is remarkable for mild to moderate hepatomegaly, and some patients may also have demonstrable muscle weakness. […] Without prior indication of metabolic disease, 20–25 percent of patients with this disease will die with their first episode of illness. […] Cerebral edema, and fatty liver, heart, and kidneys are noted at autopsy, often leading to a misdiagnosis of Reye’s syndrome or Sudden Infant Death Syndrome (SIDS). This disorder accounts for about one percent of SIDS deaths.

• #1 MCAD Deficiency: Symptoms, Treatment, Life Expectancy

  https://www.verywellhealth.com/mcad-overview-4175022

  Medium chain acyl-coenzyme A dehydrogenase deficiency (MCAD deficiency) is a rare and potentially serious inherited condition that affects the body’s ability to convert a certain fat into energy. Symptoms like vomiting and trouble breathing can develop soon after birth and turn deadly if left untreated. […] Symptoms of MCAD deficiency usually start early in life and generally appear soon after a child has gone for a long stretch without eating. With prolonged fasting, children with MCAD deficiency experience sudden hypoglycemia (low blood sugar) and liver dysfunction. […] Symptoms of MCAD deficiency typically start between the ages of 1 month and 2 years and many include: Lethargy, Weakness, Sleepiness, Floppiness (poor muscle tone), Trouble breathing, Rapid breathing, Shakiness, Pale skin, Sweating, Irritability, Swollen tummy (due to an enlarged liver), Vomiting.

• #1 Medium-Chain Acyl-Coenzyme A Dehydrogenase Deficiency – GeneReviews® – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK1424/

  Individuals with medium-chain acyl-coenzyme A dehydrogenase (MCAD) deficiency typically appear normal at birth, and many are diagnosed through newborn screening programs. Symptomatic individuals experience hypoketotic hypoglycemia in response to either prolonged fasting (e.g., weaning the infant from nighttime feedings) or during intercurrent and common infections (e.g., viral gastrointestinal or upper respiratory tract infections), which typically cause loss of appetite and increased energy requirements when fever is present. […] Untreated severe hypoglycemic episodes can be accompanied by seizures, vomiting, lethargy, coma, and death. Metabolic decompensation during these episodes can result in elevated liver transaminases and hyperammonemia. Individuals with MCAD deficiency who have experienced the effects of uncontrolled metabolic decompensation are also at risk for chronic myopathy. Early identification and avoidance of prolonged fasting can ameliorate these findings. However, children with MCAD deficiency are at risk for obesity after initiation of treatment due to the frequency of feeding.

• #1 An Educator’s Guide to MCADD — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/an-educators-guide-to-mcadd

  Children with MCADD usually have symptoms for the first time between three months and two years of age. These symptoms are often brought on when a child stops eating, usually because of a common illness such as the flu, an ear infection, or a cold. […] MCADD can cause a metabolic crisis. A metabolic crisis may start with symptoms of fever, diarrhea, and vomiting. This is usually followed by low blood sugar. If a metabolic crisis is not treated, it can lead to breathing problems, coma, or death. Prompt treatment can prevent these consequences. […] If children with MCADD go too long without food, low blood sugar (hypoglycemia) can occur, with or without other symptoms of a metabolic crisis. Low blood sugar can cause weakness, shakiness, dizziness, or cold, clammy skin. […] Symptoms often occur after a child has nothing to eat for more than a few hours. During long periods without eating food, the glucose in the body is used up. Some of the first symptoms include: Sleepiness, Behavior changes, Irritable mood, Poor appetite, Low Energy, Fatigue, Vomiting.

• #1 Medium-Chain Acyl-CoA Dehydrogenase Deficiency – MD Searchlight

  https://mdsearchlight.com/genetic-disorders/medium-chain-acyl-coa-dehydrogenase-deficiency/

  Some babies with MCADD might show symptoms of a fast, irregular heartbeat caused by a buildup of medium-chain acylcarnitines. There have also been reports of an irregular heartbeat coming from the upper chambers of the heart. Also, MCADD can be associated with sudden and unexplained death in infants. Some reports suggest that MCADD could be a factor in up to 1% of all such cases. Autopsies of patients who died suddenly from MCADD often show brain swelling and fatty infiltration in the liver, heart, and kidneys. […] Because different genetic mutations can cause MCADD, some patients might only have a modest reduction in MCAD activity and may not show symptoms until adulthood. Adults usually show symptoms during periods of severe catabolic stress, which can be life-threatening. Adults with symptomatic MCADD often report drinking alcohol followed by vomiting. Unlike younger patients, adults are more likely to show symptoms related to the heart. This likely happens because undiagnosed adults have medium-chain fatty acids accumulating in their heart muscle cells for many years during childhood and adolescence.

• #1 MCAD Deficiency: Symptoms, Treatment, Life Expectancy

  https://www.verywellhealth.com/mcad-overview-4175022

  If MCAD deficiency isn’t treated, these symptoms can get progressively worse and lead to an „MCAD crisis.” This is a potentially life-threatening situation characterized by severe vomiting, seizures, disorientation, coma, and even death. […] According to the National Organization for Rare Disorders, MCAD deficiency is a known cause of sudden infant death syndrome (SIDS). […] If MCAD deficiency is properly managed, a person can live a long and healthy life. However, if left undiagnosed and untreated, the risk of death is estimated to be around 20%. Most deaths occur during early childhood.

• #1 Medium Chain Acyl-CoA Dehydrogenase Deficiency (MCADD) — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/mcadd

  NOTE that in the acute crises patients can be seriously ill WITHOUT hypoglycemia although typically FAOD crises are associated with hypoglycemia. At these times the urine typically tests absent or small for the presence of ketones. Liver function tests may be mildly elevated; hyperammonemia and hyperuricemia are often present during acute episodes.

• #1 MCAD deficiency // Middlesex Health

  https://middlesexhealth.org/learning-center/diseases-and-conditions/mcad-deficiency

  MCAD deficiency is usually first identified in babies and young children. In rare cases, the disorder is not diagnosed until adulthood. […] Symptoms can vary among people with MCAD deficiency. They may include: Vomiting. Low or no energy. Weak feeling. Low blood sugar. […] A sudden severe episode, called a metabolic crisis, can be due to: Going too long without eating. Missing meals. Common infections. High fever. Ongoing stomach and digestive problems that may cause vomiting and diarrhea. Intense exercise. […] If metabolic crisis caused by MCAD deficiency is left untreated, it can lead to: Seizures. Liver problems. Brain damage. Coma. Sudden death.

• #1 Medium-Chain Acyl-Coenzyme A Dehydrogenase Deficiency – GeneReviews® – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK1424/

  Hypoglycemic episodes can be accompanied by seizures. […] Such instances of metabolic stress lead to vomiting and lethargy, which may quickly progress to coma and death. […] Hepatomegaly can arise during an acute decompensation, which is also characterized by hypoketotic hypoglycemia, elevated liver transaminases, and hyperammonemia. […] Sudden and unexpected death was historically common as the first manifestation of MCAD deficiency and still can occur as late as adulthood (e.g., precipitated by times of increased metabolic stress such as surgery or prolonged fasting). […] The presence of low levels of ketones on urinalysis, urine organic acids, or serum beta-hydroxybutyrate analysis should not be taken as evidence against MCAD deficiency („hypoketotic” as compared to nonketotic), as ketones can be present during times of acute metabolic decompensation due to long-chain fatty acid oxidation.

• #1 Medium-Chain Acyl-Coenzyme A Dehydrogenase Deficiency – GeneReviews® – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK1424/

  Individuals with MCAD deficiency typically have no neurologic disease. However, individuals who have experienced the effects of an uncontrolled metabolic decompensation are at risk of losing developmental milestones and acquiring aphasia and attention-deficit/hyperactivity disorder, which are thought to be secondary to brain injury sustained during the acute metabolic event. […] Individuals with MCAD deficiency who have experienced the effects of uncontrolled metabolic decompensation are also at risk for chronic myopathy, as observed in 18% of individuals who had several episodes of metabolic decompensation.

• #1 RFTS – Home Page

  https://www.wvdhhr.org/nbms/diseases/Medium_Chain_Acyl_CoA_Dehydrogenase.asp

  Although death is certainly the most important potential outcome of not screening for MCAD deficiency, there are findings in survivors that are very concerning regarding morbidity. A follow-up survey of 78 MCAD-deficiency survivors (all older than 2 years) revealed a number of unexpected problems, including developmental disabilities, speech and language delay, behavioral problems, attention-deficit/hyperactivity disorder (ADHD), proximal muscle weakness, chronic seizure disorder, cerebral palsy, and failure to thrive. The finding of ADHD was seen in 9 patients (12%), 8 of whom were female, in contrast to the usual male preponderance of ADHD in the general population. The development of muscle weakness was strongly correlated with length of time between symptomatic presentation and the institution of appropriate measures to prevent additional episodes of illness.

• #1

  https://link.springer.com/article/10.1007/s00431-022-04421-y

  In all patients, lethal metabolic decompensation occurred before NBS results could be reported or even before NBS sample was taken. […] However, none of these patients had received a post-mortem autopsy. […] The remaining newborns had no evidence of concomitant diseases so that MCAD deficiency was most likely the exclusive and preventable cause of death. […] Nevertheless, poor feeding, enhancing postnatal catabolism, which may cause metabolic decompensation, was reported in 80% of the patients with reliable nutritional information. […] Thus, homozygosity for c.985 AG is a major risk factor for neonatal death in MCAD patients. […] To prevent early deaths in neonates with unidentified MCAD deficiency, the following aspects have to be considered: […] Prevention and/or early treatment of neonatal hypoglycemia is of utmost importance to avoid neonatal metabolic decompensation.

• #1 Genotypic differences of MCAD deficiency in the Asian population: Novel genotype and clinical symptoms preceding newborn screening notification | Genetics in Medicine

  https://www.nature.com/articles/gim200568

  Purpose: In contrast to its high prevalence in Caucasians, medium-chain acyl-CoA dehydrogenase (MCAD) deficiency is reported to be an extremely rare metabolic disorder in the Asian population. […] The patient became symptomatic before notification of the abnormal NBS result. […] The present infant is the first patient of Korean descent identified with MCAD deficiency diagnosed by NBS and confirmed by positive biochemical and molecular genetic analyses. Of note, the patient’s clinical course was remarkable for an episode of metabolic decompensation at the 5th day of life before notification of an abnormal NBS result. […] Interestingly, the father and the 4-year-old brother of the patient who are carriers for the 4-bp deletion showed slight elevations of plasma C8 and/or C10:1 carnitines, whereas the mother who carries the novel missense mutation had an entirely normal acylcarnitine profile. This suggests that the degree of functional impact of a mutation on MCAD activity may be reflected on the metabolite level, and thus, some carriers of more deleterious mutations may show an abnormal plasma acylcarnitine profile. […] Greater availability of MCAD genotyping is likely to facilitate the evaluation of cases with milder metabolite profiles that are not typical but suggestive of a possible biochemical diagnosis of MCAD deficiency.

• #1 MCAD deficiency | Encyclopedia.com

  https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/mcad-deficiency-0

  Approximately half of all individuals showing symptoms of MCAD deficiency for the first time experience respiratory arrest, cardiac arrest, and/or sudden infant death. Between 20% and 25% of all MCAD deficiency affected infants die during their first episodes of symptoms. […] Some individuals affected with MCAD deficiency also are affected with a degenerative disease of the brain and central nervous system (encephalopathy). Seizures, coma, and periods of halted breathing (apnea) have also been seen in people with MCAD deficiencies. […] Long-term symptoms of MCAD deficiency may include: attention deficit disorder (ADD), cerebral palsy, mental retardation, and/or developmental delays. […] The severity of the symptoms associated this MCAD deficiency is linked to the age of the person when the symptoms first happen. The risk of dying from an onset of the disease is slightly higher in individuals who show the first symptoms after the age of one year. The highest risk ages are the ages of 15 to 26 months. Seizures and encephalopathy are most frequently seen in affected individuals between the ages of 12 and 18 months. Seizures at these ages are often associated with future death during a symptomatic episode, recurrent seizures throughout life, the development of cerebral palsy, and/or the development of speech disabilities.

• #1

  https://link.springer.com/article/10.1007/s00431-022-04421-y

  Medium-chain acyl-coenzyme A dehydrogenase (MCAD) deficiency is the most common disorder of mitochondrial -oxidation of fatty acids resulting in hypoketotic hypoglycemia, hepatopathy, and often fatal outcome in undiagnosed children. […] However, neonatal death in individuals with early disease manifestation and severe hypoglycemia may still occur. […] Early newborn screening and awareness for clinical symptoms is lifesaving in MCAD deficiency, which may present with fatal neonatal crisis. […] Poor feeding, no monitoring of blood glucose, and homozygosity of the common gene variant (c.985AG) are major risk factors for fatal neonatal crisis in MCAD deficiency. […] Fatal episodes of severe hyperglycemia triggered by postnatal catabolism can still occur in the first hours and days of life.

• #1 Medium-chain Acyl-CoA Dehydrogenase (MCAD) Deficiency | Children’s Hospital of Philadelphia

  https://www.chop.edu/conditions-diseases/medium-chain-acyl-coa-dehydrogenase-mcad-deficiency

  Symptoms of MCAD deficiency can range from mild to severe. On the mild end, some individuals with MCAD deficiency may only have slight exercise intolerance. Children with more severe MCAD deficiency can have significant physical and intellectual disabilities. Severe MCAD deficiency usually appears in infancy. […] Symptoms of MCAD deficiency include: Low or no energy, Low blood sugar (hypoglycemia), Muscle weakness and reduced exercise tolerance, Vomiting. […] Because infants do not have significant energy storage in their bodies yet, those with MCAD deficiency can quickly become extremely sick (decompensate). […] If left untreated or not treated promptly and properly, MCAD deficiency can lead to brain injury, developmental delays, attention-deficit disorder, muscle weakness, reduced exercise tolerance, irregular heartbeats (cardiac arrhythmia), low blood sugar (hypoglycemia), liver disease, kidney disease and, in rare cases, sudden and unexpected death.

• #1 MCADD

  https://www.nhs.uk/conditions/mcadd/

  MCADD is a potentially serious condition that can be life-threatening if not recognised quickly and treated appropriately. […] Babies with MCADD are at risk of developing the following symptoms: irritability, poor feeding, sleepiness, floppiness, breathing difficulties, vomiting, seizures (fits), coma. […] If your baby is ill or is not feeding well, they should be given a special high-sugar drink, known as glucose polymer. […] If you see no improvement after giving the emergency regimen, you should take your child to your nearest AE department immediately. […] This can lead to serious problems if not treated quickly.

• #1 Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency | New York State Department of Health, Wadsworth Center

  https://www.wadsworth.org/public-health-programs/newborn-screening/newborn-screening-program/medium-chain-acyl-coa-dehydrogenase-mcad-deficiency

  Newborns may not show any symptoms, but left untreated, the disorder can cause hypoglycemia, lethargy, liver disease, vomiting, seizures, coma and sudden death. […] MCAD deficiency is caused by mutations in the ACADM gene. Individuals with this disorder are unable to convert certain fats to energy and may have symptoms during times of high energy need such as when fasting or ill.

• #1 MCADD (medium chain acyl-CoA dehydrogenase deficiency) – newbornscreening.info

  https://www.newbornscreening.info/mcadd-medium-chain-acyl-coa-dehydrogenase-deficiency/

  MCADD can cause bouts of illness called metabolic crises. […] Children with MCADD often show effects for the first time between three months and three years of age. […] Some of the first symptoms of a metabolic crisis are poor appetite, nausea, vomiting, diarrhea, extreme sleepiness, irritable mood and behavior changes. […] If not treated, breathing problems, seizures, coma, and sometimes even death can occur. […] Between episodes of metabolic crisis, people with MCADD are usually healthy. However, repeated episodes can cause permanent brain damage. […] Symptoms often happen after having nothing to eat for more than a few hours. […] Hypoglycemia can occur, with or without other symptoms of metabolic crisis, just by going too long without food. […] Some children with MCADD have very mild symptoms or no symptoms at all. […] With prompt and careful treatment, children with MCADD usually live healthy lives with typical growth and development. […] However, children who have repeated metabolic crises may have life-long learning disabilities, spasticity, chronic muscle weakness, or other effects.

• #1 Medium-Chain acyl-CoA Dehydrogenase Deficiency (MCAD) – Florida Newborn Screening

  https://floridanewbornscreening.com/condition/medium-chain-acyl-coa-dehydrogenase-deficiency-mcad/

  Medium-chain acyl-CoA dehydrogenase deficiency (MCAD) is a condition in which the body is unable to break down certain fats. Individuals affected with MCAD are unable to convert some of the fats they eat into energy the body needs to function. Instead, too many unused fatty acids build up in the body. If untreated, MCAD can cause brain damage and breathing problems. The first signs of MCAD usually begin during infancy or 3 months to 3 years of age. Signs of MCAD include sleeping longer or more often, tiredness, irritability, poor appetite, fever, diarrhea, vomiting, and low blood sugar (hypoglycemia). Many of these signs may occur when a baby eats foods the body cannot break down. Symptoms can be triggered by long periods of time without eating, illnesses, and infections. […] However, if the condition is detected early and proper treatment is begun, individuals affected by MCAD can often lead healthy lives.

• #1 MCAD Deficiency Diagnosis and Treatment

  https://informnetwork.org/mcad-deficiency/

  In the United State today, this fatty oxidation disorder is typically identified in the first few days of life through newborn screening. This involves the collection of a blood spot from the infant’s heel that is used for special testing. Before newborn screening, children with this deficiency usually showed signs and symptoms of the condition, sometimes multiple times, during the first two years of life. […] These symptoms include: Vomiting, Enlarged liver (hepatomegaly), Low blood sugar, Low ketones (hypoketotic hypoglycemia), Lethargy (lack of sleep). […] In some cases, these episodes worsened over time, leading to coma or seizures after seemingly mild illnesses, such as a viral illness or ear infection. As they get older, children usually become less prone to serious episodes. A few individuals with MCAD deficiency who were born before newborn screening may have mild symptoms of the disorder in adolescence or adulthood.

• #1 Screening for medium-chain acyl CoA dehydrogenase deficiency: current | RRN

  https://www.dovepress.com/screening-for-medium-chain-acyl-coa-dehydrogenase-deficiency-current-p-peer-reviewed-fulltext-article-RRN

  Although not typical, the initial episode may occur in the first week of life, with symptoms ranging from hypoglycemia to coma and death. In the neonatal period, inadequate caloric intake due to difficulties with breastfeeding is considered to play a role in triggering metabolic crisis. Most patients with MCAD deficiency present after the neonatal period with the median age at the initial episode reported as 11.5 years. […] The calculated mortality rate was 20%30% for cases identified clinically, usually presenting with severe hypoglycemia during the first 2 years of life. […] Prior to wide use of NBS, approximately 40% of patients with MCAD deficiency who survive after diagnosis had abnormal developmental testing, including attention deficit, speech delay, and behavioral problems. […] Although NBS has proven effective particularly in the presymptomatic individuals, severe metabolic crisis and sudden death have not been entirely prevented.

• #1 Trait Document | My46

  https://www.my46.org/trait-document?trait=Medium-chain%20acyl-CoA%20dehydrogenase%20deficiency&parent=Carrier%20Status&type=profile

  Medium-chain acyl-coA dehydrogenase deficiency is a metabolic disorder that is characterized by the bodys inability to break down certain fats as a source of energy for the brain and other organs. Symptoms of MCAD deficiency often present when a child is in a fasting state, meaning when they are not eating. If a child with MCAD deficiency goes too long without eating, he/she often develop symptoms such as lethargy (tired and weak), vomiting, and sometimes seizures. […] If the fasting state continues, stress is put on the liver and the heart, and they may stop functioning properly. In rare cases, symptoms can progress to coma and death. These episodes of acute symptoms are called crises. […] If a person with MCAD deficiency has many crises early in life, they may develop lasting symptoms, such as delayed development, attention deficit disorder, and chronic muscle weakness. […] Though rare, adolescents and adults with MCAD deficiency can have life-threatening crises, and therefore, awareness and management is required throughout life.

• #1 Medium-Chain Acyl-CoA Dehydrogenase (MCAD) Deficiency (MCADD) Clinical Presentation: History, Physical, Causes

  https://emedicine.medscape.com/article/946755-clinical

  Because medium-chain acyl-CoA dehydrogenase (MCAD) deficiency is an autosomal recessive trait, other affected members of a family pedigree are unlikely to be historically available to assist in diagnosis. […] Historically, this need may correlate with increased preprandial irritability, lethargy, jitteriness, sweating, and, possibly, seizures, which are all symptomatic of hypoglycemia. […] Exaggerated lethargy accompanied by vomiting and acidosis with previous viral illness, often requiring intravenous fluid replacement therapy, is common. […] Although early development is usually normal, growth may be somewhat slow. Repeated episodes of metabolic decompensation may result in poor intellectual development. […] Upon acute presentation, the infant is likely to be tachypneic, somnolent, and have a mildly enlarged liver, which is due to fatty infiltration. Hepatomegaly is a cardinal feature of MCAD, as well as of other fatty acid oxidative disorders. […] The adult presentation may be characterized by headaches and vomiting, probably relating to hyperammonemia and to the cerebral metabolic effects of accumulated octanoate.

• #1 Merged Actionability Release – Clinical Genome Resources

  https://actionability.clinicalgenome.org/ac/Pediatric/ui/stg2SummaryRpt?doc=AC1016

  Children with MCAD deficiency appear normal at birth and, if not identified through newborn screening, typically have the first acute episode between age 3 and 24 months, although presentation as late as adulthood is possible. Late-onset presentations have been described in adults after prolonged fasting, including after fasting for surgery, or with alcohol intoxication, often with fatal results. Infants and young children with MCAD deficiency are at a greater risk of metabolic decompensation than older children and adults. Prognosis in infants and young children is excellent once the diagnosis is established and frequent feedings are instituted to avoid prolonged periods of fasting. MCAD deficiency can manifest with sudden and unexpected death, even as late as in adulthood. […] If the diagnosis of MCAD deficiency has not been previously established, at least 18% and up to 25% of affected individuals die during their first metabolic crisis. […] Sudden and unexpected death can be the first manifestation and may occur as late as adulthood.

• #1 MCAD deficiency | Encyclopedia.com

  https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/mcad-deficiency-0

  Individuals affected with MCAD deficiency produce a form of the MCAD enzyme that is not nearly as efficient as the normal form of MCAD. This lack of efficiency results in a greatly diminished, but still functional, capability to break down medium chain fatty acids. […] The severity of symptoms observed in individuals affected with MCAD deficiency ranges from no symptoms at all (asymptomatic) to the occurrence of death upon the first onset of symptoms. The first symptoms of MCAD deficiency generally occur within the first three years of life. The average age of onset of the first symptoms is one year of age. Some individuals become symptomatic prior to birth. The onset of symptoms in adults is extremely rare. […] Lethargy and persistent vomiting are the most typical symptoms of MCAD deficiency. The first episode of symptoms is generally preceded by a 12 to 16 hour period of stress. Most affected individuals show intermittent periods of low blood sugar (hypoglycemia) and higher than normal amounts of ammonia in the blood (hyperammonemia). An abnormally large liver (hepatomegaly) is also associated with MCAD deficiency.

• #1 MCAD Deficiency: Symptoms, Causes, Treatment | Qwark

  https://qwarkhealth.com/conditions/mcad-deficiency?srsltid=AfmBOor-OZgpCNXC11D3cDNP0bYcKh77vG1VdW7MUEEw2K7LVdO9QWvj

  MCAD deficiency symptoms can range from mild to severe, with the most common symptoms being vomiting, low blood sugar, and lethargy. […] The common symptoms of MCAD (medium-chain acyl-CoA dehydrogenase) deficiency include vomiting, lethargy, hypoglycemia, seizures, coma, and even sudden death. These symptoms usually occur in response to fasting or the body`s increased energy demands, such as during periods of illness or extended physical exertion. […] There are differing degrees of severity in MCAD deficiency symptoms, ranging from mild to severe. In mild cases, symptoms may only occur during periods of fasting or illness, while individuals with severe MCAD deficiency may experience symptoms more frequently and even have difficulty gaining weight. However, the severity of symptoms is not always correlated with the level of enzyme deficiency present. Some individuals with only partial enzyme deficiency may experience severe symptoms, while others with near-complete deficiency may be asymptomatic.

• #1 Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency

  https://www.health.wa.gov.au/Articles/U_Z/WA-Newborn-Bloodspot-Screening-Program/Conditions-screened-for-in-WA/MCAD-deficiency

  MCAD deficiency typically causes problems in infancy or early childhood. The children are usually well until they develop another illness such as gastroenteritis, which stops them from feeding. They then develop hypoglycaemia associated with lethargy, hepatomegaly, seizures, coma and death. About 1 in 4 children with MCAD deficiency will die from their first crisis so it is important to diagnose and treat these children early. […] Some children may never have symptoms.

• #1 MCAD Deficiency: Symptoms, Causes and Treatment

  https://www.medicoverhospitals.in/diseases/mcad-deficiency/

  The symptoms of MCAD deficiency can vary significantly among individuals but often appear in infancy or early childhood. Common manifestations include: […] Hypoglycemia: Low blood sugar levels due to impaired fatty acid oxidation, especially during fasting or illness. […] Lethargy and Fatigue: Energy depletion can lead to persistent tiredness and a lack of energy. […] Vomiting: Recurrent episodes, particularly during illness or fasting. […] Seizures: Resulting from hypoglycemia or metabolic stress. […] Hepatomegaly: Enlarged liver due to fat accumulation. […] Sudden Death: In severe cases, undiagnosed MCAD deficiency can lead to sudden death, often triggered by fasting or illness. […] The underlying issue in MCAD deficiency is the body’s inability to efficiently perform fatty acid oxidation. This process is crucial for energy production, mainly when glucose levels are low, such as during fasting or prolonged exercise. The lack of energy production can lead to the symptoms mentioned above, making it vital to understand and manage this condition effectively.

• #1 The epidemiology of medium chain acyl-CoA dehydrogenase deficiency: An update | Genetics in Medicine

  https://www.nature.com/articles/gim200638

  The frequency of deaths among older siblings of children with MCADD seems elevated relative to that among probands. […] The reduced ability to metabolize medium-chain fatty acids becomes problematic when individuals are faced with extra metabolic demands or reduced dietary inputs. Most often, stress induced by fasting or infection, during which the demands on fatty acid oxidation are particularly high, leads to symptomatic presentation. […] Information on long-term outcomes in children with MCADD detected through newborn screening is still lacking. […] Newborn screening for MCADD clearly prevents death and disability in many children with the disorder. […] Without early asymptomatic detection, at least half of children with MCADD will experience a metabolic crisis, and up to 1 in 10 survivors will develop a serious developmental disability.

• #1 Medium-Chain Acyl-CoA Dehydrogenase Deficiency – MD Searchlight

  https://mdsearchlight.com/genetic-disorders/medium-chain-acyl-coa-dehydrogenase-deficiency/

  Patients diagnosed early with MCADD (Medium-chain acyl-CoA dehydrogenase deficiency, a rare genetic disorder that affects how the body processes fat to produce energy) and given proper care during sudden illnesses have an excellent chance of recovery. Early diagnosis through newborn screening (NBS) and follow-up care provided by centers specializing in metabolic disorders have reduced the disease’s health complications and death rates to nearly zero. Without a diagnosis, children have a mortality rate as high as 25% after experiencing the first symptoms. Moreover, many survivors can develop severe problems with brain function after this initial episode. […] One of the main concerns with this disease is that it can lead to problems with brain function, such as learning difficulties, speech problems, and attention deficit disorder. Research shows that when a person has a more severe form of the disease, it often goes hand in hand with these cognitive difficulties. To lessen this complication, it’s crucial to avoid going long periods without eating and to manage symptoms during illnesses.

• #1 Medium-chain acyl-coenzyme A dehydrogenase deficiency – Wikipedia

  https://en.wikipedia.org/wiki/Medium-chain_acyl-coenzyme_A_dehydrogenase_deficiency

  As with most other fatty acid oxidation disorders, individuals with MCADD need to avoid fasting for prolonged periods of time. During illnesses, they require careful management to stave off metabolic decompensation, which can result in death. […] A 1994 study of the entire population of New South Wales (Australia) found 20 patients. Of these, 5 (25%) had died at or before 30 months of age. Of the survivors, 1 (5%) was severely disabled and the remainder had either suffered mild disability or were making normal progress in school. A 2006 Dutch study followed 155 cases and found that 27 individuals (17%) had died at an early age. Of the survivors, 24 (19%) suffered from some degree of disability, of which most were mild. All the 18 patients diagnosed neonatally were alive at the time of the follow-up.

• #1 Medium-Chain acyl-CoA Dehydrogenase Deficiency (MCAD) | Condition | Unity Screen

  https://www.unityscreen.com/conditions/medium-chain-acyl-coa-dehydrogenase-deficiency

  Impairs the bodys ability to break down medium-chain fats for energy, leading to hypoglycemia and other complications. Early diagnosis and dietary management prevent severe symptoms. […] People with MCAD can experience low blood sugar, vomiting, tiredness, and muscle weakness, especially during long periods without food. If the condition is not treated, it can be life threatening. Untreated individuals can experience seizures, brain damage, and coma. […] Symptoms of MCAD usually appear in infancy or early childhood. With early diagnosis and proper management, individuals with MCAD can live a healthy life with a normal life expectancy. […] Yes, if not properly managed, MCAD can lead to serious complications, including brain damage or death. However, with early diagnosis and appropriate care, individuals can live healthy lives.

• #1 Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency

  https://www.wadsworth.org/node/2638/printable/print

  Newborns may not show any symptoms, but left untreated, the disorder can cause hypoglycemia, lethargy, liver disease, vomiting, seizures, coma and sudden death. […] The best results occur in those individuals identified by newborn screening and treated shortly after birth. The prognosis is excellent in patients who avoid fasting and seek additional treatment during times of illness.

• #1 Acyl-coa dehydrogenase, medium-chain, deficiency of – ThinkGenetic Foundation

  https://thinkgenetic.org/diseases/acyl-coa-dehydrogenase-medium-chain-deficiency-of/

  Common symptoms include vomiting, nausea, diarrhea, and very low energy levels so that infants are very sleepy or hard to wake up. […] As long as MCAD deficiency is properly diagnosed (as with newborn screening programs) and treated by frequent feedings to avoid long periods without food (fasting), the prognosis of the disorder is excellent and most people with have normal lifespans. […] Children with medium-chain acyl-coenzyme A dehydrogenase (MCAD) deficiency can develop symptoms when they go for a period of time without eating. […] Most children with medium-chain acyl-CoA dehydrogenase (MCAD) deficiency are diagnosed through newborn screening. This allows prompt treatment that prevents the signs and symptoms of the disorder. Consequently, most children with this disorder do not experience learning disabilities or problems. However, if a child is not diagnosed through newborn screening and goes undiagnosed until there is an episode of metabolic crisis, damage to the brain is possible. […] With prompt diagnosis and treatment, children with medium-chain acyl-CoA dehydrogenase (MCAD) deficiency can avoid the symptoms associated with this disorder and experience normal development. Their life expectancy will most likely be no different from someone without the disorder.

• #2 MCAD deficiency | Beacon Health System

  https://www.beaconhealthsystem.org/library/diseases-and-conditions/mcad-deficiency?content_id=CON-20193216

  MCAD deficiency is usually first identified in babies and young children. In rare cases, the disorder is not diagnosed until adulthood. […] Symptoms can vary among people with MCAD deficiency. They may include: Vomiting. Low or no energy. Weak feeling. Low blood sugar. […] A sudden severe episode, called a metabolic crisis, can be due to: Going too long without eating. Missing meals. Common infections. High fever. Ongoing stomach and digestive problems that may cause vomiting and diarrhea. Intense exercise. […] If left untreated, MCAD deficiency may lead to severe lack of energy and tiredness, liver disease, coma, and other serious health problems. Also, the level of sugar in your blood can drop dangerously low a condition called hypoglycemia. […] When you don’t have enough of the MCAD enzyme in your body, certain fats called medium-chain fatty acids can’t be broken down and turned into energy. This leads to low energy and low blood sugar. […] If metabolic crisis caused by MCAD deficiency is left untreated, it can lead to: Seizures. Liver problems. Brain damage. Coma. Sudden death.

• #2 MCAD Deficiency

  https://my.clevelandclinic.org/health/diseases/21973-mcad-deficiency

  MCAD deficiency is a genetic condition when your body can’t convert certain fats into energy. Symptoms trigger after long periods of time when you go without eating (fasting). Symptoms include feeling tired, nauseated and having low blood sugar. […] Symptoms of MCAD deficiency normally appear during early infancy and childhood and can be triggered during an illness when your child loses their appetite or undergoes long periods of time without eating. Symptoms of MCAD deficiency include: Low blood sugar (hypoglycemia). Vomiting. Low energy (lethargy). Muscle weakness. Serious side effects of MCAD deficiency include: Seizures. Difficulty breathing. Liver problems. Brain damage. Coma. […] Symptoms arise during long periods without eating. Scheduling meals more frequently throughout the day helps minimize symptoms of the condition. Eating complex carbohydrates like whole grains, some types of vegetables and beans before bedtime alleviates the need to wake up in the middle of the night to maintain steady glucose levels. […] An estimated 20% to 25% of babies who don’t receive an MCAD deficiency diagnosis after a newborn screening may experience long-term disability or early death if they dont receive proper treatment.

• #2 The epidemiology of medium chain acyl-CoA dehydrogenase deficiency: An update | Genetics in Medicine

  https://www.nature.com/articles/gim200638

  The age of presentation is variable. The majority of symptomatic cases present from 3 months to 3 years of age. […] The probability of an individual with MCADD detected by screening developing a metabolic decompensation crisis in the absence of screening is as high as 0.75. […] Death has been reported to occur in up to 25% of children with MCADD not previously diagnosed who experience episodes of acute metabolic decompensation. […] The overall mortality rate among all children with MCADD is necessarily lower than that among those who experience metabolic crises, because a fraction of individuals with the disorder do not manifest signs and symptoms in childhood. […] Children who experience acute metabolic decompensation are at elevated risk of neurologic impairment and varying degrees of disability. Up to one-third of survivors of metabolic crises in MCADD are reported to experience some form of developmental delay.

• #2 Orphanet: Medium chain acyl-CoA dehydrogenase deficiency

  https://www.orpha.net/en/disease/detail/42

  Medium chain acyl-CoA dehydrogenase (MCAD) deficiency (MCADD) is an inborn error of mitochondrial fatty acid oxidation characterized by a rapidly progressive metabolic crisis, often presenting as hypoketotic hypoglycemia, lethargy, vomiting, seizures and coma, which can be fatal in the absence of emergency medical intervention. […] MCADD usually presents 3 to 24 months after birth in previously healthy infants. However, neonatal presentations are well described as are those in adults, given sufficient metabolic stress (such as significant alcohol ingestion). Nevertheless, many affected individuals remain asymptomatic throughout life. Typically hypoketotic hypoglycemia, lethargy and vomiting are triggered by an infection, fasting or surgery. Some patients, however, can present with a progressive metabolic crisis despite ketosis and normal blood glucose. Rarely patients may present in crisis with ”paradoxically” gross ketosis. During a crisis, a patient may manifest with lethargy, emesis, respiratory arrest, seizures, hepatomegaly and rapid progression to cardiac arrest unless emergency treatment is implemented. Potential brain injury occurring during these episodes can lead to an increased risk of long term neurological damage. Sudden unexplained death can sometimes be the first manifestation of this disease. Historically, about 25% of undiagnosed patients die during their first presentation of a crisis. […] The prognosis is excellent in diagnosed patients who avoid fasting and who are managed appropriately during an intercurrent illness/ metabolic crisis.

• #2 MCAD Deficiency: Symptoms, Treatment, Life Expectancy

  https://www.verywellhealth.com/mcad-overview-4175022

  If MCAD deficiency isn’t treated, these symptoms can get progressively worse and lead to an „MCAD crisis.” This is a potentially life-threatening situation characterized by severe vomiting, seizures, disorientation, coma, and even death. […] According to the National Organization for Rare Disorders, MCAD deficiency is a known cause of sudden infant death syndrome (SIDS). […] If MCAD deficiency is properly managed, a person can live a long and healthy life. However, if left undiagnosed and untreated, the risk of death is estimated to be around 20%. Most deaths occur during early childhood.

• #2 Medium Chain Acyl-CoA Dehydrogenase Deficiency (MCADD) — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/mcadd

  Medium Chain Acyl-CoA Dehydrogenase Deficiency (MCADD) is the most frequent of the fatty acid oxidation disorders (FAOD) and one of the most frequently identified inborn errors of metabolism. The incidence of MCADD may be as high as 1/10,000 with mortality rates of 13-43% at initial crises. It is caused by an intramitochondrial defect in the – oxidation of fatty acids and is a major cause of hypoketotic hypoglycemia. MCADD is also a cause for lethargy, liver dysfunction with hepatomegaly, metabolic acidosis, hyperammonemia and sudden death. […] Affected infants and children usually present between 3 and 24 months of age particularly when being weaned from nighttime feeds but neonatal cases have been described and adults have become ill after severe exertion (e.g. jogging). The presentation is characterized by marked lethargy, often in association with vomiting after a period of fasting. This can progress to hypoglycemic seizures or coma within 1-2 hours of ONSET of symptoms. On occasion seizures or coma may be the presenting sign. Hepatomegaly is usually present. There may, or may not, be a history of a recent viral infection associated with diminished oral intake, or of a similar episode in the past. A history of recurrent Reye syndrome should alert you to the possibility of FAODs, as affected children have often been misdiagnosed as having Reye syndrome or episodic hypoglycemic coma; FAODs are responsible for 5-10% of sudden infant death syndrome. Immediate attention and therapy is the key to preventing sudden death.

• #2

  https://link.springer.com/article/10.1007/s00431-022-04421-y

  Medium-chain acyl-coenzyme A dehydrogenase (MCAD) deficiency is the most common disorder of mitochondrial -oxidation of fatty acids resulting in hypoketotic hypoglycemia, hepatopathy, and often fatal outcome in undiagnosed children. […] However, neonatal death in individuals with early disease manifestation and severe hypoglycemia may still occur. […] Early newborn screening and awareness for clinical symptoms is lifesaving in MCAD deficiency, which may present with fatal neonatal crisis. […] Poor feeding, no monitoring of blood glucose, and homozygosity of the common gene variant (c.985AG) are major risk factors for fatal neonatal crisis in MCAD deficiency. […] Fatal episodes of severe hyperglycemia triggered by postnatal catabolism can still occur in the first hours and days of life.

• #2 Medium-Chain Acyl-Coenzyme A Dehydrogenase Deficiency – GeneReviews® – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK1424/

  Individuals with medium-chain acyl-coenzyme A dehydrogenase (MCAD) deficiency typically appear normal at birth, and many are diagnosed through newborn screening programs. Symptomatic individuals experience hypoketotic hypoglycemia in response to either prolonged fasting (e.g., weaning the infant from nighttime feedings) or during intercurrent and common infections (e.g., viral gastrointestinal or upper respiratory tract infections), which typically cause loss of appetite and increased energy requirements when fever is present. […] Untreated severe hypoglycemic episodes can be accompanied by seizures, vomiting, lethargy, coma, and death. Metabolic decompensation during these episodes can result in elevated liver transaminases and hyperammonemia. Individuals with MCAD deficiency who have experienced the effects of uncontrolled metabolic decompensation are also at risk for chronic myopathy. Early identification and avoidance of prolonged fasting can ameliorate these findings. However, children with MCAD deficiency are at risk for obesity after initiation of treatment due to the frequency of feeding.

• #2 MCAD deficiency | Altru Health System

  https://www.altru.org/health-library/conditions/mcad-deficiency

  MCAD deficiency is usually first identified in babies and young children. In rare cases, the disorder is not diagnosed until adulthood. […] Symptoms can vary among people with MCAD deficiency. They may include: Vomiting. Low or no energy. Weak feeling. Low blood sugar. […] A sudden severe episode, called a metabolic crisis, can be due to: Going too long without eating. Missing meals. Common infections. High fever. Ongoing stomach and digestive problems that may cause vomiting and diarrhea. Intense exercise. […] If metabolic crisis caused by MCAD deficiency is left untreated, it can lead to: Seizures. Liver problems. Brain damage. Coma. Sudden death. […] Newborn screening at birth allows MCAD deficiency to be diagnosed and treated early, before symptoms occur, preventing complications. Once identified, the disorder can be managed through diet and lifestyle.

• #2 The epidemiology of medium chain acyl-CoA dehydrogenase deficiency: An update | Genetics in Medicine

  https://www.nature.com/articles/gim200638

  The most common fatty acid oxidation disorder, medium chain acyl-CoA dehydrogenase deficiency (MCADD), has become the focal point for the adoption of tandem mass spectrometry to detect it and related inborn errors of metabolism. […] It seems that in the absence of newborn screening for MCADD, premature death or serious disability occurs in 20% to 25% of children with the disorder. […] Despite the increase in screening, understanding of the natural history of unscreened MCADD remains limited. […] The major preventable outcomes of concern are death and intellectual disability. Death is reported to occur in up to 25% of symptomatic individuals with MCADD. […] The frequency of death in untreated MCADD is said to be as high as 50% or as low as 2%. […] Because fatty acid oxidation is important for energy production during fasting or increased energy expenditure, fasting or stress in individuals with MCADD can lead to a variety of complications. These include hypoketotic hypoglycemia, hypotonia, lethargy, and vomiting. This can progress to seizures, encephalopathy, coma, and death with an accumulation of toxic metabolites.

• #2 RFTS – Home Page

  https://www.wvdhhr.org/nbms/diseases/Medium_Chain_Acyl_CoA_Dehydrogenase.asp

  Although death is certainly the most important potential outcome of not screening for MCAD deficiency, there are findings in survivors that are very concerning regarding morbidity. A follow-up survey of 78 MCAD-deficiency survivors (all older than 2 years) revealed a number of unexpected problems, including developmental disabilities, speech and language delay, behavioral problems, attention-deficit/hyperactivity disorder (ADHD), proximal muscle weakness, chronic seizure disorder, cerebral palsy, and failure to thrive. The finding of ADHD was seen in 9 patients (12%), 8 of whom were female, in contrast to the usual male preponderance of ADHD in the general population. The development of muscle weakness was strongly correlated with length of time between symptomatic presentation and the institution of appropriate measures to prevent additional episodes of illness.

• #2 MCAD deficiency | Encyclopedia.com

  https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/mcad-deficiency-0

  Approximately half of all individuals showing symptoms of MCAD deficiency for the first time experience respiratory arrest, cardiac arrest, and/or sudden infant death. Between 20% and 25% of all MCAD deficiency affected infants die during their first episodes of symptoms. […] Some individuals affected with MCAD deficiency also are affected with a degenerative disease of the brain and central nervous system (encephalopathy). Seizures, coma, and periods of halted breathing (apnea) have also been seen in people with MCAD deficiencies. […] Long-term symptoms of MCAD deficiency may include: attention deficit disorder (ADD), cerebral palsy, mental retardation, and/or developmental delays. […] The severity of the symptoms associated this MCAD deficiency is linked to the age of the person when the symptoms first happen. The risk of dying from an onset of the disease is slightly higher in individuals who show the first symptoms after the age of one year. The highest risk ages are the ages of 15 to 26 months. Seizures and encephalopathy are most frequently seen in affected individuals between the ages of 12 and 18 months. Seizures at these ages are often associated with future death during a symptomatic episode, recurrent seizures throughout life, the development of cerebral palsy, and/or the development of speech disabilities.

• #2 Medium-Chain Acyl-CoA Dehydrogenase Deficiency – MD Searchlight

  https://mdsearchlight.com/genetic-disorders/medium-chain-acyl-coa-dehydrogenase-deficiency/

  Some babies with MCADD might show symptoms of a fast, irregular heartbeat caused by a buildup of medium-chain acylcarnitines. There have also been reports of an irregular heartbeat coming from the upper chambers of the heart. Also, MCADD can be associated with sudden and unexplained death in infants. Some reports suggest that MCADD could be a factor in up to 1% of all such cases. Autopsies of patients who died suddenly from MCADD often show brain swelling and fatty infiltration in the liver, heart, and kidneys. […] Because different genetic mutations can cause MCADD, some patients might only have a modest reduction in MCAD activity and may not show symptoms until adulthood. Adults usually show symptoms during periods of severe catabolic stress, which can be life-threatening. Adults with symptomatic MCADD often report drinking alcohol followed by vomiting. Unlike younger patients, adults are more likely to show symptoms related to the heart. This likely happens because undiagnosed adults have medium-chain fatty acids accumulating in their heart muscle cells for many years during childhood and adolescence.

• #2 MCAD Deficiency: Symptoms, Treatment, Life Expectancy

  https://www.verywellhealth.com/mcad-overview-4175022

  Medium chain acyl-coenzyme A dehydrogenase deficiency (MCAD deficiency) is a rare and potentially serious inherited condition that affects the body’s ability to convert a certain fat into energy. Symptoms like vomiting and trouble breathing can develop soon after birth and turn deadly if left untreated. […] Symptoms of MCAD deficiency usually start early in life and generally appear soon after a child has gone for a long stretch without eating. With prolonged fasting, children with MCAD deficiency experience sudden hypoglycemia (low blood sugar) and liver dysfunction. […] Symptoms of MCAD deficiency typically start between the ages of 1 month and 2 years and many include: Lethargy, Weakness, Sleepiness, Floppiness (poor muscle tone), Trouble breathing, Rapid breathing, Shakiness, Pale skin, Sweating, Irritability, Swollen tummy (due to an enlarged liver), Vomiting.

• #2 Newborn screening information for medium-chain acyl-CoA dehydrogenase deficiency | Baby’s First Test | Newborn Screening | Baby Health

  https://www.babysfirsttest.org/newborn-screening/conditions/medium-chain-acyl-coa-dehydrogenase-deficiency

  Medium-chain acyl-CoA dehydrogenase deficiency (MCAD) is a condition in which the body is unable to break down certain fats. If untreated, MCAD can cause brain damage and breathing problems. The first signs of medium-chain acyl-CoA dehydrogenase deficiency (MCAD) usually begin during infancy or early childhood (three months to three years of age). You might see signs such as: Sleeping longer or more often, Tiredness, Behavior changes, Irritable mood, Poor appetite, Fever, Diarrhea, Low blood sugar (referred to as hypoglycemia), Vomiting. Many of these signs may occur when your baby eats foods that his or her body cannot break down. They can be triggered by long periods of time without eating, illnesses, and infections. If MCAD is not treated, children may experience breathing problems, seizures, liver troubles, brain damage, coma, and possibly death. Early screening and treatment can avoid these effects. […] Children who receive early treatment for medium-chain acyl-CoA dehydrogenase deficiency (MCAD) have healthy growth and development.

• #2 MCAD deficiency | Encyclopedia.com

  https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/mcad-deficiency-0

  Individuals affected with MCAD deficiency produce a form of the MCAD enzyme that is not nearly as efficient as the normal form of MCAD. This lack of efficiency results in a greatly diminished, but still functional, capability to break down medium chain fatty acids. […] The severity of symptoms observed in individuals affected with MCAD deficiency ranges from no symptoms at all (asymptomatic) to the occurrence of death upon the first onset of symptoms. The first symptoms of MCAD deficiency generally occur within the first three years of life. The average age of onset of the first symptoms is one year of age. Some individuals become symptomatic prior to birth. The onset of symptoms in adults is extremely rare. […] Lethargy and persistent vomiting are the most typical symptoms of MCAD deficiency. The first episode of symptoms is generally preceded by a 12 to 16 hour period of stress. Most affected individuals show intermittent periods of low blood sugar (hypoglycemia) and higher than normal amounts of ammonia in the blood (hyperammonemia). An abnormally large liver (hepatomegaly) is also associated with MCAD deficiency.

• #2 An Educator’s Guide to MCADD — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/an-educators-guide-to-mcadd

  Children with MCADD may need more nutrients than their peers to maintain their energy levels and function in school. […] Depending on the severity of the child’s MCADD, the child may not have any symptoms. It is important to talk to the parent to know what to look for in case the child needs assistance.

• #2 Medium-chain Acyl-CoA Dehydrogenase (MCAD) Deficiency | Children’s Hospital of Philadelphia

  https://www.chop.edu/conditions-diseases/medium-chain-acyl-coa-dehydrogenase-mcad-deficiency

  Symptoms of MCAD deficiency can range from mild to severe. On the mild end, some individuals with MCAD deficiency may only have slight exercise intolerance. Children with more severe MCAD deficiency can have significant physical and intellectual disabilities. Severe MCAD deficiency usually appears in infancy. […] Symptoms of MCAD deficiency include: Low or no energy, Low blood sugar (hypoglycemia), Muscle weakness and reduced exercise tolerance, Vomiting. […] Because infants do not have significant energy storage in their bodies yet, those with MCAD deficiency can quickly become extremely sick (decompensate). […] If left untreated or not treated promptly and properly, MCAD deficiency can lead to brain injury, developmental delays, attention-deficit disorder, muscle weakness, reduced exercise tolerance, irregular heartbeats (cardiac arrhythmia), low blood sugar (hypoglycemia), liver disease, kidney disease and, in rare cases, sudden and unexpected death.

• #2 Medium-Chain Acyl-CoA Dehydrogenase Deficiency – MD Searchlight

  https://mdsearchlight.com/genetic-disorders/medium-chain-acyl-coa-dehydrogenase-deficiency/

  Patients diagnosed early with MCADD (Medium-chain acyl-CoA dehydrogenase deficiency, a rare genetic disorder that affects how the body processes fat to produce energy) and given proper care during sudden illnesses have an excellent chance of recovery. Early diagnosis through newborn screening (NBS) and follow-up care provided by centers specializing in metabolic disorders have reduced the disease’s health complications and death rates to nearly zero. Without a diagnosis, children have a mortality rate as high as 25% after experiencing the first symptoms. Moreover, many survivors can develop severe problems with brain function after this initial episode. […] One of the main concerns with this disease is that it can lead to problems with brain function, such as learning difficulties, speech problems, and attention deficit disorder. Research shows that when a person has a more severe form of the disease, it often goes hand in hand with these cognitive difficulties. To lessen this complication, it’s crucial to avoid going long periods without eating and to manage symptoms during illnesses.

• #3 MCAD deficiency | Altru Health System

  https://www.altru.org/health-library/conditions/mcad-deficiency

  MCAD deficiency is usually first identified in babies and young children. In rare cases, the disorder is not diagnosed until adulthood. […] Symptoms can vary among people with MCAD deficiency. They may include: Vomiting. Low or no energy. Weak feeling. Low blood sugar. […] A sudden severe episode, called a metabolic crisis, can be due to: Going too long without eating. Missing meals. Common infections. High fever. Ongoing stomach and digestive problems that may cause vomiting and diarrhea. Intense exercise. […] If metabolic crisis caused by MCAD deficiency is left untreated, it can lead to: Seizures. Liver problems. Brain damage. Coma. Sudden death. […] Newborn screening at birth allows MCAD deficiency to be diagnosed and treated early, before symptoms occur, preventing complications. Once identified, the disorder can be managed through diet and lifestyle.

• #3 Medium-chain Acyl-CoA Dehydrogenase (MCAD) Deficiency | Children’s Hospital of Philadelphia

  https://www.chop.edu/conditions-diseases/medium-chain-acyl-coa-dehydrogenase-mcad-deficiency

  Symptoms of MCAD deficiency can range from mild to severe. On the mild end, some individuals with MCAD deficiency may only have slight exercise intolerance. Children with more severe MCAD deficiency can have significant physical and intellectual disabilities. Severe MCAD deficiency usually appears in infancy. […] Symptoms of MCAD deficiency include: Low or no energy, Low blood sugar (hypoglycemia), Muscle weakness and reduced exercise tolerance, Vomiting. […] Because infants do not have significant energy storage in their bodies yet, those with MCAD deficiency can quickly become extremely sick (decompensate). […] If left untreated or not treated promptly and properly, MCAD deficiency can lead to brain injury, developmental delays, attention-deficit disorder, muscle weakness, reduced exercise tolerance, irregular heartbeats (cardiac arrhythmia), low blood sugar (hypoglycemia), liver disease, kidney disease and, in rare cases, sudden and unexpected death.

• #3 An Educator’s Guide to MCADD — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/an-educators-guide-to-mcadd

  Children with MCADD usually have symptoms for the first time between three months and two years of age. These symptoms are often brought on when a child stops eating, usually because of a common illness such as the flu, an ear infection, or a cold. […] MCADD can cause a metabolic crisis. A metabolic crisis may start with symptoms of fever, diarrhea, and vomiting. This is usually followed by low blood sugar. If a metabolic crisis is not treated, it can lead to breathing problems, coma, or death. Prompt treatment can prevent these consequences. […] If children with MCADD go too long without food, low blood sugar (hypoglycemia) can occur, with or without other symptoms of a metabolic crisis. Low blood sugar can cause weakness, shakiness, dizziness, or cold, clammy skin. […] Symptoms often occur after a child has nothing to eat for more than a few hours. During long periods without eating food, the glucose in the body is used up. Some of the first symptoms include: Sleepiness, Behavior changes, Irritable mood, Poor appetite, Low Energy, Fatigue, Vomiting.

• #3 MCAD deficiency

  https://www.mymlc.com/health-information/diseases-and-conditions/m/mcad-deficiency/?section=Causes

  Sometimes episodes of hypoglycemia can occur with no symptoms in between these episodes. […] If the hypoglycemia caused by MCAD deficiency is left untreated, it can lead to: Seizures, Breathing problems, Liver problems, Brain damage, Coma, Sudden death. […] Episodes of low blood sugar (hypoglycemia) thought to be caused by MCAD deficiency are evaluated by a discussion of signs and symptoms, as well as dietary habits, usually followed by lab tests to identify problems with metabolism and treat or prevent complications. […] Newborn screening at birth allows MCAD deficiency to be diagnosed and treated early, before symptoms occur, preventing complications. Once identified, the disorder can be managed through diet and lifestyle. […] The main goal of treatment for MCAD deficiency is to prevent problems caused by hypoglycemia from occurring. Infants with MCAD deficiency require frequent feedings with adequate calories from complex carbohydrates to maintain blood sugar and avoid hypoglycemia. Children and adults also require adequate complex carbohydrates on a regular schedule of eating.

• #3 MCAD deficiency | Encyclopedia.com

  https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/mcad-deficiency-0

  Approximately half of all individuals showing symptoms of MCAD deficiency for the first time experience respiratory arrest, cardiac arrest, and/or sudden infant death. Between 20% and 25% of all MCAD deficiency affected infants die during their first episodes of symptoms. […] Some individuals affected with MCAD deficiency also are affected with a degenerative disease of the brain and central nervous system (encephalopathy). Seizures, coma, and periods of halted breathing (apnea) have also been seen in people with MCAD deficiencies. […] Long-term symptoms of MCAD deficiency may include: attention deficit disorder (ADD), cerebral palsy, mental retardation, and/or developmental delays. […] The severity of the symptoms associated this MCAD deficiency is linked to the age of the person when the symptoms first happen. The risk of dying from an onset of the disease is slightly higher in individuals who show the first symptoms after the age of one year. The highest risk ages are the ages of 15 to 26 months. Seizures and encephalopathy are most frequently seen in affected individuals between the ages of 12 and 18 months. Seizures at these ages are often associated with future death during a symptomatic episode, recurrent seizures throughout life, the development of cerebral palsy, and/or the development of speech disabilities.

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