Materiały źródłowe

• #1 Isovaleric acidaemia

  https://www.nhs.uk/conditions/isovaleric-acidaemia/

  If IVA is diagnosed, treatment can be given straight away to reduce the risk of serious complications. Treatment includes a special diet, advice and sometimes medicine. […] With early diagnosis and the correct treatment, the majority of children with IVA are able to live healthy lives. However, treatment for IVA must be continued for life. […] Children diagnosed with IVA are referred to a specialist metabolic dietitian and given a low-protein diet. This is tailored to reduce the amount of leucine your baby receives. […] Your dietitian will provide detailed advice and guidance, as your baby still needs some of these foods for healthy growth and development. […] People with IVA need to follow a modified diet for the rest of their life to reduce their risk of a metabolic crisis. […] Your child may be prescribed medicine to help clear some of the excess isovaleric acid.

• #1 Isovaleric acidemia: Symptoms, causes, treatments, and more

  https://www.medicalnewstoday.com/articles/isovaleric-acidaemia

  Treatment for IVA involves: […] managing the diet […] taking medications that promote the breakdown of excess isovaleric acid […] managing metabolic crises with emergency treatment. […] People with IVA need to avoid eating high protein foods, including: […] A registered dietitian can recommend alternatives to breast milk, including a protein-free milk formula. This will contain other amino acids and all the necessary vitamins and minerals to support a growing infant. […] Dietary changes are lifelong for people with IVA. A dietitian can advise on changing the diet as an infant grows. […] Prescription medications that can reduce the amount of leftover valeric acid include L-carnitine and glycine. Some people may need to take both. […] The risk of a metabolic crisis becomes higher if a child catches a cold or other tract infection. During this time, a child may need to follow an emergency diet consisting of specialized, high sugar drinks.

• #1 Isovaleric Acidemia – DoveMed

  https://www.dovemed.com/diseases-conditions/isovaleric-acidemia

  A prompt and proper treatment from a very early age is necessary to prevent severe signs and symptoms or adverse complications from developing. The treatment measures include dietary changes, such as having a low-leucine diet, avoidance of certain high-protein foods, and prescription medications […] In order to prevent metabolic crisis, prompt treatment of Isovaleric Acidemia is essential. Although, there is no cure to eliminate IVA, changes in diet have been shown to improve the symptoms […] A low-leucine diet will help eliminate isovaleric acid buildup in the body […] It is suggested that milk and dairy products, meat, fish, eggs, dried beans, legumes, nuts, and peanut butter, which are all high in protein (and leucine), be avoided […] There are also specialized medical foods and formulas that are made for those with such organic acid metabolic disorders. Taking or consuming these products can help reduce the symptoms

• #1 Isovaleric acidemia: Therapeutic response to supplementation with glycine, l-carnitine, or both in combination and a 10-year follow-up case study

  https://pmc.ncbi.nlm.nih.gov/articles/PMC6282653/

  Isovaleric acidemia (IVA) is an organic acid disease caused by a deficiency of isovaleryl-CoA dehydrogenase. The proposed IVA treatments include leucine restriction and l-carnitine and/or glycine supplementation, which convert isovaleric acid into non-toxic isovalerylcarnitine and isovalerylglycine, respectively. […] After initiation of both glycine (200 mg/kg/day) and l-carnitine (100 mg/kg/day) supplementation at 5 years of age, doses were gradually reduced to 111.7 mg/kg/day and 55.8 mg/kg/day, respectively, at 15 years of age. […] We concluded that l-carnitine conjugated isovaleric acid earlier than glycine. Additionally, during the 10-year follow-up period, the patient displayed no clinical deterioration. […] The proposed IVA treatments include dietary leucine restriction and dietary supplementation with l-carnitine and/or glycine to conjugate isovaleric acid, resulting in its conversion into non-toxic IVC and IVG that are subsequently excreted in urine.

• #1 L-carnitine therapy in isovaleric acidemia – PubMed

  https://pubmed.ncbi.nlm.nih.gov/6549017/

  Isovaleric acidemia, resulting from isovaleryl-coenzyme A dehydrogenase deficiency, is associated with marked reduction of free carnitine in both plasma and urine. […] Administration of equimolar amounts of glycine or L-carnitine separately with leucine demonstrated that isovaleryl-coenzyme A is removed by supplemental L-carnitine in the form of isovalerylcarnitine as effectively as it is by glycine, in the form of isovalerylglycine. […] Treatment with L-carnitine alone has proven effective in preventing further hospitalizations in a patient with this genetic disorder.

• #1 Aspects of Newborn Screening in Isovaleric Acidemia

  https://www.mdpi.com/2409-515X/4/1/7

  Many patients with a clinically symptomatic type of IVA follow a protein-restricted diet to reduce their intake of leucine and limit the production of toxic metabolites. […] l-carnitine is usually given at a dosage of 100 mg/kg × day in three doses. […] During intercurrent illness, the production of isovaleryl-CoA might be increased due to a higher rate of breakdown of the endogenous protein. […] Therefore, the prevention of catabolic episodes is crucial. […] A short-term decrease of protein intake should also be part of the acute treatment protocol. […] In order to prevent the accumulation of toxic metabolites, increased doses of l-carnitine (up to 400 mg/kg × day) and l-glycine (by 50% to 100%) have been recommended. […] As for other classic organic acidurias, treatment with N-carbaglutamate has been suggested for the treatment of acute neonatal hyperammonemia in IVA. […] Individuals with this condition should also be counseled to follow an emergency protocol and to increase the intake of l-carnitine and energy during febrile illnesses.

• #1 IVA (isovaleric acidemia) – newbornscreening.info

  https://www.newbornscreening.info/iva-isovaleric-acidemia/

  2. Medications Glycine is an amino acid that helps the body get rid of isovaleric acid. It is often given as a supplement to children with IVA. It may help prevent metabolic crises. Your doctor will tell you whether your child needs glycine and how much to use. […] 3. Call your doctor at the start of any illness In some children, even minor illnesses such as a cold or the flu can lead to a metabolic crisis. In order to prevent problems, call your doctor right away when your child has any of the following: […] Children with IVA need to eat more carbohydrates and drink more fluids when they are ill even if theyre not hungry or they could have a metabolic crisis. […] With prompt and careful treatment, children with IVA have a good chance to live healthy lives with typical growth and development.

• #1 TREATMENT OF ISOVALERIC ACIDEMIA WITH GLYCINE SUPPLEMENTS | Pediatric Research

  https://www.nature.com/articles/pr1987839

  Isovaleric Acidemia is treated with L-leucine restriction and supplemental glycine. Added glycine augments conversion of isovaleric acid (IVA) to isovalerylglycine (IVG) through glycine-N-acylase. The optimum glycine dosage for management of isovaleric acidemia is not known. […] We conclude that when IVA accumulation is minimal, optimum glycine dosage is 150 mg/kg/d; under these conditions glycine intakes of 300 and 600 mg/kg/d inhibit IVG production. However, when acute insults raise IVA production glycine supplements of 600 mg/kg/d increase IVG production two fold.

• #1 Isovaleric Acidemia — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/isova

  Hemodialysis: this is indicated in cases of intractable metabolic acidosis, severe hyperammonemia, unresponsive to treatment. […] L-carnitine (oral or intravenous) to conjugate and detoxify isovaleryl-CoA (forming isovalerylcarnitine), thus reducing isovaleric and related toxic metabolites. […] An acute metabolic decompensation in a patient with IVA is almost always precipitated by a stressor, such as infection, injury, surgery, hormonal changes, or significant dietary changes. […] Antibiotics should be provided to treat the particular infection. […] Management would include limiting protein intake.

• #1 Isovaleric Acidaemia – Metabolic Support UKAccessibility ToolsIncrease TextDecrease TextGrayscaleHigh ContrastNegative ContrastLight BackgroundLinks UnderlineReadable FontReset

  https://metabolicsupportuk.org/condition/isovaleric-acidaemia/

  There is no cure for Isovaleric Acidaemia, however there are a range of ways that the disorder can be managed successfully, and plans can be put in place to reduce the chances of the disorder getting worse. […] One of the most important ways to manage the disorder is through following a specific diet. It is recommended that you follow a low-protein diet, as people with Isovaleric Acidaemia are unable to process protein properly. A specialised dietitian will help to develop an appropriate diet plan for you. It is important that you speak to your dietitian before making any changes to your food intake so that they can help you to make informed, healthy choices. […] If you do not follow your dietary advice, or you have long periods without eating, you may experience a metabolic crisis. Symptoms include: Vomiting and an inability to keep food down, Lack of energy, Irritability, Breathing difficulties.

• #1 Isovaleric acidaemia

  https://www.nhs.uk/conditions/isovaleric-acidaemia/

  Medicine for IVA needs to be taken regularly, as directed by your doctor. […] If your baby develops an infection, such as a high temperature or cold, their risk of having a metabolic crisis increases. It’s possible to reduce the risk by changing to an emergency diet while they’re ill. […] Your dietitian will provide detailed instructions, but the aim is to replace milk and food containing protein with special high-sugar drinks.

• #1 Orphanet: Isovaleric acidemia

  https://www.orpha.net/en/disease/detail/33

  Lifelong management is with a low protein diet. Children diagnosed with IVA should be referred to a metabolic dietician who can tailor the diet to support normal growth and development. Supplementing with artificial protein restricted in leucine may be required. L-carnitine and glycine may be prescribed to clear excess isovaleric acid. Emergency treatment in times of metabolic stress (including illness and fasting) is with an anabolic diet. Reducing, but not eliminating, natural protein in the diet for 12-24 hours may help, but only if additional other calories can be given to promote anabolism. […] Prognosis for patients diagnosed by newborn screening is excellent with the potential for normal neurodevelopmental outcome with appropriate metabolic management. Patients who present symptomatically can have significant neurologic sequelae including neurodevelopmental delay, especially if acidosis and hyperammonemia are severe.

• #1 Isovaleric acidemia: Symptoms, causes, treatments, and more

  https://www.medicalnewstoday.com/articles/isovaleric-acidaemia

  It is important to contact the metabolic team at the nearest hospital if a child with IVA vomits up their emergency fluids or regularly has diarrhea during feeding. […] After an IVA diagnosis, people will need to avoid high protein food and take lifelong medications to clear waste acids from the body. However, those with IVA can have a typical life expectancy with effective treatment.

• #1 Isovaleric Acidemia — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/isova

  This acute illness protocol is a guideline for healthcare professionals treating the sick infant or child who is known to have isovaleric acidemia. […] Treatment of IVA includes control of leucine, an essential amino acid. […] In a metabolic crisis, a patient with IVA should receive high rate intravenous fluids (either via a peripheral venous line or a central venous line) for rehydration purposes and also for provision of calories. […] All protein intake should be halted once it is determined that a patient with IVA is having a metabolic decompensation severe enough to need acute metabolic management. […] If blood glucose is below 50 mg/dL, give 5-10 ml/kg bolus of D10 intravenously. […] If ammonia levels are extremely elevated, there are two modes of treatment: medical treatment (ammonul infusion which provides scavenger medications to reduce ammonia level) and hemodialysis.

• #1 Hyperammonaemia in classic organic acidaemias: a review of the literature and two case histories | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-018-0963-7

  There are currently no specific guidelines for managing IVA. In general, the management approach for this OA is similar to that for PA or MMA except that leucine restriction and glycine supplementation are introduced to reduce the accumulation of isovaleric acid and promote its excretion. […] Treatment with N-carbamyl-L-glutamate (NCG; Carbaglu, Orphan Europe), a stable synthetic analogue of NAG, the essential co-factor of CPS-1, can stimulate the first step of the urea cycle, enabling the formation of carbamyl phosphate and reducing ammonia levels in patients with secondary hyperammonaemia. […] NCG may also be effective in the long-term treatment in patients with severe PA and MMA with recurrent episodes of hyperammonaemia. […] In patients with PA or MMA who experience repeated metabolic decompensation, or in whom the disease is difficult to manage with diet and pharmacological therapy, liver transplantation can reduce the number of hospitalisations and improve quality of life.

• #1 | Myriad Prequel® Prenatal Screen

  https://myriad.com/womens-health/diseases/isovaleric-acidemia/

  Individuals with IVA need a special diet, which is low in leucine and contains proteins. For example, infants may be treated with a leucine-free formula. The supplements carnitine and glycine can reduce the toxicity of isovaleric acid and aid in its removal from the body. […] Individuals with IVA need close monitoring by a physician during times of illness and may need to ensure adequate hydration and adopt a diet high in carbohydrates. Symptoms such as vomiting, diarrhea, and illness with a fever may require prompt treatment. […] Frequent monitoring of individuals with IVA is important to determine that proper growth, metabolism, and development is ongoing.

• #1 Isovaleric acidemia: Therapeutic response to supplementation with glycine, l-carnitine, or both in combination and a 10-year follow-up case study

  https://pmc.ncbi.nlm.nih.gov/articles/PMC6282653/

  We examined the acute biochemical response, including serum ammonia levels, to a leucine load test following supplementation with glycine, l-carnitine, or both glycine and l-carnitine in combination. […] We suggest that serum ammonia is a key parameter, in addition to IVG and IVC, during a leucine load test. […] There are currently insufficient data to determine the appropriate doses of glycine and l-carnitine individually, and further investigation is warranted.

• #1 Isovaleric acidemia | MedLink Neurology

  https://www.medlink.com/articles/isovaleric-acidemia

  It is unclear whether patients carrying the common mutation (A282V, 932C T) associated with a biochemically and clinically mild phenotype require any treatment. Close observation during periods of metabolic stress and carnitine supplementation if free carnitine concentrations are very low seems reasonable.

• #1 Anesthesia Experts | Anesthetic Management of a Patient with Isovaleric Acidemia

  https://anesthesiaexperts.com/anesthetic-management-patient-isovaleric-acidemia/

  A 3-year-old male with isovaleric acidemia presented for dental rehabilitation under general anesthesia. […] Therapy consists of 3 goals. The first is preventing a metabolic crisis using careful clinical observation and encouraging anabolism in times of metabolic stress, including illness, fasting, and surgery, by both administering oral solutions with simple sugars to increase oral intake and reducing leucine intake by using leucine-free formula or powders for nutrition. […] The second goal of therapy is reducing production of isovaleryl-CoA from leucine catabolism through dietary manipulation. […] The third goal of therapy is reducing accumulation of toxic metabolites by diverting isovaleryl-CoA toward reactions that are nontoxic and can be easily excreted. […] Anesthesiologists caring for patients with isovaleric acidemia should be aware of the complex preparation required for provision of a safe and effective anesthetic plan. This includes preprocedure dietary protein restriction to assist in the control of the production of isovaleryl-CoA, preprocedure dietary supplementation with glycine and levocarnitine to prevent the accumulation of toxic metabolites by directing isovaleryl-CoA metabolism toward the production of nontoxic metabolites, and finally an intraoperative glucose source to assist in reducing protein catabolism. […] In conclusion, isovaleric acidemia is a complex metabolic disorder with important implications for an anesthesiologist. Careful preoperative planning should involve those already caring for the patient to facilitate the likelihood of a favorable outcome following anesthesia and surgery.

• #1 NEWBORN SCREENING

  http://w.newbornscreening.info/Parents/organicaciddisorders/IVA.html

  2. Medications Glycine is an amino acid that helps the body get rid of isovaleric acid. It is often given as a supplement to children with IVA. It may help prevent metabolic crises. Your doctor will tell you whether your child needs glycine and how much to use. […] 3. Call your doctor at the start of any illness In some children, even minor illnesses such as a cold or the flu can lead to a metabolic crisis. […] With prompt and careful treatment, children with IVA have a good chance to live healthy lives with typical growth and development. […] Even when treated, some children still have repeated bouts of metabolic crisis. This can lead to life-long learning problems or intellectual disabilities. As they get older, children tend to have fewer metabolic crises.

• #1 Aspects of Newborn Screening in Isovaleric Acidemia

  https://www.mdpi.com/2409-515X/4/1/7

  Isovaleric acidemia (IVA), an inborn error of leucine catabolism, is caused by mutations in the isovaleryl-CoA dehydrogenase (IVD) gene, resulting in the accumulation of derivatives of isovaleryl-CoA including isovaleryl (C5)-carnitine, the marker metabolite used for newborn screening (NBS). […] Treatment strategies for the long-term management of symptomatic IVA comprise the prevention of catabolism, dietary restriction of natural protein or leucine intake, and supplementation with l-carnitine and/or l-glycine. […] Long-term treatment strategies aim to: (1) reduce the production of toxic metabolites by the restriction of protein or leucine intake; and to (2) enhance the conjugation of potentially toxic free isovaleric acid to its non-toxic conjugates isovalerylcarnitine and isovalerylglycine, which are excreted by the kidneys via supplementation of l-carnitine and/or l-glycine.

• #2 Aspects of Newborn Screening in Isovaleric Acidemia

  https://www.mdpi.com/2409-515X/4/1/7

  Isovaleric acidemia (IVA), an inborn error of leucine catabolism, is caused by mutations in the isovaleryl-CoA dehydrogenase (IVD) gene, resulting in the accumulation of derivatives of isovaleryl-CoA including isovaleryl (C5)-carnitine, the marker metabolite used for newborn screening (NBS). […] Treatment strategies for the long-term management of symptomatic IVA comprise the prevention of catabolism, dietary restriction of natural protein or leucine intake, and supplementation with l-carnitine and/or l-glycine. […] Long-term treatment strategies aim to: (1) reduce the production of toxic metabolites by the restriction of protein or leucine intake; and to (2) enhance the conjugation of potentially toxic free isovaleric acid to its non-toxic conjugates isovalerylcarnitine and isovalerylglycine, which are excreted by the kidneys via supplementation of l-carnitine and/or l-glycine.

• #2 Isovaleric acidemia: Symptoms, causes, treatments, and more

  https://www.medicalnewstoday.com/articles/isovaleric-acidaemia

  Treatment for IVA involves: […] managing the diet […] taking medications that promote the breakdown of excess isovaleric acid […] managing metabolic crises with emergency treatment. […] People with IVA need to avoid eating high protein foods, including: […] A registered dietitian can recommend alternatives to breast milk, including a protein-free milk formula. This will contain other amino acids and all the necessary vitamins and minerals to support a growing infant. […] Dietary changes are lifelong for people with IVA. A dietitian can advise on changing the diet as an infant grows. […] Prescription medications that can reduce the amount of leftover valeric acid include L-carnitine and glycine. Some people may need to take both. […] The risk of a metabolic crisis becomes higher if a child catches a cold or other tract infection. During this time, a child may need to follow an emergency diet consisting of specialized, high sugar drinks.

• #2 Long Term Follow-Up of Polish Patients with Isovaleric Aciduria. Clinical and Molecular Delineation of Isovaleric Aciduria

  https://www.mdpi.com/2075-4418/10/10/738

  In 2014, the web-based E-IMD IVA Guidelines were published, which stated that natural protein intake should be restricted to reduce the isovaleric acid burden but should satisfy at least the WHO/FAO/UNU 2007 safe levels of protein intake. […] Our practice suggests that early diagnosis, either through NBS or FS, resulting in the early introduction of a special diet, might not prevent metabolic decompensations, but provides a good clinical outcome. […] If decompensation occurs, it is milder and without severe, persistent complications.

• #2 IVA (isovaleric acidemia) – newbornscreening.info

  https://www.newbornscreening.info/iva-isovaleric-acidemia/

  Your babys primary doctor will work with a metabolic doctor and a dietician experienced with IVA to care for your child. […] Prompt treatment is needed to prevent metabolic crises and the health effects that follow. You should start treatment as soon as you know your child has IVA. Certain treatments may be advised for some children but not others. Treatment is usually needed throughout life. […] The following are treatments often recommended for babies and children with IVA: […] 1. Low-leucine diet, medical foods, and formula Most children need to eat a diet made up of foods low in leucine. Special medical foods and a leucine-free formula are usually part of the diet. Your dietician will create a food plan that contains the right amount of protein, nutrients, and energy to keep your child healthy. A special food plan should be continued throughout life.

• #2 Isovaleric Acidemia – DoveMed

  https://www.dovemed.com/diseases-conditions/isovaleric-acidemia

  A prompt and proper treatment from a very early age is necessary to prevent severe signs and symptoms or adverse complications from developing. The treatment measures include dietary changes, such as having a low-leucine diet, avoidance of certain high-protein foods, and prescription medications […] In order to prevent metabolic crisis, prompt treatment of Isovaleric Acidemia is essential. Although, there is no cure to eliminate IVA, changes in diet have been shown to improve the symptoms […] A low-leucine diet will help eliminate isovaleric acid buildup in the body […] It is suggested that milk and dairy products, meat, fish, eggs, dried beans, legumes, nuts, and peanut butter, which are all high in protein (and leucine), be avoided […] There are also specialized medical foods and formulas that are made for those with such organic acid metabolic disorders. Taking or consuming these products can help reduce the symptoms

• #2 L-carnitine therapy in isovaleric acidemia – PubMed

  https://pubmed.ncbi.nlm.nih.gov/6549017/

  Isovaleric acidemia, resulting from isovaleryl-coenzyme A dehydrogenase deficiency, is associated with marked reduction of free carnitine in both plasma and urine. […] Administration of equimolar amounts of glycine or L-carnitine separately with leucine demonstrated that isovaleryl-coenzyme A is removed by supplemental L-carnitine in the form of isovalerylcarnitine as effectively as it is by glycine, in the form of isovalerylglycine. […] Treatment with L-carnitine alone has proven effective in preventing further hospitalizations in a patient with this genetic disorder.

• #2

  https://www.jci.org/articles/view/111657

  L-carnitine therapy in isovaleric acidemia. […] Isovaleric acidemia, resulting from isovaleryl-coenzyme A dehydrogenase deficiency, is associated with marked reduction of free carnitine in both plasma and urine. […] Administration of equimolar amounts of glycine or L-carnitine separately with leucine demonstrated that isovaleryl-coenzyme A is removed by supplemental L-carnitine in the form of isovalerylcarnitine as effectively as it is by glycine, in the form of isovalerylglycine. […] Treatment with L-carnitine alone has proven effective in preventing further hospitalizations in a patient with this genetic disorder.

• #2 Isovaleric acidemia: Therapeutic response to supplementation with glycine, l-carnitine, or both in combination and a 10-year follow-up case study

  https://pmc.ncbi.nlm.nih.gov/articles/PMC6282653/

  Isovaleric acidemia (IVA) is an organic acid disease caused by a deficiency of isovaleryl-CoA dehydrogenase. The proposed IVA treatments include leucine restriction and l-carnitine and/or glycine supplementation, which convert isovaleric acid into non-toxic isovalerylcarnitine and isovalerylglycine, respectively. […] After initiation of both glycine (200 mg/kg/day) and l-carnitine (100 mg/kg/day) supplementation at 5 years of age, doses were gradually reduced to 111.7 mg/kg/day and 55.8 mg/kg/day, respectively, at 15 years of age. […] We concluded that l-carnitine conjugated isovaleric acid earlier than glycine. Additionally, during the 10-year follow-up period, the patient displayed no clinical deterioration. […] The proposed IVA treatments include dietary leucine restriction and dietary supplementation with l-carnitine and/or glycine to conjugate isovaleric acid, resulting in its conversion into non-toxic IVC and IVG that are subsequently excreted in urine.

• #2

  https://www.jci.org/articles/view/111657/usage

  L-carnitine therapy in isovaleric acidemia. […] Treatment with L-carnitine alone has proven effective in preventing further hospitalizations in a patient with this genetic disorder.

• #2 NEWBORN SCREENING

  http://w.newbornscreening.info/Parents/organicaciddisorders/IVA.html

  2. Medications Glycine is an amino acid that helps the body get rid of isovaleric acid. It is often given as a supplement to children with IVA. It may help prevent metabolic crises. Your doctor will tell you whether your child needs glycine and how much to use. […] 3. Call your doctor at the start of any illness In some children, even minor illnesses such as a cold or the flu can lead to a metabolic crisis. […] With prompt and careful treatment, children with IVA have a good chance to live healthy lives with typical growth and development. […] Even when treated, some children still have repeated bouts of metabolic crisis. This can lead to life-long learning problems or intellectual disabilities. As they get older, children tend to have fewer metabolic crises.

• #2 The Treatment of Isovaleric Acidemia with Glycine Supplement | Pediatric Research

  https://www.nature.com/articles/pr1988373

  ABSTRACT: Although dietary leucine restriction and supplemental glycine are used to treat patients with isovaleric acidemia, little quantitative information is available regarding their optimum relationship. […] We found that under stable conditions of leucine restriction, 150 mg glycine/kg/day is an optimum glycine supplement and that glycine supplements of more than 250 mg/kg/day may result in reduced isovalerylglycine production; that when isovaleric acid accumulation is increased, glycine supplements to 600 mg/kg/day will increase isovalerylglycine production; and that the phenotype of isovaleric acidemia is related not only to the extent of impaired isovaleryl-CoA dehydrogenase, but also the ability to detoxify accumulated isovaleryl CoA to isovalerylglycine.

• #2 Isovaleric acidemia | MedLink Neurology

  https://www.medlink.com/articles/isovaleric-acidemia

  In contrast, in metabolic crises, when isovaleric acid accumulation is increased, glycine supplements to 600 mg/kg/day will increase isovalerylglycine production. […] Many patients with isovaleric acidemia show low total carnitine levels in plasma and a high percentage of esterified carnitines in plasma and urine. […] Therefore, L-carnitine should be supplemented in 40 to 100 mg/kg doses to ensure high-normal free carnitine levels in plasma. […] During acute decompensation, isovaleric acidemia must be treated like other organic acidemias. Measures include increased energy provision via oral, nasogastric, or intravenous routes by 20% to 100% above the recommended daily requirements using carbohydrates (eg, glucose or dextrose 20% orally or glucose intravenously) and fat (intralipid 20%).

• #2 Isovaleric Acidaemia – Metabolic Support UKAccessibility ToolsIncrease TextDecrease TextGrayscaleHigh ContrastNegative ContrastLight BackgroundLinks UnderlineReadable FontReset

  https://metabolicsupportuk.org/condition/isovaleric-acidaemia/

  There is no cure for Isovaleric Acidaemia, however there are a range of ways that the disorder can be managed successfully, and plans can be put in place to reduce the chances of the disorder getting worse. […] One of the most important ways to manage the disorder is through following a specific diet. It is recommended that you follow a low-protein diet, as people with Isovaleric Acidaemia are unable to process protein properly. A specialised dietitian will help to develop an appropriate diet plan for you. It is important that you speak to your dietitian before making any changes to your food intake so that they can help you to make informed, healthy choices. […] If you do not follow your dietary advice, or you have long periods without eating, you may experience a metabolic crisis. Symptoms include: Vomiting and an inability to keep food down, Lack of energy, Irritability, Breathing difficulties.

• #2 Aspects of Newborn Screening in Isovaleric Acidemia

  https://www.mdpi.com/2409-515X/4/1/7

  Many patients with a clinically symptomatic type of IVA follow a protein-restricted diet to reduce their intake of leucine and limit the production of toxic metabolites. […] l-carnitine is usually given at a dosage of 100 mg/kg × day in three doses. […] During intercurrent illness, the production of isovaleryl-CoA might be increased due to a higher rate of breakdown of the endogenous protein. […] Therefore, the prevention of catabolic episodes is crucial. […] A short-term decrease of protein intake should also be part of the acute treatment protocol. […] In order to prevent the accumulation of toxic metabolites, increased doses of l-carnitine (up to 400 mg/kg × day) and l-glycine (by 50% to 100%) have been recommended. […] As for other classic organic acidurias, treatment with N-carbaglutamate has been suggested for the treatment of acute neonatal hyperammonemia in IVA. […] Individuals with this condition should also be counseled to follow an emergency protocol and to increase the intake of l-carnitine and energy during febrile illnesses.

• #2 | Myriad Prequel® Prenatal Screen

  https://myriad.com/womens-health/diseases/isovaleric-acidemia/

  Individuals with IVA need a special diet, which is low in leucine and contains proteins. For example, infants may be treated with a leucine-free formula. The supplements carnitine and glycine can reduce the toxicity of isovaleric acid and aid in its removal from the body. […] Individuals with IVA need close monitoring by a physician during times of illness and may need to ensure adequate hydration and adopt a diet high in carbohydrates. Symptoms such as vomiting, diarrhea, and illness with a fever may require prompt treatment. […] Frequent monitoring of individuals with IVA is important to determine that proper growth, metabolism, and development is ongoing.

• #2 Hyperammonaemia in classic organic acidaemias: a review of the literature and two case histories | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-018-0963-7

  The acute management of hyperammonaemia in organic acidaemias requires administration of intravenous calories as glucose and lipids to promote anabolism, carnitine to promote urinary excretion of urinary organic acid esters, and correction of metabolic acidosis with the substitution of bicarbonate for chloride in intravenous fluids. It may also include the administration of ammonia scavengers such as sodium benzoate or sodium phenylbutyrate. Treatment with N-carbamyl-L-glutamate can rapidly normalise ammonia levels by stimulating the first step of the urea cycle. […] Current guidelines for managing OAs focus on PA and MMA. The initial aim of therapy is to reverse endogenous catabolism and provide sufficient energy to promote anabolism. Sufficient calories should be provided by intravenous glucose and lipids to prevent further catabolism, and metabolic acidosis can be corrected by substituting bicarbonate and acetate for chloride in intravenous (IV) solutions.

• #2 Isovaleric Acidemia — New England Consortium of Metabolic Programs

  https://www.newenglandconsortium.org/isova

  Hemodialysis: this is indicated in cases of intractable metabolic acidosis, severe hyperammonemia, unresponsive to treatment. […] L-carnitine (oral or intravenous) to conjugate and detoxify isovaleryl-CoA (forming isovalerylcarnitine), thus reducing isovaleric and related toxic metabolites. […] An acute metabolic decompensation in a patient with IVA is almost always precipitated by a stressor, such as infection, injury, surgery, hormonal changes, or significant dietary changes. […] Antibiotics should be provided to treat the particular infection. […] Management would include limiting protein intake.

• #2 Isovaleric Acidemia (IVA) | Newborn Screening Ontario

  https://www.newbornscreening.on.ca/en/results/screen-positive-results/disease-information/isovaleric-acidemia-iva/

  Treatment for IVA is started as early as possible and is usually life long. […] Treatment may include: Frequent feeding, especially when ill (to prevent a metabolic crisis, babies with IVA must not go a long time without eating) […] A low protein diet and special leucine-free medical foods […] Supplements and medications, such as glycine, carnitine and antibiotics may be prescribed […] A team, including a metabolic doctor and a dietitian, cares for babies with IVA. […] Babies with IVA have their health and development checked regularly. […] Regular follow-up tests are used to monitor and adjust treatments. […] If signs of a metabolic crisis (above) are present, urgent medical care must be found.

• #2 Isovaleric acidemia | MedLink Neurology

  https://www.medlink.com/articles/isovaleric-acidemia

  Treatment must be supervised by an experienced metabolic center and must continue for life. Special care must be taken to ensure efficient emergency procedures at all times (including travel and holidays). […] If treatment is initiated before the development of severe metabolic decompensation, the patients prognosis is significantly improved. Patients who are diagnosed by newborn screening usually have normal psychomotor development. […] The primary aim in treating isovaleric acidemia is to prevent the formation of and lower the levels of accumulating toxic metabolites. […] The other important therapy principle is to increase the excretion of isovaleric acid as nontoxic glycine and carnitine conjugates. […] Glycine supplementation of more than 250 mg/kg/day under stable conditions may reduce isovalerylglycine production.

• #2

  https://www.gov.uk/government/publications/iva-is-suspected-description-in-brief/isovaleric-acidaemia-iva-mild-iva

  If your baby does have mild IVA, the metabolic team will explain the condition in more detail and answer any questions you might have. […] No special diet or medical treatment is required unless your baby becomes unwell. […] With prompt use of the emergency regimen, the outcome is very good and most children with mild IVA will avoid any long-term health problems.

• #2 IVA (isovaleric acidemia) – newbornscreening.info

  https://www.newbornscreening.info/iva-isovaleric-acidemia/

  2. Medications Glycine is an amino acid that helps the body get rid of isovaleric acid. It is often given as a supplement to children with IVA. It may help prevent metabolic crises. Your doctor will tell you whether your child needs glycine and how much to use. […] 3. Call your doctor at the start of any illness In some children, even minor illnesses such as a cold or the flu can lead to a metabolic crisis. In order to prevent problems, call your doctor right away when your child has any of the following: […] Children with IVA need to eat more carbohydrates and drink more fluids when they are ill even if theyre not hungry or they could have a metabolic crisis. […] With prompt and careful treatment, children with IVA have a good chance to live healthy lives with typical growth and development.

• #2 Isovaleric Acidaemia – Metabolic Support UKAccessibility ToolsIncrease TextDecrease TextGrayscaleHigh ContrastNegative ContrastLight BackgroundLinks UnderlineReadable FontReset

  https://metabolicsupportuk.org/condition/isovaleric-acidaemia/

  You will be given an emergency treatment plan to implement at home in times of metabolic crisis. However, this may include attending hospital if the symptoms do not improve quickly. Speak to your medical team to discuss an emergency treatment plan that is suitable for you. […] Although many people with this disorder will live a healthy life, this is increased by an early diagnosis and careful adherence to the treatment plan that your medical team give you. However, some people with more severe cases of Isovaleric Acidaemia may experience repeated metabolic crises, despite following their treatment plans. This can increase the likelihood of damage to the brain and cause learning difficulties or intellectual disabilities.

• #2

  https://www.gov.uk/government/publications/iva-is-suspected-description-in-brief/isovaleric-acidaemia-iva-detailed-information

  If your baby does have IVA, the metabolic team will: […] start your baby on medical treatment and a special diet, which includes: […] medicines called L-carnitine and/or glycine, which help to reduce the level of isovaleric acid in the blood […] a restricted protein feeding plan […] a special feed to use during illnesses (called the emergency regimen) […] The metabolic team will see you regularly throughout your child’s life and your child will remain under their care. […] The aim of the feeding plan is to limit your baby’s protein intake in order to reduce the harmful build-up of isovaleric acid in the body. […] Your metabolic dietitian will teach you how much of each feed to give based on your baby’s weight. Following the dietetic instructions is very important for your baby’s health.

• #3 Hyperammonaemia in classic organic acidaemias: a review of the literature and two case histories | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-018-0963-7

  The acute management of hyperammonaemia in organic acidaemias requires administration of intravenous calories as glucose and lipids to promote anabolism, carnitine to promote urinary excretion of urinary organic acid esters, and correction of metabolic acidosis with the substitution of bicarbonate for chloride in intravenous fluids. It may also include the administration of ammonia scavengers such as sodium benzoate or sodium phenylbutyrate. Treatment with N-carbamyl-L-glutamate can rapidly normalise ammonia levels by stimulating the first step of the urea cycle. […] Current guidelines for managing OAs focus on PA and MMA. The initial aim of therapy is to reverse endogenous catabolism and provide sufficient energy to promote anabolism. Sufficient calories should be provided by intravenous glucose and lipids to prevent further catabolism, and metabolic acidosis can be corrected by substituting bicarbonate and acetate for chloride in intravenous (IV) solutions.

• #3 Isovaleric acidemia | Newborn Screening

  https://newbornscreening.hrsa.gov/conditions/isovaleric-acidemia

  It is important to talk to your health care provider about which treatment(s) are best for your baby. The goal of treatment is to prevent the health problems caused by this condition. […] Treatments may include the following: Frequent feedings to avoid long periods without food, Glycine supplements, L-carnitine supplements, Diet of special formulas or foods in some cases. […] Children who receive early and ongoing treatment for isovaleric acidemia can have healthy growth and development.

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