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Pediatric Board Review
Metabolic Disorders
37
Biology
Professional
07/28/2013

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Term
Metabolic conditions that present as chronic encephalopathy
Definition
Homocysteinuria, PKU
Slowly progressive
Term
Metabolic conditions that present as fasting hypoglycemia
Definition
Fatty acid oxidation disorders, GSD, mitochondrial disorders
Term
Diagnosis of MSUD
Definition
Plasma amino and urine organic acids, metabolic acidosis with ketones, increased anion gap
Term
Diagnosis of OTC deficiency
Definition
Hyperammonemia, milkd metabolic acidosis, respiratory alkalosis
Term
Diagnosis of organic acid diseases
Definition
Metabolic acidosis with ketones, plasma ammonium, abnormal urine organic acids, increased anion gap
Term
Diagnosi of galactosemia, fructose intolerance
Definition
Newborn screening, urine organic acids, elevated liver enzymes
Term
Presentation of fatty acid oxidation
Definition
Hypoketotic hypoglycemia, hypotonia, cardiomyopathy, SIDS
Term
Presentation of glycogen storage disease
Definition
Hepatomegaly, hypoglycemia, lactic acidosis, failure to thrive
Term
Presentation of Mitochondrial disorders
Definition
Lactic acidosis, seizures, cardiomyopathy, hypotonia, occasional hypoglycemia
Term
Lysosomal storage diseases
Definition
Mucopolysaccharidoses, Gaucher disease, Niemann-Pick, Tay-Sachs, Fabry
Term
Peroxisomal storage diseases
Definition
Zellweger, X-linked adrenoleukodystrophy, Mevalonate kinase, rhizomelic chondrodysplasia punctata
Term
Intracellular processing defects
Definition
Menkes, Wilsons, Hemochromatosis, alpha-1-antitrypsin, congenital glycosylation
Term
Inborn errors of cholesterol synthesis
Definition
Smith-Lemli-Opitz, hypercholesterolemia, Tangiers
Term
Maple syrup urine disease
Definition
CNS disease, poor feeding, loss of reflexes, seizures, defect in oxidative decarboxylation of ketoacids. Increased leucine, isoleucine and valine in plasma and urine. Dietary control
Term
Glutaric aciduria and Menkes disease
Definition
Can cause subdural hematomas and retinal hemorrhages can be mistaken for child abuse
Term
Nonketotic hyperglycinemia
Definition
AR
Intractable seizure, hiccups in utero, hypotonia, MR. Treat with sodium benzoate
Term
Isovaleric acidemia
Definition
AR
Encephalopathy, increased levels of isovaleryl co-A, severe metaboic acidosis, ketosis, sweaty feet smell
Term
Long chain (LCHAD) deficiency
Definition
Fasting hypoketotic hypoglycemia, cardiomyopthy, cholestatic liver disease, retinopathy
Term
MCAD deficiency
Definition
Fasting hypoglycemia, seizures, elevated liver enzymes and CPK, toxic buildup of medium chain fatty acids, newborn screening
Term
Type I GSD: Von Gierke Disease
Definition
defect in glucose-6-phosphatase in liver, kidney, intestine. Fasting hypoglycemia, hepatomegaly, FTT, seizures, normal spleen and heart, hyperuricemia, hypertriglyceridemia, elevated lactate, ESRD, hepatocellular carcinoma
Term
Type III GSD: Debrancher deficiency
Definition
AR
hepatomegaly, hypoglycemia, short stature, cardiomyopathy
Term
Type V GSD: McArdle Disease
Definition
Glycogen accumulation, exercise induced muscl cramps, exercise intolerance, myoglobinuria, CPK elevation
Term
Type II GSD: Pompe Disease
Definition
Actually a lysosomal storage disease. Glucosidase deficiency. Cardiomegaly, hypotonia, weakness, elvated CPK, AST and LDH. Treated with enzyme replacement therapy
Term
Gaucher disease
Definition
Ashkenazi jews, nonneuropathic form, responds to enzyme replacement, lysosomal glucocerebrosidase deficiency
Term
Type XI GSD: Renal Fanconi Syndrome (Fanconi Bickel Syndrome)
Definition
AR
renal tubular dysfunction, accumulation of glycogen in liver and kidney, associated with consanguinity
Term
Galactosemia
Definition
AR
Galactose-1-phosphate uridyl transferase deficiency
Must restrict lactose intake
Jaundice, hepatosplenomegaly, hypoglycemia, cataracts, MR, vomiting, seizures, poor weight gain, E. coli sepsis, reducing substances in urine, NBS
Remember lactose=glucose + galactose
Term
Hereditary fructose intolerance
Definition
Accumulation of fructose-1-phosphate, appears like galactosemia with hypoglycemia, liver and kidney failure
Term
Hurler syndrome
Definition
alpha-L-iduronidase
Coarse facial features, mid-face hypoplasia, large tongue, URIs, umbilical hernia, large head, hepatosplenomegaly, cardiac disease
BMT or enzyme replacement therapy
Term
Hunter syndrome
Definition
x-linked
Milder than Hurlers, no corneal clouding, learning disability, hernia, coarse facial features, hepatosplenomegaly, distinctive rash
Term
Niemann-Pick disease
Definition
cholesterol accumulation
ataxia, hepatosplenomegaly, motor movement problems, narcolepsy, cataplexy
Term
Tay-sachs disease
Definition
B-hexosaminidase
Loss of motor skills, macular cherry-red spot, seizures, intention tremor
Term
Fabry disease
Definition
x-linked recessive
episodic pain, hypohydrosis, corneal opacities, renal disease, stroke
Require enzyme replacement therapy
Term
X-linked metabolic disorders
Definition
OTC deficieny, Fabry, Hunters, Menkes, sideroblastic anemia, Lesch-Nyhan
Term
Conditions that present with hypotonia at birth
Definition
Prader-Willi, Trisomy 21, Zellwegers
Term
Zellweger syndrome
Definition
Spectrum
Neonatal adrenoleukodystrophyloss of skills, dysmorphic features, hearing loss, vision loss, very long chain fatty acid abnormalities
Term
Menkes disease
Definition
x-linkd
Impaired copper uptake
hypothermia, hypotonia, hypoglycemia, kinky hair, seizures, subdural hematomas and retinal hemorrhages
Term
Conditions covered by NBS
Definition
amino acid defects, fatty acid oxidation, galactosemia, hemoglobinopathies, CAH, congenital hypothryoidism, CF
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