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4.17 Inborn Errors of Metabolism II
By Dr. Marble
69
Pathology
Professional
04/22/2012

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Term
What enzyme is deficient in Von Gierke disease?
Definition
glucose 6-phosphatase deficiency
Term
What are the symptoms of von gierke disease?
Definition
hypoglycemia, lactic acidosis, hyperuricemia, hyperlipidemia
Term
What is GSD 1a?
Definition
von gierke disease
Term
What is GSD type 1b?
Definition
glucose-6-P translocase def
Term
What are the features of glucose-6-P translocase def.?
Definition
hypoglycemia, lactic acidosis, hyperuricemia, hyperlipidemia, neutropenia, hepatomegally, weakness, facial features
Term
Which glycogen storage diseases are associated with puffy cheeks?
Definition
GSDIa (von gierke) and GSD1b
Term
What is GSD II?
Definition
Pompei disease
Term
What is GSD III?
Definition
debrancher deficiency
Term
What is GSD IV?
Definition
brancher deficiency
Term
What is GSD VI?
Definition
McCardle disease
Term
How do you treat Von Gierke's disorder?
Definition
nocturnal NG feedings, avoid fasting
Term
How do you treat GSD Ib?
Definition
nocturnal NG feedings, avoid fasting, neutropenia precaution
Term
What is the typical presentation of Pompei diesase?
Definition
weakness, hypotonia, cardiomyopathy
Term
What are the EKG findings of Pompei?
Definition
short PR intervals, wide QRS
Term
How do you treat pompei's disease?
Definition
enzyme replacement
Term
What is the typical presentation of debrancher deficiency?
Definition
hepatomegaly, hyperuricemia, hyperlipidemia: normal lactate
Term
What are the symptoms of brancher deficiency?
Definition
fatal liver disease (amylopectinosis)
Term
How is debrancher deficiency treated?
Definition
nocturnal NG feedings, avoid fasting
Term
How is brancher deficiency treated?
Definition
transplant
Term
How is McCardle disease treated?
Definition
avoid excess exercise to prevent rhabdomyolysis
Term
Which glycogen storage disease only affects the muscle?
Definition
McCardle disease
Term
What kind of disorders are mucopolysaccharidosis?
Definition
lysosomal storage diseases
Term
What is MPS I?
Definition
Hurler syndrome
Term
What are the symptoms of Hurler syndrome?
Definition
developmental regression, large head, coarse facies, corneal clouding, hepatosplenomegaly, dysostosis multiplex
Term
What is the treatment for Hurler syndrome?
Definition
BMT, enzyme replacement
Term
What are the lab findings of Hurler syndrome?
Definition
dermatan and heparan sulfate in urine
Term
What is the inheritance pattern of Hurler syndrome?
Definition
autosomal recessive
Term
What enzyme is deficient in Hurler syndrome?
Definition
alpha L-iduronidase deficiency
Term
What is Hurler-Scheie syndrome?
Definition
a milder form of Hurlers that has symptoms such as corneal clouding, characeteristic facial features, joint contractures, short stature, mitral valve prolapse, and learning problems
Term
Irregular, bullet-shaped metacarpals are characteristic of...
Definition
Hurler disease
Term
Broad ribs are characteristic of...
Definition
Hurler disease
Term
What is MPS II?
Definition
Hunter syndrome
Term
What is the deficient in Hunter syndrome?
Definition
iduronate sulfatase
Term
What are the lab findings of hunter syndrome?
Definition
dermatan and heparan sulfate in urine
Term
What is the difference between Hunter and Hurler?
Definition
hunter has no corneal clouding and has x-linked inheritance instead of AR
Term
What is MPS 3?
Definition
sanfilipo syndrome
Term
What are the symptoms of Sanfilipo?
Definition
less severe somatic features, developmental delay, behavioral problems, neurological regression (normal until 5 years of age then regression)
Term
What are the symptoms of Morquio syndrome?
Definition
short stature, joint laxity, multiple skeletal deformity, odontoid hypoplasia
Term
What is MPS IV?
Definition
morquio syndrome
Term
WHat is MPS VI?
Definition
Maroteaux lamy
Term
What are the symptoms of Maroteaux lamy?
Definition
hurler-like skeletal features, dysostosis multiplex, relative sparing of CNS
Term
How do you treat maroteaux lamy?
Definition
BMT, enzyme replacement with synthetic protein with mannose 6-phophate residues fo rlysosomal targeting (weekly 4 hour infusions)
Term
What type of disease is Neimann-Pick?
Definition
glycolipidosis (a type of lysosomal storage disease)
Term
What are the features of glycolipidosis?
Definition
developmental regressiona nd neurological problems starting in infancy, cherry red macula, hepatosplenomegaly
Term
How do you diagnose Neimann-Pick Disease type A?
Definition
foam cells; sphingomyelinase assay
Term
Name the disorders associated with a cherry red macula.
Definition
Neimann-Pick A, GM1 gangliosidosis, Tay-Sachs disease, Sandhoff disease, Farber lipogranulomatosis, sialidosis
Term
Tay Sachs is due to a defiency in..
Definition
hexosaminidase A
Term
What are the symptoms of Tay Sachs?
Definition
onset 3-5 months, hypotonia, motor weakness, exaggerated startle to noise, cherry red macula, reapid decline (blindness, deafness, decerebrate)
Term
What is the neonatal presentation of GM1 gangliosidosis?
Definition
hypotonia, ascites
Term
What are the symptoms of metachromatic leukodystrophy?
Definition
rapid developmental regression starting in late infancy
Term
What is the pathophysiology of metachromatic leukodystrophy?
Definition
lysosomal accumulation of sulfatides
Term
What type of disease is alpha mannosidosis?
Definition
glycoprotein degredation disorder
Term
How do you treat Gaucher disease?
Definition
ERT, BMT
Term
What are the symptoms of peroxisomal biogenesis disorder (Zellweger spectrum)?
Definition
hypotonia, developmental delay, poor feeding poor growth
Term
What are the lab values associated with peroxisome disorder?
Definition
elevated very long chain fatty acids, elevated pristanic acid and phytanic acid, elevated bile acid intermediates, elevated pipecolic acid, decreased plasmalogens
Term
What are the lab values associated with D-bifunctional protein deficiency?
Definition
elevated very long chain fatty acids, elevated bile acid intermediates, elevated phytanic and pristanic acids, normal plasmalogens, normal pipecolic acid
Term
What screening tests should you order for peroxisomal disorders?
Definition
very long chain fatty acids, phytanic acids, plasmalogens, bile acid intermediates, pipecolic acid
Term
What is the inheritance pattern of MELAS?
Definition
mitochondrial
Term
What are the findings associated with MELAS?
Definition
myoclonic epilepsy, lactic acidosis stroke-like episodes
Term
What are the findings associated with MERRF?
Definition
myoclonic epilepsy with ragged red fibers
Term
What is the inheritance pattern of NARP?
Definition
mitochondrial
Term
What are the findings associated with NARP?
Definition
neuropathy, ataxia, retinitis pigmentosa
Term
Nonsyndromic deafness/diabetes is associated with what kind of inheritance?
Definition
mitochondrial
Term
What is the inheritance pattern of Kearn Sayres?
Definition
mitochondrial
Term
What is the inheritance pattern of Pearson syndrome?
Definition
mitochondrial
Term
What is the inheritance pattern of Leigh syndrome?
Definition
mitochondrial
Term
Mitochondrial disorders caused by mutations in nucear encoded genes are associated with what type of inheritance?
Definition
autosomal recessive
Term
What are the lab findings associated with Smith-Lemli-Opitz syndrome?
Definition
low choelsterol, elevated 7-dehydrocholesterol
Term
What are the symptoms of Smith-Lemli-Opitz syndrome?
Definition
poor feeding, pyloric stenosis, failure to thrive, syndactyly of 2nd and third toes; polydactyly, cleft palate, pyloric stenosis, heart defects, ambiguous genitalia, mental retardation
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