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Term 1, Biochem Lecture #10
Markers for Myocardal Infarctions
20
Medical
Graduate
09/11/2009

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Term
Isozymes
Definition
Enzymes that catalyze the same rxn but have a different amino acid sequence
Term
The 3 markers for a myocardial infarction and their half lives
Definition
CK (early, 18hrs), AST (late, 1 day for cytosolic) and LDH (late, 5 days)
Term
The 3 isozymes of Creatine Kinase
Definition
CK-BB (CK-1), CK-BM (CK-2), CK-MM (CK-3)
Term
CK-BB
Definition
Known as CK-1, is present in the brain and intestinal smooth muscle, and does not accumulate in the serum
Term
CK-MB
Definition
Known as CK-2, comprises ~30% of CK myocardium, accounts for the 5% elevation in blood after an MI
Term
CK-MM
Definition
Known as CK-3, found mainly in skeletal muscle (~98% isozyme), Muscular dystrophy and Rhabdomyolosis lead to ~5% elevated serum levels of isozyme
Term
24hrs after an MI, which CK isozymes are elevated in serum
Definition
CK-MM>>>CK-MB>CK-BB
Term
Determining the severity of an MI
Definition
The percentage of CK-MB of total CK
Term
This value is indicative of an MI
Definition
A 5% serum increase in CK-MB indicates this
Term
Three proteins that increase in serum hours after an MI
Definition
cTroponin-I, cTroponin-T, Myoglobin (nonspecific)
Term
These proteins can be measured in the serum even days after an MI
Definition
cTroponin-I, cTroponin-T
Term
Which markers can be used to show an MI days after the incident
Definition
cTroponin-I, cTroponin-T and LDH
Term
The subunits of LDH
Definition
H & M are the subunits of this enzyme
Term
The 5 isozymes of LDH
Definition
LDH-1 (H4), LDH-2 (H3M), LDH-3 (H2M2), LDH-4 (HM3), LDH-5 (M4)
Term
The LDH isozymes that can be used as MI markers
Definition
LDH-1 (H4), LDH-2 (H3M)
Term
The LDH isozymes that can be used as hepatitis markers
Definition
LDH-5 (M4)
Term
This is very important to pay attention to when using LDH markers for MIs
Definition
The ratio between LDH-1:LDH-2
Term
The normal serum ratio show for LDH isozymes
Definition
Low LDH-1:LDH-2
Term
Liver fxn tests measure this
Definition
Biliary-excretory ability is meaured by this test
Term

4 markers for liver damage

Definition

1. Alanine aminotransferase (ALT),

2. Aspartate aminotransferase (AST),

3. Alkaline phosphatase (ALP),

4. γ-glutamyltranspeptidase (GGT)

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