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11 Cards in this Set

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  • Back
CPK & CK Clinical Implications
Myocardial Infarction
What are CPK & CK
Enzymes found in heart, skeletal muscle and brain tissue. Used to assess myocardium and muscle damage.
CPK is divided into 3 enzymes
MM- Skeletal muscle
BB- brain tissue
MM & MB- cardiac muscle
Isoenzyme studies for CPK do what?
Determine if the CPK is from the heart(MB) or muscle(MM)
What does elevation of MB indicate?
Most definitive indication of myocardial cell damage.
In acute MI, what does the CK/CPK do?
Begins to increase in 2-4 hours, usually returns to normal w/in 24-48 hours.
Interfering factors for CPK & CK
Exercise, salicylates, childbirth, multiple injections, athletes have higher value from increased muscle mass
What are Troponins?
Assay can detect MI w/ greater sensitivity and specificity.
troponin T(cTNT) & troponin I (cTNI)
What are normal levels of Troponins?
Very low.
Increases substantially 4-6 hours post muscle damage, peaks at 10-24 hours and can be detected for up to a week.
Uses for BNP?
B-type Natriutetic protein
Used to diagnose CHF, ventricles produce extra BNP when can't pump enough to meet body needs.
Higher values = heart failure
What is C-reactive proteins?
MI precurser.
Increase significant for suspected risk of MI.