In MI, which enzyme is raised in 4 to 6 hrs and decreases in 3 to 6 days -

Ans. is 'c' i.e., CPKCreatinine phosphokinase (CK) Previously It was the gold standard marker of acute Ml.o But now it has largely been replaced by troponin T and I (see above explanation).o But, CK remains the best alternative to troponin measurement.CK-MB isotype of this enzyme is specific for myocardium.It is raised within 2-4 hours after MI, peaks at 24 hours and returns to normal within approximately 72 hours.