Patient is having normal CK & CKMB after 2 days of chest pain which of the following is true-
A significant concentration of CK-MB isoenzyme is found almost exclusively in the myocardium, and the appearance of elevated CK-MB levels in serum is highly specific and sensitive for myocardial cell wall injury. Normal reference values for serum CK-MB range from 3 to 5% (percentage of total CK) or 5 to 25 IU/L.if theses are normal then the MI diagnosis can be excluded Ref Davidson edition23rd pg 440
C.V.S
Excludes diagnosis of MI
Reperfusion after MI
Extracardiac source of pain
Cardiac surgery
Excludes diagnosis of MI