Is CK-MB elevated in myocardial infarction?

Yes, CK-MB is elevated in myocardial infarction.

Creatine kinase-MB (CK-MB) is a cardiac enzyme that is released into the bloodstream when the heart muscle is damaged. This can occur in a variety of conditions, including myocardial infarction (heart attack), unstable angina, and myocarditis.

CK-MB levels typically begin to rise within 3-6 hours of a heart attack and peak within 24-48 hours. They then gradually decline over the next few days. The magnitude of the CK-MB elevation is proportional to the extent of heart muscle damage.

CK-MB is one of a number of cardiac biomarkers that are used to diagnose and monitor myocardial infarction. Other biomarkers include troponin I, troponin T, and myoglobin.