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Cardiac Enzyme Studies
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Healthwise
Test Overview
Cardiac enzyme studies measure the levels of the enzyme creatine phosphokinase (CPK, CK) and the protein troponin (TnI, TnT) in the blood. Low levels of these enzymes and proteins are normally found in your blood, but if your heart muscle is injured, such as from a heart attack, the enzymes and proteins leak out of damaged heart muscle cells, and their levels in the bloodstream rise.
Because some of these enzymes and proteins are also found in other body tissues, their levels in the blood may rise when those other tissues are damaged. Cardiac enzyme studies must always be compared with your symptoms, your physical examination findings, and electrocardiogram (EKG, ECG) results.
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Last Updated:
September 13, 2007- Author:
- Maria G. Essig, MS, ELS
Robin Parks, MS - Medical Review:
- E. Gregory Thompson, MD - Internal Medicine
Stephen Fort, MD, MRCP, FRCPC - Interventional Cardiology
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