Final answer:
Elevated levels of creatine kinase MB (CK-MB) and cardiac troponin are commonly used blood tests to measure cardiac muscle fiber damage after a myocardial infarction (MI) or heart attack.
Step-by-step explanation:
Elevated levels of creatine kinase MB (CK-MB) and cardiac troponin are commonly used blood tests to measure cardiac muscle fiber damage after a myocardial infarction (MI) or heart attack. CK-MB is an enzyme that converts creatine to phosphocreatine, and its levels increase after damage to cardiac muscle cells. Cardiac troponin is a regulatory protein for muscle contraction and is released when cardiac muscle cells are damaged. These tests provide accurate measures of cardiac muscle fiber damage after an MI.