<prompt> Answer this question truthfullyWhat is the name of the cardiac biomarker that is helpful in detecting reinfarction following an acute myocardial infarction MI?  <response>: <reason> The cardiac biomarker that is useful in detecting reinfarction following an acute MI is CK-MB. CK-MB stands for creatine kinase-MB and is a type of enzyme that is found predominantly in cardiac muscle cells. When heart muscle cells are damaged or die during an acute MI, CK-MB is released into the bloodstream and can be detected using blood tests. CK-MB levels in the blood peak within 12-24 hours of an acute MI and return to normal within 2-3 days. In cases of reinfarction, CK-MB levels may rise again, indicating further damage to the heart muscle. CK-MB is one of several cardiac biomarkers that can be used to diagnose and monitor acute MI, along with troponin and myoglobin. 