Cardiac biomarkers are substances that are released into the bloodstream in response to cardiac injury or stress. These biomarkers can be used to diagnose and monitor various cardiovascular conditions, such as heart attacks and heart failure, as well as to assess the risk of future cardiovascular events. Key cardiac biomarkers include troponin, creatine kinase-MB, myoglobin, and brain natriuretic peptide (BNP). Monitoring these biomarkers can help healthcare providers make timely and accurate decisions regarding the diagnosis, treatment, and prognosis of patients with heart disease.