Today, Dr. Abhishek Shukla explained how a heart attack (acute myocardial infarction) is diagnosed using a combination of clinical symptoms, ECG findings, and cardiac biomarkers. The most critical ECG finding is ST-segment elevation in specific leads corresponding to the affected coronary artery territory. When a patient presents with acute chest pain, radiation to the arm or jaw, sweating, or breathlessness, the ECG is immediately evaluated. If ST elevation or new-onset left bundle branch block