Key Points
- Review the role of electrocardiogram patterns in diagnosing acute coronary syndromes, estimating patient risk, and guiding emergent catheterization laboratory activation.
- Synthesized consensus guidelines analyzing alterations in QRS complexes, ST segments, and T waves during suspected acute coronary events.
- Evaluated diagnostic features distinguishing epicardial occlusion and transmural ischemia from subendocardial ischemia and nonischemic mimics across symptomatic and asymptomatic states.
- ST segment elevation alongside ST depression in leads V1–V3 indicates acute epicardial artery occlusion and transmural ischemia, mandating emergent reperfusion triage.
- ST depression outside leads V1–V3 signals subendocardial ischemia resulting from partial occlusion, distal embolization, or supply-demand mismatch, though nonischemic conditions like left ventricular hypertrophy can produce identical patterns.
- Serial electrocardiographic monitoring and comparison against baseline tracings resolve ambiguous presentations and prevent inappropriate catheterization laboratory activation.
Structured PICO
PPopulationPatients presenting with symptoms compatible with acute coronary syndrome
IInterventionElectrocardiogram (ECG) interpretation
The ECG remains a critical tool for diagnosing acute coronary syndromes, estimating risk, and guiding emergent reperfusion therapy, though clinical context is essential for accurate interpretation.