The table below shows the correlation between ECG changes and coronary territories:
| ECG changes | Coronary artery | |
|---|---|---|
| Anteroseptal | V1-V4 | Left anterior descending |
| Inferior | II, III, aVF | Right coronary |
| Anterolateral | V1-6, I, aVL | Proximal left anterior descending |
| Lateral | I, aVL +/- V5-6 | Left circumflex |
| Posterior | Changes in V1-3Reciprocal changes of STEMI are typically seen: | |
| • horizontal ST depression | ||
| • tall, broad R waves | ||
| • upright T waves | ||
| • dominant R wave in V2Posterior infarction is confirmed by ST elevation and Q waves in posterior leads (V7-9) | Usually left circumflex, also right coronary |
It should be remembered that a new left bundle branch block (LBBB) may point towards a diagnosis of acute coronary syndrome.
Diagram showing the correlation between ECG changes and coronary territories in acute coronary syndrome