B. Left circumflex – Explanation
These are classical findings of a circumflex occlusion. The table below shows how the changes
correspond to the cardiac anatomy:
| ST elevation greater in lead II than in lead III with abnormal Q waves in II, III, and aVF | Inferior infarction |
| Tall R waves in V1-2, tall and pointed T waves in V1V3 | Posterior infarction |
| ST elevation in V5-V6 | Lateral infarction |
ECG: coronary territories
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 | V4-6, I, aVL | Left anterior descending or left circumflex |
| Lateral | I, aVL +/- V5-6 | Left circumflex |
| Posterior | Tall R waves V1-2 | Usually left circumflex, also right coronary |
