| Surface of Left Ventricle | EKG Leads | Coronary Artery Usually Involved |
|---|---|---|
| Inferior | II, III, aVF | Right coronary artery (RCA) |
| Lateral | V5-V6, I, aVL | Left circumflex (CIRC) |
| Anterior | V2-V4 | Left anterior descending (LAD) |
| Anterior lateral | V1-V6, I, aVL | Left main coronary artery (L MAIN) |
| Septal | V1-V2 | Left anterior descending (LAD) |
| Posterior | V1-V2 | Left circumflex or right coronary artery (reciprocal changes) |
| V7-V9 (direct) |
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Wednesday, August 31, 2011
Correlations Among Ventricular Surfaces, EKG Leads, & Coronary Arteries
Below is a table which list corresponding surface area of the heart with EKG leads and the coronary artery usually involved. The location of infarction is determined by correlating the ECG leads with Q waves and the ST-segment T-wave abnormalities. Infarction most commonly affects the left ventricle and the interventricular septum; however, the right ventricle can be infracted, and many patients who sustain an inferior MI have some right ventricular damage. The ECG manifestations that are used to diagnose an MI and pinpoint the area of damaged ventricle include inverted T waves, ST-segment elevation, and pathologic Q waves in specific lead groupings as described subsequently.
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