Question

What leads correspond to the following arteries?

1) left anterior descending coronary artery
2) left circumflex coronary artery
3) posterior descending coronary artery
4) right main coronary artery

Answer 1

ECG leads corresponding to coronary arteries include V1-V4 for the Left Anterior Descending artery, I, aVL, V5, and V6 for the Left Circumflex artery, and leads II, III, and aVF for both the Posterior Descending artery and Right Coronary artery.

Step-by-step explanation:

The coronary arteries are vital for supplying blood to the myocardium, with specific leads on an electrocardiogram (ECG) correlating to these arteries:

1. Left Anterior Descending artery (LAD) - The ECG leads that correspond to the LAD are V1-V4, which are the precordial or chest leads. The LAD travels down the front of the heart and supplies blood to the front (anterior) part of the heart.
2. Left Circumflex artery - This artery supplies blood to the lateral side of the heart, with the corresponding ECG leads being I, aVL, V5, and V6.
3. Posterior Descending artery (PDA) - Correlated with the PDA, which supplies the back (posterior) of the heart, are leads II, III, and aVF on the ECG.
4. Right Coronary artery (RCA) - The ECG leads that generally correspond to the RCA are also II, III, and aVF, similar to the PDA, as the RCA often gives rise to the PDA.

The anastomoses formed between these arteries allow for blood circulation even if there is partial blockage in another branch.