Occlusion of the LAD will lead to infarction of which area
**Core Concept**
The left anterior descending (LAD) artery is a critical branch of the left coronary artery that supplies blood to the anterior wall of the left ventricle, the anterior two-thirds of the interventricular septum, and the apex of the heart. Occlusion of the LAD can lead to myocardial infarction (MI) in the areas supplied by this artery.
**Why the Correct Answer is Right**
The LAD artery runs anteriorly along the anterior wall of the left ventricle and supplies blood to the anterior two-thirds of the interventricular septum. The anterior wall of the left ventricle and the anterior two-thirds of the interventricular septum are at risk of infarction if the LAD is occluded. This is because the LAD is the primary blood supply to these areas, and occlusion of the artery will lead to ischemia and subsequent infarction.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the LAD does not supply blood to the posterior wall of the left ventricle. The posterior descending artery (PDA) or the right coronary artery (RCA) typically supplies blood to the posterior wall of the left ventricle.
* **Option B:** This option is incorrect because the LAD does not supply blood to the right ventricle. The right coronary artery (RCA) or the left circumflex artery (LCx) typically supplies blood to the right ventricle.
* **Option D:** This option is incorrect because the LAD does not supply blood to the left atrium. The left atrium is supplied by branches of the left circumflex artery (LCx) or the right coronary artery (RCA).
**Clinical Pearl / High-Yield Fact**
Remember that the LAD is a critical artery that supplies blood to a significant portion of the left ventricle. Occlusion of the LAD can lead to a large anterior MI, which can be life-threatening if not promptly treated.
**Correct Answer:** C.