A 60 year old man presents with chest pain which last 6 hours and is diagnosed as acute myocardial infarction. Angiography showed involvement of anterior descending branch of left coronary artery The most probable site of infarct is-
**Core Concept**
The anterior descending branch of the left coronary artery supplies blood to a significant portion of the left ventricle, making it a crucial artery for cardiac function. The territory supplied by this artery is typically associated with a specific pattern of myocardial infarction.
**Why the Correct Answer is Right**
The anterior descending branch of the left coronary artery primarily supplies the anterior wall and the anterolateral wall of the left ventricle, including the apex. This area is often referred to as the "anterior wall" or "anterolateral wall." The involvement of this artery, as seen in the case, would likely result in an infarct in the anterolateral wall. The mechanism of ischemia and infarction in this region is related to the occlusion of the anterior descending branch, leading to a lack of blood flow and subsequent damage to the myocardium.
**Why Each Wrong Option is Incorrect**
**Option B:** The posterior wall of the left ventricle is typically supplied by the right coronary artery, making it less likely to be involved in an infarction of the anterior descending branch of the left coronary artery.
**Option C:** The inferior wall of the left ventricle is usually supplied by the right coronary artery, which is not directly related to the anterior descending branch of the left coronary artery.
**Option D:** The septal wall of the left ventricle is supplied by both the left anterior descending and the left circumflex arteries. While the left anterior descending artery is involved, the septal wall is not the most probable site of infarction.
**Clinical Pearl / High-Yield Fact**
In patients with acute myocardial infarction, the location of the infarct can often be inferred from the coronary artery involved. Knowledge of the coronary circulation and the areas supplied by each artery is crucial for accurate diagnosis and management.
**✓ Correct Answer: A. Anterolateral wall**