True about subendocardial haemorrhage is all except-
**Subendocardial Haemorrhage**
**Core Concept**
Subendocardial hemorrhage refers to the collection of blood within the subendocardial layer of the heart, which is the innermost layer of the heart muscle. This condition occurs due to the rupture of small blood vessels in the subendocardial layer, leading to bleeding into the myocardium. The subendocardial layer is particularly susceptible to ischemia and hypoxia, making it a common site for hemorrhage in conditions such as myocardial infarction.
**Why the Correct Answer is Right**
Subendocardial hemorrhage is often associated with conditions that cause increased pressure within the coronary sinus, such as hypertension, myocardial infarction, or cardiac tamponade. The increased pressure can lead to the rupture of small blood vessels in the subendocardial layer, resulting in bleeding. The subendocardial layer is also rich in capillaries, making it more prone to hemorrhage. The hemorrhage can lead to further damage to the heart muscle and potentially compromise cardiac function.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because subendocardial hemorrhage can occur in conditions that cause increased pressure within the coronary sinus, such as hypertension. While hypertension is not the only cause, it is a possible underlying condition.
**Option B:** Incorrect because subendocardial hemorrhage is a known complication of myocardial infarction, where the increased pressure within the coronary sinus can lead to rupture of small blood vessels.
**Option C:** Incorrect because cardiac tamponade can cause increased pressure within the coronary sinus, leading to subendocardial hemorrhage.
**Clinical Pearl / High-Yield Fact**
One important thing to remember is that subendocardial hemorrhage is often associated with conditions that cause increased pressure within the coronary sinus, making it a potential complication of conditions such as hypertension, myocardial infarction, and cardiac tamponade.
**Correct Answer:** A.