Gangrene of intestine is seen in all the following conditions, except –
**Core Concept**
Gangrene of the intestine, also known as intestinal infarction or ischemic bowel disease, is a condition characterized by the death of intestinal tissue due to a lack of oxygen and nutrient supply. This can occur due to various reasons such as vascular occlusion, embolism, or thrombosis. The underlying pathophysiology involves the disruption of the normal blood flow to the intestines, leading to tissue necrosis.
**Why the Correct Answer is Right**
The correct answer is related to the conditions that typically cause intestinal gangrene. Intestinal gangrene is commonly seen in conditions such as mesenteric artery thrombosis, embolism, or vasculitis. It can also occur in conditions like abdominal aortic aneurysm, which can cause compression or thrombosis of the adjacent mesenteric arteries. In these conditions, the reduction in blood flow to the intestines leads to ischemia and ultimately gangrene.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while it is a cause of intestinal ischemia, it is not a direct cause of gangrene.
**Option B:** This option is incorrect because, although it can cause intestinal ischemia, it is not a typical cause of gangrene.
**Option C:** This option is incorrect because it is a cause of intestinal obstruction, not gangrene. Intestinal obstruction can lead to ischemia, but it is not a direct cause of gangrene.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that intestinal gangrene can occur in conditions that affect the blood supply to the intestines, such as mesenteric artery thrombosis, embolism, or vasculitis. In cases of suspected intestinal gangrene, prompt surgical intervention is often necessary to prevent further complications and mortality.
**Correct Answer:** D