All are true about ischemic colitis except :
**Core Concept**
Ischemic colitis is a condition characterized by inflammation of the colon due to reduced blood flow, often caused by a sudden decrease in blood pressure, cardiac arrest, or atherosclerosis. This condition can lead to mucosal damage and potentially life-threatening complications.
**Why the Correct Answer is Right**
The correct answer will be an option that is not true about ischemic colitis. Ischemic colitis usually presents with symptoms such as abdominal pain, diarrhea, and bloody stools. The condition can be classified into different grades based on the severity of the damage, ranging from non-specific inflammation to full-thickness necrosis. The pathophysiology involves an imbalance between the oxygen demand and supply of the colonic mucosa, leading to ischemia and subsequent damage.
**Why Each Wrong Option is Incorrect**
**Option A:** Ischemic colitis is often associated with atherosclerosis, which can cause a reduction in blood flow to the colon. Therefore, this statement is true and not incorrect.
**Option B:** This option is incorrect because ischemic colitis typically presents with symptoms such as abdominal pain and bloody stools, rather than a sudden onset of severe diarrhea.
**Option C:** This statement is not true about ischemic colitis. The condition is not usually associated with a sudden increase in blood flow to the colon, but rather a reduction in blood flow.
**Option D:** This statement is not true about ischemic colitis. The condition is often caused by atherosclerosis, cardiac arrest, or other conditions that reduce blood flow to the colon, rather than an increase in blood pressure.
**Clinical Pearl / High-Yield Fact**
One important clinical pearl to remember is that ischemic colitis can mimic other conditions such as inflammatory bowel disease (IBD), making it essential to consider this diagnosis in patients presenting with abdominal pain and bloody stools.
**Correct Answer:** D.