**Colonic Pseudo-obstruction**

**Core Concept**
Colonic pseudo-obstruction, also known as Ogilvie syndrome, is a condition characterized by a mechanical obstruction of the colon without any physical blockage. It is often associated with autonomic dysfunction, electrolyte imbalances, and decreased gut motility.

**Why the Correct Answer is Right**
Colonic pseudo-obstruction is a clinical syndrome that mimics the symptoms of a true mechanical obstruction, such as abdominal distension, nausea, vomiting, and abdominal pain. The condition is often seen in critically ill patients, particularly those with neurological disorders, such as Parkinson's disease, or those who have undergone recent surgery. The pathophysiology involves an imbalance of the autonomic nervous system, leading to abnormal gut motility.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because colonic pseudo-obstruction can occur in patients with Parkinson's disease, which is a neurodegenerative disorder that affects the autonomic nervous system.
**Option B:** This option is incorrect because pseudo-obstruction can be caused by electrolyte imbalances, such as hypokalemia, which can lead to decreased gut motility.
**Option C:** This option is incorrect because colonic pseudo-obstruction can occur in patients with recent abdominal surgery, which can lead to autonomic dysfunction and decreased gut motility.

**Clinical Pearl / High-Yield Fact**
Colonic pseudo-obstruction is often managed with bowel rest, correction of electrolyte imbalances, and administration of medications that stimulate gut motility, such as neostigmine or metoclopramide.

**Correct Answer: D.**