What is the main cause of abdominal distention in a patient with intestinal obstruction?
**Core Concept**
Abdominal distention in intestinal obstruction is primarily caused by the accumulation of gas and fluid within the obstructed bowel segment. This leads to increased intra-abdominal pressure, which can be life-threatening if not promptly addressed.
**Why the Correct Answer is Right**
The accumulation of gas and fluid is due to the cessation of normal bowel motility and the inability of the bowel to propel contents past the obstruction. This results in a buildup of swallowed air, swallowed saliva, and intestinal secretions, which can lead to significant abdominal distention. The increased pressure can also lead to venous congestion and potentially compromise arterial blood flow to the affected bowel segment.
**Why Each Wrong Option is Incorrect**
**Option A:** Inflammatory response is a secondary consequence of intestinal obstruction, not the primary cause of abdominal distention.
**Option B:** Bowel ischemia is a potential complication of intestinal obstruction but is not the main cause of abdominal distention.
**Option C:** Electrolyte imbalance can occur in intestinal obstruction but is not directly responsible for abdominal distention.
**Clinical Pearl / High-Yield Fact**
In cases of suspected intestinal obstruction, early recognition and prompt surgical intervention can help prevent complications such as bowel ischemia and perforation. A high index of suspicion for intestinal obstruction is essential, especially in patients with a history of abdominal surgery, previous bowel disease, or signs of abdominal pain, vomiting, and obstipation.
**Correct Answer: C.**