**Question:** Dumping syndrome occurs least with which surgical procedure?

**Core Concept:** Dumping syndrome is a complication that can occur after partial gastrectomy, where the ingested food passes rapidly into the small intestine, leading to symptoms like flushing, diarrhoea, and hypoglycaemia due to the release of incretins.

**Why the Correct Answer is Right:** Roux-en-Y gastric bypass (RYGB) is considered the least likely to cause dumping syndrome because it preserves the majority of the stomach and the majority of the small bowel. This prevents the rapid transit of food and the subsequent release of incretins.

**Why Each Wrong Option is Incorrect:**

A. Total gastrectomy: This procedure involves the complete removal of the stomach, causing the complete disruption of the normal gastroduodenal circulation and leading to a high incidence of dumping syndrome.
B. Total gastrectomy with Billroth-I anastomosis: This procedure involves an end-to-side gastrojejunostomy, which also disrupts the normal gastroduodenal circulation and increases the risk of dumping syndrome.
C. Total gastrectomy with Billroth-II anastomosis: This procedure connects the stomach to the jejunum, allowing for rapid transit and incretin release.
D. Roux-en-Y gastric bypass: As mentioned earlier, this procedure preserves the majority of the stomach and the majority of the small bowel, reducing the risk of dumping syndrome.

**Clinical Pearl:** Dumping syndrome is a significant concern in patients undergoing partial gastrectomy and Billroth-I or Billroth-II anastomosis procedures. Roux-en-Y gastric bypass is considered a less likely cause due to preserving the majority of the stomach and small bowel.

**Core Concept:** Roux-en-Y gastric bypass is a less likely cause of dumping syndrome due to preserving the majority of the stomach and small bowel.

**Why the Correct Answer is Right:** Dumping syndrome occurs when food bypasses the stomach and causes rapid transit through the small intestine, leading to incretin release and symptoms. Roux-en-Y gastric bypass, however, preserves most of the stomach and small bowel, preventing the rapid transit and subsequent dumping syndrome.

**Why Each Wrong Option is Incorrect:**

A. Total gastrectomy: This procedure removes the stomach entirely, causing rapid transit and incretin release, increasing the risk of dumping syndrome.
B. Total gastrectomy with Billroth-I anastomosis: This procedure connects the stomach to the jejunum, leading to rapid transit and incretin release, increasing the risk of dumping syndrome.
C. Total gastrectomy with Billroth-II anastomosis: This procedure also connects the stomach to the jejunum, resulting in rapid transit and incretin release, increasing the risk of dumping syndrome.
D. Roux-en-Y gastric bypass: As explained, this procedure preserves the majority of the stomach and small bowel, reducing the risk of dumping syndrome.