# Situation: A 34-year-old woman with a body mass index (BMI) of 42 kg/m², hypertension, and obstructive sleep apnea treated with continuous positive airway pressure (CPAP) undergoes laparoscopic Roux-en-Y gastric bypass. She has no diabetes. On the first postoperative day, a clear liquid diet is started. Which instruction should the nurse give her?

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> subject: Nursing Practice IV — Care of Clients with Problems in Nutrition and Gastrointestinal, Metabolism and Endocrine, Perception and Coordination

## 문제

Situation: A 34-year-old woman with a body mass index (BMI) of 42 kg/m², hypertension, and obstructive sleep apnea treated with continuous positive airway pressure (CPAP) undergoes laparoscopic Roux-en-Y gastric bypass. She has no diabetes.

On the first postoperative day, a clear liquid diet is started. Which instruction should the nurse give her?

## 보기

1. Drink sweetened juice to regain energy quickly
2. Choose a carbonated drink to ease the gas pain
3. Take slow, small sips of about 30 mL at a time **✔ 정답**
4. Finish each 240-mL cup within about 10 minutes

**정답: 3**

## 해설

After gastric bypass, the new stomach pouch holds only about 30 mL at first. Clear liquids are taken in small, slow sips to prevent vomiting and strain on the staple lines. Carbonated drinks distend the pouch, and sugary drinks can cause dumping because food now empties directly into the jejunum.

## 심화 해설

Core postoperative physiology After laparoscopic Roux-en-Y gastric bypass, the stomach is divided to create a very small proximal pouch that initially holds only about 30 mL. The jejunum is connected directly to this pouch, so ingested liquid bypasses the pylorus and the remainder of the stomach. On the first postoperative day, the priority is to protect the fresh anastomosis and staple lines from distention, vomiting, and rapid osmotic shifts.

The safest initial oral intake is slow, small sips of approximately 30 mL at a time. This volume matches the capacity of the new pouch and reduces intraluminal pressure. Rapid or large-volume intake can distend the pouch, trigger nausea and vomiting, and increase tension on the staple line, which raises the risk of early complications such as bleeding or leak [2].

Watch out! Sweetened juice is not appropriate. After gastric bypass, hyperosmolar fluids empty rapidly into the jejunum because the pyloric barrier is bypassed. This rapid delivery of concentrated sugar can provoke early dumping syndrome, with vasomotor and gastrointestinal symptoms [1][3]. Even though some patients later interpret dumping as a behavioral signal to avoid high-sugar foods [4], in the immediate postoperative period it is an avoidable stressor that should not be deliberately induced.

Key point! Carbonated beverages are avoided because carbon dioxide gas expands the small pouch, causing distention, pain, and pressure on the anastomosis. A 240-mL cup finished within 10 minutes is also too fast and too large for the initial pouch capacity; it would overwhelm the pouch and increase the risk of vomiting.

| Instruction | Why it is correct or incorrect | Postoperative risk |
| --- | --- | --- |
| Drink sweetened juice to regain energy quickly | Hyperosmolar sugar enters jejunum rapidly | Early dumping syndrome, fluid shift, tachycardia, nausea |
| Choose a carbonated drink to ease gas pain | Gas expands the small pouch | Pouch distention, staple-line tension, pain |
| Take slow, small sips of about 30 mL at a time | Matches initial pouch capacity and slows emptying | Lowest risk; protects anastomosis |
| Finish each 240-mL cup within about 10 minutes | Volume and rate exceed pouch capacity | Vomiting, pouch strain, possible leak |

The rationale for small, slow sips is both mechanical and metabolic. Mechanically, the pouch must not be stretched while the staple line is fresh. Metabolically, limiting the rate and concentration of oral intake reduces the chance of a hyperosmolar load reaching the jejunum, which is the trigger for early dumping [1][3]. Nutritional complications after RYGB, including dumping and hypoglycemia, can present with nonspecific symptoms and may be underrecognized, so prevention through controlled early feeding is clinically important [3].

Dumping syndrome after gastric bypass occurs because the pylorus no longer regulates gastric emptying. When concentrated carbohydrate reaches the small bowel quickly, fluid shifts from the intravascular space into the intestinal lumen, producing abdominal cramping, flushing, dizziness, and diarrhea [1][3]. Although one qualitative study found that some patients reframe early dumping as a useful feedback mechanism for dietary control years after surgery [4], this does not change the immediate postoperative nursing goal of avoiding symptom provocation while the anastomosis heals.

Key point! On postoperative day 1, the nurse should teach the patient to sip clear liquids slowly, about 30 mL at a time, and to stop if fullness, nausea, or epigastric pressure develops. This instruction directly protects the fresh gastric pouch and jejunal anastomosis from distention and reduces the likelihood of early dumping [1][2][3].References (research sources)

- [1]Nutritional Challenges and Treatment After Bariatric Surgery.Research articleMoize V, Laferrère B, Shapses S (2024) · DOI: 10.1146/annurev-nutr-061121-101547

- [2]Early and Late Complications After Sleeve Gastrectomy and Roux-en-Y Gastric Bypass: A Narrative Review.Research articleKim SH, Oh SJ. (2026) · DOI: 10.17476/jmbs.2026.15.2.59

- [3][Many complications after Roux-en-Y gastric bypass surgery can be prevented and treated].Research articleGribsholt SB, Richelsen B (2016)

- [4]Early dumping syndrome is not a complication but a desirable feature of Roux-en-Y gastric bypass surgery.Research articleLaurenius A, Engström M (2016) · DOI: 10.1111/cob.12158

## 임상 시나리오

Post-Gastric Bypass Clear Liquid IntakeProtecting the new pouch and anastomosis on POD 1
The new gastric pouch holds only about 30 mL initially. Instruct the patient to take slow, small sips of about 30 mL at a time to avoid vomiting and staple-line strain.

Avoid sweetened juice because hyperosmolar fluid rapidly enters the jejunum and can trigger early dumping syndrome with vasomotor and GI symptoms.

Avoid carbonated drinks because gas expands the pouch, causing distention, pain, and pressure on the anastomosis.

CautionDo not encourage finishing a 240-mL cup quickly; large or rapid volume intake can distend the pouch and increase tension on the staple line, raising the risk of bleeding or leak.

## 핵심 개념

- **Dumping syndrome** — Rapid emptying of hyperosmolar gastric contents into the jejunum, causing vasomotor and GI symptoms; common after gastric bypass when the pylorus is bypassed.
- **Gastric pouch** — Small proximal stomach remnant created during Roux-en-Y gastric bypass, initially holding about 30 mL.
- **Staple line** — Suture/staple closure of stomach tissue after bariatric surgery; vulnerable to distention, vomiting, and leakage in the early postoperative period.
- **Anastomosis** — Surgical connection between the gastric pouch and jejunum in Roux-en-Y bypass; must be protected from pressure and distention.
- **Roux-en-Y gastric bypass** — Bariatric procedure dividing the stomach into a small pouch and connecting it directly to the jejunum, bypassing the pylorus and duodenum.

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