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Roux-en-Y Gastric Bypass

Creation of a small gastric pouch with Roux limb for restrictive and malabsorptive weight loss.

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Genel Cerrahi department. Book Appointment →

What is Roux-en-Y Gastric Bypass?

Roux-en-Y gastric bypass creates a small (~30 mL) gastric pouch anastomosed to a Roux limb of jejunum, bypassing the distal stomach, duodenum, and proximal jejunum.

Mechanism combines restriction (small pouch), malabsorption (bypassed proximal small bowel), and significant neurohormonal changes (GLP-1, PYY, ghrelin, bile acids, microbiome).

Particularly effective for type 2 diabetes remission (60–80% at 2 years) and severe GERD, making it preferred over sleeve gastrectomy in these contexts per ASMBS/IFSO 2022.

Typical excess weight loss is 60–80% at 2 years with durable improvement in diabetes, hypertension, dyslipidemia, obstructive sleep apnea, and quality of life.

Symptoms

Indications for gastric bypass:
BMI ≥40 kg/m² or BMI ≥35 with comorbidities
Severe GERD with obesity (bypass preferred over sleeve)
Type 2 diabetes with obesity — highly effective for remission
BMI ≥30 kg/m² with uncontrolled metabolic disease
Failure of conservative weight management

Risk Factors

Anastomotic leak (1–2%) at gastrojejunostomy or jejunojejunostomy
Internal hernia (2–5% lifetime risk — closure of mesenteric defects essential)
Dumping syndrome (early and late) with high-carbohydrate meals
Nutritional deficiencies — B12, iron, calcium, vitamin D, thiamine, folate, protein
Marginal ulcer at gastrojejunal anastomosis
Cholelithiasis from rapid weight loss

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Severe obesity with metabolic syndrome or poorly controlled T2DM
  • GERD with severe obesity requiring bariatric surgery
  • Multidisciplinary bariatric program evaluation

Treatment Methods

01
Laparoscopic Roux-en-Y gastric bypass with 100–150 cm Roux limb
02
Closure of Petersen's and mesenteric defects to prevent internal hernia
03
Preoperative endoscopy, H. pylori eradication, nutritional assessment
04
Postoperative staged diet advancement and proton pump inhibitor for marginal ulcer prevention
05
Lifelong vitamin/mineral supplementation: daily multivitamin, B12 injections, iron, calcium citrate, vitamin D
06
Long-term follow-up with labs, DEXA, and bariatric team for weight, nutrition, and psychosocial support

Which Department to Visit?

You can visit our Genel Cerrahi department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.