What is the technique for creating a Braun anastomosis (side‑to‑side jejuno‑jejunostomy) distal to a Billroth II or gastro‑jejunostomy?

Braun Anastomosis Technique

A Braun anastomosis is a side-to-side jejuno-jejunostomy created between the afferent (biliopancreatic) and efferent (alimentary) limbs distal to a Billroth II gastrojejunostomy or gastrojejunostomy, typically performed 10-40 cm distal to the gastric anastomosis to reduce bile reflux and prevent afferent loop syndrome.

Anatomical Configuration

The Braun enteroenterostomy creates a communication between two jejunal limbs in Billroth II reconstruction:

• Afferent limb – carries bile and pancreatic secretions from the duodenal stump 1
• Efferent limb – the alimentary channel receiving gastric contents 1
• Anastomotic location – positioned 10-40 cm distal to the gastrojejunostomy, though optimal distance remains debated 2

Technical Execution

Standard Approach

• Create a side-to-side anastomosis between the afferent and efferent jejunal loops using either hand-sewn or stapled technique 3
• Position the anastomosis sufficiently distal to the gastrojejunostomy to allow bile diversion away from the gastric remnant 4
• Ensure adequate length of both limbs to prevent tension on the anastomosis 2

Novel R Anastomosis Technique

A modified approach for laparoscopic cases has been described:

• Reduces anastomotic time by approximately 6 minutes compared to conventional technique (30 vs 36 minutes, p<0.001) 2
• Standardizes anastomotic site and direction to improve technical consistency 2
• Decreases postoperative gastric emptying dysfunction compared to conventional Braun anastomosis 2

Clinical Rationale and Evidence

Theoretical Benefits

The Braun anastomosis aims to:

• Divert bile away from the gastric remnant by creating an alternative pathway for biliopancreatic secretions 1
• Reduce afferent loop syndrome by decompressing the afferent limb 3
• Prevent delayed gastric emptying by facilitating drainage 3

Actual Clinical Outcomes

Short-term benefits (first postoperative year):

• Bile reflux reduction – 75.9% with Braun vs 86.2% without (p=0.019) 4
• Decreased heartburn – 12.0% with Braun vs 20.1% without (p=0.047) 4
• Reduced medication use – lower prokinetic and acid reducer requirements 4

Long-term outcomes (beyond 1 year):

• No sustained benefit – bile reflux rates equalize between groups after the first year 4
• No difference in gastritis or residual food at 2-3 years follow-up 5, 4
• Comparable nutritional outcomes and body mass index between groups 4

Meta-Analysis Findings

The most recent systematic review (2026) demonstrates:

• No reduction in overall bile reflux – RR 0.95 (95% CI: 0.76-1.18) 1
• Borderline early benefit – RR 0.57 for early postoperative bile reflux (95% CI: 0.32-1.01) 1
• No difference in anastomotic complications – bleeding RR 0.94, fistula RR 1.17 1
• Increased operative time – mean difference 19.07 minutes (95% CI: 4.76-33.38) 1

Specific Applications

After Whipple Procedure

• Reduced afferent loop syndrome when added to standard pancreaticoduodenectomy 3
• Lower delayed gastric emptying rates – 2 cases with Braun vs 3 without in small trial 3
• Overall complication reduction – 26.7% with Braun vs 46.7% without (p=0.14, not statistically significant) 3

After Distal Gastrectomy

• Shorter operative time than Roux-en-Y – 134.6 minutes vs 157.3 minutes (p<0.010) 5
• Lower ileus rate than Roux-en-Y – 0% with Braun vs 10% with Roux-en-Y 5
• Comparable bile reflux to Roux-en-Y – 28% vs 17.2% at 6 months (p=0.343) 5

Critical Pitfalls and Limitations

Technical Considerations

• Avoid excessive tension on the anastomosis by ensuring adequate mobilization of both limbs 2
• Standardize anastomotic distance from gastrojejunostomy to optimize outcomes 2
• Consider patient-specific factors including anatomy and prior surgical history 1

Evidence Limitations

• Benefits are transient – advantages disappear after the first postoperative year 4
• Adds operative time without proven long-term benefit 1
• No impact on major complications including anastomotic leak or bleeding 1
• Routine use not supported by current meta-analytic evidence 1

Contemporary Perspective

The routine addition of Braun anastomosis to Billroth II reconstruction cannot be recommended based on current evidence, as it increases operative time without providing sustained clinical benefits beyond the first postoperative year 1, 4. The procedure may be considered selectively in patients at high risk for afferent loop syndrome or when performing pancreaticoduodenectomy 3, but should not be performed as a default modification 1.

For patients requiring reconstruction after distal gastrectomy, Roux-en-Y remains superior to Billroth II with or without Braun anastomosis for reducing bile reflux and improving functional outcomes 6.