Who it is for
Simpler and faster to perform than Roux-en-Y, with comparable weight-loss and metabolic outcomes in well-selected patients. Similar indications to standard Roux-en-Y gastric bypass.
The single-anastomosis design appeals to patients who want the metabolic benefits of a bypass with a technically simpler operation and shorter operating time.
How the operation is performed
Laparoscopically. A long, narrow stomach pouch is created (similar shape to a sleeve but closed off at the bottom). A loop of small intestine is brought up and joined to the pouch in a single connection, bypassing roughly 150–200 cm of intestine.
Typical weight loss and outcomes
Weight loss and metabolic outcomes are broadly comparable to Roux-en-Y gastric bypass in well-selected patients. Operative time and technical complexity are lower.
Recovery
Similar to Roux-en-Y: 2–3 day hospital stay; the same staged diet progression over the first month.
Bile reflux: a specific consideration
Because of the single-loop design, some patients experience bile-reflux symptoms (burning behind the breastbone, bitter taste, heartburn). This is a specific point of discussion in consultation; OAGB may not be the right choice for patients with pre-existing severe reflux.
Long-term commitments
Same supplementation and follow-up schedule as Roux-en-Y: daily multivitamin, B12, iron, calcium + D.