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6 documented risks. Severity reflects clinical significance, not probability.
Staple line leak
severe1.50% (0.50–3.00%)Prevention: Reinforced staple line; intra-operative leak test; experienced surgeon volume.
Sources: ifso-bariatric-standards
Bleeding requiring re-operation
severe1.00% (0.50–2.00%)Prevention: Meticulous haemostasis; intra-operative pressure check.
Sources: ifso-bariatric-standards
Stricture (gastric narrowing)
moderate2.00%Prevention: Bougie sizing standards; avoidance of over-tight resection at incisura.
Sources: ifso-bariatric-standards
Deep vein thrombosis / pulmonary embolism
severe0.50%Prevention: Mechanical and pharmacological prophylaxis; early mobilisation.
Sources: nice-ng89-venous-thromboembolism
Long-term reflux (GORD) — may require conversion
moderate20.00% (10.00–30.00%)Prevention: Pre-operative assessment of reflux; consideration of bypass if pre-existing GORD.
Sources: ifso-bariatric-standards
Vitamin B12 / iron deficiency long-term
minor30.00%Prevention: Lifelong vitamin supplementation and annual blood monitoring.
Sources: ifso-bariatric-standards