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Gastric Sleeve (Sleeve Gastrectomy) — risks and complications

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