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Gastric bypass is an extensive gastric exclusion operation used in patients who are more than twice their ideal weight. Most of the early postoperative deaths observed in 3% of 442 patients during the initial 9 years, could have been prevented by more attention to operative technique and early recognition and correction of leaks when they occurred. The best weight loss can be produced by adherence to three components of the operation: 1) Bypass of stomach and duodenum, 2) a small fundic segment and 3) a small (12 mm diameter) gastroenterostomy stoma. The average patient of 142 kg can expect to have a weight of around 107 kg at 1 year 103 kg at 5 years. Revision of a large stoma to a smaller (9 mm) diameter can induce further weight loss in some patients whose loss has been inadequate. The 1.8% incidence of stoma ulceration may be lowered with the present emphasis on a smaller fundic pouch, but could increase with longer observation. Presently stoma ulcers occur once in every 140 patient years at risk.
Mason et al. (1975) studied this question.