Gastric bypass criteria for effectiveness.

Weight loss patterns and revision rates in three sequential groups of patients with gastric bypasses and loop gastroenterostomies between 1965 and 1978 demonstrate the importance of a 50 ml volume of the upper segment measured at 25 to 30 cm water luminal pressure and a 10 to 12 mm diameter stoma. The need for a secure partition is well known. Reinforcement of the stoma to prevent dilation has contributed greatly to the success of gastroplasty and should be studied in gastric bypass. The importance of quality control and of both revision rate and weight patterns over five to ten years is emphasized.