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Background and Aims: Early enteral nutrition (EEN) after surgery should be preferred to parenteral feeding, but its clinical use is limited for concerns about possible gastrointestinal (GI) adverse effects and feeding tube-related complications. Thus we evaluated our experience focusing on safety and tolerance of early postoperative jejunal feeding and possible risk factors for gastrointestinal adverse effects., Methods: 650 subjects treated with EEN after major digestive surgery for cancer were prospectively studied. EEN was started within 12 hours after operation via a naso-jejunal (NJ) feeding tube or a catheter-feeding jejunostomy. The rate of infusion was progressively increased to reach the nutritional goal (25 kcal/kg/day) within the 4th postoperative day. Rigorous treatment protocols for diet delivery and EEN-related GI adverse effects were applied., Results: 402 patients had a jejunostomy and 248 patients a NJ tube. EEN-related GI adverse effects were observed in 194/650 patients (29.8%). In 136/194 patients, these events were successfully handled by treatment protocols. Overall the nutritional goal was achieved in 592/650 patients (91.1%). Fifty-eight (8.9%) subjects had to be switched to parenteral feeding because of refractory intolerance to EEN. Intra-abdominal surgical complications and low serum albumin (<30 g/L) were the two major factors affecting tolerance. Severe jejunostomy-related complications occurred in 7/402 (1.7%) patients. EEN-related mortality was 0.1% (1/650)., Conclusions: The use of the gut early after surgery is safe and well-tolerated and it should represent the first choice for nutritional support in this type of patients., (Copyright 2002 Elsevier Science Ltd. All rights reserved.)