• Ahmed R Ahmed, Danilo Miskovic, Thormela Vijayaseelan, William O'Malley, and George B Hanna.
• Department of Surgery and Cancer, Imperial College London, London, United Kingdom. ahmed.ahmed@imperial.nhs.uk
• Surg Obes Relat Dis. 2012 Mar 1;8(2):158-63.

BackgroundInternal hernia (IH) and Roux limb compression (RC) are recognized complications after retrocolic laparoscopic Roux-en-Y gastric bypass for obesity. The aim of the present study was to systematically identify the surgical technical errors leading to these complications.MethodsAn observational clinical human reliability assessment approach was used to analyze the operating videos of 3 groups: an IH group (n = 12), a Roux compression group (n = 13), and a control group (no complications, n = 21). Two investigators, unaware of the outcomes, reviewed all videos, using special rating software. All errors were categorized using the external error mode system and further described if a direct consequential error (e.g., bleeding) was found.ResultsAn analysis of data showed that, on average, more errors occurred in the complication groups than in the control group (IH 5.85, Roux compression 3.54, control .90, P < .001). The strongest differences were found for missing intermesenteric stitches on both sides of the Roux limb. Logistic regression analysis showed that a missed stitch between the mesentery of the Roux limb and the transverse mesocolon was an independent predictor for IH (B = 1.727, P = .025). No technical or consequential errors could be identified as responsible for RC.ConclusionThe observational clinical human reliability analysis is a useful method to identify operative failure. For retrocolic, retrogastric laparoscopic Roux-en-Y gastric bypass, a systematic approach for the closure of the transverse mesenteric window might prevent IH complications.Copyright © 2012 American Society for Metabolic and Bariatric Surgery. Published by Elsevier Inc. All rights reserved.

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