• D A Jacob, J A Hackl, R Bittner, B Kraft, and F Köckerling.
• Department of Surgery and Center for Minimally Invasive Surgery, Academic Teaching Hospital of Charité Medical School, Vivantes Hospital, Neue Bergstraße 6, 13585, Berlin, Germany.
• Surg Endosc. 2015 Dec 1; 29 (12): 3733-40.

IntroductionFollowing repair of a unilateral inguinal hernia, there is a risk of 1% per year of onset of an inguinal hernia on the other side. Comparison of bilateral with unilateral TAPP operation in a high-volume center found that morbidity and reoperation rates were only marginally higher for bilateral TAPP operation. Some authors are calling for prophylactic operation of the contralateral side.MethodsBetween September 2009 and April 2013, data were entered into the Herniamed Registry on 15,176 patients who had undergone TAPP operation. Of these patients, 10,887 had been operated on because of a unilateral (71.7%) and 4289 because of a bilateral (28.3%) inguinal hernia.ResultsA significant difference was noted in the rate of postoperative complications occurring within 30 days, which was 4.9% for bilateral compared with 3.9% for unilateral inguinal hernia (p = 0.009). The postoperative complications necessitated reoperation in 0.9% of patients after unilateral and in 1.9% of patients after bilateral inguinal hernia repair, thus attesting to the significantly higher risk presented by bilateral inguinal hernia repair (p = <0.001).Multivariate analysis confirmed the highly significant influence of bilateral TAPP on increased reoperation rates due to complications (p > 0.0001). The odds ratio was 2.13 (95% CI 1.58-2.86). Comparison of the results from a high-volume center with those from the Herniamed Registry showed that perioperative complication rates were markedly higher.ConclusionPerioperative outcome of bilateral TAPP operation demonstrates significantly worse postoperative complication and reoperation rates compared with unilateral TAPP. Likewise, the results were markedly unfavorable compared with those of a high-volume center. If a bilateral hernia repair should be attempted in those patients with only a unilateral hernia, these data give the surgeon more information on how to better prepare a patient and obtain consent preoperatively.

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