Systematic Review and Meta-Regression of Factors Affecting Midline Incisional Hernia Rates: Analysis of 14,618 Patients

David C Bosanquet, James Ansell, Tarig Abdelrahman, Julie Cornish, Rhiannon Harries, Amy Stimpson, Llion Davies, James C D Glasbey, Kathryn A Frewer, Natasha C Frewer, Daphne Russell, Ian Russell, Jared Torkington, David C Bosanquet, James Ansell, Tarig Abdelrahman, Julie Cornish, Rhiannon Harries, Amy Stimpson, Llion Davies, James C D Glasbey, Kathryn A Frewer, Natasha C Frewer, Daphne Russell, Ian Russell, Jared Torkington

Abstract

Background: The incidence of incisional hernias (IHs) following midline abdominal incisions is difficult to estimate. Furthermore recent analyses have reported inconsistent findings on the superiority of absorbable versus non-absorbable sutures.

Objective: To estimate the mean IH rate following midline laparotomy from the published literature, to identify variables that predict IH rates and to analyse whether the type of suture (absorbable versus non-absorbable) affects IH rates.

Methods: We undertook a systematic review according to PRISMA guidelines. We sought randomised trials and observational studies including patients undergoing midline incisions with standard suture closure. Papers describing two or more arms suitable for inclusion had data abstracted independently for each arm.

Results: Fifty-six papers, describing 83 separate groups comprising 14,618 patients, met the inclusion criteria. The prevalence of IHs after midline incision was 12.8% (range: 0 to 35.6%) at a weighted mean of 23.7 months. The estimated risk of undergoing IH repair after midline laparotomy was 5.2%. Two meta-regression analyses (A and B) each identified seven characteristics associated with increased IH rate: one patient variable (higher age), two surgical variables (surgery for AAA and either surgery for obesity surgery (model A) or using an upper midline incision (model B)), two inclusion criteria (including patients with previous laparotomies and those with previous IHs), and two circumstantial variables (later year of publication and specifying an exact significance level). There was no significant difference in IH rate between absorbable and non-absorbable sutures either alone or in conjunction with either regression analysis.

Conclusions: The IH rate estimated by pooling the published literature is 12.8% after about two years. Seven factors account for the large variation in IH rates across groups. However there is no evidence that suture type has an intrinsic effect on IH rates.

Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Fig 1. PRISMA diagram detailing search strategy…
Fig 1. PRISMA diagram detailing search strategy and study selection process.
Fig 2. Funnel plot of IH rates…
Fig 2. Funnel plot of IH rates (y axis) by number of patients in study (x axis).
Notes: Created using Excel macro at www.apho.org.uk/resource/view.aspx?RID=47241. Dashed boundaries show ± three standard errors; feint show ± two standard errors.
Fig 3. Bubble plot of IH rates…
Fig 3. Bubble plot of IH rates by year of publication.
Notes: The area of each circle is proportionate to the number of patients. The line of best fit shows that IH rates increase with year of publication.

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