Incidence and Risk Factors for Anastomotic Leakage in Colorectal Surgery: A Historical Cohort Study

Anastomotic leakage (AL) is a major complication following colorectal surgery, with many risk factors established to date. The incidence of AL varies in the medical literature and is dependent on research inclusion criteria and diagnostic criteria.

To determine the incidence of and the potential risk factors for AL following colorectal surgery at a single academic medical center.

We retrospectively reviewed all operative reports of colorectal procedures that included bowel resection and primary bowel anastomosis performed at Sheba Medical Center during 2012. AL was defined according to the 1991 United Kingdom Surgical Infection Study Group criteria. Data were assessed for leak incidence within 30 days. In addition, 17 possible risk factors for leakage were analyzed. A literature review was conducted.

This cohort study comprised 260 patients, and included 261 procedures performed during the study period. The overall leak rate was 8.4%. In a univariate analysis, male sex (odds ratio [OR] 3.37, 95% confidence interval [95%CI] 1.21-9.43), pulmonary disease (OR 3.99, 95%CI 1.49-10.73), current or past smoking (OR 2.93, 95%CI 1.21-7.10), and American Society of Anesthesiologist score ≥ 3 (OR 3.08, 95%CI 1.16-8.13) were associated with an increased risk for anastomotic leakage. In a multivariate analysis, male gender (OR 3.62, 95%CI 1.27-10.33) and pulmonary disease (OR 4.37, 95%CI 1.58-12.10) were associated with a greater risk.

The incidence of AL in the present study is similar to that found in comparable series. Respiratory co-morbidity and male sex were found to be the most significant risk factors.