Predictors of Surgical Difficulty in Laparoscopic Total Mesorectal Excision

Concerns have been raised regarding the oncological safety of laparoscopic total mesorectal excision (TME) as compared to an open approach. This study aimed to identify risk factors for surgically difficult laparoscopic TME. All consecutive laparoscopic rectal cancer cases were included from a prospectively maintained colorectal cancer database. The primary outcome was to identify risk factors for surgically difficult TME. A Surgical Difficulty Risk Score (SDRS) between 0 and 6 was calculated for each case with cases achieving an SDRS of 2 or greater being deemed as surgically difficult. A total of 2795 consecutive cases of laparoscopic TME were identified, with 464 (16.6%) surgically difficult cases. Univariate analysis found that operating in the male pelvis, performing abdomino-perineal resections, Hartmann's procedures, and proctocolectomies were all significantly associated with higher operative difficulty (P < 0.001). A higher nodal stage of cancer (P = 0.046), and the resection of another organ (P = 0.003) were significantly associated with higher surgical difficulty. On multivariate analysis, a female pelvis was associated with a favorable laparoscopic resection (Odds ratio [OR] 0.54, 95% CI 0.43-0.67, P < 0.001), whereas patients who had another organ resection (OR 2.6, 95% CI 1.53-4.42, P < 0.001), nodal positivity (OR 1.37, 95% CI 1.11-1.69, P = 0.003), and high ASA scores had more difficult surgeries. Predictive factors for surgically difficult laparoscopic TME include male gender, high ASA scores, mid and low rectal cancer, positive nodal stage, and resection of another organ at time of surgery.