What Is the Relationship between Operative Time and Adverse Events after Colon and Rectal Surgery?

We propose that prolonged colorectal surgery operative times are associated with increased 30-day adverse events. We identified a cohort from the American College of Surgeons National Surgical Quality Improvement Program (NSQIP) from January 2005 through December 2012. Patients who underwent colectomy with primary anastomosis were selected using CPT codes. Operative time was categorized into short, average, and long based on mean operative times ±1 SD. NSQIP-approved multivariate models were used to identify associations between operative time and 30-day adverse events. A total of 113,615 patients underwent colorectal resection of which 46 per cent were laparoscopic and 12 per cent were identified as long operative times. Patients with long operative procedures had 34 per cent more superficial surgical site infections, 65 per cent more organ space infections, 69 per cent more abdominal dehiscences, 44 per cent more thrombotic complications, 45 per cent more urinary tract infections, 40 per cent more returns to the operating room, and 36 per cent more prolonged lengths of stay (P < 0.05 for all analyses). The multivariable analysis revealed an association between long operative times and increased adverse events despite adjustment for all NSQIP recommended covariates. Our results reveal increased 30-day adverse events with increased operative time. We propose that operative time may serve as a proxy for surgical complexity in colorectal surgery.