How can lean thinking improve ERAS program in bariatric surgery?

Introduction: Enhanced recovery after bariatric surgery protocol (ERABS) decreased length of hospital stay (LOS) without influencing clinical outcomes. ERABS improved logistics aspects in operating room (OR) with OR time savings. Lean management was used to reorganize OR logistics and to improve its efficiency. This study analyzed clinical and OR logistic aspects in ERABS protocols.

Methods: Retrospective analysis of prospectively maintained database of obese patients undergoing bariatric surgery from 2017 to 2019 was performed. Since September 2018, patients were treated with ERABS protocol (ERABS group). All patients treated with a standard protocol between January 2017 and September 2018 (control group) were compared to ERABS group. Preoperative (anthropometric data, surgical and medical history) and intraoperative (type of procedure) were analyzed in two groups. LOS was the primary outcomes parameter analyzed; complications, readmissions and reoperations within 30 days were the secondary outcomes. Logistic endpoints were evaluated in time saving and efficiency: surgical time, team work time and total anesthesia time.

Results: 471 patients underwent bariatric surgery: 239 patients (control group) compared to 232 patients (ERABS group). ERABS presented more previous surgical history rate (p = 0.04) compared to control group with difference of type of procedure performed (p < 0.001). Roux-en-Y gastric bypass was mainly procedure in both groups (61.1% in control group compared to 52.6% in ERABS groups). Mean LOS was shorter in ERABS (3.16 days) compared to control group (4.81 days) with no difference in clinical outcomes rate. All logistics endpoints showed a time savings in ERABS group compared to control group (surgical procedure, total anesthesia and team work time, p < 0.001). In multivariate analysis, LOS was associated to ERAS status (IRR 0.722; p < 0.0001), team work time (IRR 1.002; p = 0.002), surgical procedure time (IRR 1.002; p < 0.0001). ERAS status was not associated with complication neither readmission, but surgical procedure time was a factor associated with complication (IRR 1.011; p = 0.0008).

Conclusion: This study confirmed that ERABS protocol is safe and a feasible alternative with improved LOS. OR reorganization and logistic efficiency achieved using lean management helped reduce all OR times and these are likely related to the improvement in LOS and complication.