Learning Curve and Surgical Outcome for Robotic-Assisted Hysterectomy with Lymphadenectomy: Case-Matched Controlled Comparison with Laparoscopy and Laparotomy for Treatment of Endometrial Cancer

Abstract Study Objective To determine the learning curve for robotic-assisted hysterectomy with lymphadenectomy for surgical treatment of endometrial cancer. Design An analysis of robotic-assisted hysterectomy with lymphadenectomy vs total laparoscopic hysterectomy with lymphadenectomy and laparotomy with total abdominal hysterectomy with lymphadenectomy (Canadian Task Force classification II-1). Setting Solo, experienced, minimally invasive gynecologic oncology practice in a tertiary hospital. Patients One hundred forty-eight patients including 56 patients who underwent robotic-assisted hysterectomy with bilateral pelvic and paraaortic lymph node dissection, 56 patients who underwent total laparoscopic hysterectomy with bilateral pelvic and paraaortic lymph node dissection, and 36 patients who underwent traditional total abdominal hysterectomy with bilateral pelvic and paraaortic lymph node dissection performed by the same surgeon for treatment of endometrial cancer. Interventions Robotic-assisted hysterectomy with bilateral lymphadenectomy, total laparoscopic hysterectomy with bilateral lymphadenectomy, and traditional total abdominal hysterectomy with bilateral lymphadenectomy were performed. Data were categorized by chronologic order of cases into groups of 20 patients each. The learning curve of the surgical procedure was estimated by measuring operative time with respect to chronologic order of each patient who had undergone the respective procedure. Measurements and Main Results For the 3 surgical procedures, data analyzed included mean age, body mass index, operative time, blood loss, lymph node retrieval, and complications. Mean (SD); 95% confidence interval [CI]) operative time for the 3 procedures was statistically significant: 162.5 (53) minutes (95% CI, 148.6–176.4]), 192.3 (55.5) minutes (95% CI, 177.6–207.0), and 136.9 (32.3) minutes (95% CI, 126.3–147.5), respectively. Analysis of operative time for robotic-assisted hysterectomy with bilateral lymph node dissection with respect to chronologic order of each group of 20 cases demonstrated a decrease in operative time: 183.2 (69) minutes (95% CI; 153.0–213.4) for cases 1 to 20, 152.7 (39.8) minutes (95% CI, 135.3–170.1) for cases 21 to 40, and 148.8 (36.7) minutes (95% CI, 130.8–166.8) for cases 41 to 56. For the groups with laparoscopic hysterectomy with lymphadenectomy and traditional total abdominal hysterectomy with lymphadenectomy, there was no difference in operative time with respect to