Robotic vs laparoscopic right colectomy - the burden of age and comorbidity in perioperative outcomes: An observational study.

BACKGROUND Several studies have shown the safety, feasibility and oncologic adequacy of robotic right hemicolectomy (RRH). Laparoscopic right hemicolectomy (LRH) is considered technically challenging. Robotic surgery has been introduced to overcome this technical limitation, but it is related to high costs. To maximize the benefits of such surgery, only selected patients are candidates for this technique. In addition, due to progressive aging of the population, an increasing number of minimally invasive procedures are performed on elderly patients with severe comorbidities, who are usually more prone to post-operative complications. AIM To investigate the outcomes of RRHvsLRH with regard to age and comorbidities. METHODS We retrospectively analyzed 123 minimally invasive procedures (68 LRHsvs55 RRHs) for right colon cancer or endoscopically unresectable adenoma performed in our Center from January 2014 until September 2019. The surgical procedures were performed according to standardized techniques. The primary clinical outcome of the study was the length of hospital stay (LOS) measured in days. Secondary outcomes were time to first flatus (TFF) and time to first stool evacuation. The robotic technique was considered the exposure and the laparoscopic technique was considered the control. Routine demographic variables were obtained, including age at time of surgery and gender. Body mass index and American Society of Anesthesiologists physical status were registered. The age-adjusted Charlson Comorbidity Index (ACCI) was calculated; the tumor-node-metastasis system, intra-operative variables and post-operative complications were recorded. Post-operative follow-up was 180 d. RESULTS LOS, TFF, and time to first stool were significantly shorter in the robotic group: Median 6 [interquartile range (IQR) 5-8]vs7 (IQR 6-10.5) d,P= 0.028; median 2 (IQR 1-3)vs3 (IQR 2-4) d,P< 0.001; median 4 (IQR 3-5)vs5 (IQR 4-6.5) d,P= 0.005, respectively. Following multivariable analysis, the robotic technique was confirmed to be predictive of significantly shorter hospitalization and faster restoration of bowel function; in addition the dichotomous variables of age over 75 years and ACCI more than 7 were significant predictors of hospital stay. No outcomes were significantly associated with Clavien-Dindo grading. Sub-group analysis demonstrated that patients aged over 75 years had a longer LOS (median 6 -IQR 5-8-vs7 -IQR 6-12- d,P= 0.013) and later TFF (median 2 -IQR 1-3-vs3 -IQR 2-4- d,P= 0.008), while patients with ACCI more than 7 were only associated with a prolonged hospital stay (median 7 -IQR 5-8-vs7 -IQR 6-14.5- d,P= 0.036). CONCLUSION RRH is related to shorter LOS when compared with the laparoscopic approach, but older age and several comorbidities tend to reduce its benefits.