Minimally invasive right colectomy anastomosis study (MIRCAST): protocol for an observational cohort study of surgical complications using four surgical techniques for anastomosis in patients with a right colon tumor

Short-term morbidity and mortality after right hemicolectomy: an update of national performance in the Netherlands

AIM

The purpose of this Dutch retrospective population-based study was to evaluate how short-term outcomes and inter-hospital variability after right hemicolectomy for colon cancer have evolved between 2012 and 2020.

METHOD

Patients who underwent right hemicolectomy for primary solitary colon cancer between 1 January 2012 and 31 December 2020 and were registered in the Dutch Colorectal Audit were included. Surgical characteristics and outcomes were assessed during three time periods (2012-2014, 2015-2017, 2018-2020). Complications and mortality were the primary outcomes, and reintervention, readmission and length of stay secondary outcomes.

RESULTS

In total, 29 274 patients were included. Significant increase in minimally invasive surgery (51.1% 2012-2014, 73.2% 2015-2017, 85.0% 2018-2020), increase in conversion (6.6%, 7.8%, 9.1%, P < 0.001) and decrease in acute/urgent resections (15.9%, 11.7%, 10.9%, P < 0.001) were found. The overall complication rate was slightly lower in the third period (30.9%, 30.6%, 28.8%, P = 0.004), primarily because of decreasing non-surgical complications (19.7%, 20.6%, 17.6%, P < 0.001), while surgical complications remained unchanged (17.5%, 18.3%, 18.2%, P = 0.277). Postoperative mortality was 3.4%, 2.3% and 3.5%, respectively. Reintervention rate slightly decreased (9.4%, 8.3%, 8.6%, P < 0.001). The proportion of patients admitted for more than 6 days decreased over time (54.3%, 42.4%, 34.3%, P < 0.001), with an increase in readmission rate (7.4%, 6.8%, 9.3%, P < 0.001). Inter-hospital variability decreased over time for complications, length of stay and conversion.

CONCLUSION

This study shows a national decreasing inter-hospital variability in clinical outcomes after right hemicolectomy and a decrease in postoperative complications. Despite increasing use of laparoscopy, surgical complications and mortality remained stable over time.

Early outcomes from the Minimally Invasive Right Colectomy Anastomosis study (MIRCAST)

BACKGROUND

The impact of method of anastomosis and minimally invasive surgical technique on surgical and clinical outcomes after right hemicolectomy is uncertain. The aim of the MIRCAST study was to compare intracorporeal and extracorporeal anastomosis (ICA and ECA respectively), each using either a laparoscopic approach or robot-assisted surgery during right hemicolectomies for benign or malignant tumours.

METHODS

This was an international, multicentre, prospective, observational, monitored, non-randomized, parallel, four-cohort study (laparoscopic ECA; laparoscopic ICA; robot-assisted ECA; robot-assisted ICA). High-volume surgeons (at least 30 minimally invasive right colectomy procedures/year) from 59 hospitals across 12 European countries treated patients over a 3-year interval The primary composite endpoint was 30-day success, defined by two measures of efficacy-absence of surgical wound infection and of any major complication within the first 30 days after surgery. Secondary outcomes were: overall complications, conversion rate, duration of operation, and number of lymph nodes harvested. Propensity score analysis was used for comparison of ICA with ECA, and robot-assisted surgery with laparoscopy.

RESULTS

Some 1320 patients were included in an intention-to-treat analysis (laparoscopic ECA, 555; laparoscopic ICA, 356; robot-assisted ECA, 88; robot-assisted ICA, 321). No differences in the co-primary endpoint at 30 days after surgery were observed between cohorts (7.2 and 7.6 per cent in ECA and ICA groups respectively; 7.8 and 6.6 per cent in laparoscopic and robot-assisted groups). Lower overall complication rates were observed after ICA, specifically less ileus, and nausea and vomiting after robot-assisted procedures.

CONCLUSION

No difference in the composite outcome of surgical wound infections and severe postoperative complications was found between intracorporeal versus extracorporeal anastomosis or laparoscopy versus robot-assisted surgery.

Safe implementation of robotic right colectomy with intracorporeal anastomosis

The robotic platform can overcome technical difficulties associated with laparoscopic colon surgery. Transitioning from laparoscopic right colectomy with extracorporeal anastomosis (ECA) to robotic right colectomy with intracorporeal anastomosis (ICA) is associated with a learning phase. This study aimed at determining the length of this learning phase and its associated morbidity. We retrospectively analyzed all laparoscopic right colectomies with ECA (n = 38) and robotic right colectomies with ICA (n = 67) for (pre)malignant lesions performed by a single surgeon between January 2014 and December 2020. CUSUM-plot analysis of total procedure time was used for learning curve determination of robotic colectomies. Non-parametric tests were used for statistical analysis. Compared to laparoscopy, the learning phase robotic right colectomies (n = 35) had longer procedure times (p < 0.001) but no differences in anastomotic leakage rate, length of stay or 30-day morbidity. Conversion rate was reduced from 16 to 3 percent in the robotic group. This study provides evidence that robotic right colectomy with ICA can be safely implemented without increasing morbidity.

Predictors of surgical outcomes of minimally invasive right colectomy: the MERCY study

PURPOSE

The optimal approach for minimally invasive (MIS) right colectomy remains under debate. This study aimed to describe surgical trends in the treatment of nonmetastatic right colon cancer and to identify predictors of short-term surgical outcomes.

METHODS

A retrospective multicenter cohort study of Minimally-invasivE surgery for oncologic Right ColectomY (MERCY) was conducted on patients who underwent laparoscopic or robotic right colectomy between 2014 and 2020. Classification tree approach was used to describe the extracorporeal (EA) or intracorporeal (IA) anastomosis choice. Mixed-model regressions were used to identify patient- and surgery-related factors predictive of postoperative outcomes. A questionnaire was used to evaluate the surgeons' perspectives.

RESULTS

The MERCY database comprised 1870 patients; 87.2% underwent laparoscopy, and 68.1% received an EA. A clear surgical trend was noted, with an increasing rate of IA and robotic procedures after 2017. EA represented 41% of anastomoses in centers equipped with a robotic surgical system. Mixed-model regressions (on 1088 patients) showed that age, sex, BMI, comorbidity, robotics, IA, and conversion to open surgery were predictors of surgical outcomes. In particular, IA was a predictor of a shorter time to regular diet and fewer surgical site infections. Based on the questionnaire, IA was the preferred over EA by 72% of surgeons.

CONCLUSION

MIS continues to evolve, with an increasing number of IA being performed in the recent years and when using a robotic surgical system. Understanding the role of predictors of surgical outcomes may help surgeons personalize decision-making among the different MIS options to manage right colon cancer.

Robotic surgery for colorectal cancer

Minimally invasive surgery has demonstrated many benefits in general surgery, particularly in colon and rectal procedures. On the other hand, it has some limitations that must be taken into account, especially technical drawback. Robotic surgery has incorporated many improvements to overcome this disadvantage, such as 3D visualization, articulating instruments assisting complex and precise movements. As a result, robotic colorectal surgery shows less intraoperative blood loss, shorter time to oral tolerance and initial flatus (particularly associated with "Enhanced Recovery After Surgery" protocol), less conversion rate to open surgery, shortened hospital stay, and longer distal margins compared to laparoscopic and open surgery. This approach also shows a shorter learning curve. Some studies suggest that it could decrease perioperatively or 30 days after the intervention's mortality, raise overall survival, reduce wound infection, and improve functional results, while others show no significant difference. However, it lengthens surgical time. Otherwise, the studies included do not show statistically significant changes in the number of resected lymph nodes and anastomotic leaks. Economic costs remain one of the major concerns, although to date there are no large-scale studies that have evaluated this aspect from a global point of view. Robotic surgery represents a qualitative leap in surgical instruments and, although there is no strong evidence in favor of the use of robotic surgery over laparoscopic or open surgery, there is enough evidence to support its use in colorectal surgery, with potential advantages for patients.