Real-life effectiveness of prehabilitation to improve postoperative outcomes in patients with colorectal cancer approaching surgery: A systematic review and meta-analyses of observational studies versus randomized controlled trials

Abstract

Introduction

Current evidence synthesis of prehabilitation studies in colorectal surgery is based on results of randomized controlled trials (RCT). Although RCTs are the gold standard for effectiveness research, observational studies probably better reflect real-life practice. The aims of the current study were to compare observational studies to RCTs regarding the association between prehabilitation and postoperative outcomes, and characteristics of included patients and interventions.

Methods

A systematic search was conducted in PubMed, Embase, and CINAHL (until September 2023). Observational studies and RCTs investigating prehabilitation before colorectal surgery and reporting postoperative complications and/or length of stay (LoS) were included. Two reviewers independently assessed the risk of bias using the Cochrane Risk of Bias 2 tool for RCTs and the Cochrane ROBINS-I tool for observational studies. Meta(regression)-analyses were performed for postoperative complications and LoS.

Results

Pooled results showed a statistically significant reduction in postoperative complications (OR 0.54; 95 % confidence interval (CI) 0.40 to 0.72) and LoS (mean difference (MD) −1.34 CI -2.57 to −0.12) after prehabilitation in observational studies but not in RCTs (complications OR 0.95; CI 0.53 to 1.72; LoS MD 0.16 CI -0.52 to 0.83). Patients included in observational studies were older and more often had an ASA score ≥3. In a meta-regression analysis, these characteristics were not statistically significantly associated with the main outcomes.

Conclusion

Observational studies in a real-life setting showed that prehabilitation can reduce postoperative complications and LoS. To further explore the real-life effectiveness of prehabilitation, specific observational study designs, like a target emulation trial could be used.