Shawon MSR, Odutola M, Falster MO, et al. - Researchers aimed at determining the rates of readmission within 30 days of coronary artery bypass graft (CABG) surgery. In addition, they investigated the causes of readmissions as well as examined patient- and hospital-level factors that influence readmission. Systematic searches (until June 2020) of PubMed and Embase databases yielded 53 studies meeting inclusion criteria, including 8,937,457 CABG patients. Findings revealed the necessity for readmission within 30 days for nearly 1 in 8 CABG patients and the majority of these are readmitted for infection and sepsis, cardiac arrhythmia, congestive heart failure, respiratory complications and pleural effusion. Thirty-day readmission rates were noted to be strongly linked with individual factors including age (OR per 10-year increase 1.12 [95% CI: 1.04–1.20]), female gender (OR 1.29 [1.25–1.34]), non-White race (OR 1.15 [1.10–1.21]), not having private insurance (OR 1.39 [1.27–1.51]) and various comorbidities. Overall, patients’ demographic and clinical characteristics strongly influenced readmission rates, but there was no influence of broadly defined hospital characteristics.