Frailty as a Predictor of Postoperative Outcomes in Invasive Cardiac Surgery A Systematic Review of Literature

Objectives Frailty is a syndrome characterized by increased vulnerability and reduced ability to maintain homeostasis after stressful events that results in an increased risk for poor outcomes. Frailty screening could potentially be valuable in cardiac surgery risk assessment. The purpose of this review is to evaluate the current literature linking multicomponent frailty assessment and invasive cardiac surgery outcomes. Methods We searched PubMed, EMBASE, and CINAHL; 1887 articles met the search criteria, and each was independently reviewed by 2 reviewers. Results The 19 eligible studies assessed 52 291 subjects using 17 different frailty measurements. The most commonly used instruments were the Fried Frailty Phenotype and the Clinical Frailty Scale. Between 9% and 61% of participants were found to be frail in each study. All 19 studies included mortality as an outcome, 12 included surgical complications, 12 included hospital length of stay, 3 included quality of life, and 2 included functional status. Nine found statistically significant differences in survival between frail and nonfrail patients, 6 of 12 found that frail patients had a longer length of stay, 4 of 12 found that frail patients were more likely to experience major complications, and 2 of 2 found that frail patients were more likely to have a decrease in functional status. Conclusion Although some studies lacked power, the majority confirmed that frail patients are more likely to experience poor outcomes. Further research is needed to determine which frailty measure provides the best predictive validity and to identify interventions to mitigate the risks that major cardiac surgery poses to frail patients.