The Clinical Frailty Scale is the most feasible frailty measure and has the strongest association with mortality and non-favourable discharge.

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• Sylvie D Aucoin, Mike Hao, Raman Sohi, Julia Shaw, Itay Bentov, David Walker, and Daniel I McIsaac.
• From the Centre for Perioperative Medicine, University College London, London, United Kingdom (S.D.A., D.W.) the Department of Anesthesiology and Pain Medicine, (S.D.A., M.H., R.S., D.I.M.) the School of Epidemiology and Public Health (J.S., D.I.M.), University of Ottawa, Ottawa, Canada the Department of Anesthesiology and Pain Medicine, The Ottawa Hospital, Ottawa, Canada (S.D.A., D.I.M.) the Department of Anesthesiology and Pain Medicine, Harborview Medical Center, University of Washington, Seattle, Washington (I.B.) the Clinical Epidemiology Program, The Ottawa Hospital Research Institute, Ottawa, Canada (D.I.M.).
• Anesthesiology. 2020 Jul 1; 133 (1): 78-95.

BackgroundA barrier to routine preoperative frailty assessment is the large number of frailty instruments described. Previous systematic reviews estimate the association of frailty with outcomes, but none have evaluated outcomes at the individual instrument level or specific to clinical assessment of frailty, which must combine accuracy with feasibility to support clinical practice.MethodsThe authors conducted a preregistered systematic review (CRD42019107551) of studies prospectively applying a frailty instrument in a clinical setting before surgery. Medline, Excerpta Medica Database, Cochrane Library and the Comprehensive Index to Nursing and Allied Health Literature, and Cochrane databases were searched using a peer-reviewed strategy. All stages of the review were completed in duplicate. The primary outcome was mortality and secondary outcomes reflected routinely collected and patient-centered measures; feasibility measures were also collected. Effect estimates were pooled using random-effects models or narratively synthesized. Risk of bias was assessed.ResultsSeventy studies were included; 45 contributed to meta-analyses. Frailty was defined using 35 different instruments; five were meta-analyzed, with the Fried Phenotype having the largest number of studies. Most strongly associated with: mortality and nonfavorable discharge was the Clinical Frailty Scale (odds ratio, 4.89; 95% CI, 1.83 to 13.05 and odds ratio, 6.31; 95% CI, 4.00 to 9.94, respectively); complications was associated with the Edmonton Frail Scale (odds ratio, 2.93; 95% CI, 1.52 to 5.65); and delirium was associated with the Frailty Phenotype (odds ratio, 3.79; 95% CI, 1.75 to 8.22). The Clinical Frailty Scale had the highest reported measures of feasibility.ConclusionsClinicians should consider accuracy and feasibility when choosing a frailty instrument. Strong evidence in both domains support the Clinical Frailty Scale, while the Fried Phenotype may require a trade-off of accuracy with lower feasibility.

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