Clinical frailty and functional trajectories in hospitalized older adults: A retrospective observational study

Aim: Frailty predicts inpatient mortality and length of stay, but its link to functional trajectories is under-researched. Addenbrooke's Hospital, Cambridge, UK, collects the Clinical Frailty Scale (CFS) within 72 h of admission for those aged ≥75 years. We studied whether the CFS links to functional trajectories in hospitalized older adults.

Methods: This was a retrospective observational study in an English university hospital. We analyzed all first episodes of county residents aged ≥75 years admitted to the Department of Medicine for the Elderly wards between December 2014 and May 2015. Data were extracted from the hospital's information systems. Patients were classified as non-frail (CFS 1-4), moderately frail (CFS 5-6) and severely frail (CFS 7-8). Function was retrospectively measured with the modified Rankin Scale (mRS) at preadmission, admission and discharge.

Results: Of 539 eligible patients, 46 died during admission (mortality rates: 2% in CFS 1-4, 5% in CFS 5-6, 19% in CFS 7-8). Among the 493 survivors, 121 were non-frail, 235 moderately and 137 severely frail. The mean mRS of the non-frail was 1.8 (95% CI 1.7-2.0) at baseline, 3.3 (95% CI 3.1-3.5) on admission and 2.2 (95% CI 2.0-2.3) on discharge (mean length of stay 9 days). The moderately frail had a mean mRS of 2.9 (95% CI 2.8-3.0) at baseline, 4.0 (95% CI 3.8-4.1) on admission and 3.2 (95% CI 3.1-3.3) on discharge (mean length of stay 15 days). The severely frail had mean mRS of 3.5 (95% CI 3.3-3.6) at baseline, 4.3 (95% CI 4.1-4.4) on admission and 3.7 (95% CI 3.6-3.9) on discharge, respectively (mean length of stay 17 days).

Conclusions: In older inpatients, frailty might be linked to lower and slower functional recovery. Prospective work is required to confirm these trajectories and understand how to influence them. Geriatr Gerontol Int 2017; 17: 1063-1068.