The Association of Modified 5-Item Frailty Index on Perioperative Cochlear Implant Speech Perception.

Objective: This study aims to evaluate the potential association of perioperative hearing outcomes with frailty by Modified 5-Item Frailty Index (mFI-5).

Design: Retrospective cross-sectional study.

Setting: Single-institutional study conducted at a tertiary care hospital between January 2018 and January 2022.

Patients: All adult patients older than 50 years who underwent cochlear implantation (CI).

Interventions: Cochlear implantation.

Main outcomes measures: Hearing outcomes were measured using pre-CI and longitudinal post-CI quiet AzBio scores. Frailty was determined by mFI-5 scores (0 = not frail, 1 = prefrail, and 2+ = frail). Univariable and multivariable linear regressions, ordinal logistic regressions, and time-to-event curves were used to determine perioperative speech perception and likelihood of high-performance hearing (defined as ≥70% on AzBio).

Results: Of the 126 patients, the median age was 70 (63-77) years, 50% (63) were female, and 39% (49) identified as non-Hispanic Black, Hispanic, or other. By mFI-5 scoring, 38% (48) had no frailty, with 34% (43) and 28% (35) scoring 1 and 2+, respectively. When adjusting for age, sex, race, and BMI, scoring 1 point on mFI-5 was associated with significantly lower pre-implantation and post-implantation AzBio scores (pre: = -15 [-26, -3.4], p < 0.05; post: = -14 [-25, -3.0], p < 0.05). When controlling for all covariates, prefrailty and frailty were associated with significantly decreased likelihood of high-performance hearing (prefrailty OR: 0.22 [0.07, 0.63], p < 0.01; frailty OR: 0.31 [0.10, 0.92], p < 0.05). Time-to-event curves demonstrate significantly reduced likelihood of reaching high-performance hearing within 7 months after CI in patients with mFI-5 scores >0 (p < 0.05).

Conclusion and relevance: Our findings suggest that prefrailty is associated with worse pre-CI and post-CI hearing and lower likelihood of high-performance hearing within 7 months post-CI. Preoperative frailty screening in adult CI candidates may better inform providers of patients' long-term risk-to-benefit.