Frailty Explains Variation in Emergency Department Use for Older Veterans During the COVID-19 Pandemic.

Introduction: Older adults were critically vulnerable to disruptions in health care during the COVID-19 pandemic, but it is not known if changes in ED utilization varied based on patient characteristics. Using a cohort of older Veterans, we examined changes in ED visit rates based on four characteristics of interest: age, race, area deprivation index, and frailty.

Methods: Participants were aged ≥65, with ≥2 visits in primary or geriatric clinics between 02/02/2018-05/07/2019. An adjusted negative binomial regression model was constructed for each characteristic. We report mean counts of all ED visits by quarter for subgroups separately, and report rate ratios to compare ED visits in the first year of the COVID-19 pandemic to the year before.

Results: Patients with complete case data numbered 38,871. During the first two quarters, all subgroups had decreased ED visits, with more variation in the third and fourth quarters. The very highly frail, who had the highest mean estimated count of ED visits per person through both pre-COVID and COVID periods, also had a significant decrease in their ED visits during multiple quarters of the pandemic to a greater degree than other frailty subgroups.

Conclusion: Stratifying older adults by frailty identified patient subgroups with the greatest variation in ED visits during COVID. Very highly frail patients warrant special attention to understand how variation in ED utilization affects patient outcomes.