Geospatial Factors Interact with Baseline Health to Impact Covid-19 Mortality (Community Hospital)

ABSTRACT

INTRODUCTION: Social determinants of health have been under-reported in critically ill patients during the pandemic. We hypothesized that geospatial factors and baseline health status in our community would significantly impact outcomes from Covid-19 infection. METHOD(S) We conducted an urban, single-center, observational study of patients with Covid-19 infection admitted to our adult ICU over ten months (March 23, 2020 to January 21, 2021, after approval by our hospital's Institutional Review Board. Weekly prospective data on the Covid-19 study population were entered in our ICU's quality assurance database. Data specific to test our hypothesis-zip code of residence, functional status, and Canadian Frailty Score (1-7)-were collected from retrospective chart review. The studied population was dichotomized to access patients who resided in long-term care facilities or home residence. Five zip code regions based on sample size and the distance from the patient's residence to the hospital allowed random sampling. Statistical significance was determined using ANOVA and T-test as indicated. RESULT(S) A total of 300 patients were enrolled. Across the designated cohort-based zip code regions, the mean frailty score of patients who resided at home differed significantly (2.9+/- SE.98 vs. 3.8+/- SE. 1.28, p< 0.01). Favorable frailty scores of 1-2 had a combined death and hospice rate of 23%. Of the survivors, 30% were transferred to skilled nursing facilities (SNF) and 26% were discharged to home. Patients with frailty scores of 6-7 had a final mortality rate of 83%. Of the survivors, only 2% were transferred to a SNF and 6% were discharged to home. Compared to admitting frailty scores between 1-3, a frailty score of 4 or greater (which represented 35% of all Covid ICU patients admitted from home) had a 1.8 relative risk of death (p< 0.0001). CONCLUSION(S) In our adult Covid-19 population, geospatial factors were associated with significant variances in frailty determined on ICU admission. Worsening frailty scores were associated with marked differences in both survival and final disposition, with combined death and hospice rates as high as 80%. We recommend that these metrics be added to routine data reporting to help better characterize ICU populations and stimulate efforts to improve frailty in vulnerable populations.