Association Between Prehip Fracture Antidepressant Use and Posthip Fracture Length of Hospital Stay in Medicare Beneficiaries and Assessing Sex Differences.

OBJECTIVE

Antidepressants are the first-line treatment for depression among older adults. While antidepressants are associated with increased risk of falls and fractures in older adults, their effect on outcomes after fall-related injuries such as hip fracture, and whether these effects differ by sex, is unknown. Thus, the purpose of this study was to examine the association between prefracture antidepressant use and hospital length of stay (LOS) among hip fracture survivors, and related sex differences.

METHODS

Participants included 17,936 community-dwelling Medicare fee-for-service beneficiaries with depression and hospitalization claim for hip fracture surgery between 2010 and 2017. Ordinal logistic regression estimated the association between prefracture antidepressant use and hospital LOS in days, categorized into three groups (1-4, 5-8, and 8+ days) during the 30-day postfracture period, adjusting for demographic, medical, facility, and geographic factors. A sex-by-antidepressant use interaction term was included to examine effect heterogeneity by sex.

RESULTS

Prefracture antidepressant users (47%, n = 8,350) were more likely to be younger, White females. The adjusted ordinal logistic regression showed beneficiaries who used antidepressants had 8% higher odds of being in a shorter hospital LOS category compared to non-users (OR = 1.08; 95% CI = 1.02, 1.14; p=0.01). The sex-by-antidepressant use interaction was not statistically significant (p=0.92).

CONCLUSIONS

Among older adults with depression who subsequently experienced a hip fracture, antidepressant use of >30 days in the 6 months prior to fracture was associated with a shorter hospital LOS. These findings indicate that use of antidepressants does not prolong early recovery from hip fracture and may be protective.