Defense Date

2013

Document Type

Dissertation

Degree Name

Doctor of Philosophy

Department

Pharmaceutical Sciences

First Advisor

Spencer Harpe

Second Advisor

Patricia Slattum

Abstract

Osteoporosis and depression are prevalent among older postmenopausal women 65 years or older. Bisphosphonates (BPs) and selective serotonin reuptake inhibitors (SSRIs) or serotonin norepinephrine reuptake inhibitors (SNRIs) are commonly used medications to treat these conditions. Inhibitory effects of BPs on osteoclasts are responsible for the reduction in fracture risk. SSRIs, however, are associated with increased fracture risk through decreasing osteoblasts and increasing osteoclastic activity. These effects of SSRIs could attenuate the beneficial effects of BPs. This dissertation describes the concomitant use of BPs and SSRIs among postmeopausa women and reports findings from examining the association between concomitant use of BPs and SSRIs and fracture risk. Separate cross-sectional analyses were performed using data from the 2004-2008 Medical Expenditure Panel Survey (MEPS) and Medicare Part D prescriptions claims data (2008-2010) to examine usage patterns of BPs and SSRIs/SNRIs for women aged ≥45 years and ≥65 years, respectively. For our second objective, a nested-case control was conducted using Medicare claims data (2008-2010). Data from Medicare inpatient claims were linked to Medicare Part D data for all female BP users 65 years or older. We used Cox proportional hazards model to assess the increased risk of osteoporotic-related fractures among propensity score matched (1:1 ratio) cohorts of concomitant users of BPs and SSRIs and BP alone users. Concomitant use of BPs and SSRIs was prevalent and increased with age for each timeframe examined. Findings showed that approximately 12% (using MEPS) and 28% (using Medicare data) of women on BPs were also on SSRIs. For the second objective, 4,214 propensity score matched pairs (average age=80.4 years) of subjects were analyzed. Findings showed that concomitant use of BPs and SSRIs was associated with statistically significant increased risk for any fracture (HR=1.29, 95% CI, 1.07-1.57), but statistically non-significant increased risk for hip (HR=1.16, 95% CI, 0.92-1.47) and vertebral fractures (HR=1.55, 95% CI, 0.97-2.48). Current findings indicate that concomitant use of BPs and SSRIs is not uncommon among postmenopausal women and suggest potential attenuation of antifracture efficacy of BPs by SSRIs. Further studies are needed to understand the clinical impact of concomitant use of these medications among older postmenopausal women.

Rights

© The Author

Is Part Of

VCU University Archives

Is Part Of

VCU Theses and Dissertations

Date of Submission

12-11-2013

Available for download on Tuesday, December 11, 2018

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