Use of bisphosphonates in chronic kidney disease is associated with cardiovascular death.

BACKGROUND AND

OBJECTIVES

Chronic kidney disease (CKD) is associated with increased cardiovascular risk, which may be mediated by vascular calcification. Based on evidence that bisphosphonates inhibit vascular calcification, we hypothesized use of bisphosphonates in CKD would be associated with lower incident cardiovascular disease (CVD), CVD-related mortality, and all-cause mortality.

MATERIALS AND

METHODS

This was a longitudinal observational study including 2,593 Framingham Offspring participants. We used propensity score-adjusted Cox regression models to determine the association between bisphosphonate use and outcomes: time to incident CVD, time to CVD-related mortality, and time to all-cause mortality. The data were stratified by presence or absence of CKD, defined as estimated glomerular filtration rate < 60 mL/min/1.73m2. The propensity score included age, sex, hypertension, smoking status, diabetes, total cholesterol, high-density lipoprotein, and self-reported history of fracture.

RESULTS

In unadjusted and propensity score-adjusted analyses, those with CKD using bisphosphonates had a trend toward increased incident CVD risk (adjusted hazard ratio (HR) 1.66 (95% CI, 93 - 2.97)) compared to those with CKD not using bisphosphonates. Those with CKD using bisphosphonates also had increased risk of cardiovascular mortality in the propensity score-adjusted model (adjusted HR 2.20 (95% CI, 1.12 - 4.32)). There was no significant association between bisphosphonate use and all-cause mortality in participants with CKD. Among individuals without CKD, bisphosphonate use was significantly associated with an increase in all-cause mortality in the propensity-score adjusted analysis (adjusted HR 1.59 (95% CI, 1.27 - 1.98)). However, there was no significant association between bisphosphonate use and incident CVD events (adjusted HR 0.85 95% CI, 0.63 - 1.16) or CVD-related death (adjusted HR 0.70 (95% CI 0.36 - 1.37) in those without CKD.

CONCLUSION

Contrary to our hypothesis, bisphosphonate use was associated with a trend toward increased incident CVD and a two-fold higher risk of CVD mortality in CKD.