Use of alendronate and risk of incident atrial fibrillation in women

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Arch Intern Med. 2008 Apr 28;168(8):826-31 Heckbert SR, Li G, Cummings SR, Smith NL, Psaty BM. BACKGROUND: A recent publication from the HORIZON (Health Outcomes and Reduced Incidence With Zoledronic Acid Once Yearly) trial in women with postmenopausal osteoporosis reported a higher risk of serious atrial fibrillation (AF) in zoledronic acid recipients than in placebo recipients. This adverse effect was unexpected and had not been recognized previously. METHODS: We studied alendronate sodium ever use in relation to the risk of incident AF in women in a clinical practice setting. This population-based case-control study was conducted at Group Health, an integrated health care delivery system in Washington State. We identified 719 women with confirmed incident AF between October 1, 2001, and December 31, 2004, and 966 female control subjects without AF, selected at random from the Group Health enrollment and frequency matched on age, presence or absence of treated hypertension, and calendar year. RESULTS: More AF case patients than controls had ever used alendronate (6.5% [n = 47] vs 4.1% [n = 40]; P = .03). Compared with never use of any bisphosphonate, ever use of alendronate was associated with a higher risk of incident AF (odds ratio, 1.86; 95% confidence interval, 1.09-3.15) after adjustment for the matching variables, a diagnosis of osteoporosis, and a history of cardiovascular disease. Based on the population-attributable fraction, we estimated that 3% of incident AF in this population might be explained by alendronate use. CONCLUSION: Ever use of alendronate was associated with an increased risk of incident AF in clinical practice

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