Stroke prevention in atrial fibrillation: are we following the guidelines?

Warfarin therapy substantially reduces stroke in atrial fibrillation (AF), yet medical literature reports it is only prescribed in 15-60% of eligible patients. No current national benchmarks for warfarin use in AF patients exist, and it is unclear whether the reported poor compliance represents current rates within primary care practices. The primary study objective was to measure the rate of warfarin use in eligible, high-risk AF patients in a large southeastern group family practice. Secondary objectives were to report the demographics, stroke-risk profiles, contraindications, and reasons for discontinuation of warfarin therapy

A retrospective chart review was performed on all active patients with documented AF in a large southeastern group family practice/residency between July 1, 2000 and June 30, 2002. Data was abstracted on warfarin use, contraindications, stroke risk, and reasons for discontinuation.

Four hundred ninety-one (491) patients were identified from the electronic billing system as potential study subjects. Two hundred eighty-three (283) patients met study criteria, with 210 patients considered to be at high-risk of stroke without contraindications to warfarin therapy. Ninety-four percent (198/210) of these patients were prescribed warfarin during the study period, and 87% (172/198) continued warfarin throughout the study period.

Family physicians in this practice prescribe warfarin in AF more frequently than published rates demonstrating that high rates of physician adherence to standards are achievable in primary care. Most patients in this setting were considered high-risk for stroke.