PMID: 8951296Dec 9, 1996Paper

National patterns of warfarin use in atrial fibrillation

Archives of Internal Medicine
R S Stafford, D E Singer

Abstract

Despite consensus that patients with atrial fibrillation benefit from warfarin sodium anticoagulation, little is known about national trends and predictors of anticoagulant use. We analyzed 1062 visits by patients with atrial fibrillation to randomly selected office-based physicians included in the National Ambulatory Medical Care Surveys in 1980, 1981, 1985, and 1989 through 1993. Warfarin and aspirin use in these patients was extrapolated to national patterns and logistic regression was used to determine independent predictors. Patients with atrial fibrillation made an estimated 1.3 (1980) to 3.1 (1992) million annual visits to physicians. Warfarin use in atrial fibrillation increased from 7% in 1980 and 1981 to 32% in 1992 and 1993 (P < .001 for trend). In 1992 and 1993, patients 80 years or older were significantly less likely to be taking warfarin (19%) compared with younger patients (36%), but showed similar rates of increase from 1980 and 1981 to 1992 and 1993. In 1992 and 1993, anticoagulation therapy was significantly more likely to be reported in visits to cardiologists (32%) and general internists (40%) compared with general and family practitioners (15%), but was similar in women (34%) and men (30%). Residents of th...Continue Reading

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