Abstract 12096: Temporal Trends in Ischemic Stroke and Anticoagulation Therapy Among Medicare Beneficiaries Having Non-Valvular Atrial Fibrillation With and Without Diabetes Mellitus, 1992-2010
Background: Patients with diabetes mellitus (DM) and non valvular atrial fibrillation (AF) are at increased risk of ischemic stroke; but evidence regarding ischemic stroke and warfarin use in the literature is limited. We evaluated temporal trends in ischemic stroke and warfarin use among the US Medicare population with and without DM.
Methods: One-year cohorts of patients with Medicare as primary payer, 1992-2010, were created using the Medicare 5% sample. ICD-9-CM codes were used to identify AF, ischemic and hemorrhagic stroke and comorbidities; ≤3 consecutive prothrombin-time claims were used to identify warfarin use.
Results: Demographic characteristics between 1992 (n=40255) and 2010 (n=80314) respectively were (proportions): age 65-74 years (37%, 32%); age ≤ 85 years (20%, 25%); white (94%, 93%); hypertension (46%, 80%); DM (20%, 32%), chronic kidney disease (5%, 18%). Ischemic stroke rates among Medicare AF patients with DM decreased by 71% (1992, 2010) from 65 to 19 /1000 patient-years; warfarin utilization increased from 28% to 62% respectively (Figure 1A). Among Medicare AF patients without DM, ischemic stroke rates decreased by 68% from 44 to 14/ 1000 patient-years; warfarin use increased 26% to 59% respectively (Figure 1B). About 38% Medicare AF pts with DM did not receive anticoagulation in 2010.
Conclusion: Medicare patients with and without DM had a similar reduction in ischemic stroke rates; and similar increase in warfarin utilization over the study period. A significant proportion of Medicare pts with DM did not receive anticoagulation with warfarin for AF in 2010; this population deserves future attention.
Author Disclosures: G.R. Shroff: None. C.A. Solid: None. C.A. Herzog: Other Research Support; Modest; Amgen, Gilead, Zoll (pending). Honoraria; Modest; Amgen, ClearView Healthcare Partners, Keryx, UpToDate. Ownership Interest; Modest; Boston Scientific, Cambridge Heart, GE, Johnson & Johnson, Merck. Consultant/Advisory Board; Modest; AbbVie, Fibrogen, Fish & Richardson, PC, GSK, Keryx, ZS Pharma.
- © 2014 by American Heart Association, Inc.