Key result
Advanced age is linked to a ~29% lower daily warfarin dose requirement.
Why the study?
Does the required warfarin maintenance dosage decrease with increasing age in elderly patients?
Population
253 patients >50 years of age monitored by an anticoagulation clinic with a targeted INR of 2-3 and two…
Design
Cross-sectional
Authors
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May warrant lower warfarin doses in patients ≥85 years; leaves open need for prospective validation before practice change.
Observational (n=253)
Does the required warfarin maintenance dosage decrease with increasing age in elderly patients?
Absolute Event Rate: 3.5% vs 4.9%
Elderly patients, particularly those over 85 years, require significantly lower maintenance doses of warfarin to maintain a stable INR compared to younger patients.
Singla et al. (2005) conducted an observational in Patients requiring warfarin with a stable INR (mostly atrial fibrillation or flutter) (n=253). Advanced age (≥85 years) vs. Younger age (<75 years) was evaluated on Mean daily warfarin dose. Advanced age was associated with a significantly lower mean daily warfarin dose, requiring 3.5 mg/day in patients ≥85 years compared to 4.9 mg/day in those <75 years.
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