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A multicenter study of anticoagulation parameters when using heparin and warfarin.
M J Alberts1, E W Massey, D Dawson
1Division of Neurology, Duke University Medical Center, Durham, NC 27710.
Archives of Neurology
|December 1, 1987
Summary
Physicians may be over-anticoagulating patients with warfarin, potentially increasing bleeding risks. This study surveyed neurologists on their anticoagulation practices, revealing common use of higher-than-recommended warfarin dosages.
Area of Science:
- Neurology
- Pharmacology
- Clinical Medicine
Background:
- Anticoagulation with heparin and warfarin is crucial for diseases like cerebrovascular disease.
- Optimal anticoagulation ranges remain unclear, with higher intensity linked to increased bleeding risk.
- Recent evidence suggests lower anticoagulation levels may be equally effective with fewer complications.
Purpose of the Study:
- To assess current anticoagulation parameter practices among neurologists and house officers.
- To identify potential discrepancies between clinical practice and recommended guidelines for warfarin therapy.
Main Methods:
- A questionnaire survey was conducted across six major medical centers.
- Responses were collected from 30 attending neurologists and 52 house officers.
- Data on partial thromboplastin time (PTT) and prothrombin time (PT) ratios were analyzed.
Main Results:
- Attending neurologists and house officers reported mean PTTs of 57.7s and 63.3s, respectively.
- Mean PTs were 21.0s (attendings) and 19.4s (house officers).
- Average PT ratios were 1.82 (attendings) and 1.69 (house officers), with 40% of attendings and 17.7% of house officers using ratios ≥2.0.
Conclusions:
- A significant proportion of physicians may be utilizing warfarin dosages exceeding recommended guidelines.
- These findings suggest a potential for increased bleeding complications due to over-anticoagulation.
- Further education and adherence to evidence-based guidelines are warranted for safe anticoagulation management.