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Revista Medica Herediana

Print version ISSN 1018-130X


GAMERO, María T; CORNEJO, Marilhia; DUENAS, Roy  and  SAMALVIDES, Frine. Factors associated with optimal oral anticoagulation in elder patients with atrial fibrillation. Rev Med Hered [online]. 2017, vol.28, n.2, pp.84-92. ISSN 1018-130X.

Objective: To determine the quality of oral anticoagulation control and the possible factors associated with time to reach therapeutic range. Methods: Retrospective study with a control group in patients =65 years old with nonvalvular atrial fibrillation who had indication for oral anticoagulation at Hospital Cayetano Heredia from 2011 to 2013. Time to therapeutic range (TTR) was determined by the Rosendal´s method, an optimal control was defined as TTR =60%. A multivariate analysis was performed. Results: Median age was 82.23 years; 74 (51.75%) were females; 140 patients had indication for anticoagulation; 94 (67.14%) started warfarin; 28 (19.72%) had optimal control and 66 did not (46.48%). Age = 75 years (OR 25.5; CI: 7.39-155.8) and no low degree of instruction (OR 25.5; CI: 7.39-155.8) were associated with sub optimal control, while functional independence (OR 4.3; CI: 2.16-9.47), no cognitive deterioration (OR 7.8; CI: 3.53-20.19) and female gender (OR 3; CI: 1.62-5.81) were associated with optimal control. Conclusions: A great percentage of patients with indications for oral anticoagulation and at low risk of bleeding did not start it, and 50% of those who started it had suboptimal control. Older patients with comorbidities who used multiple medications had sub optimal control, while females and functional independence were associated with optimal control.

Keywords : Atrial fibrillation; warfarin; aged; stroke.

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