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Atrial fibrillation: estimated excess rate of stroke due to lacking adherence to guidelines Zehnder BS; Schaer BA; Jeker U; Cron TA; Osswald SSwiss Med Wkly 2006[Dec]; 136 (47-48): 757-60QUESTIONS UNDER STUDY: Many patients with atrial fibrillation (AF), risk factors for stroke and no obvious contraindications do not receive oral anticoagulation. Estimations of the increased rate of stroke due to neglected anticoagulation, particularly in an elderly, non-selected population, are unknown. METHODS: Consecutive patients with paroxysmal or permanent atrial fibrillation admitted to the medical or surgical department of our hospital for any reason were studied. Risk factors for stroke and contraindications for anticoagulation were recorded. Estimations of the increased rate of cerebrovascular events due to neglected anticoagulation were based on data of a large meta-analysis. Patients were further stratified into different age and risk groups. RESULTS: 484 patients with a mean age of 75 (12) years were studied, 45% were female. 237 patients had no oral anticoagulation at hospital discharge, despite guideline recommendations. Contraindications for anticoagulation were found in 85 (36%) of these patients, resulting in 152 patients with neglected anticoagulation (31% of all patients with AF). We estimated that, if all those patients would have been treated according to guidelines, 7.4 strokes per year could be prevented in the study population. The estimated rate of preventable events was 4.9%/year (7.4/152). CONCLUSIONS: With better adherence to guidelines for oral anticoagulation in patients with atrial fibrillation and risk factors for stroke, a significant number of strokes could be prevented.|*Drug Utilization Review[MESH]|*Practice Guidelines as Topic[MESH]|Administration, Oral[MESH]|Aged[MESH]|Aged, 80 and over[MESH]|Anticoagulants/adverse effects/*therapeutic use[MESH]|Atrial Fibrillation/complications/*drug therapy[MESH]|Contraindications[MESH]|Female[MESH]|Guideline Adherence/*statistics & numerical data[MESH]|Hospitals, University/standards[MESH]|Humans[MESH]|Intracranial Hemorrhages/chemically induced[MESH]|Male[MESH]|Meta-Analysis as Topic[MESH]|Middle Aged[MESH]|Risk Assessment[MESH]|Risk Factors[MESH]|Stroke/*epidemiology/etiology/*prevention & control[MESH]|Switzerland[MESH] |
