A cautionary note on data sources for evidence-based clinical decisions: warfarin and stroke prevention.


BACKGROUND Stroke risk in nonvalvular atrial fibrillation can be reduced by warfarin or aspirin; the choice of therapy requires the assessment of risks and benefits. The authors compared methods of risk assessment and their implications for risk communication and treatment. METHODS Stroke risk was compared in 193 patients with atrial fibrillation using… (More)