probabilities of a cva and of bleeding with and without warfarin were determined if all patients were anticoagulated , if patients with positive echocardiographic results were treated , if patients with negative echocardiographic results were treated and if echocardiographically guided therapy was instituted in which patients with positive echocardiographic results are treated and patients with negative results are not treated .
C0038454
cva
C0043031
warfarin