17-18% of cases of syncope are attributable to dysrhythmias. The best predictors of dysrhythmias in these patients are: 1. abnormal ECG (odds ratio 8.1) 2. history of CHF (odds ratio 5.3) 3. age > 65 (odds ratio 5.4)
[reference: Sarasin FP, et al. A risk score to predict arrhythmias in patients with unexplained syncope. Acad Emerg Med 2003.]
