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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.]