Context: Currently, only holter monitoring (records all cardiac beats) for 1-2 days is used and prolonged monitoring devices are not used for arrhythmia detection. The majority of syncope patients are not monitored when symptomatic. Arrhythmias are detected only if evident when patients seek care. The investigators recently completed a multicenter prospective syncope study and developed the Canadian Syncope Arrhythmia Risk Score (CSARS). Our results show that most serious conditions are identified within the first few hours in ED among the low and moderate-risk patients while for higher-risk patients the risk of arrhythmia remains high up to 15 days indicating the need for prolonged monitoring.