Methods: Cardiophone (live monitor) will be used for the intervention arm and the Mobile Cardiac Telemetry (MCT) device will be used for the control arm and both devices applied prior to ED discharge. MCT will function as a holter for first 48-hours and then as an event recorder (days 3-15) for arrhythmia surveillance. After written informed consent, patients will be randomized 1:1 with allocation concealed by web-based randomization and stratified based on the total CSARS scores. All patients will be linked to a study cardiologist and will have follow-up after 15-days. If serious arrhythmias are detected by Cardiophone, the patient will be transported to ED and for non-serious arrhythmias, an interim report sent to the study cardiologist for follow-up. All monitoring reports will be sent to the cardiologist within 24-hours of completion. Data collection: patient demographics, medical history, score predictors, device data (failure, false alarms, duration worn), patient symptoms and comfort. Primary outcome will be diagnostic yield at 15-days in the two study arms and primary analysis will compare the diagnostic yield by intention to treat principle controlling for the stratification factor. Sample Size: 300 patients per arm (600 total) to detect a 10% difference in diagnostic yield between the arms.