Randomization: Patients will be randomized in a 1:1 ratio to either receive a 15-day event monitor Cardiophone or a 48-hour holter monitoring with the MCT device. Patients will be stratified based on the total CSARS score: 3-4; 5-6; and 7-8 and allocated using randomly permuted blocks of varying lengths. Allocations will be computer-generated by an independent statistician and concealed by having research staff log on to a password-protected Electronic Data Capture (EDC) System located within the coordinating center website.