Some rhythm abnormalities occur infrequently when certain activities are pursued only. Using CardioBlue Bluetooth-capable looping ECG event recorderincreases the chance of capturing rarely occuring arrhythmias. CardioBlue can be used both as a looping ECG event recorder and as a post-event ECG recorder. As a looping ECG event recorder, it records ECG both preceeding and following the event, while as a post-event recorder it records ECG after the event only. In looping mode CardioBlue can record ECG up to 1 week. In post event mode a 3-month monitoring period is available.