If you don't experience atrial fibrillation (a-fib) every day, you may be given a type of event monitor that can be used to record the abnormal rhythm whenever you feel it happening. Then, you transmit a recording of the rhythm over the phone to a monitoring system. If a telephone is nearby, this can be done during the period of the irregular rhythm. If not, you can store the recording in the memory of the event recorder and transmit it later. This is called transtelephonic monitoring.