There are many circumstances wherein a rhythm disturbance, or symptoms presumed to be due to a rhythm disturbance, occur infrequently and cannot be documented during a single 24-hour record, such as that obtained with a holter monitor. These infrequent events require that electrocardiographic documentation be recorded at the time of the symptoms. An electrocardiographic event monitor is loaned to such patients for periods up to a month with instructions regarding its activation at the time of symptoms. The electrocardiogram which is recorded is transmitted over the telephone to a central station, from which it is transferred to your physician for interpretation.