Diagnosing the cause of syncope is often a challenging problem which may require input from a number of different specialists. Unfortunately, the cause of isolated episodes of syncope may often go unidentified, despite extensive evaluation. The basic electrocardiogram (EKG), along with echocardiogram, and exercise treadmill test in conjunction with a detailed history is often adequate in ruling out primary cardiac causes of syncope. Depending on the details of the history provided by the patient, wearing an event recorder, implantation of a loop recorder, or tilt-table testing may also be called for.