Because the heart’s electrical system is complicated, diagnosing abnormal heart rhythm (arrhythmias) can be difficult and requires heart rhythm experts who use special testing equipment. To find the problem, a doctor will take a medical history, ask about symptoms, give a thorough physical exam, and order specific tests.
Patients carry an event-recording box so they can make a one- to two-minute recording of their heart rhythm when they have symptoms. Smaller than the size of a paperclip, the recorder is inserted subcutaneously and is helpful for patients with who have short-lived or infrequent symptoms.
Credit: Heart Rhythm Society