Chest pain or palpitations can signal hidden heart trouble. Know when an ECG test is needed, what results show, and when to seek urgent care.

This ECG has typical atrial flutter waves in a "sawtooth" pattern rotating in a clockwise direction. For a complete review of atrial flutter including determining rotation direction, typical versus ...

When atrial flutter is seen with such a slow ventricular response (in this case, 9:1 conduction), there is concern for underlying complete heart block should the patient be restored to normal sinus ...