Congenital: Congenital is a term, which denotes acquired by birth.
ECG: A procedure that uses ultrasonic waves directed over the chest wall to obtain a graphic record of the heart's position, motion of the walls, or internal parts such as the valves.
Ablation: Elimination or removal.
Calcium Channel blocker: A type of medication which relieves high blood pressure (hypertension) and angina by interrupting the influx of calcium into the muscle of the heart and arteries, which is needed for contraction.
Wolff-Parkinson-White Syndrome: Condition in which there is an extra electrical pathway between the atria and ventricles; a cause of episodic rapid heartbeat.