Wolff–Parkinson–White syndrome

Wolff-Parkinson-White syndrome is a heart condition in which there is an extra electrical pathway (circuit) in the heart. The condition can lead to episodes of rapid heart rate
Wolff-Parkinson-White is one of the most common causes of fast heart rate disorders in infants and children.
In people with Wolff-Parkinson-White syndrome, there is an extra, or accessory, pathway that may cause a very rapid heart rate. This is called supraventricular tachycardia.
ECG  may show an abnormality called a "delta" wave. ( see the short PR interval)

Intracardiac electrophysiology study (EPS) : May be needed sometimes to make the diagnosis. The study involves placing wire electrodes in the heart to check for abnormal heartbeats or heart rhythms.

Medication may be used to control or prevent rapid heart beating. These include adenosine, antiarrhythmics, and amiodarone.

 electricalcardioversion may be needed in some

The current preferred therapy for Wolff-Parkinson-White syndrome is catheter ablation (success rate for the procedure ranges between 85 - 95%). The small area that is causing the fast heart rate is destroyed using radiofrequency.

Rarely surgery is needed

 Success rate of Catheter ablation will vary depending on location of accessory pathway and number of accessory pathways.

Courtesy: http://en.wikipedia.org/wiki/Wolff%E2%80%93Parkinson%E2%80%93White_syndrome, http://www.nlm.nih.gov/medlineplus/ency/article/000151.htm AND http://pedicardiology-bala.blogspot.com/2011/08/ekg-wpw-syndrome.html