What causes Wolff-Parkinson-White syndrome ?
What causes Wolff-Parkinson-White syndrome? Normally, electrical signals in the heart go through a pathway that helps the heart beat regularly. The wiring of the heart prevents extra beats from occurring and keeps the next beat from happening too soon. In people with Wolff Parkinson White syndrome, there is an extra, or accessory, pathway that may cause a very rapid heart rate. This extra electrical pathway is present at birth. A mutation in the PRKAG2 gene  is the cause of a small percentage of cases of the disorder. Otherwise, little is known about why this extra pathway develops.