Wolf Parkinson White or WPW syndrome causes changes in the heartbeat.
In this condition, a fast heart rate is caused by a redundant circuit connecting the parts of the heart. This acts like a short cut, stimulating the heart to beat too early.
The symptoms of WPW can include light headedness, fainting, exercise intolerance, anxiety or chest pain. Sometimes a person with WPW has no symptoms at all.
WPW is normally present at birth. It can be diagnosed by a heart rhythm test called an EKG. The EKG finding is a short PR interval or delta wave, which looks like an upsloping curve in the QRS complex.
When WPW needs to be cured, a procedure called catheter ablation can help. In this procedure, the electrical short cut is disrupted by a tiny burn or scar.