WPW is one of the most common causes of sudden death in young athletes.
"In Wolff-Parkinson-White (WPW) syndrome, an extra electrical pathway between your heart's upper and lower chambers causes a rapid heartbeat. The condition, which is present at birth, is fairly rare.
The episodes of fast heartbeats usually aren't life-threatening, but serious heart problems and death can occur. Treatment can stop or prevent episodes of fast heartbeats. A catheter-based procedure (ablation) can permanently correct the heart rhythm problems."
- The Mayo Clinic