Wolff Parkinson White Syndrome (WPW)-- a fairly rare heart condition in which an extra electrical pathway between the atria and ventricles causes tachycardia. The extra pathway is present at birth and is detected in about 4 out of every 100,000 people. The episodes of tachycardia usually aren't life-threatening, but serious heart problems can occur. Treatment with ablation can permanently correct the problem.
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