Symptoms of WPW syndrome may arise at any point in a person's life, appearing and sometimes disappearing abruptly, and the frequency and severity vary. Symptoms occur during episodes of rapid heart rate or abnormal heart rhythm and may last several minutes to several hours. In addition to heartbeat irregularity, common symptoms include difficulty breathing, fainting, chest pain, lethargy, and dizziness. Some people with Wolff-Parkinson-White syndrome experience no symptoms at all.

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