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Wolff–Parkinson–White syndrome
Wolff–Parkinson–White syndrome (WPW) is one of several disorders of the electrical system of the heart that are commonly referred to as pre-excitation syndromes.
WPW is caused by the presence of an abnormal accessory electrical conduction pathway between the atria and the ventricles. Electrical signals traveling down this abnormal pathway (known as the bundle of Kent) may stimulate the ventricles to contract prematurely, resulting in a unique type of supraventricular tachycardia referred to as an atrioventricular reciprocating tachycardia.
WPW affects between 0.1% and 0.3% in the population. Sudden cardiac death in people with WPW is rare (less than 0.6%), and is usually caused by the propagation of an atrial tachydysrhythmia (rapid and abnormal heart rate) to the ventricles by the accessory pathway.〔
==Signs and symptoms==
People with WPW are usually asymptomatic. However, the individual may experience palpitations, dizziness, shortness of breath, or syncope (fainting or near fainting) during episodes of supraventricular tachycardia. The telltale "delta wave" may sometimes—but not always—be seen on an electrocardiogram (ECG/EKG).
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