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November 25, 2009
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Wolff-Parkinson-White Syndrome

What is Wolff-Parkinson-White syndrome?

Wolff-Parkinson-White syndrome is a condition characterized by abnormal electrical pathways in the heart that cause a disruption of the heart's normal rhythm (arrhythmia).

The heartbeat is controlled by electrical signals that move through the heart in a highly coordinated way. A specialized cluster of cells called the atrioventricular node conducts electrical impulses from the heart's upper chambers (the atria) to the lower chambers (the ventricles). Impulses move through the atrioventricular node during each heartbeat, stimulating the ventricles to contract slightly later than the atria.

What are the symptoms of Wolff-Parkinson-White syndrome

People with Wolff-Parkinson-White syndrome are born with an extra connection in the heart, called an accessory pathway, that allows electrical signals to bypass the atrioventricular node and move from the atria to the ventricles faster than usual. The accessory pathway may also transmit electrical impulses abnormally from the ventricles back to the atria. This extra connection can disrupt the coordinated movement of electrical signals through the heart, leading to an abnormally fast heartbeat (tachycardia) and other arrhythmias. Resulting symptoms include dizziness, a sensation of fluttering or pounding in the chest (palpitations), shortness of breath, and fainting (syncope). In rare cases, arrhythmias associated with Wolff-Parkinson-White syndrome can lead to cardiac arrest and sudden death. The most common arrhythmia associated with Wolff-Parkinson-White syndrome is called paroxysmal supraventricular tachycardia.

What are the complications of Wolff-Parkinson-White syndrome?

Complications of Wolff-Parkinson-White syndrome can occur at any age, although some individuals born with an accessory pathway in the heart never experience any health problems associated with the condition.



Next: What other heart conditions is Wolff-Parkinson-White syndrome associated with? »

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Wolff-Parkinson-White Syndrome

What is paroxysmal supraventricular tachycardia (PSVT)?

Normally, an electrical signal is generated in special pacemaker cells in the upper chamber (atrium) of the heart. This impulse causes the atrium to beat in a coordinated fashion and push blood into the ventricles (the lower heart chambers). The electrical signal continues to a junction box between the atrium and ventricle (the AV node), where there is a slight delay. This allows the atrium to contract and send blood to the ventricle. The signal continues throughout the ventricles and causing them to beat and push blood to the body.

In paroxysmal supraventricular tachycardia (PSVT), abnormal conduction of that electricity causes the atrium, and secondarily the ventricles, to beat very rapidly. It is paroxysmal, because the rapid rate can occur sporadically and without warning. It may last a few seconds or many hours. Often the PSVT resolves before the patient reaches a healthcare provider...

Read the Paroxysmal Supraventricular Tachycardia (PSVT) article »










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