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Wolff-Parkinson-White Syndrome

In a normal heart, electrical signals use only one path whilst moving through the heart. This is the atrio-ventricular or A-V node. As the electrical signal moves from the hearts upper chambers (the atria) to the lower chambers (the ventricles), it causes the heart to beat. For the heart to beat properly, the timing of the electrical signal is important. If there is an extra conduction pathway, the electrical signal may arrive at the ventricles too soon. This condition is called Wolff-Parkinson-White syndrome (WPW).

It is in a category of electrical abnormalities called "pre-excitation syndromes." It is recognized by certain changes on the electrocardiogram, a graphical record of the heart's electrical activity. The ECG will then show that an extra pathway or shortcut exists from the atria to the ventricles. Many people with this syndrome have symptoms or episodes of tachycardia (rapid heart rhythm) may also have dizziness, chest palpitations, fainting and, rarely, cardiac arrest. Other people with WPW never have tachycardia or other symptoms.

About eight percent of people with symptoms first have them between the ages of eleven and fifty. People without symptoms usually don't need treatment. People with episodes of tachycardia can often be treated with medication. But sometimes such treatment doesn't work. If the treatment doesn’t work they will need to do something else. The most common procedure used to interrupt the abnormal pathway, is radiofrequency or catheter ablation. In this, a flexible tube called a catheter is guided to the place where the problem exists. Then that tissue is destroyed with radiofrequency energy, stopping the electrical pathway. Successful ablation ends the need for medication. Whether a person will be treated with medication or with an ablation procedure depends on several factors.

These include the severity and frequency of symptoms, risk for future arrhythmias and patient preference.


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