الفهرس 
PULMONARY VALVEOnly 14 pages are availabe for public view
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Abstract
Pulmonary valve stenosis may interfere with the growth and development of the lung and cause pressure overload on the right heart. This may predispose the patient to cardiac failure, limited exercise tolerance, and arrhythmias.The QT interval is the duration between onset of the QRS complex and the end of the T wave in an electrocardiogram (ECG) and reflects the repolarization time of the myocardium. QT dispersion is the difference in repolarization duration among several electrocardiographic leads and reflects local differences in recovery time of the myocardium. Studies have shown that the heart rate-corrected QT interval (QTc) and QTc dispersion (QTcd) are prolonged and associated with ventricular arrhythmia and an increase in sudden death in a variety of diseases such as coronary heart disease, heart failure, hypertension and diabetes mellitus.In this study we assessed QTc and QTcd in patients with different degrees of pulmonary stenosis. The present study hypothesizes that QTc and QTcd are increased in patients with pulmonary stenosis and are related to the degree of severity of pulmonary stenosis.