55. Can we assess the success of balloon pulmonary valvuloplasty by ECG

IntroductionThe gold standard for diagnosis of pulmonary stenosis (PS) is by echocardiography. P wave dispersion (PWD) indicates the spreading of the sinus stimulus in the atria.Aim of the workStudy the effect of PS and its treatment by BPV on electrocardiographic (ECG) parameters as PWD and P wave amplitude.Patient & MethodsPatients with moderate or severe valvular PS was enrolled in the study. PWD and maximum P amplitude (max P amplitude) on ECG were measured. The peak systolic pressure gradients (SPG) over the pulmonary valve were obtained. All cases were underwent BPV. Reassessment of SPG and ECG parameters were done immediately and one month later.ResultsForty two patients were recruited .Their age ranged from 3 to 38years. PWD before balloon had mean±SD (0.06±0.017). It decreased significantly to (0.04±0.017) and (0.04±0.013) immediately and One month after balloon respectively (p value 0.001 ). The max P amplitude had mean±SD before balloon (0.08±.027) and it decreased significantly to (0.07 ±0.025) 1month later (p value 0.013). There was significant correlation between SPG and PWD (p value