الفهرس 
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Abstract
The normal pulmonary valve consists of three thin and pliable valve leaflets. When the right ventricle ejects blood into the pulmonary artery, the normal pulmonary valve leaflets spread apart easily and cause no obstruction (blockage) to outflow of blood from the heart.Pulmonary stenosis is a condition characterized by obstruction to blood flow from the right ventricle to the pulmonary artery. Stenosis may be valvular, subvalvular, or supravalvular. The most common form of pulmonary stenosis is obstruction at the valve itself, referred to as pulmonary valvar steno sis. P wave dispersion is a new electrocardiogenic marker that has been associated with inhomogeneous and discontinuous propagation of sinus impulse.It can be defined as the difference between maximum and minimum P wave duration.Percutaneous pulmonary valvuloplasty can stretch the pulmonary valve’s walls, enlarging it to improve blood flow. This treatment option involves inserting a catheter that has a balloon on the end that can be inflated and stretch the valve wall and dilate it.
We found that there is significant decrease in PWD after BPV on the 1st day and more decrease on the 30 day Also, there is significant decrease in P amplitude max after BPV which correlate with the DROP in pressure gradient.In conclusion we found that P wave dispersion and p max are increased in PS and it can be used to reflect the severity of stenosis. After BPV there decrease in PWD and P max immediately and more decrease after one month but this decrease is not correlate with the DROP in pressure gradient. Also, amplitude of P wave is increased in patients with PS but there is decrease in P amplitude max after BPV that correlate with DROP in pressure gradient.