to evaluate the role of doppler ultrasound in accurately quantitating patients with valvar pulmonary stenosis , we studied 30 patients ( 20 patients undergoing balloon pulmonary valvoplasty before and after the procedure , and 10 patients who had previously undergone pulmonary balloon valvoplasty ) by doppler echocardiography and cardiac catheterization .
C0220825
evaluate
C0184661
procedure