 Guidewires were then advanced through the respective venous sheath into the branch pulmonary arteries and simultaneous balloon pulmonary arterioplasty was performed using the two Z-Med 12 x 4 cm balloon catheter was advanced into the branch of pulmonary arteries and inflated maximally to 9 hemispheres of pressure on 5 occasions near complete disappearance of proximal waist. 
Guidewires were then advanced through the respective venous sheath into the branch pulmonary arteries and simultaneous balloon pulmonary arterioplasty was performed using the two Z - Med 12 x 4 cm balloon catheter was advanced into the branch of pulmonary arteries and inflated maximally to 9 hemispheres of pressure on 5 occasions near complete disappearance of proximal waist .