The purpose of this study is to determine whether Non Invasive Ventilation are effective in prevention of reperfusion pulmonary edema after pulmonary artery angioplasty. Our hypothesis is that administration of Non Invasive Ventilation during the procedure and systematically in post procedure period is a protective factor against the development and severity of reperfusion pulmonary edema.

Inclusion criteria:

• Age ≥ 18 years
• First and /or second procedure of pulmonary artery angioplasty
• Mean pulmonary arterial pressure ≥ 40 mmHg and/or pulmonary vascular resistance ≥ 8 WU (Wood unit)
• Patient who signed informed consent
• Patients affiliated to a social security program

Exclusion criteria:

• severe neurological disease: Coma Glasgow Scale < 8, severe cognitive decline, postural instability, loss of autonomy.
• psychiatric disease (illness)
• sepsis, severe sepsis and septic shock, according to definitions and diagnostic criteria for sepsis of 'Surviving Sepsis Campaign 2012'
• severe respiratory failure defined by a total lung capacity (TLC)< 50% of the predicted value and/or expiratory volume in 1 second (FEV) < 30% of predicted value
• obstructive sleep apnea syndrome with Continuous Positive Airway treatment
• preexisting hemorrhagic syndrome or coagulation factors deficiency
• severe renal insufficiency with glomerular filtration rate < 30 ml/min
• severe hepatic failure with hepatic encephalopathy, hemodynamic disorder, decompensates cirrhosis, metabolic disorder( metabolic acidosis, hypoglycemia) hepatorenal syndrome, coagulation disorder (factor V< 50%,disseminated intravascular coagulation)
• patient refusal of participation in the study program
• subjects not affiliated to social security program