Sildenafil
Medicine
Anesthesia
Placebo
Pulmonary hypertension
Extracorporeal membrane oxygenation
Oxygenation index
Fraction of inspired oxygen
cGMP-specific phosphodiesterase type 5
Randomization
Ductus arteriosus
Oxygenation
Randomized controlled trial
Mechanical ventilation
Internal medicine
Alternative medicine
Pathology
