Study Status: Completed
Recruit Status: Completed
Study Type: Observational
Official Title: A Follow Up Investigation For Patients Completing Study A1481276 To Investigate Developmental Progress 12 And 24 Months Following Completion Of Sildenafil Treatment
Brief Summary: This single center study will monitor the developmental progress of PPHN patients who received iv sildenafil in study A1481276. Two visits will be conducted, at 12 and 24 months following the end of study drug infusion.