A Non-Interventional Follow Up Study For Subjects Who Received Sildenafil for Persistent Pulmonary Hypertension of the Newborn (PPHN)

A Follow Up Investigation For Patients Completing Study A1481276 To Investigate Developmental Progress 12 And 24 Months Following Completion Of Sildenafil Treatment

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.

This study will monitor developmental progress of PPHN patients for 2 years following study treatment, using Bayley III and Hammersmith tools. Data will be explored with descriptive statistics.

Inclusion Criteria:

• Any subject who received sildenafil treatment in study A1481276.
• Signed and dated informed consent document by legal guardian.

Exclusion Criteria:

• Any subject who did not receive sildenafil treatment during study A1481276.