PDA Post NICU Discharge

Inclusion Criteria: * Documentation of informed consent and authorization for participation. * Estimated gestational age of 32 weeks or less. * Active diagnosis of a PDA at discharge. * At least one echocardiogram obtained during hospital stay documenting/ confirming PDA diagnosis. * Parental agreement to provide follow-up information on their child. * Cardiologist and/or Pediatrician willing to provide follow-up information on enrolled infants. Exclusion Criteria: * No known major congenital anomalies (inborn error of metabolism, cyanotic congenital heart disease, gastroschisis, omphalocele, diaphragmatic hernia or other major gastrointestinal anomalies, major neurological injury or anomaly, multiple congenital anomalies). * Chromosomal / genetic disorders - Inherited metabolic disorders (Aa, fat or carbohydrate), Trisomies, Turner's syndrome,Vater's syndrome, CHARGE, DiGeorge or other 22q11 deletions, Major chromosomal duplications, deletions detectable on high resolution karyotype (not microarray). * Parent(s) unwilling to participate in follow-up.