Early Cardiopulmonary Physiology, Patent Ductus Arteriosus Characteristics, and Outcomes at the Limits of Viability.
OBJECTIVE To examine associations of center-specific, clinically assigned early clinical-hemodynamic patent ductus arteriosus (PDA) phenotypes and echocardiographic characteristics with in-hospital outcomes among infants born at 21-24 weeks' gestation. STUDY DESIGN Retrospective, single-center cohort of infants under...