Perfusion Index-Bedside Diagnosis of Hemodynamically Significant Patent Ductus Arteriosus.

Background: Patent ductus arteriosus (PDA) is a significant problem in preterm babies <34 weeks old. Echocardiogram (echo) is the gold standard for diagnosing PDA. Perfusion index (PI) using a pulse oximeter could aid in diagnosing a hemodynamically significant PDA (HsPDA).