A Patent Ductus Arteriosus (PDA) occurs when the ductus arteriosus remains patent after birth rather than undergoing the normal process of closure. The significance of a PDA depends upon its size, the age of the patient, pulmonary vascular resistance and the pressure difference between the systemic and pulmonary circulations. Immediately after birth, the direction of … Continue reading Patent Ductus Arteriosus — PDA ASD & VSD