PDA
Also written as: PDA — patent ductus arteriosus
Patent ductus arteriosus, a congenital heart condition where fetal blood vessel fails to close after birth.
Full Definition
PDA (patent ductus arteriosus) is a congenital heart condition characterized by the persistence of the ductus arteriosus, a normal fetal blood vessel that should close shortly after birth. In fetal circulation, this vessel allows blood to bypass the lungs, but its failure to close postnatally creates an abnormal connection between the aorta and pulmonary artery. This results in increased blood flow to the lungs and extra work for the heart. PDA is particularly common in premature infants due to immature vessel walls and altered prostaglandin sensitivity. Small PDAs may be asymptomatic, while larger ones can cause heart failure, feeding difficulties, and poor growth. Treatment options include medication, catheter-based closure, or surgical ligation.
Usage
Usage note: Can be confused with PDA meaning 'personal digital assistant' in non-medical contexts.
In Context
- "Echocardiography confirmed a moderate PDA with left-to-right shunting." — Cardiology consultation
- "Indomethacin therapy was unsuccessful in closing the PDA." — Treatment response note