The PDA medical abbreviation most often means patent ductus arteriosus, a blood vessel near the heart that should close soon after birth but stays open. Patent here means open, and the ductus arteriosus is a short channel that lets blood skip the lungs before a baby is born.
In cardiology PDA has a second, unrelated meaning: the posterior descending artery, a coronary artery on the underside of the heart. And in autism discussions, PDA is used for pathological demand avoidance, a described behavior profile. Below you will find each meaning, how to tell them apart, and sample lines from newborn and heart catheter reports.
At a glance
Stands for
Patent ductus arteriosus (newborn and pediatric heart care)Other meanings
Posterior descending artery (adult cardiology); pathological demand avoidance (autism context)Latin roots
Patens, open; ductus, a channel; arteriosus, of an arteryMost common in
Premature babiesUsual test
Echocardiogram (heart ultrasound)Related defects
The PDA medical abbreviation in newborn care
A fetus takes its oxygen through the umbilical cord, while its lungs stay folded and filled with fluid. The ductus arteriosus connects the pulmonary artery to the aorta so most blood bypasses the lungs. After birth, when the baby starts breathing, this channel normally closes within the first days. When it stays open, it is a patent ductus arteriosus.
An open ductus lets some blood flow back toward the lungs, called a left to right shunt. A small PDA may cause no symptoms and close by itself. A larger one can overwork the heart and lungs and cause fast breathing, poor feeding or slow weight gain. It is much more common in babies born early. Doctors may hear a continuous murmur and confirm it with an echocardiogram.
PDA medical abbreviation cardiology meaning: the posterior descending artery
In adult heart reports, PDA usually means the posterior descending artery, which runs along the bottom surface of the heart and feeds the back part of the wall between the ventricles. It most often branches from the right coronary artery. You will see it in catheterization and bypass reports, for example "70% stenosis of the PDA" or a bypass graft listed to the PDA.
Cath report: "RCA dominant, PDA with mild disease, no intervention." Here PDA is a coronary artery, not an open fetal vessel. The setting, an adult catheterization, makes that clear.
Reading a PDA line in a newborn note
| Words in the note | Meaning |
|---|---|
| Preterm infant | Baby born before 37 weeks |
| small PDA on echo | A narrow open ductus seen on heart ultrasound |
| left to right shunt | Extra blood flowing from the aorta toward the lungs |
| monitor | Watch and repeat checks rather than treat right away |
Treatment, when needed, can include medicines given to encourage closure, a catheter procedure that plugs the vessel, or surgery. The team chooses based on the baby's size, age and symptoms.
PDA in autism discussions
Parents searching for PDA and autism will meet pathological demand avoidance, sometimes reframed as a pervasive drive for autonomy. It describes a profile in which everyday requests trigger strong anxiety and avoidance. It is discussed mainly in autism communities and some clinical settings, but it is not a separate diagnosis in the main diagnostic manuals used in the US. You may see it in school or therapy reports rather than in hospital charts, which is why a search for the PDA medical abbreviation autism link turns up this meaning.
Families with questions about this profile can raise it with the clinician who assessed their child. For the autism spectrum itself, see ASD, keeping in mind ASD also means atrial septal defect in heart care.
Heart defect abbreviations that sit beside PDA
| Abbreviation | Meaning | Where the opening is |
|---|---|---|
| PDA | Patent ductus arteriosus | Between the aorta and pulmonary artery |
| VSD | Ventricular septal defect | Wall between the lower chambers |
| ASD | Atrial septal defect | Wall between the upper chambers |
| PFO | Patent foramen ovale | A flap between the upper chambers |
All of these are forms of congenital heart disease, often written CHD. Further heart and newborn terms sit in the diagnosis abbreviations collection.
These explanations are general. Your baby's neonatal or cardiology team can tell you what a PDA finding means in your child's case.
Frequently asked questions
What does PDA mean for a baby?
For a newborn, PDA means patent ductus arteriosus, a blood vessel that normally closes after birth but has stayed open. Many small ones close without treatment, especially in full term babies.
What does PDA mean in cardiology?
It depends on the patient. In children it usually means patent ductus arteriosus, while in adult coronary reports it usually means the posterior descending artery.
Is a PDA the same as a hole in the heart?
Not exactly. A PDA is an open blood vessel outside the heart chambers, while a hole in the heart usually refers to an ASD or VSD in the walls between chambers. All are grouped as congenital heart defects.
Does PDA stand for something in autism?
In autism discussions PDA means pathological demand avoidance, a described profile of strong avoidance of everyday demands. It is not a standalone diagnosis in the main US diagnostic manual.