The VSD medical abbreviation stands for ventricular septal defect, an opening in the muscular wall, called the septum, that separates the heart's two lower chambers. Among heart differences present at birth it ranks near the top in frequency, and it turns up on newborn exams, pediatric cardiology notes and echocardiogram reports.
Many small VSDs close on their own during childhood, while larger ones may need medicine or repair. VSD can also occur in adults as a rare complication after a heart attack. This page explains the types named on reports, how to read an echo line, and how VSD compares with other septal openings.
At a glance
Stands for
Ventricular septal defectSpecialty
Pediatric cardiology, cardiology, cardiac surgeryMain types
Perimembranous (most common), muscular, inlet, outletUsual first clue
A heart murmur heard on a routine examMain test
Echocardiogram (heart ultrasound)Do not confuse with
ASD, an opening between the upper chambers
What the VSD medical abbreviation describes
The left ventricle pumps oxygen rich blood to the body under high pressure, and the right ventricle pumps blood to the lungs at lower pressure. When there is a hole between them, some blood flows from left to right with each beat. That extra blood goes back through the lungs, so the heart and lungs work harder than usual.
How much this matters depends mostly on size. A small VSD lets only a little blood across and often causes nothing more than a loud murmur. A large one can lead to fast breathing, sweating with feeds, poor weight gain and, if untreated over time, damage to the lung blood vessels.
Types named on an echo report
| Type | Location | Notes |
|---|---|---|
| Perimembranous | Near the thin upper part of the septum | The most common type |
| Muscular | In the thick lower muscular wall | Often small and many close on their own |
| Inlet | Near the valves between upper and lower chambers | Seen with some genetic conditions |
| Outlet | Just below the great arteries | Can affect the aortic valve |
Reports often add the size in millimeters, the direction of flow, and the pressure difference across the hole, which helps cardiologists judge its effect.
Decoding a sample echo line
Pediatric echo: "Small perimembranous VSD with L to R shunt, normal LV size, no pulmonary hypertension." There is a small hole in the common location, blood flows from the left side to the right, the left ventricle is not enlarged and lung pressures look normal. That pattern is often followed with periodic checkups.
The word restrictive may also appear, meaning the hole is small enough to keep a large pressure difference between the two ventricles, which generally points to less extra flow.
VSD compared with other heart openings
| Term | What is open |
|---|---|
| VSD | Wall between the two ventricles |
| ASD | Wall between the two atria |
| PFO | A flap between the atria that did not seal after birth |
| PDA | A fetal blood vessel between the aorta and pulmonary artery that stayed open |
VSD is also one of the four features of tetralogy of Fallot, a more complex congenital defect. In adults, a new VSD after a large heart attack (see AMI) is a rare emergency called post infarction ventricular septal rupture.
Follow up and treatment in broad strokes
Small VSDs are often simply watched, with echocardiograms spaced out as the child grows. Babies with larger defects may receive medicines such as diuretics to ease fluid buildup and extra calories to support growth. Surgical repair with a patch, or in some cases a catheter based device, is considered when the hole is large, causing symptoms, or affecting nearby valves. Clinicians also discuss dental care and infection risk depending on the repair. For septal defects and many other conditions written in short form, open our diagnosis abbreviations hub page.
Questions parents often bring
- How big is the VSD and where is it?
- Is it likely to close on its own?
- Which signs, such as fast breathing or poor feeding, should prompt a call?
- How often will my child need an echocardiogram?
Every VSD is a little different. Your child's pediatric cardiologist can explain how this particular defect is expected to behave and what follow up it needs.
Frequently asked questions
What does VSD mean in medical terms?
VSD means ventricular septal defect, an opening in the septum dividing the right and left ventricles. Most are present from birth.
Can a VSD close on its own?
Many small VSDs, especially muscular ones, close or get smaller during early childhood. Larger defects are less likely to close and may need repair.
Does hole in the heart always mean a VSD?
Not always. A VSD is one kind, while an ASD and a PFO are openings between the upper chambers, so the term hole in the heart can refer to any of these.
How is a VSD found?
A heart murmur on a routine exam is often the first sign. An echocardiogram confirms the defect and shows its size and location.