# Ventricular Septal Defect

Use echocardiography to define ventricular septal defect anatomy and hemodynamic effect, then distinguish patients suitable for observation from those needing congenital heart disease team assessment for surgical or transcatheter closure.

**Clinical question:** How should clinicians assess VSD hemodynamics and select observation, surgical closure, or transcatheter closure?

Updated: 2026-09-15T23:08:30.510875+00:00

## What matters in practice
- Transthoracic echocardiography is the central test to define VSD anatomy, ventricular consequences, and Doppler hemodynamics; invasive catheterization can quantify Qp/Qs and pulmonary resistance when needed for intervention planning.[7][11][12]
- A large VSD becomes hemodynamically important as pulmonary vascular resistance falls relative to systemic vascular resistance; a PVR:SVR ratio below 0.5:1 is associated with significant left-to-right shunting.[18]
- Perimembranous transcatheter VSD closure requires congenital heart disease multidisciplinary selection and operators with immediate access to emergency cardiac surgical support.[23]
- Device closure of perimembranous VSD carries risks including complete heart block, new conduction abnormalities, valve regurgitation or stenosis, and device embolization; ECG surveillance is integral to follow-up.[21]

## Define anatomy, shunt burden, and ventricular consequences

The initial objective is to establish whether the VSD is anatomically simple and hemodynamically tolerated or requires closure planning.

Obtain transthoracic echocardiography with two-dimensional imaging and color/spectral Doppler to localize the defect, characterize its relation to adjacent valves, assess chamber consequences, and estimate shunt hemodynamics. Echocardiography is the principal modality for VSD evaluation; Doppler-derived hemodynamic assessment can include shunt flow calculations.[7][11]

When noninvasive imaging does not adequately resolve shunt magnitude or pulmonary vascular status before a closure decision, perform cardiac catheterization to measure pulmonary and systemic flow ratio (Qp/Qs) and pulmonary-to-systemic resistance ratio (Rp/Rs). These measures have been used to derive a hemodynamic index in children with isolated VSD.[12] A reported catheterization example of a clinically important VSD demonstrated Qp:Qs 3.0:1 with pulmonary vascular resistance 2.3 Wood units, illustrating how invasive measurements integrate shunt volume and pulmonary vascular load rather than defect diameter alone.[16]

Interpret physiology in relation to pulmonary vascular resistance. In large VSDs, significant left-to-right shunting develops when PVR relative to systemic vascular resistance falls below 0.5:1; this explains why hemodynamic burden may evolve as pulmonary vascular physiology changes.[18]
- Use echocardiography to determine whether the defect is perimembranous, muscular, or conal/supracristal, because anatomic relation to valves and conduction tissue changes closure feasibility and risk.[7][14][19]
- Escalate to catheterization when Qp/Qs or pulmonary resistance will change the decision to close a VSD or the choice of procedure.[12][16]

*Testing decisions in ventricular septal defect.[7][11][12][16][18]*

| Clinical question | Test | Result that changes the next step |
| --- | --- | --- |
| Where is the VSD and what structures may be affected? | Transthoracic echocardiography with color and spectral Doppler | Defines VSD anatomy and assesses ventricular and valvular consequences for surveillance versus closure evaluation.[7][11] |
| Is the shunt hemodynamically substantial? | Doppler hemodynamic assessment; catheterization when needed | Qp/Qs quantifies pulmonary-to-systemic flow and informs intervention planning.[11][12] |
| Is pulmonary vascular load acceptable for closure assessment? | Cardiac catheterization | Measure pulmonary vascular resistance and Rp/Rs alongside Qp/Qs; interpret in the context of the individual lesion and planned intervention.[12][16] |
| Why may shunt severity increase over time in a large VSD? | Hemodynamic assessment of relative vascular resistance | A PVR:SVR ratio below 0.5:1 is associated with significant left-to-right shunting in large VSD.[18] |

## Match VSD anatomy to surveillance and closure planning

The closure approach depends on VSD location, multiplicity, and proximity to the aortic and tricuspid valves or conduction tissue.

Perimembranous VSD is the lesion category specifically addressed in transcatheter closure guidance. Patient selection should occur through a multidisciplinary team that includes an interventional cardiologist and cardiac surgeon with congenital heart disease expertise, with particular caution in children and asymptomatic patients.[23]

Muscular VSDs may be multiple. In complex “Swiss cheese” ventricular septation, more than one occlusion device has been used to obtain near-complete closure; this anatomy should prompt planning at a center experienced with complex congenital structural interventions rather than a single-device assumption.[4]

Conal (supracristal) VSD assessment should include careful echocardiographic review and, where required, catheterization and operative evaluation. In a surgical series, aortic valve abnormalities were present preoperatively in 72% of patients, making valve-focused imaging consequential when this anatomic subtype is suspected.[19]
- For any anatomy considered for transcatheter closure, confirm that the operator is trained in the technique and complication management and that emergency cardiac surgical access is available.[23]
- If a VSD lies adjacent to valve tissue or there is pre-existing valve dysfunction, define the valve lesion before choosing a device-based approach because new aortic or tricuspid regurgitation has been reported after perimembranous device closure.[21]

*Anatomic features that alter VSD closure planning.[4][19][21][23]*

| Anatomic pattern | Planning concern | Action |
| --- | --- | --- |
| Perimembranous VSD | Device proximity to the conduction system and atrioventricular valves; complete heart block and valvular complications have been reported after device closure.[21] | Use congenital multidisciplinary selection and a program with emergency surgical capability.[23] |
| Multiple muscular VSDs (“Swiss cheese”) | A single device may not address all communications.[4] | Refer for complex congenital interventional or surgical planning; multiple devices have been used in selected cases.[4] |
| Conal/supracristal VSD | Aortic valve abnormalities were identified preoperatively in 72% in one surgical series.[19] | Perform targeted aortic valve assessment during anatomic definition and incorporate valve findings into procedural planning.[19] |

## Choose closure strategy through congenital heart disease expertise

Closure is a structural decision requiring anatomic suitability, hemodynamic assessment, and a plan for procedural rescue and rhythm follow-up.

For perimembranous VSD, transcatheter endovascular closure may be undertaken when selected patients have been evaluated within a multidisciplinary congenital heart disease program. Guidance specifies that children should undergo the procedure only in specialist pediatric cardiology units; across ages, the procedure should be performed by cardiologists trained in both implantation and complication management, with access to emergency cardiac surgery.[23]

Do not treat transcatheter closure as interchangeable with surgery for every VSD anatomy. Surgical management remains relevant when anatomy is complex, when multiple defects require a tailored strategy, or when adjacent aortic valve pathology requires direct operative assessment or repair.[4][19]

Counsel explicitly about conduction and device-related complications before perimembranous device closure. Reported series using Amplatzer devices described complete heart block from 0% to 1.9%, left bundle branch block from 0% to 4%, aortic regurgitation from 0% to 4%, tricuspid regurgitation from 0% to 8%, tricuspid stenosis from 0% to 0.9%, and device embolization from 0% to 7.7%.[21]
- Document a baseline ECG before device closure and obtain post-procedure ECG follow-up, because complete heart block occurred immediately in 1.07% and conduction abnormalities persisted or appeared at least 3 months after closure in a focused ECG case series.[21]
- Involve cardiac surgery before device closure rather than only after a complication occurs; emergency surgical access is a stated procedural requirement.[23]

*Reported complications after transcatheter perimembranous VSD closure with Amplatzer devices.[21]*

| Complication | Reported range | Clinical response |
| --- | --- | --- |
| Complete heart block | 0% to 1.9%; 1.07% immediately in one ECG-focused series.[21] | Perform baseline and follow-up ECG assessment; ensure capability for urgent complication management.[21][23] |
| Left bundle branch block | 0% to 4%.[21] | Assess new conduction changes after implantation and during follow-up.[21] |
| Aortic regurgitation | 0% to 4%.[21] | Reassess aortic valve function by echocardiography after closure.[21] |
| Tricuspid regurgitation | 0% to 8%.[21] | Reassess tricuspid valve function by echocardiography after closure.[21] |
| Tricuspid stenosis | 0% to 0.9%.[21] | Evaluate valve gradients if post-procedure findings suggest obstruction.[21] |
| Device embolization | 0% to 7.7%.[21] | Perform closure only where operators and emergency cardiac surgical services can manage device complications.[23] |

## Follow repaired and unrepaired VSDs for rhythm, valve, and infection-related complications

Follow-up intensity should reflect anatomy, residual hemodynamics, repair status, and new clinical events.

After transcatheter closure, reassess device position, residual shunt, and aortic and tricuspid valve function by echocardiography, and obtain ECG surveillance for new atrioventricular or intraventricular conduction abnormalities. In reported series, new complete right bundle branch block, incomplete right bundle branch block, and left anterior hemiblock were documented at least 3 months after perimembranous closure.[21]

Refer adults with moderate or complex congenital heart disease to dedicated adult congenital heart disease care. Contemporary adult congenital guidance emphasizes management of moderate and complex lesions in dedicated centers with specialized training pathways.[8]

Maintain a low threshold to evaluate fever with blood cultures and echocardiography when endocarditis is clinically suspected in patients with prior device closure, because transcatheter device closure of atrial or ventricular septal defects is associated with infective endocarditis risk.[3]
- New palpitations, syncope, bradycardia, or ECG conduction change after device closure should trigger prompt congenital cardiology review because complete heart block is a recognized complication.[21]
- In an adult with prior VSD or another congenital lesion and ischemic stroke, assess conventional and congenital mechanisms, including atrial arrhythmia by ECG; atrial fibrillation/flutter was defined by ECG or diagnostic documentation in an adult congenital stroke cohort.[9]

*Post-closure surveillance targets.[3][21][8]*

| Target | Modality | Finding requiring escalation |
| --- | --- | --- |
| Conduction system | ECG | New atrioventricular block, bundle branch block, or hemiblock after closure warrants congenital cardiology assessment.[21] |
| Device and residual shunt | Echocardiography | Residual flow or concern for device position should prompt structural congenital heart disease review.[21] |
| Valve function | Echocardiography | New or worsening aortic or tricuspid regurgitation or tricuspid stenosis requires reassessment of closure consequences.[21] |
| Infective endocarditis | Blood cultures and echocardiography when clinically suspected | Fever or embolic/infectious findings after device closure require endocarditis evaluation.[3] |
| Longitudinal congenital care | Adult congenital heart disease program | Moderate or complex disease should be managed in a dedicated center.[8] |

## Common questions

### When is contrast echocardiography useful for suspected VSD?

Peripheral contrast echocardiography has been described as a highly specific real-time echocardiographic method for demonstrating VSD flow, but routine anatomic and hemodynamic characterization remains centered on standard two-dimensional and Doppler echocardiography.[17][7]

## References
1. Leveraging artificial intelligence for predicting spontaneous closure ... — www.thelancet.com — https://www.thelancet.com/journals/landig/article/PIIS2589-7500(24)00245-0/fulltext
2. Atrial septal defects - The Lancet — www.thelancet.com — https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(13)62145-5/fulltext
3. Infective endocarditis - The Lancet — www.thelancet.com — https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)01098-5/fulltext
4. Closing down: transcatheter closure of intracardiac defects ... - Heart — heart.bmj.com — https://heart.bmj.com/content/90/12/1505
5. Transcatheter closure of atrial septal defect in the elderly - Heart — heart.bmj.com — https://heart.bmj.com/content/109/23/1741
6. Management of Stroke in Infants and Children — stroke.ahajournals.org — https://stroke.ahajournals.org/doi/10.1161/strokeaha.108.189696
7. Echocardiographic evaluation of ventricular septal defects — journals.lww.com — https://journals.lww.com/00009183-202012000-00033
8. The grown-up congenital heart disease dilemma in... : Annals of Pediatric Cardiology — journals.lww.com — https://journals.lww.com/aopc/fulltext/2025/03000/the_grown_up_congenital_heart_disease_dilemma_in.1.aspx
9. Ischemic Stroke in Adults With Congenital Heart... : Journal of the American Heart Association — journals.lww.com — https://journals.lww.com/01709764-202413190-00013
10. Neurodevelopmental Outcomes in Children With Congenital Heart ... — journals.lww.com — https://journals.lww.com/TDOJ/00003017-201208280-00021.fulltext
11. Practical Cardiovascular Medicine - Wiley Online Library — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/pdf/10.1002/9781119233503.index
12. Determination of the anatomical size of ventricular septal defects on ... — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/10.1002/ccd.1810220205
13. 2021 ESC Guidelines for the diagnosis and treatment of acute and ... — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/10.1002/ejhf.2333
14. Ventricular Septal Defect - Wiley Online Library — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/pdf/10.1002/9781444398786.ch23
15. Beta‐blockers for congestive heart failure in children - Alabed, S ... — www.cochranelibrary.com — https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD007037.pub4/references
16. Ventricular Septal Defect Noted by Two ... - CHEST Journal — journal.chestnet.org — https://journal.chestnet.org/article/S0012-3692(16)39815-4/pdf
17. Ventricular Septal Defect Noted by Two-Dimensional ... — journal.chestnet.org — https://journal.chestnet.org/article/S0012-3692(16)39815-4/fulltext
18. PART 2: ANSWERS CARDIOLOGY - AAP Publications — publications.aap.org — https://publications.aap.org/books/chapter-pdf/1908258/aap_9781610028882-part02-cardiology.pdf
19. Surgical management of the conal (supracristal) ventricular septal ... — www.jtcvs.org — https://www.jtcvs.org/article/S0022-5223(19)36562-6/pdf
20. Page numbers followed by an f, a t, or a b denote a figure, a table, or ... — publications.aap.org — https://publications.aap.org/book/chapter-pdf/782362/aap_9781610021456-index.pdf
21. [PDF] HTG213 Transcatheter endovascular closure of perimembranous ... — www.nice.org.uk — https://www.nice.org.uk/guidance/htg213/evidence/overview-pdf-314333101
22. [PDF] NATIONAL INSTITUTE FOR HEALTH AND CARE EXCELLENCE — www.nice.org.uk — https://www.nice.org.uk/guidance/htg357/documents/telemetric-adjustable-pulmonary-artery-banding-for-reducing-pulmonary-hypertension-in-infants-with-congenital-heart-defects-overview-2
23. [PDF] HTG325 Percutaneous closure of patent foramen ovale to prevent ... — www.nice.org.uk — https://www.nice.org.uk/guidance/htg325/evidence/overview-final-pdf-13544757757
24. Anaesthetic implications of grown-up congenital heart disease — www.bjanaesthesia.org — https://www.bjanaesthesia.org/article/S0007-0912(17)35600-3/fulltext

## Editorial note

Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.