Residual VSD — Not All the Same

Date
February 2, 2026
URL
https://x.com/WithAScalpel/status/2018314874636419535?s=20
Categories
VSDTOFIntensive Care

Residual VSD — Not All the Same

image

A “residual VSD” is not a single diagnosis—it is a post-repair physiology whose impact depends on baseline loading conditions, effective shunt magnitude, and co-lesions. The same-size jet can be clinically trivial in one substrate and decisive in another.

1) Why “the same residual VSD” behaves differently across lesions

A. Isolated VSD repair: a volume-adapted circulation

Preoperatively, many patients have high pulmonary blood flow (high Qp/Qs) and chronic LV/LA volume loading. After closure, a small residual L→R shunt often represents only a modest incremental load on an already volume-adapted system—so observation is frequently reasonable when clinical and echo signs remain stable. [1]

B. TOF repair: an underfilled LV suddenly asked to accept volume

In TOF, preoperative effective pulmonary blood flow is often reduced, and the LV may be relatively small/underfilled. After repair, even a “small” residual L→R shunt can increase pulmonary venous return abruptly, creating new LV volume loading in a ventricle that was not conditioned for it—especially when paired with common TOF companions (PR, RV diastolic dysfunction, residual RVOT gradient, TR). This is the essence of your slide: same term, different baseline physiology → different tolerance.

Practical synthesis:

Residual VSD significance ≠ “hole size” alone

It is (effective orifice × pressure gradient × baseline loading state × co-lesions).

2) “Residual VSD” is a category—name the subtype

When you document or discuss a residual VSD, make it specific:

  1. Mechanism
    • Patch margin leak / dehiscence
    • Unrecognized additional muscular VSD
    • Intramural VSD (particularly in conotruncal repairs) [6,7]
  2. Hemodynamic phenotype
    • Restrictive, high-velocity jet (small effective orifice; may still matter in the wrong physiology)
    • Less restrictive / low-velocity shunt (larger effective shunt)
  3. Timing and trajectory
    • Detected intraoperatively vs early postoperative vs late
    • Closing trend vs persistence vs enlargement

Large series confirm two clinically useful themes:

  • Small postoperative residual defects often close spontaneously, especially when very small at discharge. [2–4]
  • Persistence is more likely as size increases, and some defects can enlarge or prompt reintervention. [2,4,6]

3) Natural history and “what size tends to matter” (use size as a guide, not a diagnosis)

Published data support a practical size-stratified mindset:

  • Very small defects frequently close over time after discharge. [2–4]
  • Defects beyond a small range are less likely to close spontaneously and deserve closer surveillance and a lower threshold to intervene if physiology declares itself. [4–6]

Two clinically important nuances from intraoperative work:

  • Intraoperative assessment should not stop at “I see a jet.” Combine color-jet size with hemodynamics, because a borderline jet can be misleading without physiologic confirmation. [6]
  • Conotruncal repairs deserve special suspicion for intramural pathways and late significance, even when early imaging seems modest. [6,7]

4) Evaluation: treat it like a hemodynamic problem, not an imaging finding

Step 1 — Confirm what it is (anatomic/echo definition)

  • Color Doppler: location, number of jets, patch-line relationship
  • CW Doppler: Vmax (helps frame restrictiveness, but does not replace physiology)
  • If the jet behavior seems “off” relative to the patch line, keep intramural VSD on the differential—especially after conotruncal repairs. [6,7]

Step 2 — Quantify what it does (physiologic effect)

Use a simple, repeatable checklist:

A. Volume load

  • LVEDD and LA size trend
  • Tachypnea, feeding intolerance, poor weight gain

B. Pulmonary circulation

  • CXR/clinical pulmonary overcirculation
  • Ventilator/oxygen needs, work of breathing

C. Systemic output

  • Lactate/low-output features, inotrope requirement
  • Diuresis/end-organ perfusion

D. Co-lesions (amplifiers), especially in TOF

  • PR severity, RV size/function, residual RVOT gradient, TR

Step 3 — Decide whether it is hemodynamically significant

Instead of a single cutoff, define “significant” as a residual shunt that is driving:

  • Progressive LV/LA dilation
  • Persistent heart failure physiology or failure to wean support
  • Objective evidence of meaningful shunt on hemodynamic assessment when needed [6]

5) Management: observation vs catheter closure vs reoperation

A. Observation is appropriate when

  • Restrictive jet with stable clinical course
  • No progressive LV/LA enlargement
  • Trajectory suggests stabilization or closure (common for small defects). [2–4]

B. Transcatheter closure is attractive when

  • The defect anatomy is suitable (often patch-margin leaks or accessible tracts)
  • The patient is stable enough for cath, and the shunt is clearly contributory

    • Contemporary series show feasibility, but also emphasize that complications and technical challenges exist, so case selection matters. [8–10]

C. Surgical reintervention is favored when

  • The defect is large, complex, or suspected intramural
  • There are other residual lesions best addressed surgically (common in TOF physiology)
  • Clinical instability requires definitive correction

6) Prevention and “fix it once” principles (the operative mindset)

  1. Intraoperative imaging is not just confirmatory—it is preventive.

    2. Residual shunts should be interpreted with hemodynamics, not only color Doppler. [6]

  2. Conotruncal repairs: assume intramural risk until proven otherwise.

    3. Intramural residual VSDs are a distinct entity associated with worse postoperative course and deserve deliberate recognition and follow-up strategy. [6,7]

  3. Communicate the subtype (patch leak vs intramural vs additional muscular).

    4. Clear labeling improves ICU interpretation, follow-up planning, and the threshold for reintervention.

References

[1] Turner SW, Hornung T, Hunter S. Closure of ventricular septal defects: a study of factors influencing spontaneous and surgical closure. Cardiol Young. 2002 Jul;12(4):357-363. doi: 10.1017/S1047951100012968.

[2] Nakayama Y, Horimoto Y, Suzuki K, Takiguchi M, Ishihara K, Umehara N, Shinkawa T. Clinical Course of Residual Ventricular Septal Defects After Congenital Heart Disease Repair. Pediatr Cardiol. 2025 Jun;46(5):1248-1253. doi: 10.1007/s00246-024-03542-5.

[3] Bibevski S, Ruzmetov M, Mendoza L, Decker J, Vandale B, Jayakumar KA, Chan KC, Bove E, Scholl FG. The Destiny of Postoperative Residual Ventricular Septal Defects After Surgical Repair in Infants and Children. World J Pediatr Congenit Heart Surg. 2020 Jul;11(4):438-443. doi: 10.1177/2150135120918537.

[4] Dodge-Khatami A, Knirsch W, Tomaske M, Prêtre R, Bettex D, Rousson V, Bauersfeld U. Spontaneous closure of small residual ventricular septal defects after surgical repair. Ann Thorac Surg. 2007 Mar;83(3):902-905. doi: 10.1016/j.athoracsur.2006.09.086.

[5] Deng X, Huang P, Luo J, Chen R, Yang G, Chen W, Liu Q, He C. Residual Shunts Following Isolated Surgical Ventricular Septal Defect Closure: Risk Factors and Spontaneous Closure. Pediatr Cardiol. 2020 Jan;41(1):38-45. doi: 10.1007/s00246-019-02218-9.

[6] Yang SG, Novello R, Nicolson S, Steven J, Gaynor JW, Spray TL, Rychik J. Evaluation of ventricular septal defect repair using intraoperative transesophageal echocardiography: frequency and significance of residual defects in infants and children. Echocardiography. 2000 Oct;17(7):681-684. doi: 10.1046/j.1540-8175.2000.00681.x.

[7] Patel JK, Glatz AC, Ghosh RM, Jones SM, Natarajan S, Ravishankar C, Mascio CE, Spray TL, Cohen MS. Intramural Ventricular Septal Defect Is a Distinct Clinical Entity Associated With Postoperative Morbidity in Children After Repair of Conotruncal Anomalies. Circulation. 2015 Oct 13;132(15):1387-1394. doi: 10.1161/CIRCULATIONAHA.115.017038.

[8] Başpınar O, Kosger P, Aydin Sahin D. Percutaneous Closure of Hemodynamically Significant Postoperative Residual Ventricular Septal Defects. Pediatr Cardiol. 2024 Feb;45(2):272-281. doi: 10.1007/s00246-023-03366-9.

[9] Walsh MA, Coleman DM, Oslizlok P, Walsh KP. Percutaneous closure of postoperative ventricular septal defects with the Amplatzer device. Catheter Cardiovasc Interv. 2006 Mar;67(3):445-451; discussion 452. doi: 10.1002/ccd.20626.

[10] Dua JS, Carminati M, Lucente M, Piazza L, Chessa M, Negura D, Bussadori C, Saliba Z, Butera G. Transcatheter closure of postsurgical residual ventricular septal defects: early and mid-term results. Catheter Cardiovasc Interv. 2010 Feb 1;75(2):246-255. doi: 10.1002/ccd.22262.