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Case Report

Case Report: Favoring biventricular repair beyond the conventional boundaries with primary arterial switch operation in a young adult

[version 1; peer review: 2 approved with reservations]
PUBLISHED 17 Apr 2019
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Abstract

Transposition of great arteries (TGA) presents in neonates or in infancy. We report a case of TGA with ventricular septal defect (VSD) and pulmonary stenosis (PS) in an adult male patient of 23 years age. Arterial switch operation with VSD closure and neo-aortic valve replacement was done. The patient recovered well in the post-operative period. In adult patients, conversion from atrial to arterial switch has been widely reported, both directly and after prior pulmonary artery banding in two stages, but primary arterial switch for TGA has not been reported previously. In this patient there was a benefit of having a large VSD and severe PS.

Keywords

Grown Up Congenital Heart disease, arterial switch operation

Introduction

Transposition of great arteries (TGA) presents in neonates or in infancy1. Recently, we managed an adult patient with cyanotic congenital heart disease [TGA with sub pulmonic ventricular septal defect (VSD) with severe pulmonary stenosis (PS)] with complete biventricular repair by performing an arterial switch operation.

Case report

A 23-year-old man presented with complaints of bluish discoloration of skin and nails from childhood, associated with frequent attacks of pneumonia and dyspnea on exertion, off and on from school going age. He was deeply cyanosed and had grade 3 clubbing. Pulse oximetry showed 76% saturation in room air, not improving on oxygen supplementation. Auscultation revealed an ejection systolic murmur over the upper left sternal border, and normal heart sounds. Bilateral vesicular breath sounds were heard equally, and the abdomen was soft with no palpable organomegaly.

Echocardiography revealed ventriculoarterial discordance: aorta arising from right ventricle (RV) and pulmonary artery (PA) from left ventricle (LV); aorta found to the right and anterior to PA; evidence of severe valvular PS (gradient-83 mm Hg), with large sub-pulmonic VSD; normal biventricular function. The initial plan of management was for Rastelli procedure with valved conduit, and the patient was planned for cardiac catheterization study which suggested 92% PA saturation and 66% femoral artery saturation, PA pressure of 73/31 mm Hg and PVRI of 7.9 wood units, pulmonary flow Qp 4.3, systemic flow Qs 5.3, Qp/Qs-0.8. LV angiography suggested large S/A routable VSD, no additional VSD, and confluent PAs. Prior to surgery, an echocardiogram was repeated and the patient reassessed: VSD was found to be non-routable, with normal biventricular function. Therefore, the patient was planned for arterial switch operation (ASO) with VSD closure and pulmonary valve replacement.

Surgical correction was performed via median sternotomy, on cardiopulmonary bypass using high ascending aortic and bicaval cannulation under mild hypothermia. Cold blood cardioplegia (Delnido) with no topical cooling was used.

Peroperative findings were as follows: aorta was present anterior to and to the right of PA and arising from RV (anterior ventricle) and PA from LV (posterior ventricle); moderate sized sub pulmonic VSD; pulmonic valve was bicuspid with calcification; no atrial septal defect (ASD).

The PAs were dissected up to the lung hila after division of the ductus arteriosus. The aorta was cross-clamped, cardioplegia given to the aortic root, and the aorta transected. Coronary buttons were harvested from the aortic sinuses together with a variable amount of sinus wall using minimum dissection. The main PA was transected 3 to 4 mm below the bifurcation. Bicuspid and calcific cusps excised and valved sized and seated with 17 MM SJM Regent valve. One of the pulmonary valve cusps had a thrombus, which was completely removed. This was causing an outlet obstruction for the systemic ventricle (future LV) at the valvular level. The coronary buttons were re-implanted into the neo-aortic sinus rather than above the sino-tubular junction. Trans aortic PTFE patch VSD closure was done. Neo-aortic anastomosis was completed after LeCompte maneuver. Right atrium opened to check for ASD, with no ASD was present. Autogenous fixed pericardial patch reconstruction of the neo-pulmonary root was done. Aortic cross clamp was released, root vented and neo-pulmonary anastomosis was carried out during rewarming phase. Patient was weaned off from bypass. Aortic decannulation was done after giving protamine (single dose of 1.5mg/kg in order to neutralize Heparin given at 1mg/kg).

Postoperative recovery was uneventful in the ICU. Inotropes (Dobutamine at 10mic/kg/min slowly tapered and stopped within 24hours), antibiotics (Inj. Cefotaxime 1g twice a day for first 24hrs postoperatively) and supplements (nutrition) were followed as per unit policy. On the third postoperative day, with active mobilization, the patient had complaints of occasional dizziness and headache. Detailed ENT and neurological evaluation showed no anatomical substrate for his symptoms. His symptoms gradually subsided over a period of few days.

Discussion

The conventional age boundaries for cardiac surgery for complex cyanotic cases have been pushed previously2. We report a singular experience of a 23-year-old young adult with congenital TGA (with VSD and PS) who successfully underwent a complete repair – ASO with transaortic VSD closure with neo-aortic valve replacement.

Whereas most case reports of ASO in adults35 prior to ours have reported cases of converting and atrial switch to arterial switch operation after prior LV retraining as a two stage ASO, we report a successful primary arterial switch in this adult patient.

Massimo et al. in 20003 reported a case (Table 1) with moderate PA hypertension and preserved LV function operated for ASO. In their case, moderate pulmonary hypertension played a role in preserving some degree of LV hypertrophy. Di Donato6 reviewed the literature on ASO in older children and adults post PA banding. The longer the morphological LV works at low pulmonary pressure, the lower is the capability of inducing LV hypertrophy by PA banding. Hence the mature myocardium may have poor response to pressure overload.

Table 1. Review of cases of d-TGA with delayed transition to arterial switch.

PA, pulmonary artery.

CaseNAge at 1st operationInitial procedurePA BandArterial switch operation
Massimo et al.31InfancyMustard operation
+ ventricular septal defect closure
Yes6 months after PA banding +
at age of 23 years
Cochrane et al.42414 monthsAtrial switch (Senning/Mustard)In 15 cases12 cases: staged switch
4 cases: direct switch
De Jong526 weeks and 4 monthsBalloon atrial septostomy + MustardNoConversion to arterial switch

Our patient had good LV morphology and function due to the presence of two favorable factors – a large VSD and presence of severe PS that provided afterload to morphologic LV, which is otherwise not achieved in cases without severe PS. Thus, these two factors ensured that a primary ASO with VSD closure and neo-aortic valve replacement was adequate in this young man.

Consent

Written informed consent was obtained from the patient for the publication of the report of his case.

Data availability

All data underlying the results are available as part of the article and no additional source data are required.

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how to cite this article
Agasty S, Tsering S, Menon PR et al. Case Report: Favoring biventricular repair beyond the conventional boundaries with primary arterial switch operation in a young adult [version 1; peer review: 2 approved with reservations]. F1000Research 2019, 8:507 (https://doi.org/10.12688/f1000research.17367.1)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Open Peer Review

Current Reviewer Status: ?
Key to Reviewer Statuses VIEW
ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 1
VERSION 1
PUBLISHED 17 Apr 2019
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Reviewer Report 12 Feb 2021
Ali Hosseinsabet, Department of Cardiology, Tehran University, Enghelab, Tehran, Iran 
Approved with Reservations
VIEWS 3
  • Unfortunately the catherization and echocardiographic data presented is incomplete and without more explanations.
     
  • I expected that you present more clinical data after surgery and follow up data. In addition, echocardiography movies and pictures
... Continue reading
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CITE
HOW TO CITE THIS REPORT
Hosseinsabet A. Reviewer Report For: Case Report: Favoring biventricular repair beyond the conventional boundaries with primary arterial switch operation in a young adult [version 1; peer review: 2 approved with reservations]. F1000Research 2019, 8:507 (https://doi.org/10.5256/f1000research.18992.r79357)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Views
5
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Reviewer Report 04 May 2020
Marc M. Anders, Pediatric Critical Care Medicine, Baylor College of Medicine (BCM), Houston, TX, USA 
Approved with Reservations
VIEWS 5
  • The author should expand on the preop cath findings, the degree and location of the ps. pulsoximetry findings in the context of the pda - as noted later. 
     
  • The perioperative monitoring especially
... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Anders MM. Reviewer Report For: Case Report: Favoring biventricular repair beyond the conventional boundaries with primary arterial switch operation in a young adult [version 1; peer review: 2 approved with reservations]. F1000Research 2019, 8:507 (https://doi.org/10.5256/f1000research.18992.r47423)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.

Comments on this article Comments (0)

Version 1
VERSION 1 PUBLISHED 17 Apr 2019
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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