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Acquired ventricular septal defect following surgery for aortic valve endocarditis
  1. Labib Syed1,
  2. Alex Shipolini2,
  3. Habib Syed3 and
  4. Mohammed Y Khanji2
  1. 1Princess Alexandra Hospital NHS Trust, Harlow, Essex, UK
  2. 2Cardiology, Barts Health NHS Trust, London, UK
  3. 3Brighton and Sussex Medical School, Brighton, UK
  1. Correspondence to Mr Labib Syed; Labib.syed8{at}gmail.com

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Description

A 52-year-old Caucasian man presented with a 3-week history of productive cough, diaphoresis, fever, malaise and pleuritic chest pain. On examination he was tachycardic (heart rate 130 beats/min) and normotensive (131/59 mmHg) with quiet heart sounds and no audible murmurs. Chest radiography showed bilateral pulmonary consolidation and arterial blood gas revealed type 1 respiratory failure requiring intubation and mechanical ventilation. Subsequently, the patient had two failed extubations and following this was transferred to a specialised cardiac centre. Initial transthoracic echocardiogram (TTE) revealed mild-to-moderate aortic regurgitation (AR) with no obvious vegetations. Blood cultures grew Streptococcus oralis sensitive to penicillin, despite not having any history of dental problems or interventions. Repeat TTE 8 days later demonstrated severe eccentric AR with a large 1.3 cm vegetation on the aortic valve, which is a 1A indication for surgery. Subsequent transoesophageal echocardiogram (TOE) confirmed these findings as well as excluding an aortic root abscess (figure 1A, video 1). He was treated for infective endocarditis (IE) with intravenous benzylpenicillin and gentamycin.

Figure 1

(A) Transoesophageal echocardiogram (TOE) indicating aortic valve vegetation (red arrow) causing severe anteriorly directed aortic regurgitation. (B) Postoperative transthoracic echocardiogram short axis view at the level of the aortic valve, showing a turbulent left-to-right systolic flow across the ventricular membranous septum. Also, seen in a modified four-chamber view (with and without colour flow (C) and (D), respectively) and in postoperative TOE (E) with a high velocity across the ventricular septal defect on continuous wave Doppler assessment (F) suggesting a small-sized shunt.

Video 1.

He underwent emergency tissue aortic valve replacement (AVR) with a 23 mm Perimount Magna Ease with a successful outcome. However, 2 weeks postoperatively a loud pansystolic murmur was heard all over the precordium. Repeat TTE showed a turbulent systolic flow across the ventricular membranous septum with a left-to-right shunt, with Qp/Qs ratio of 1.2, consistent with a small restrictive membranous ventricular septal defect (VSD) (figure 1B–D and videos 2 and 3). Postoperative TOE confirmed the VSD with a peak velocity of 4.54 m/s and gradient of 83 mmHg (figure 1E,F and video 4). The endocarditis multidisciplinary team decision was to treat conservatively. He remained well at 10-month follow-up with no progression of the VSD on repeat echocardiography.

Video 2.
Video 3.
Video 4.

Acquired restrictive VSDs following AVR is a rare but recognised complication. The pathophysiology is unknown but is most likely a consequence of a mechanical tear in an area where the tissues are thin, and combined with the presence of left ventricular hypertrophy, causing additional stress on the sutures used to attach the valve. The conventional treatment for this complication is the use of an Amplatzer device via a percutaneous route. However, the indication for treatment depends on haemodynamic parameters assessing right ventricular strain and dilation, with a rise in pulmonary arterial pressure or the presence of significant anaemia due to haemolysis from the high velocity jet. The patient did not exhibit these complications from the VSD therefore, it was agreed not to repair the defect presently following review by the structural interventional cardiology team.

Learning points

  • The restrictive ventricular septal defect (VSD) was an incidental finding 2 weeks following aortic valve replacement (AVR). This highlights the importance of clinical examination and a postoperative echocardiogram roughly 6 weeks after AVR to exclude such complications.

  • Management of a restrictive VSD post AVR should be determined on assessment of haemodynamic parameters and the presence of haemolysis or anaemia.

  • Optimal suturing can be challenging in tissue areas of thin composition in association with left ventricular hypertrophy, particularly if surrounding tissue is friable.

Footnotes

  • Contributors LS, HS, MK and AS contributed in writing the manuscript. LS and MK obtained the images and videos. LS combined the images and videos into appropriate format.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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