Severe Systemic Atrioventricular Valve Regurgitation in Congenitally Corrected Transposition

Honestly: it may relieve congestion and slow decline, but it will not restore a normal heart, and the window for a good result is narrow.

The pathophysiology is a self-reinforcing loop: regurgitation dilates the systemic right ventricle, dilatation distorts the annulus and tethers the leaflets, and the resulting regurgitation further overloads a ventricle that already faces systemic afterload. At an ejection fraction of 33% with NYHA III symptoms and two admissions, she is near the far side of the useful window - perioperative risk is elevated and durability of repair is uncertain.

The critical determinant is mechanism. If regurgitation is primarily annular dilatation, annuloplasty may help; if leaflets are dysplastic (Ebstein-like, common in this lesion) or tethered by a dilated ventricle, a simple ring will fail early and replacement is more realistic. Replacement in the systemic position carries its own penalty: mechanical prostheses require anticoagulation with genuine thrombotic risk in a low-flow, dilated ventricle, while bioprostheses degenerate faster in a young patient.

Frame the conversation around three outcomes - symptom relief, years gained before transplant, and the real possibility that transplantation is the eventual endpoint - rather than around a single operation.

Work-up:

• Transoesophageal echocardiography to define leaflet morphology, tethering and annular size - this drives repair versus replacement.
• Right heart catheterization: pulmonary artery pressures, pulmonary vascular resistance, and coronary anatomy. Anomalous coronary origins are common in {S,L,L} and matter enormously at reoperation.
• Assessment of hepatic and renal function and of venous congestion (cardiac cirrhosis changes the operation to combined heart–liver).
• Electrophysiology review: nonsustained ventricular tachycardia with an ejection fraction of 33% raises the question of a defibrillator, though transvenous access to a systemic right ventricle is often impossible and epicardial or subcutaneous systems must be considered.
• Frailty, prior sternotomy and frailty of the right ventricle under anaesthesia.

Findings favouring transplant assessment: ejection fraction below 30% with refractory NYHA III–IV symptoms, regurgitation not amenable to durable repair, irreversible pulmonary vascular disease, established cardiac cirrhosis, or an unacceptably high reoperative risk. Involve the transplant team early rather than after a failed repair - a candidacy assessment takes weeks and is not a failure of optimism.

First, exclude the reversible. Echocardiography for paravalvular leak, prosthesis dysfunction or a new ventricular septal defect; evaluate for pericardial constriction; check for anaemia, thyroid disease and drug issues; confirm the rhythm is not persistent atrial arrhythmia with loss of atrial contribution.

Conduction injury is expected in this anatomy: the atrioventricular node is displaced anteriorly and is at genuine risk at reoperation. A new left bundle branch block in a systemic right ventricle causes mechanical dyssynchrony the ventricle tolerates poorly.

Resynchronization is anatomically difficult here. The coronary sinus drains to the systemic atrium and runs along the morphologic left ventricle, which is the subpulmonary ventricle in {S,L,L}; transvenous access to the systemic ventricle is usually not achievable. Epicardial leads placed surgically, or a hybrid approach, are the realistic options, and evidence in this population is thin - offer it as a considered attempt, not a guaranteed fix.

Simultaneously: optimize heart failure therapy, treat any arrhythmia, and refer for transplant assessment now. A ventricle that has not recovered at three months after correction of the loading condition is unlikely to do so, and the conversation should shift from valve-centric thinking to advanced failure planning.