Ebstein anomaly and tricuspid valve disease

The single idea that holds the whole topic together is that Ebstein anomaly is a disease of tricuspid-valve leaflet formation: because the septal and posterior leaflets are tethered down into the right ventricle, the valve cannot close, the right atrium balloons, and everything that follows — the tricuspid regurgitation, cyanosis, arrhythmia, surgical strategy — flows from that one developmental error. Grasp the anatomy and the rest is mechanism. ^{[1] [4]}

This page covers the recognition of Ebstein anomaly from fetus to adult, the Carpentier grades and Great Ormond Street score that predict outcome, the neonatal resuscitation of the ductal-dependent severe form, the cone reconstruction and the single-ventricle Starnes pathway for the most severe cases, the arrhythmia burden, and the lifelong follow-up that no Ebstein patient ever leaves. It links to the ductal-dependent congenital heart disease and neonatal cyanosis leaves for the broader differential. ^{[2] [5]}

Overview & Definition

Ebstein anomaly is defined by the apical displacement of the functional tricuspid-valve orifice toward the right ventricular apex, produced by failed delamination of the septal and posterior leaflets during cardiac development. The anterior leaflet is usually large and sail-like but tethered, and the effective coaptation point sits far below the true fibrous annulus. The right ventricle is partitioned into a thin, atrialised inflow portion that is electrically ventricular but haemodynamically part of the atrium, and a small, often poorly contracting functional outflow portion. ^{[1] [4]}

What makes the lesion behave as it does is the combination of a regurgitant valve and a small pumping chamber. Tricuspid regurgitation floods the right atrium, which dilates enormously and may hold the rightward and inferior interventricular septum flat against the left ventricle, impairing left-sided filling. A right-to-left shunt across a patent foramen ovale or atrial septal defect is present in most patients, producing cyanosis and a risk of paradoxical embolism. When the regurgitation is severe enough that the functional right ventricle cannot generate forward flow across the pulmonary valve, the neonate has functional pulmonary atresia and depends on the ductus arteriosus for pulmonary blood flow. ^{[5] [2]}

Tricuspid-valve disease in children beyond Ebstein includes tricuspid dysplasia (regurgitant valve leaflets without displacement), tricuspid atresia (absent valve and a hypoplastic right ventricle producing ductal-dependent cyanosis), and the rarer tricuspid stenosis of Noonan syndrome, carcinoid or rheumatic disease. Ebstein anomaly is the dominant congenital tricuspid lesion, and the one a general paediatrician must recognise at the bedside. ^{[11] [7]}

References12ShowHide

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2. [2]Pasqualin G; Boccellino A; Chessa M; et al Ebstein's anomaly in children and adults: multidisciplinary insights into imaging and therapy. Heart, 2024.PMID 37487694
3. [3]Konstantinov IE; Chai P; Bacha E; et al The American Association for Thoracic Surgery (AATS) 2024 expert consensus document: Management of neonates and infants with Ebstein anomaly. J Thorac Cardiovasc Surg, 2024.PMID 38685467
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7. [7]Neumann S; Rüffer A; Sachweh J; et al Narrative review of Ebstein's anomaly beyond childhood: Imaging, surgery, and future perspectives. Cardiovasc Diagn Ther, 2021.PMID 35070800
8. [8]da Silva JP; Baumgratz JF; da Fonseca L; et al The cone reconstruction of the tricuspid valve in Ebstein's anomaly. The operation: early and midterm results. J Thorac Cardiovasc Surg, 2007.PMID 17198815
9. [9]Delhaas T; Sarvaas GJ; Rijlaarsdam ME; et al A multicenter, long-term study on arrhythmias in children with Ebstein anomaly. Pediatr Cardiol, 2010.PMID 19937010
10. [10]Yu JJ; Yun TJ; Won HS; et al Outcome of neonates with Ebstein's anomaly in the current era. Pediatr Cardiol, 2013.PMID 23494543
11. [11]Thareja SK; Frommelt MA; Lincoln J; et al A Systematic Review of Ebstein's Anomaly with Left Ventricular Noncompaction. J Cardiovasc Dev Dis, 2022.PMID 35448091
12. [12]Kumar SR; Kung G; Noh N; et al Single-Ventricle Outcomes After Neonatal Palliation of Severe Ebstein Anomaly With Modified Starnes Procedure. Circulation, 2016.PMID 27777295