title: ["Straddling" tricuspid valve across an isolated ventricular septal defect. Apropos of 4 cases].
abstract: Four cases of children from 10 months to 3 years of age with isolated ventricular septal defects and straddling tricuspid valve are reported. Three patients underwent surgery (mean age: 24 months). The lesion was diagnosed during operation in 2 cases. The VSD was a perimembranous defect with extension to the ventricular inlet in 2 cases, and in the other it was entirely muscular. The straddling involved all the septal leaflet of the tricuspid valve in 1 case. In two cases, there was doubling of the segment with one part crossing the VSD. The left ventricular attachment was a type B in 2 patients and type C in 1 patient. The tricuspid ring was normally situated in all patients (no overriding). In 2 patients, the diagnosis was made with the aid of complementary investigations, and, in particular, 2D echocardiography. One of these patients has not yet undergone surgery as the lesion is well tolerated and because of associated mitral regurgitation. In 3 patients, surgery consisted of repairing the ventricular septal defect, leaving the abnormal part of the tricuspid valve in the left ventricle. All patients survived; there were no cases of post-operative atrioventricular block or signs of tricuspid incompetence. With reference to these three cases, the authors review the main anatomical lesions, the diagnostic signs and different methods of treatment of this condition. Straddling tricuspid valve may present as a simple ventricular septal defect. This diagnosis should be considered in all cases of posterior ventricular septal defects.
mesh_terms: D000792:Angiography; D002675:Child, Preschool; D004452:Echocardiography; D005260:Female; D006345:Heart Septal Defects, Ventricular / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D007223:Infant; D014261:Tricuspid Valve / Q000002:abnormalities* / Q000601:surgery
vernacular_title: "Straddling" de la valve tricuspide à travers une communication interventriculaire isolée. A propos de 4 cas.