Anatomical considerations suggest the supraventricular crest (SC) is important for right ventricular free-wall to septum (RV FW-S) inward motion and may importantly influence overall (RV) function. The of approximation FW-S on RV function, implicitly importance SC, be judged from patients with repaired tetralogy Fallot (rToF), where components this muscular bridge are separated. functional para...

Endocardial cushion defects are complex mal-formations with a wide clinical spectrum. The abnormalities range from a small defect of the atrial septum in the position of the ostium primum, with an abnormal cleft mitral valve, to more extensive abnormalities which include tricuspid incompetence and defects of the ventricular septum. In the most severe form a common atrioventricular canal occurs....

Background. Neonates with pulmonary atresia and intact ventricular septum (PA-IVS) are frequently born with hypoplastic right heart structures that must grow after right ventricular decompression (RVD) procedures for a complete two-ventricle physiology to be achieved. Previous authors have asserted that neonatal right heart size or morphology will predict right heart growth potential. Since 198...

OBJECTIVE To quantify ventricular resynchronisation by biventricular pacing using colour tissue Doppler velocity imaging (c-TVI). DESIGN AND PATIENTS c-TVI shows regional tissue velocity profiles with a very high time resolution (10 ms). Eighteen patients were studied from an apical four chamber view at baseline and after a one month follow up of biventricular pacing. Regional left ventricula...

Background. Radiofrequency energy has been used safely and successfully to eliminate accessory pathways in patients with the Wolff-Parkinson-White syndrome and the substrate for atrioventricular nodal reentrant tachycardia. However, this form of ablation has had only limited success in eliminating ventricular tachycardia in patients with structural heart disease. In contrast, direct-current cat...

Echocardiography was used to evaluate the incidence, flow dynamics and morphological characteristics of right ventricular obstruction in 91 patients with hypertrophic cardiomyopathy. Color flow mapping was used to define the sites of obstruction in the left and right ventricles. Ventricular obstruction was considered to be present if the flow velocity was less than 2.0 m/s as measured by contin...

We investigated how pacing from different endocardial sites affects the left ventricular three-dimensional contraction pattern and performance in intact anesthetized dogs. We used data from the motion of radiopaque markers implanted in the left ventricular endocardium in an analysis based on the polar decomposition theorem to determine the left ventricle's three-dimensional principal directions...