New insight into left ventricular function in tricuspid atresia after total cavopulmonary connection: a three-dimensional echocardiographic study.

Abstract:

BACKGROUND:In patients with tricuspid atresia palliated by construction of a total cavopulmonary connection, both pulmonary and systemic circulations depend on the performance of the dominant left ventricle. When estimating the volume of such ventricles using cross-sectional echocardiography, it is necessary to make assumptions concerning the geometry of the ventricular shape. This is avoided by three-dimensional echocardiography, which provides direct volumetric data. Our purpose was to apply this new method to quantify left ventricular volumes and function in patients with tricuspid atresia after construction of a total cavopulmonary connection. METHODS:We studied ten patients (median age: 8 years) with tricuspid atresia who had undergone a total cavopulmonary connection, comparing them with 10 normal children matched for age, sex and size. The three-dimensional echocardiography was performed with electrocardiographic and respiratory gating. A new transthoracic integrated probe designed for small children was used with a rotational scanning increment of 3 degrees. The 60 slices obtained from the ventricular cavity were stored and formatted in a commercial system (TomTec). End-diastolic and end-systolic volumes, stroke volume and ejection fraction were calculated after manual tracing of the endocardial surfaces. The volumes were indexed to the body surface area. RESULTS:As seen in the reconstructions, the dominant left ventricle in tricuspid atresia had a spherical shape, whereas the normal left ventricle is oblong. The left ventricular volumes and function in tricuspid atresia were 54+/-4 ml/m2 (end-diastolic volume), 28+/-3 ml/m2 (end-systolic volume), 26+/-7 ml/m2 (stroke volume) and 48+/-6% (ejection fraction). These volumes were not different from those obtained in the controls (p = NS). The left ventricular stroke volume and ejection fraction in 10 patients with tricuspid atresia were lower than those calculated for the controls (p < 0.05). CONCLUSIONS:Three-dimensional echocardiography provides a quantitative insight into the pathophysiologic function of the dominant left ventricle in tricuspid atresia after construction of a total cavopulmonary connection.

journal_name

Cardiol Young

journal_title

Cardiology in the young

authors

Acar P,Saliba Z,Sidi D,Kachaner J

doi

10.1017/s1047951100006521

keywords:

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

83-9

issue

2

eissn

1047-9511

issn

1467-1107

journal_volume

10

pub_type

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