01-7 - STROKE VOLUME IN A NORMAL PEDIATRIC POPULATION MEASURED BY REAL-TIME THREE-DIMENSIONAL ECHOCARDIOGRAPHY - 09/04/08
Decebal Gabriel LATCU,
Soizic PARANON,
Rania BASSIL-ETER,
Juliette GROSJEAN-GUITTON,
Yves DULAC,
Philippe ACAR
Voir les affiliationsObjectives: Real-time three-dimensional echocardiography (RT3DE), commercially available nowadays, allows accurate left ventricle (LV) volumetric measurements without any geometric assumption in adult patients. In pediatric patients three-dimensional LV volume measurement was validated only with an offline reconstruction technique. Our purpose is to validate this new method by measuring the stroke volume in a normal pediatric population.
Methods: Twenty-nine pediatric patients (aged one week to 16 years, median 5 years), with normal left ventricular outflow tract, no ventricular septal defect and without mitral regurgitation had a bi-dimensional echocardiography coupled with a RT3DE volumetric acquisition of the left ventricle (either X4-2 on HP 7500, X3-1 or X7-2 matrix probes on iE33, Phillips). Stroke volume was calculated by the Doppler method at the aortic annulus (SVD). End-systolic and end-diastolic volumes of the LV were measured with the semi-automated method of QLab 3DAdvanced 4.2 software (Philips). Three-dimensional stroke volume (SV3D) was calculated as their difference. Mean time for measuring SV3D was 1 minute in patients with good endocardial detection and 3 minutes when manual corrections were needed.
Results: Measurements feasibility was 86 % (impossible 3D acquisition in 2 patients due to agitation and bad quality acquisition with impossible volumetric measurements in 2 other patients). Mean SV3D was 27.9 ± 18.1 ml and mean SVD was 30.7 ± 19.6 ml. SV3D was highly correlated with SVD (r = 0.98, p < 0.0001, y = 0.90x + 0.08). Mean difference was 3.2 ± 3.4 ml. Correlation was highly significant in both subgroups of patients with good endocardial detection (12 patients) and in those needing manual correction (13 patients), but was slightly better when no endocardial contour correction was needed (r = 0.97 and 0.94 respectively).
Conclusion: RT3DE is a simple, rapid and reliable method for evaluating stroke volume in children. Hence, its use may be of particular interest in evaluating regurgitant volume in mitral insufficiency and shunt volume in ventricular septal defect.
Plan
© 2007 Elsevier Masson SAS. Tous droits réservés.
Vol 100 - N° 12
P. 1071-1072 - décembre 2007 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.