[Transesophageal echo-Doppler in children: the importance of the exact measurement of the aortic diameter and its variations over time for estimating the aortic output].
The purpose of the study was to evaluate a new non invasive system of hemodynamic monitoring. The aortic systolic, diastolic and mean diameter have been measured with eco-TM and the aortic blood flow with pulsed Doppler, in order to obtain the aortic output. The aortic systolic diameter and the derived aortic output were then compared to the corresponding values obtained with CT. Ten healthy children were asked to be explored with CT under general anaesthesia and an oesophageal probe was positioned. The mean aortic diameter value was 7.18 +/- 0.91 mm. The systolic and diastolic aortic diameter was 7.87 +/- 0.91 mm and 6.65 +/- 1 mm respectively. The aortic systolic diameter measured with CT was 8.2 +/- 0.92 mm. Correlation analysis with aortic systolic diameter with eco TM as the dependent variable and aortic systolic diameter with CT as the independent variable revealed a highly significant correlation (r = 0.95, coefficient of determination 0.90). The mean percentage difference between systolic and diastolic diameter measured with TM eco scan was 15% with maximum variation 22% and minimum of 10% (p less than 0.003). The aortic blood flow calculated from the systolic aortic diameter was 29% higher than that obtained from diastolic aortic diameter. This would suggest that the correct measurement of the aortic diameter has to be considered in the final evaluation of aortic output especially in children in whom the elasticity of the aortic wall represents a major factor in determining fluctuations of aortic diameter.
Muchada
R
R
Clinique Mutualiste E. André, Lyon, France.
Rinaldi
A
A
Lavandier
B
B
Cathignol
D
D
D001011:Aorta / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000502:physiology*; D002675:Child, Preschool; D003971:Diastole; D015150:Echocardiography, Doppler / Q000379:methods; D004947:Esophagus; D006801:Humans; D007223:Infant; D013599:Systole; D013997:Time Factors
Eco-Doppler transesofageo nel bambino: importanza dell'esatta misura del diametro aortico e delle sue variazioni nel tempo per il calcolo della gettata aortica.