Use of Doppler echocardiography for determining cardiac output has been widely investigated and validated. 1–6 Validation of this technique in children with congenital heart disease is limited, 3,4,7 and some problems, such as obtaining adequate Doppler samples and choice of sample sites, are of concern. This study was undertaken to validate the technique against indocyanine green dye curves in children with structural heart disease during cardiac catheterization or after surgical repair with particular reference to the optimal site for assessing aortic cross-sectional area for the calculation of cardiac output.
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