Abstract
Cardiac output(CO) can be assessed noninvasively by range-gated pulsed Doppler echocardiography. Simultaneous two-dimensional echocardiography from the apical window allows control of position of the sample volume. To evaluate the accuracy of this method (which is well established in adults) in the neonate, ten healthy newborn infants with gestational ages of 32-36 wks and birth weights of 1670 - 2730 g were studied at postnatal ages of 2 - 10 days.
A 5 MHz mechanical transducer in the Duplex-mode (2D and M-mode/2D and pulsed Doppler) was used. The aortic cross-sectional area was calculated from the aortic root diameter measured by M-mode. Velocity of the left ventricular outflow tract was measured from the apical five-chamber-view. Stroke volume was calculated by the integral of the maximum velocity curve from spectral display obtained by discrete Fourier transformation.
Stroke volume values ranged from 2.3 ml to 6.3 ml (median 4.7 ml). CO corrected for body weight ranged from 199.7 ml/min/kg to 381.4 ml/min/kg (median 283.1 ml/min/kg). Cardiac output was higher in infants delivered vaginally than in those delivered by cesarean section (median 309.1 ml/min/kg vs. 267.0 ml/min/kg).
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Isken, V., Leonhardt, A. & Linderkamp, O. 123: PULSED DOPPLER ECHOCARDIOGRAPHIC DETERMINATION OF NEONATAL CARDIAC OUTPUT USING THE APICAL WINDOW. Pediatr Res 24, 281 (1988). https://doi.org/10.1203/00006450-198808000-00148
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DOI: https://doi.org/10.1203/00006450-198808000-00148