Abstract
Cardiac output can be estimated with Doppler ultrasonography by measuring aortic root diameter and aortic blood velocity: Q (ml/min) = V × A × 60 (sec/min). Q=aortic blood flow, V=mean aortic velocity, and A=aortic cross sectional area. We evaluated the ability of a Diasonics duplex ultrasound scanner to estimate cardiac output in newborn piglets. Aortic diameter and mean peak aortic blood velocity were measured while simultaneously measuring cardiac output with the microsphere technique in six newborn piglets. Comparison of the 16 cardiac output measurements obtained with each technique demonstrated a correlation coefficient of .68. Duplex ultrasonography reliably estimated cardiac output in newborn piglets by measuring aortic diameter and mean peak blood flow velocity (p<0.05). However, in our hands, the correlation between these two techniques showed considerable scatter. Further studies to investigate the etiology of these deviations are necessary before utilizing Doppler derived cardiac outputs in the research or clinical setting.
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Malone, T., Hansen, N., Bashiru, M. et al. 118 CORRELATION BETWEEN CARDIAC OUTPUT MEASURED BY THE MICROSPHERE METHOD AND DUPLEX DOPPLER ULTRASONOGRAPHY. Pediatr Res 19, 130 (1985). https://doi.org/10.1203/00006450-198504000-00148
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DOI: https://doi.org/10.1203/00006450-198504000-00148