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- W2000901280 abstract "Gated pulsed Doppler echocardiography (GPDE) allows non-invasive examination of cardiac index. Regional systolic blood flow (RSBF), however, is a more relevent parameter in many congenital cardiovascular anomalies. This study examined the central aortic systolic waveform in normal neonates to establish indices of regional systemic systolic blood flow in the ascending and descending aorta. Combined subxyphoid two dimensional and GPDE were performed in the ascending and desending aorta of twenty normal neonates, 68+/−13 hours of age. The peak systolic frequency (PSF), frequency time intergral (FTI), cycle length and ejection time were measured and corrected, when indicated, for incident echo beam angle. The calculated RSBF in the ascending aorta was 4.04 (+/−11%) liters per minute per meter squared (L/min/m2) and 2.58 L/min/m2 (+/−25%) in the descending supraceliac thoracico-abdominal aorta. These values were comparable to the historical normal values of 2.8-4.6 and 2.1-3.5 liters/min/meter 2, respectively. A linear relationship, independent of cycle length, existed between the FTI and the corrected peak frequency. The FTI represents a rate independent ejection phase index of effective stroke volume. Noninvasive quantitation of ascending and thoracico-abdominal descending aortic blood flow should be a useful adjunt in evaluating cardiovascular anomalies of the neonate and therapuetic interventions for their management." @default.
- W2000901280 created "2016-06-24" @default.
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- W2000901280 date "1984-04-01" @default.
- W2000901280 modified "2023-10-18" @default.
- W2000901280 title "DOPPLER FLOW INDICES IN THE CENTRAL AORTA OF NEONATES" @default.
- W2000901280 doi "https://doi.org/10.1203/00006450-198404001-00172" @default.
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