Objective: To characterize the velocity profiles (VP), relative wall distension rate (WDR) and wall shear rate (WSR) of the FUA in the 1st, 2nd and 3rd trimesters of normal pregnancies. Methods: The MSDA system consisted of commercial ultrasound machine (Aloka SSD1400), a personal computer and a proprietary electronic board working with GASP software. Interrogated vessels consisted of the FUA in a total of 36 singleton uncomplicated ongoing pregnancies. Velocity profiles, relative wall distension rate [WDR (%)] and shear rate [WSR (1/s)] were calculated over multiple consecutives cardiac cycles in real‐time. The designation of arterial pseudo‐laminar flow was applied if one peak occurred in systole, while if > 1 peak in systole was classified as turbulent. Statistical analysis consisted of Spearman correlation. Results: FUA displayed a laminar flow pattern throughout gestation in all 36 cases. Mean WDR[%] was not correlated with gestational age and fetal growth. Mean WSR (476 ±217) remained constant throughout gestation, beginning at 7 wks. Conclusion: Real time velocity profile analysis of the FUA is now possible using MSDA and GASP software. In apparently normal pregnancies, velocity characteristics are remarkably stable throughout gestation. We suspect that one practical use of this new technology is that it will ensure complete insonation of the umbilical vessel, particularly at early gestational ages when vessel diameter is quite small. If laminar flow is not encountered, it would be because either the vessel was not insonated optimally, or indeed that a pathology exists. This study suggest that the size of the umbilical arteries adapts to flow demands and maintains constant mean wall shear rate.

P13.20: Real time velocity profile of fetal umbilical arteries (FUA) by global acquisition and signal processing (GASP) software for multigate spectral Doppler analysis (MSDA) / Urban, G.; Ricci, S.; Copel, J. A.; Guidi, F.; Sanguineti, F.; Patrizio, P.; Tortoli, P.; Paidas, M.. - In: ULTRASOUND IN OBSTETRICS & GYNECOLOGY. - ISSN 0960-7692. - ELETTRONICO. - 28:(2006), pp. 593-593. (Intervento presentato al convegno 16th World Congress on Ultrasound in Obstetrics and Gynecology) [10.1002/uog.3704].

P13.20: Real time velocity profile of fetal umbilical arteries (FUA) by global acquisition and signal processing (GASP) software for multigate spectral Doppler analysis (MSDA)

Ricci, S.;Guidi, F.;Tortoli, P.;
2006

Abstract

Objective: To characterize the velocity profiles (VP), relative wall distension rate (WDR) and wall shear rate (WSR) of the FUA in the 1st, 2nd and 3rd trimesters of normal pregnancies. Methods: The MSDA system consisted of commercial ultrasound machine (Aloka SSD1400), a personal computer and a proprietary electronic board working with GASP software. Interrogated vessels consisted of the FUA in a total of 36 singleton uncomplicated ongoing pregnancies. Velocity profiles, relative wall distension rate [WDR (%)] and shear rate [WSR (1/s)] were calculated over multiple consecutives cardiac cycles in real‐time. The designation of arterial pseudo‐laminar flow was applied if one peak occurred in systole, while if > 1 peak in systole was classified as turbulent. Statistical analysis consisted of Spearman correlation. Results: FUA displayed a laminar flow pattern throughout gestation in all 36 cases. Mean WDR[%] was not correlated with gestational age and fetal growth. Mean WSR (476 ±217) remained constant throughout gestation, beginning at 7 wks. Conclusion: Real time velocity profile analysis of the FUA is now possible using MSDA and GASP software. In apparently normal pregnancies, velocity characteristics are remarkably stable throughout gestation. We suspect that one practical use of this new technology is that it will ensure complete insonation of the umbilical vessel, particularly at early gestational ages when vessel diameter is quite small. If laminar flow is not encountered, it would be because either the vessel was not insonated optimally, or indeed that a pathology exists. This study suggest that the size of the umbilical arteries adapts to flow demands and maintains constant mean wall shear rate.
2006
16th World Congress on Ultrasound in Obstetrics and Gynecology
16th World Congress on Ultrasound in Obstetrics and Gynecology
Goal 9: Industry, Innovation, and Infrastructure
Urban, G.; Ricci, S.; Copel, J. A.; Guidi, F.; Sanguineti, F.; Patrizio, P.; Tortoli, P.; Paidas, M.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1216905
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