Department of Radiology, Faculty of Medicine, Firat University, Elazig, Turkey.
Med Sci Monit. 2009 Dec;15(12):CR624-7.
Although the flow velocities of portal veins (PV) and flow patterns of hepatic veins (HV) during pregnancy were evaluated in the literature, changes in PV flow pattern during pregnancy have not been assessed. The aim of this study was to detect changes in HV and PV flow velocities and patterns during pregnancy.
MATERIAL/METHODS: One hundred sixty-three healthy pregnant women aged 17-42 years-old (mean: 26.9+/-5.1) were included in the study. Twenty-seven were in the first trimester (group 1), 89 in the second trimester (group 2), and 47 in the third trimester (group 3). Maximum and minimum flow velocities and waveforms were obtained from the hepatic vein (HV) and the main portal vein (PV) of the subjects. The flow patterns were recorded as monophasic, biphasic, and triphasic waveforms.
Maximum flow velocity of PV was higher in group 1 than in groups 2 and 3 (p<0.05). Although some subjects had a monophasic flow pattern of the PV, a biphasic flow pattern was prominent in all groups. A triphasic PV waveform was not observed in any of the groups. In the HV the triphasic waveform was prominent in the first trimester and biphasic in the second and third trimesters.
When evaluating physiological changes in pregnancy, flow pattern changes of the HV and flow velocity changes of the PV may be accepted as sensitive parameters and may be indicators of physiological alterations related to pregnancy.
尽管文献中评估了门静脉（PV）的血流速度和肝静脉（HV）的血流模式，但妊娠期间 PV 血流模式的变化尚未得到评估。本研究旨在检测妊娠期间 HV 和 PV 血流速度和模式的变化。
材料/方法：本研究纳入了 163 名年龄在 17-42 岁（平均：26.9+/-5.1）的健康孕妇。27 名处于孕早期（第 1 组），89 名处于孕中期（第 2 组），47 名处于孕晚期（第 3 组）。从受试者的肝静脉（HV）和主门静脉（PV）获得最大和最小血流速度和波形。将血流模式记录为单相、双相和三相波形。
第 1 组的 PV 最大血流速度高于第 2 组和第 3 组（p<0.05）。尽管一些受试者的 PV 血流模式为单相，但所有组均以双相血流模式为主。任何组均未观察到三相 PV 波形。在 HV 中，三相波形在孕早期明显，而在孕中期和孕晚期为双相。
在评估妊娠期间的生理变化时，HV 的血流模式变化和 PV 的血流速度变化可被视为敏感参数，并可作为与妊娠相关的生理变化的指标。
