caa a22 4500 378938118 CHVBK 20180305123645.0 cr unu---uuuuu 161128e20040709xx s 000 0 eng 10.1515/JPM.2004.061 doi (NATIONALLICENCE)gruyter-10.1515/JPM.2004.061 Changes in the size of maternal inferior vena cava during pregnancy [Elektronische Daten] [E. Ryo, N. Unno, T. Nagasaka, Y. Taketani] Aims: To investigate the changes in the size of maternal inferior vena cava (IVC) during normal pregnancy. Methods: The diameter and the area of IVC were measured in 32 non-pregnant and 214 pregnant women by ultrasonography. They were measured not only in the supine but also in the complete left lateral position when gestation was over 16 weeks. Results: IVC in the 4-7 weeks pregnant group was larger than that in the non-pregnant group, and it decreased as gestation progressed during an early stage of pregnancy. After 16 weeks gestation, it demonstrated no change, at least for depending on the periods when the mother was in the supine position. On the contrary, they increased with the gestational progress as for the maternal left lateral position. Conclusions: The size of IVC at an early stage of pregnancy is enlarged, suggesting an underfilling state of arterial circulation. In the second and third trimesters, it is stationary when the mother is supine. In the left lateral position, it increases as the gestation progresses, reflecting blood volume expansion during pregnancy. Copyright © 2004 by Walter de Gruyter GmbH & Co. KG Human reproduction, growth & development nationallicence Gynaecology & obstetrics nationallicence Paediatric medicine nationallicence Ryo E. aut Unno N. aut Nagasaka T. aut Taketani Y. aut Journal of Perinatal Medicine Walter de Gruyter 32/4(2004-07-09), 327-331 0300-5577 32:4<327 2004 32 jpme https://doi.org/10.1515/JPM.2004.061 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/JPM.2004.061 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ryo E. aut NATIONALLICENCE 700 1- Unno N. aut NATIONALLICENCE 700 1- Nagasaka T. aut NATIONALLICENCE 700 1- Taketani Y. aut NATIONALLICENCE 773 0- Journal of Perinatal Medicine Walter de Gruyter 32/4(2004-07-09), 327-331 0300-5577 32:4<327 2004 32 jpme CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter