San-Frutos Luis, Engels Virginia, Zapardiel Ignacio, Perez-Medina Tirso, Almagro-Martinez Jose, Fernandez Rafael, Bajo-Arenas Jose M
Obstetrics and Gynecology Department, Puerta de Hierro Majadahonda University Hospital, Madrid, Spain.
J Matern Fetal Neonatal Med. 2011 Nov;24(11):1333-40. doi: 10.3109/14767058.2011.556203. Epub 2011 Feb 22.
To describe hemodynamic changes in normal pregnancy and postpartum by means of thoracic electrical bioimpedance (TEB).
Eighteen healthy pregnant women were included in the study. Eight different hemodynamic variables were measured by thoracic electrical bioimpedance, from 12th week of gestation until 6th month of postpartum period. Data along pregnancy and postpartum were analyzed with SAS statistical software to compare the different values, so normality curves are reported.
Systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), and peripheral vascular resistances (PVRs) seem to significantly decrease until 24th week of gestation, and then they seem to increase until delivery, recovering normal values gradually during postpartum period. End-diastolic volume (EDV), systolic volume (SV), cardiac output (CO), and ejection fraction (EF) seem to decrease until 48 h after delivery; statistical significance was found.
Thoracic electrical bioimpedance may be the most appropriate and accurate technique to measure normal hemodynamic changes during pregnancy and postpartum.
通过胸部电阻抗（TEB）描述正常妊娠和产后的血流动力学变化。
18名健康孕妇纳入本研究。采用胸部电阻抗测量8个不同的血流动力学变量，从妊娠第12周直至产后6个月。用SAS统计软件分析妊娠和产后的数据以比较不同值，因此报告了正态曲线。
收缩压（SBP）、舒张压（DBP）、心率（HR）和外周血管阻力（PVR）在妊娠第24周前似乎显著下降，然后在分娩前似乎上升，在产后逐渐恢复正常值。舒张末期容积（EDV）、收缩期容积（SV）、心输出量（CO）和射血分数（EF）在分娩后48小时内似乎下降；发现有统计学意义。
胸部电阻抗可能是测量妊娠和产后正常血流动力学变化的最合适、最准确的技术。
