title: Hemodynamic changes during pregnancy and postpartum: a prospective study using thoracic electrical bioimpedance.
abstract: OBJECTIVE
  To describe hemodynamic changes in normal pregnancy and postpartum by means of thoracic electrical bioimpedance (TEB).
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  Thoracic electrical bioimpedance may be the most appropriate and accurate technique to measure normal hemodynamic changes during pregnancy and postpartum.
authors.affiliation: Obstetrics and Gynecology Department, Puerta de Hierro Majadahonda University Hospital, Madrid, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: San-Frutos
authors.forename: Virginia
authors.initials: V
authors.lastname: Engels
authors.forename: Ignacio
authors.initials: I
authors.lastname: Zapardiel
authors.forename: Tirso
authors.initials: T
authors.lastname: Perez-Medina
authors.forename: Jose
authors.initials: J
authors.lastname: Almagro-Martinez
authors.forename: Rafael
authors.initials: R
authors.lastname: Fernandez
authors.forename: Jose M
authors.initials: JM
authors.lastname: Bajo-Arenas
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology; D017097:Electric Impedance; D005260:Female; D005865:Gestational Age; D006339:Heart Rate / Q000502:physiology; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D049590:Postpartum Period / Q000502:physiology*; D011247:Pregnancy; D011446:Prospective Studies; D014655:Vascular Resistance / Q000502:physiology