title: [Postpartum change of blood pressure and its risk factors in patients with hypertensive disorders in pregnancy].
abstract: OBJECTIVE
  To investigate the change of blood pressure in patients with hypertensive disorders in pregnancy after delivery and the risk factors.
  
  
  METHODS
  In a retrospective cohort study, we collected subjects from villages and towns in Liuyang by cluster sampling method. Before enrolling in this cohort, all had established health records from January 2010 to December 2011. We collected the medical records and maternal health care manuals of this cohort as our data materials, focusing on the blood pressure records as well as related features. We compared the differences of recovery rate of postpartum blood pressure in different kinds of antenatal blood pressure groups with χ2 test. In order to explore the main factors influencing the recovery rate of blood pressure of patients with hypertensive disorders in pregnancy, we conducted univariate and multivariate analysis by χ2 test and unconditional logistic regression analysis.
  
  
  RESULTS
  Among the 460 women with hypertensive disorders in pregnancy in our analysis, the recovery rate of postpartum blood pressure reached 88.7%. Multivariate analysis showed that the risk factors influencing the recovery rate of postpartum blood pressure included advanced age (OR=0.436), higher degree of hypertensive disorders in pregnancy (OR=0.436), and hypertension with simultaneously high systolic and diastolic blood pressures (OR=0.192).
  
  
  CONCLUSIONS
  For most patients with hypertensive disorders in pregnancy, the blood pressure may decrease to normal level 42 days after delivery. Women with advanced age, higher degree of hypertensive disorders in pregnancy and hypertension with simultaneously high systolic and diastolic blood pressures should be given more attention.
authors.affiliation: Department of Epidemiology and Health Statistics, School of Pubic Health, Central South University, Changsha 410078,China.
authors.forename: Lin
authors.initials: L
authors.lastname: Shen
authors.forename: Hongzhuan
authors.initials: H
authors.lastname: Tan
authors.forename: Shujin
authors.initials: S
authors.lastname: Zhou
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Yue
authors.initials: Y
authors.lastname: He
authors.forename: Li
authors.initials: L
authors.lastname: Hu
authors.forename: Meiling
authors.initials: M
authors.lastname: Luo
authors.forename: Shaya
authors.initials: S
authors.lastname: Wang
authors.forename: Yawei
authors.initials: Y
authors.lastname: Guo
authors.forename: Chang
authors.initials: C
authors.lastname: Cai
mesh_terms: D001794:Blood Pressure; D003971:Diastole; D005260:Female; D006801:Humans; D046110:Hypertension, Pregnancy-Induced / Q000453:epidemiology / Q000503:physiopathology*; D049590:Postpartum Period; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors; D013599:Systole