title: [Maternal and perinatal prognosis of pregnancy with chronic hypertension and analysis of associated factors].
abstract: OBJECTIVE
  To analyze the pregnant outcome of women with chronic hypertension, and to investigate the high risk factors associated with harmful maternal and perinatal prognosis.
  
  
  METHODS
  Of the 14 127 deliveries in Peking University First Hospital from Jan 2001 to Dec 2005, 121 pregnant women with chronic hypertension were identified and divided into two groups: chronic hypertension with and without preeclampsia (group PE, 64 cases; group N-PE, 57 cases). The maternal and perinatal outcomes of the two groups and the high risk factors for adverse maternal and perinatal prognosis were analyzed.
  
  
  RESULTS
  (1) The incidence of pregnancy with chronic hypertension was 0.86% (121/14 127). (2) The incidences of placental abruption, pulmonary edema and retinopathy in groups PE and N-PE were 16% (10/64) vs 2% (1/57), 11% (7/64) vs 0 and 41% (26/64) vs 16% (9/57, P < 0.05). (3) Preterm birth rate and preterm birth rate before 32 weeks in groups PE and N-PE were 55% (35/64) vs 16% (9/57) and 27% (17/64) vs 2% (1/57, P < 0.01). (4) The rate of small for gestational age in groups PE and N-PE was 31% (20/64) vs 7% (4/57, P < 0.01). (5) The perinatal mortality and newborn intensive care unit (NICU) admission rate in groups PE and N-PE were 11% (7/64) vs 0 and 33% (21/64) vs 5% (3/57, P < 0.01). (6) Chronic hypertension history > or = 4 years, no systemic therapy, irregular perinatal care and preeclampsia history were high risk factors of preeclampsia superimposed on chronic hypertension (P < 0.05). Chronic hypertension history > or = 4 years was the only independent risk factor by multiple factors logistic regression analysis (P < 0.05).
  
  
  CONCLUSIONS
  Maternal and perinatal morbidity and mortality are higher in chronic hypertension with preeclampsia than without preeclampsia. Hypertension history for at least 4 years is an independent risk factor.
authors.affiliation: Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Sun
authors.forename: You-lin
authors.initials: YL
authors.lastname: Yang
authors.forename: Hui-xia
authors.initials: HX
authors.lastname: Yang
mesh_terms: D000037:Abruptio Placentae / Q000453:epidemiology / Q000209:etiology; D000328:Adult; D002681:China / Q000453:epidemiology; D002908:Chronic Disease; D005260:Female; D005317:Fetal Growth Retardation / Q000453:epidemiology / Q000209:etiology; D005865:Gestational Age; D006801:Humans; D006973:Hypertension / Q000150:complications* / Q000453:epidemiology; D007231:Infant, Newborn; D011225:Pre-Eclampsia / Q000453:epidemiology / Q000209:etiology*; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular; D011256:Pregnancy Outcome; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors