title: The natural history of white coat hypertension during pregnancy.
abstract: OBJECTIVE
  White coat hypertension (WCH) is a common phenomenon with a long term prognosis intermediate between those with true hypertension and true normotension. The natural history of this phenomenon throughout pregnancy remains unknown. We assessed the likelihood of women with an initial diagnosis of WCH developing pre-eclampsia (PE) as their pregnancy progressed.
  
  
  METHODS
  Prospective observational study.
  
  
  METHODS
  St George Hospital, a teaching and University hospital.
  
  
  METHODS
  Two hundred and forty-one pregnant women with an early pregnancy diagnosis of essential hypertension (EH).
  
  
  METHODS
  Eighty-six women had this diagnosis (EH) confirmed pre-pregnancy by 24-hour ambulatory blood pressure monitoring (ABPM) or repeated automated home blood pressure (BP) self-measurement. The remaining 155 underwent 24-hour ABPM in early pregnancy to establish their diagnosis. Women found to have WCH did not receive antihypertensives during their pregnancy, whereas those with confirmed EH received oxprenolol or methyldopa. Women with WCH had repeated 24-hour ABPM and/or BP assessments in a pregnancy day assessment unit until delivery.
  
  
  METHODS
  The development of PE in women with WCH or EH.
  
  
  RESULTS
  The overall prevalence of WCH was 32%. Half retained this phenomenon throughout pregnancy and had good pregnancy outcomes. Forty percent developed (benign) gestational hypertension and also had good pregnancy outcomes while 8% developed proteinuric PE, significantly fewer than in women with confirmed EH (22%), P= 0.008. No BP parameter at study entry permitted discrimination between those women with WCH who retained this phenomenon and those who developed GH or PE.
  
  
  CONCLUSIONS
  WCH is a common phenomenon in pregnant women who appear to have EH according to routine BP measurement early in pregnancy. Antihypertensives may be withheld from this group initially and they can be advised they will have better pregnancy outcomes than women with true EH. However, continued monitoring throughout pregnancy remains important to detect the small group of white coat hypertensives who develop PE.
authors.affiliation: Departments of Renal Medicine, Medicine, and Women's Health, University of New South Wales, St George Hospital, Gray Street, Kogarah, Sydney, NSW 2217, Australia.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Brown
authors.forename: George
authors.initials: G
authors.lastname: Mangos
authors.forename: Greg
authors.initials: G
authors.lastname: Davis
authors.forename: Caroline
authors.initials: C
authors.lastname: Homer
mesh_terms: D000328:Adult; D018660:Blood Pressure Monitoring, Ambulatory / Q000379:methods; D005260:Female; D006801:Humans; D006973:Hypertension / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D011256:Pregnancy Outcome; D015995:Prevalence; D011446:Prospective Studies