title: Discontinuation of antihypertensive drug use during the first trimester of pregnancy and the risk of preeclampsia and eclampsia among women with chronic hypertension.
abstract: OBJECTIVE
  The goal of this study was to investigate the association between the discontinuation of antihypertensive medication use during the first trimester of pregnancy and the risk of preeclampsia and eclampsia.
  
  
  METHODS
  We conducted a nested case-control approach within a cohort that was reconstructed from the linkage of 3 databases. To be included in the study, women had to match the following criteria: (1) between 15-45 years old on the first day of gestation, (2) covered by Québec's Drug Insurance Plan for at least 12 months before and during pregnancy, (3) exposed to an antihypertensive drug on the first day of gestation, and (4) have had a delivery. Multivariate conditional logistic regression models were used to estimate the risk.
  
  
  RESULTS
  Adjusting for confounders, the odds ratio was 0.66; 95% confidence interval, 0.27-1.56.
  
  
  CONCLUSIONS
  Our finding does not support the presence of a statistically significant association between antihypertensive discontinuation during the first trimester of pregnancy and the risk of preeclampsia and eclampsia.
authors: University of Montreal, Montreal, Québec, Canada.
authors: Hamid Reza
authors: HR
authors: Nakhai-Pour
authors: Evelyne
authors: E
authors: Rey
authors: Anick
authors: A
authors: Bérard
mesh_terms: D000328:Adult; D000959:Antihypertensive Agents / Q000627:therapeutic use*; D016022:Case-Control Studies; D002908:Chronic Disease; D004461:Eclampsia / Q000453:epidemiology*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000188:drug therapy* / Q000453:epidemiology*; D016015:Logistic Models; D011225:Pre-Eclampsia / Q000453:epidemiology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012307:Risk Factors; D013375:Substance Withdrawal Syndrome / Q000453:epidemiology
chemical_list: D000959:Antihypertensive Agents