title: Retinal vein occlusion and pregnancy, pre-eclampsia, and eclampsia: the results from a nationwide, population-based study using the national claim database.
abstract: OBJECTIVE
  To investigate the incidence of retinal vein occlusion (RVO) in pregnant women and in the subpopulation of pregnant women with pre-eclampsia/eclampsia compared to that in the age-matched general female population to determine if there is increased risk of RVO in pregnancy.
  
  
  METHODS
  Nationwide population-based retrospective study using data entered into the Korean national health claims database from 2007 to 2011.
  
  
  METHODS
  Of the incident RVO cases in the database, RVO cases that occurred during the pregnancy-associated period, which spanned a 52-week period from 40-weeks-before to 12-weeks-after childbirth, were identified. Of these cases, the presence of pre-eclampsia/eclampsia was determined.
  
  
  METHODS
  The standardized incidence ratios (SIRs) of RVO in the general pregnant population and in the pregnant population with pre-eclampsia/eclampsia were determined with respect to the age-matched general female population.
  
  
  RESULTS
  Pregnancy-related RVO was identified in 33 cases from the 1.8 million women who experience childbirth during the study period, while the expected number of cases calculated by the direct standardization to the age-matched general population was 113. Of the 33 patients, 12 patients (36.4%) had pre-eclampsia or eclampsia. The SIR for the general pregnant population in reference to the age-matched general female population was 0.29 (95% CI, 0.20-0.41). In contrast, the SIR for the pregnant population with pre-eclampsia/eclampsia in reference to the age-matched general female population and the age-matched general pregnant population was 67.50 (95% CI, 34.88-117.92) and 246.50 (95% CI, 127.37-430.59), respectively.
  
  
  CONCLUSIONS
  The results suggest that pre-eclampsia/eclampsia is a risk factor for RVO, while pregnancy itself may not be a risk factor for RVO.
authors.affiliation: Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
authors.forename: Sang Jun
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Medical Research Collaborating Center, Seoul National University Hospital and Seoul National University College of Medicine, Seoul, Republic of Korea; Institute of Environmental Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.
authors.forename: Nam-Kyong
authors.initials: NK
authors.lastname: Choi
authors.affiliation: Medical Research Collaborating Center, Seoul National University Hospital and Seoul National University College of Medicine, Seoul, Republic of Korea.
authors.forename: Kyung Ha
authors.initials: KH
authors.lastname: Seo
authors.affiliation: Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
authors.forename: Kyu Hyung
authors.initials: KH
authors.lastname: Park
authors.affiliation: Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
authors.forename: Se Joon
authors.initials: SJ
authors.lastname: Woo
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D004461:Eclampsia / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D011225:Pre-Eclampsia / Q000453:epidemiology*; D011247:Pregnancy; D056910:Republic of Korea; D012170:Retinal Vein Occlusion / Q000150:complications / Q000453:epidemiology*