title: Association of vasa previa at delivery with a history of second-trimester placenta previa.
abstract: OBJECTIVE
  To evaluate whether vasa previa at delivery is associated with a history of second-trimester placenta previa.
  
  
  METHODS
  Retrospective, case-control study of all vasa previa cases at Good Samaritan Regional Medical Center from January 1, 1991, to May 1, 2001. Cases were identified by ICD-9 codes and confirmed by chart review. Each case was matched in a 1:4 ratio with controls based upon normal placentation at delivery, ultrasound documentation of midtrimester placental location, maternal parity and gestational age at delivery.
  
  
  RESULTS
  During the study period, 13 cases of vasa previa were identified. Nine cases (9/13, 69.2%) of vasa previa at delivery had a second-trimester placenta previa as documented by midtrimester ultrasonography, whereas 2 controls (2/52, 3.8%) had a second-trimester placenta previa (P < .000001, OR = 56.3, 95% CI = 8.9-354.1).
  
  
  CONCLUSIONS
  There is a highly significant association between vasa previa at delivery and a history of second-trimester placenta previa.
authors: Department of Maternal-Fetal Medicine, Good Samaritan Regional Medical Center, 1111 East McDowell, Phoenix, AZ 85006, USA. jknn4az@msn.com
authors: Karrie
authors: K
authors: Francois
authors: Staci
authors: S
authors: Mayer
authors: Cathleen
authors: C
authors: Harris
authors: Jordan H
authors: JH
authors: Perlow
mesh_terms: D000328:Adult; D001130:Arizona / Q000453:epidemiology; D016022:Case-Control Studies; D036861:Delivery, Obstetric; D003953:Diagnosis-Related Groups; D005260:Female; D006801:Humans; D007746:Labor Presentation; D008499:Medical Records; D010923:Placenta Previa / Q000150:complications / Q000000981:diagnostic imaging / Q000453:epidemiology*; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D012189:Retrospective Studies; D016216:Ultrasonography, Prenatal; D014470:Umbilical Cord