title: The origin of endothelin-1 in patients with severe preeclampsia.
abstract: OBJECTIVE
  To determine the site of origin of increased concentrations of plasma endothelin-1 in patients with severe preeclampsia.
  
  
  METHODS
  Twelve patients with severe preeclampsia undergoing an indicated abdominal delivery had endothelin-1 levels measured from plasma specimens drawn from right and left uterine and antecubital veins before delivery and after placenta removal with uterine curettage. Twelve uncomplicated control patients undergoing abdominal delivery had endothelin-1 concentrations drawn by an identical protocol. Clinical staff members were blinded to endothelin-1 results and laboratory staff were blinded to patient group assignment and sample source. Endothelin-1 plasma concentrations were determined by radioimmunoassay and data were analyzed by paired t test.
  
  
  RESULTS
  No difference in endothelin-1 concentration was noted with respect to placental location, central versus peripheral, or predelivery versus postdelivery sampling procedures. Overall, patients with preeclampsia had higher plasma concentrations of endothelin-1 (mean 11.0 +/- 6.6 pg/mL) compared with normotensive patients (mean 8.4 +/- 6.7 pg/mL, P < .005).
  
  
  CONCLUSIONS
  The decidual-placental interface does not appear to be the source of increased plasma endothelin-1 concentrations found in severe preeclampsia. The origin of this increase remains uncertain.
authors.affiliation: Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, USA.
authors.forename: O A
authors.initials: OA
authors.lastname: Rust
authors.forename: J A
authors.initials: JA
authors.lastname: Bofill
authors.forename: D H
authors.initials: DH
authors.lastname: Zappe
authors.forename: J E
authors.initials: JE
authors.lastname: Hall
authors.forename: J C
authors.initials: JC
authors.lastname: Burnett
authors.forename: J N
authors.initials: JN
authors.lastname: Martin
mesh_terms: D000328:Adult; D001800:Blood Specimen Collection; D016022:Case-Control Studies; D036861:Delivery, Obstetric; D019332:Endothelin-1 / Q000096:biosynthesis* / Q000097:blood*; D005260:Female; D006801:Humans; D010920:Placenta; D011225:Pre-Eclampsia / Q000378:metabolism*; D011247:Pregnancy; D012720:Severity of Illness Index; D016037:Single-Blind Method; D013997:Time Factors
chemical_list: D019332:Endothelin-1