Skip to main content

Corticosteroids and fetal vasculature: effects of hydrocortisone, dexamethasone and betamethasone on human umbilical artery

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

Objective

To investigate the direct effects of corticosteroids on human umbilical artery resistance, in vitro. Design

Prospective laboratory study. Setting

University teaching hospital. Samples and methods

Umbilical artery samples were obtained following normal, term deliveries ( n= 50 ) and dissected rings were suspended for isometric recording under physiological conditions. The effects of hydrocortisone ( 10−9–10−4 M ), dexamethasone ( 10−9–10−4 M ) and betamethasone ( 10−9–10−4 M ) on umbilical artery resistance were measured in vitro. Main outcome measures

Changes in umbilical artery resistance, in vitro. Results

Hydrocortisone ( n= 12 ) exerted a vasodilatory effect on human umbilical artery at all concentrations studied compared with vehicle control experiments ( n= 12 ) ( P < 0.0001 ). The mean net relaxant effect of hydrocortisone ranged from 11.77% ( 10−9 M ) to 57.01% ( 10−4 ). Both exogenous compounds, dexamethasone ( n= 12 ) and betamethasone ( n= 12 ), similarly exerted a significant relaxant effect on human umbilical artery tone ( P < 0.05–0.01 ), compared with vehicle control experiments ( n= 12 ). The mean net relaxant effect of dexamethasone ranged from 14.43% ( 10−9 M ) to 38.12% ( 10−4 ) and that of betamethasone ranged from 6.02% ( 10−9 M ) to 42.30% ( 10−4 ), in a cumulatively increasing fashion. There was a non-significant trend towards a greater vasodilatory effect of dexamethasone than betamethasone at lower bath concentrations studied. Conclusion

Corticosteroids exert a direct and potent vasodilatory effect on human umbilical artery resistance in vitro, thus providing an explanation for the previously unexplained vascular effects associated with antenatal administration of corticosteroids.

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1471-0528.2002.01540.x

Publication date: 2002-10-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more