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Myometrial and placental artery reactivity alone cannot explain reduced placental perfusion in pre-eclampsia and intrauterine growth restriction.
- Source :
-
BJOG : an international journal of obstetrics and gynaecology [BJOG] 2003 Oct; Vol. 110 (10), pp. 909-15. - Publication Year :
- 2003
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Abstract
- Objectives: (1) To investigate a possible association between myometrial and placental artery vasoreactivity and perfusion at the basal and chorionic plates, respectively. (2) To confirm that myometrial arteries from women with pre-eclampsia and intrauterine growth restriction exhibit an attenuated endothelium-dependent vasodilatory response.<br />Methods: Women with normal pregnancy, pre-eclampsia and intrauterine growth restriction had a magnetic resonance scan to assess placental perfusion using a technique called intravoxel incoherent motion. At delivery, myometrial and chorionic plate placental arteries were assessed on a wire myograph. Vessels were pre-constricted with the thromboxane mimetic U46619 and dilated with incremental doses of bradykinin.<br />Results: Pre-constricted myometrial arteries from women with pre-eclampsia or intrauterine growth restriction exhibited an attenuated vasodilatory response to bradykinin, compared with normal pregnancy (P < 0.0001). Pre-constricted placental arteries exhibited a minimal vasodilatory response in all three groups of women (P = 0.10). Maximal constrictor and vasodilatory responses of myometrial arteries were not associated with the perfusing fraction at the basal plate. Maximal constrictor and vasodilatory responses of chorionic plate placental arteries were not associated with the perfusing fraction at the chorionic plate.<br />Conclusion: We confirm that myometrial arteries from women with pre-eclampsia or intrauterine growth restriction exhibit an attenuated endothelium-dependent vasodilatory response. Apart from vasoreactivity of small arteries, other factors may be involved in the control of placental perfusion.
- Subjects :
- 15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid pharmacology
Adult
Analysis of Variance
Arteries physiology
Female
Fetal Growth Retardation etiology
Humans
Placental Circulation physiology
Pre-Eclampsia etiology
Pregnancy
Vasoconstrictor Agents pharmacology
Vasodilation physiology
Fetal Growth Retardation physiopathology
Myometrium blood supply
Placenta blood supply
Pre-Eclampsia physiopathology
Subjects
Details
- Language :
- English
- ISSN :
- 1470-0328
- Volume :
- 110
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- BJOG : an international journal of obstetrics and gynaecology
- Publication Type :
- Academic Journal
- Accession number :
- 14550360