TY - JOUR
T1 - Microvascular vasodilator response to acetylcholine is increased in women with pre-eclampsia
AU - Davis, Karl R.
AU - Ponnampalam, Janani
AU - Hayman, Richard
AU - Baker, Philip N.
AU - Arulkumaran, Sabaratnam
AU - Donnelly, Richard
PY - 2001/6
Y1 - 2001/6
N2 - Objectives: To evaluate in vivo microvascular responses to incremental doses of the endothelial-dependent vasodilator, acetylcholine, and the endothelial-independent vasodilator, sodium nitroprusside, in women with pre-eclampsia and gestation-matched normotensive pregnant controls. Design: Prospective clinical study. Setting: Southern Derbyshire Acute Hospitals Trust, and University of Nottingham Division of Vascular Medicine. Population: Thirteen women with pre-eclampsia and 16 normotensive pregnant controls. Methods: Cutaneous microvascular vasodilator responses to iontophoretic administration of incremental doses of acetylcholine and sodium nitroprusside (25-100μC) were evaluated under temperature-controlled conditions using laser Doppler fluximetry. Results: Resting skin temperature and blood flow were similar among 13 women with pre-eclampsia [mean blood pressure 151/93 mmHg (4/3); mean gestation 35.6 weeks (1.0); and mean proteinuria 1.1 g/24h (0.2)] and 16 normotensive pregnant controls [mean blood pressure 111/63 mmHg (2/2); mean gestation 34.3 weeks (0.9)]. Peak vasodilator responses to acetylcholine were increased in women with pre-eclampsia (median flux ratio 15.1 [IQR 12.3-17.6] vs 11.7 [IQR 8.4-12.6], P < 0.05), whereas sodium nitroprusside responses were not different between the two groups: 11.4 [IQR 8.6-13.4] vs 9.5 [IQR 8.0-12.3]. Conclusion: In vivo microvascular vasodilator responses to acetylcholine are increased in women with pre-eclampsia, while endothelial-independent vasodilation is unchanged. Although the mechanism of acetylcholine induced vasodilation in small vessels is unclear, this study confirms previous animal data and provides in vivo evidence of altered microvascular endothelial cell function in pre-eclampsia.
AB - Objectives: To evaluate in vivo microvascular responses to incremental doses of the endothelial-dependent vasodilator, acetylcholine, and the endothelial-independent vasodilator, sodium nitroprusside, in women with pre-eclampsia and gestation-matched normotensive pregnant controls. Design: Prospective clinical study. Setting: Southern Derbyshire Acute Hospitals Trust, and University of Nottingham Division of Vascular Medicine. Population: Thirteen women with pre-eclampsia and 16 normotensive pregnant controls. Methods: Cutaneous microvascular vasodilator responses to iontophoretic administration of incremental doses of acetylcholine and sodium nitroprusside (25-100μC) were evaluated under temperature-controlled conditions using laser Doppler fluximetry. Results: Resting skin temperature and blood flow were similar among 13 women with pre-eclampsia [mean blood pressure 151/93 mmHg (4/3); mean gestation 35.6 weeks (1.0); and mean proteinuria 1.1 g/24h (0.2)] and 16 normotensive pregnant controls [mean blood pressure 111/63 mmHg (2/2); mean gestation 34.3 weeks (0.9)]. Peak vasodilator responses to acetylcholine were increased in women with pre-eclampsia (median flux ratio 15.1 [IQR 12.3-17.6] vs 11.7 [IQR 8.4-12.6], P < 0.05), whereas sodium nitroprusside responses were not different between the two groups: 11.4 [IQR 8.6-13.4] vs 9.5 [IQR 8.0-12.3]. Conclusion: In vivo microvascular vasodilator responses to acetylcholine are increased in women with pre-eclampsia, while endothelial-independent vasodilation is unchanged. Although the mechanism of acetylcholine induced vasodilation in small vessels is unclear, this study confirms previous animal data and provides in vivo evidence of altered microvascular endothelial cell function in pre-eclampsia.
UR - http://www.scopus.com/inward/record.url?scp=0035377922&partnerID=8YFLogxK
U2 - 10.1016/S0306-5456(00)00144-3
DO - 10.1016/S0306-5456(00)00144-3
M3 - Article
C2 - 11426896
AN - SCOPUS:0035377922
SN - 0306-5456
VL - 108
SP - 610
EP - 614
JO - British Journal of Obstetrics and Gynaecology
JF - British Journal of Obstetrics and Gynaecology
IS - 6
ER -