Key result
Ephedrine produced a greater ratio of maximal constriction at femoral versus uterine rings during pregnancy compared to metaraminol (5.2 vs 1.9), suggesting it spares uterine perfusion.
Why the study?
Does ephedrine compared to metaraminol differentially affect uterine versus systemic vascular constriction in pregnant ewes?
Population
Uterine and femoral vessels, with and without functional endothelium, from nonpregnant and pregnant ewes
Comparison
Ephedrine (10(-10)-10(-3) M) in vitro vs Metaraminol (10(-10)-10(-3) M) in vitro
Design
Preclinical
Authors
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May support ephedrine preference to preserve uterine perfusion in pregnancy; hypothesis-generating from ewe model and leaves open human translation.
Does ephedrine compared to metaraminol differentially affect uterine versus systemic vascular constriction in pregnant ewes?
Absolute Event Rate: 5.2% vs 1.9%
Ephedrine may spare uterine perfusion during pregnancy due to more selective constriction of systemic vessels compared to metaraminol.
Tong et al. (1992) studied Pregnancy. Ephedrine vs. Metaraminol was evaluated on Ratio of maximal effect at femoral versus uterine rings during pregnancy. Ephedrine produced a greater ratio of maximal constriction at femoral versus uterine rings during pregnancy compared to metaraminol (5.2 vs 1.9), suggesting it spares uterine perfusion.
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