Abstract
The effect of verapamil on the contractile response to norepinephrine in isolated, suffused uterine arteries from pregnant and nonpregnant humans was investigated. The arteries, obtained after hysterectomy, were dissected free from surrounding tissue and arterial rings were prepared and mounted in tissue chambers filled with Krebs-bicarbonate solution. Isometric tension was recorded. There was no significant difference between arteries from pregnant patients and arteries from nonpregnant patients when maximal contractile response and sensitivity to nonepinephrine were compared. At concentrations of 0.3 and 3 μM, verapamil attenuated the response to norepinephrine in uterine arteries from both pregnant and nonpregnant patients. However, verapamil was significantly more potent in blocking the response to norepinephrine in arteries from pregnant patients.
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