The effect of dilute vasopressin solution on the force needed for cervical dilatation: a randomized controlled trial.


OBJECTIVE To assess the force needed to mechanically dilate the cervix of a nonpregnant woman after intracervically injecting dilute (0.05 U/mL) vasopressin solution. METHODS In a randomized, double-blind study, equal amounts of either a dilute vasopressin solution or placebo (normal saline) were injected into the intracervical stroma at 4- and 8-o'clock… (More)