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Forces required for dilatation of human cervix in first trimester of pregnancy
1Department of Obstetrics and Gynaecology, Karolinska Institute, Danderyds Hospital, Sweden.
Cervical resistance to dilatation was measured in 76 patients undergoing first trimester legal abortion; a specially designed force-sensing instrument was used. No correlation between cervical resistance and patient age or gestational age was found. Increasing parity and earlier legal abortions were significantly correlated with a lowering of the cervical resistance. In patients dilated to 11 mm a lowering of resistance was noted suggesting a tear in cervical tissue.
Cervical resistance to dilatation was measured in 76 patients undergoing first trimester legal abortion; a specially designed force-sensing instrument was used. No correlation between cervical resistance and patient age or gestational age was found. Increasing parity and earlier legal abortions were significantly correlated with a lowering of the cervical resistance. In patients dilated to 11 mm a lowering of resistance was noted suggesting a tear in cervical tissue.