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Acta Obstet Gynecol Scand. 1974;53(4):293-302.

Cervical consistency in women of fertile age measured with a new mechanical instrument.



An investigation was undertaken on 100 nonpregnant and 49 pregnant women to measure the fibroelasticity of the uterine cervix in regular menstrual periods, in instances of combined oral contraceptive use, and in normal pregnancies. An instrument designed for measurement of the consistency of the uterine cervix was used. The instrument consists of 2 mechanisms, 1 for control of the force used and another for recording the tissue consistency. The cervical consistency is characterized by the angle alpha between the walls of the impressed surface recorded on the indicator mechanism of the instrument. The highest values of alpha are found in the softest tissues. There was a highly significant interindividual difference (p less than .01) between 30 of the nonpregnant patients who had from 3 to 6 measurements performed in different menstrual cycles (intraclass correlation r=.612 plus or minus .083. Variation about the individual mean is only 1/F=13.6%. A rise in the mean measured values was noted during the first phase of the menstrual cycle in the nonpregnant cervix. There were slightly higher mean values in oral contraceptive users. The measurements showed significantly different values in 3 different time intervals in normal pregnancies, with the highest values near term. The values fell to approach the normal values for nonpregnant women within a few weeks after parturition.

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