Forces required for dilatation of human cervix in first trimester of pregnancy
| Autor: | A. Molin, J. Brundin |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Aging
medicine.medical_specialty Population Biophysics Gestational Age Cervix Uteri Abortion Dilatation and Curettage Pregnancy medicine Humans education Cervix Gynecology education.field_of_study business.industry Obstetrics Gestational age medicine.disease Parity Pregnancy Trimester First medicine.anatomical_structure Clinical research Family planning Abortion Legal Gestation Female business |
| Zdroj: | Journal of Biomedical Engineering. 14:527-529 |
| ISSN: | 0141-5425 |
| DOI: | 10.1016/0141-5425(92)90108-w |
| Popis: | 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.In Sweden, physicians measured cervical resistance to dilatation in 76 women with a first trimester pregnancy who came to Danderyds Hospital of the Karolinska Institute to undergo legal abortion. They did not prepare the cervix before the abortion. They used Pratt dilators complete with a pressure transducer to dilate the cervix 9-11 mm. They dilated the cervix to 9 mm in women of gestational age no more than 10 weeks and to 11 mm in women of 11 weeks gestational age. Cervical resistance was not associated with either patient age or gestational age. Reduced cervical resistance was significantly associated with increasing parity. Women who had had a previous legal abortion experienced less cervical resistance than those who had never had a previous abortion. Cervical resistance increased up to a diameter of 10 mm and fell for the 11 mm dilator, suggesting a tear in cervical tissue. These findings indicated that physicians should ideally conduct first trimester abortions before the 11th week of pregnancy to keep from dilating the cervix to more than 9 mm. The researchers recommended that their colleagues should soften the cervix preoperatively in nulliparous patients and in all late first trimester abortions. |
| Databáze: | OpenAIRE |
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