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[Determination of intrauterine pressure using catheter-tip transducer inserted outside fetal membranes]
H Yagami1, O Kurauchi, T Furui
1Department of Obstetrics and Gynecology, Kakegawa Municipal General Hospital, Shizuoka.
To determining intrauterine pressure outside fetal membranes, we used a catheter-tip transducer to study 20 women before the occurrence membrane rupture. Their mean age was 28.2 +/- 3.4 years and all women were in weeks 37 to 41 of pregnancy when studied. In the first stage of labor, the peak intrauterine pressure was 60.0 +/- 12.5 mmHg (mean +/- SD) when the external os was dilated 4 to 6 cm, 90.0 +/- 14.8 mmHg, at 7 to 8 cm dilation, and 80.0 +/- 11.5 mmHg at 9 cm or greater dilation. Each pressure wave lasted 45 to 55 sec. The highest baseline pressure (28.0 +/- 4.5 mmHg) was obtained when the subjects were sitting. A baseline pressure of 17.0 +/- 4.0 mmHg was obtained in the supine position, as well as a value of 21.0 +/- 3.5 mmHg in the recumbent position. There were no complications related to the catheter-tip transducer. Our findings indicate that this method is both accurate and reliable in determining the amounts of intrauterine pressure to which fetal membranes are subjected.
To determining intrauterine pressure outside fetal membranes, we used a catheter-tip transducer to study 20 women before the occurrence membrane rupture. Their mean age was 28.2 +/- 3.4 years and all women were in weeks 37 to 41 of pregnancy when studied. In the first stage of labor, the peak intrauterine pressure was 60.0 +/- 12.5 mmHg (mean +/- SD) when the external os was dilated 4 to 6 cm, 90.0 +/- 14.8 mmHg, at 7 to 8 cm dilation, and 80.0 +/- 11.5 mmHg at 9 cm or greater dilation. Each pressure wave lasted 45 to 55 sec. The highest baseline pressure (28.0 +/- 4.5 mmHg) was obtained when the subjects were sitting. A baseline pressure of 17.0 +/- 4.0 mmHg was obtained in the supine position, as well as a value of 21.0 +/- 3.5 mmHg in the recumbent position. There were no complications related to the catheter-tip transducer. Our findings indicate that this method is both accurate and reliable in determining the amounts of intrauterine pressure to which fetal membranes are subjected.