[Continuous measurement of pH in fetus during delivery].
Explore the source record for details and available documents.
Female↗
Biomedical subjects
S Hahn-Pedersen
Publications and source records attributed to S Hahn-Pedersen.
Normal values for fetal scalp tissue pH during labour.
Normal values for fetal scalp tissue pH during labour were determined by using a glass electrode (Kontron-Roche). A total of 132 recordings was obtained and 84 (64 per cent) were of good quality. After a good quality recording had been obtained, there were 64 infants with an Apgar score of 9 or 10 at one and five minutes after delivery. The 64 recordings showed pH values (Mean +/- 2SEM) of 7.38 +/- 0.12 six hours before delivery and 7.28 +/- 0.12 at the time of delivery. Between the 5th and 55th minutes of the second stage of labour the pH (Mean +/- 2SEM) fell from 7.30 +/- 0.14 to 7.20 +/- 0.13.
Female↗
Analysis of sixty consecutive cases of continuous fetal pH measurement.
60 consecutive fetal CTG-pH-registrations (cardiotocography with continuous pH registration) were analyzed in order to find the causes of the nonsuccessful tracings. Of the 60 tracings, 21 were of good quality, 16 partly successful, and 23 nonsuccessful. The monitoring for each patient had lasted for an average of 154 min with the range of 5--530 min. The quality of the pH recordings were not related to the duration of the pH observation, the maternal age and parity, or to the weight of the infant. If the electrode was applied too early (cervical orifice less than 5 cm) there was a greater risk of a nonsuccessful tracing. The drift of the electrode was less than 0.06 pH-units in 90% of the cases. The rate of nonsuccessful tracings is still too high and the difficulty in sterilization, calibration, and application of the electrode is still rather pronounced. At this moment the pH-electrode should be reserved for scientific use.
Electrodes↗
Continuous fetal tissue pH recordings during labour. A preliminary report.
We made continuous fetal pH-measurement in 50 patients and showed a good correlation between tissue pH and umbilical artery, umbilical vein and the fetal scalp blood pH. There were practical problems in the use of the glass pH electrode.
Female↗