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Eighty-five human fetuses were studied during labor by continuously monitoring the
fetal heart rate (FHR) and uterine contractions and correlating FHR patterns with
218 averaged values of fetal pH derived from 618 single samples. The FHR patterns
in the 20 minutes immediately preceding the fetal blood sampling period were used
for correlation. In general, the correlation between FHR base-line levels and fetal
pH is poor. When tachycardia was present slightly more than half of the pH values
were in the pH range above 7.25, and slightly less than 30 per cent were in the range
of 7.20 or less. Specific FHR deceleration patterns are definitely associated with
disturbances in acid-base balance. This is especially true of late deceleration and
severe variable deceleration. Moderate variable deceleration is also associated with
a minor shift to the acid side. Of the 102 pH values associated with an innocuous FHR pattern, 94 per cent were above 7.25 pH units.
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Article Info
Footnotes
This investigation was supported in part by Research Grants HD 01467-03 and 5K03 HD 18,295-06 from the National Institute of Child Health and Human Development.
Identification
Copyright
© 1969 The C. V. Mosby Company. Published by Elsevier Inc. All rights reserved.
