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Routine umbilical cord blood gas determinations?
J A Thorp1, J E Sampson, V M Parisi
1Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Texas Medical School, Houston.
American Journal of Obstetrics and Gynecology
|September 1, 1989
Summary
Umbilical cord arterial pH measurement is recommended for all newborns. This test accurately documents fetal acid-base balance and helps rule out birth asphyxia in depressed infants.
Area of Science:
- Neonatal Medicine
- Obstetrics
- Perinatal Research
Background:
- Assessing newborn well-being immediately after birth is crucial.
- Umbilical cord blood gas analysis is a potential tool for evaluating fetal acid-base status.
Purpose of the Study:
- To evaluate the significance of umbilical cord blood gas levels in term nulliparous patients.
- To determine the correlation between cord blood gases and newborn depression (Apgar scores).
Main Methods:
- Studied 1924 term nulliparous patients with spontaneous labor onset.
- Measured umbilical cord arterial and venous pH values.
- Analyzed Apgar scores and incidence of newborn depression.
Main Results:
- Umbilical cord arterial pH (7.24) and venous pH (7.32) were recorded.
- 14.1% of newborns exhibited depression (Apgar < 7).
- Umbilical cord arterial blood acidemia in vigorous newborns was not a strong predictor of immediate morbidity.
Conclusions:
- Umbilical cord arterial pH measurement is valuable for documenting normal fetal acid-base balance.
- Arterial pH is the recommended measurement, reflecting fetal status more accurately than other tests.
- Cord blood pH aids in ruling out birth asphyxia in depressed newborns.