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[Comments on pH-metry in umbilical cord blood]
1Frauenklinik des Kreiskrankenhauses Detmold, Kreiskrankenhauses Detmold.
Geburtshilfe Und Frauenheilkunde
|August 1, 1991
Summary
Extremely low umbilical cord pH values in newborns do not always indicate brain damage. Fetal acid-base balance is influenced by maternal respiration, suggesting careful labor management is key.
Area of Science:
- Neonatal Medicine
- Obstetrics
- Fetal Physiology
Background:
- Investigates fetal acid-base balance and its correlation with neonatal outcomes.
- Examines a case of a premature newborn with extremely low umbilical cord pH but good Apgar scores and no neurological deficits.
Observation:
- A case report of a 33-week gestation newborn (1650g) with umbilical artery (UA) pH 6.697 and umbilical vein (UV) pH 6.803, yet Apgar scores of 8-10-10.
- The infant remained neurologically normal for 6 weeks post-delivery.
- Analysis of 2549 term singleton deliveries revealed 1% of newborns had UA pH < 7.100 and 16% had UA pH < 7.200.
Findings:
- Computational analysis indicates 86% of fetal acidotic load is due to fetal CO2 production, with 14% from metabolic processes.
- Maternal breathing during labor significantly influences fetal pH distribution.
- Variations in pH values across departments may stem from differing management of the second stage of labor.
Implications:
- Extremely low umbilical cord pH values may not be a definitive predictor of neonatal brain damage.
- Highlights the impact of maternal respiratory function and labor management on fetal acid-base status.
- Suggests a need to re-evaluate the clinical significance of low umbilical cord pH in predicting adverse neonatal neurological outcomes.