Continuous recording of fetal pH during labor

Area of Science:

• Obstetrics and Gynecology
• Fetal Monitoring
• Perinatal Medicine

Background:

• Accurate fetal assessment during labor is crucial for optimal outcomes.
• Existing methods for fetal blood sampling can be invasive and time-consuming.
• There is a need for continuous, non-invasive fetal monitoring techniques.

Purpose of the Study:

• To evaluate the efficacy of subcutaneous fetal pH monitoring during labor.
• To correlate subcutaneous pH values with fetal heart rate (FHR) and uterine pressure (UP).
• To assess the reliability of subcutaneous pH as an indicator of fetal status.

Main Methods:

• Simultaneous monitoring of FHR, UP, and subcutaneous pH in 58 fetuses during labor.
• Correlation analysis of subcutaneous pH with capillary blood pH (98 samples) and umbilical vein blood pH (46 samples).
• Analysis of high-quality records (44) correlated with capillary blood samples (68).

Main Results:

• Subcutaneous pH showed moderate correlation with capillary blood pH (0.649) and umbilical vein blood pH (0.39).
• A strong correlation (0.95) was observed between subcutaneous pH and capillary blood pH in a selected group of 44 good-quality records.
• The technique demonstrated potential for reliable fetal pH assessment.

Conclusions:

• Subcutaneous pH monitoring shows promise as a viable method for assessing fetal well-being during labor.
• This technique may offer a less invasive alternative to traditional fetal blood sampling.
• Further clinical validation is warranted to establish its routine use in obstetric practice.