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Computerised fetal heart rate analysis in labour--effect of sampling rate
A Chang1, D S Sahota, N N Reed
1Department of Obstetrics and Gynaecology, Prince of Wales Hospital, Shatin, N.T., Hong Kong.
Summary
Sampling fetal heart rate (FHR) every two seconds during labor accurately reflects the overall FHR. This efficient sampling rate allows for real-time objective analysis of fetal well-being.
Area of Science:
- Perinatal Medicine
- Biomedical Signal Processing
Background:
- Accurate fetal heart rate (FHR) monitoring is crucial during labor for assessing fetal well-being.
- Traditional FHR analysis may involve complex algorithms and high sampling rates, potentially limiting real-time processing.
Purpose of the Study:
- To evaluate the impact of a 2-second sampling rate on the accuracy of fetal heart rate recordings during labor.
- To determine if a reduced sampling rate is sufficient for reliable FHR analysis.
Main Methods:
- A prospective observational study involving 153 fetuses during labor.
- Fetal heart rate data was collected and sampled at 0.5 Hz (every 2 seconds).
- Statistical comparison of means and standard deviations of 5-minute segments against all beats within the same interval.
Main Results:
- A highly significant correlation was found between FHR means (r = 0.994, p < 0.001) and standard deviations (r = 0.957, p < 0.001) when sampled every 2 seconds compared to successive beat sampling.
- The 2-second sampling rate demonstrated high accuracy in representing the overall FHR signal.
Conclusions:
- A sampling rate of 2 seconds for fetal heart rate in labor is sufficient for accurate recording.
- This sampling rate enables complex analytical algorithms to process FHR signals in near real-time for objective analysis.
- The findings support the use of a 2-second sampling rate for efficient and accurate intrapartum fetal monitoring.