The STAN and Nottingham FECG monitors show poor clinical agreement in T:QRS ratio measurements during labour due to different reference points for S-T segment and T-wave height.
T:QRS ratios from different FECG systems should not be interchanged during labour; leaves open standardization needs for fetal monitoring research.
OBJECTIVE: To compare the T:QRS ratio recorded by the STAN and Nottingham fetal electrocardiogram (FECG) monitors. DESIGN: Prospective observational study. SETTING: London teaching hospital delivery suite and research unit. METHODS AND SUBJECTS: The T:QRS ratios generated by the STAN and Nottingham FECG monitors were simultaneously recorded and compared using signals generated from a computer-produced ECG signal and signals from 11 term fetuses recorded during labour. RESULTS: There was an acceptable level of agreement between the two systems with the computer-generated signals, but it was not clinically acceptable with the signals from the fetuses recorded during labour. Disagreements in the T:QRS values were probably due to differences in the reference points for the measurement of the S-T segment and T-wave height. CONCLUSION: The different points of reference for measurement of S-T segment and T-wave height can explain poor agreement between the two methods of FECG waveform analysis. The suggested adopted points of reference are those corresponding to adult electrocardiographic methodology.
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Skillern et al. (1994) studied this question.
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