Phase‐rectified signal averaging: correlation between two monitors and relationship with short‐term variation of fetal heart rate

ABSTRACT Objectives To establish the correlation between phase‐rectified signal averaging (PRSA) outputs obtained from a novel self‐applicable non‐invasive fetal electrocardiography (NIFECG) monitor with those from computerized cardiotocography (cCTG). A secondary objective was to evaluate the poten...

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Bibliographic Details
Published in:Ultrasound in obstetrics & gynecology 2023-06, Vol.61 (6), p.765-772
Main Authors: Liu, B., Thilaganathan, B., Bhide, A.
Format: Article
Language:English
Subjects:
ambulatory monitoring
Cardiotocography - methods
computerized cardiotocography
Deceleration
EKG
Electrocardiography
Female
fetal heart‐rate monitoring
Fetal Monitoring
Fetuses
Gynecology
Heart rate
Heart Rate, Fetal - physiology
Humans
Monitoring
non‐invasive fetal electrocardiography
Obstetrics
phase‐rectified signal averaging
Pregnancy
Prenatal Care
Prospective Studies
short‐term variation
Signal averaging
Ultrasonic imaging
Ultrasound
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Summary:ABSTRACT Objectives To establish the correlation between phase‐rectified signal averaging (PRSA) outputs obtained from a novel self‐applicable non‐invasive fetal electrocardiography (NIFECG) monitor with those from computerized cardiotocography (cCTG). A secondary objective was to evaluate the potential for remote assessment of fetal wellbeing by determining the relationship between PRSA and short‐term variation (STV). Methods This was a prospective observational study of women with a singleton pregnancy over 28 + 0 weeks' gestation attending a London teaching hospital for cCTG assessment. Participants underwent concurrent cCTG and NIFECG monitoring for up to 60 min. Averaged accelerative (AAC) and decelerative (ADC) capacities and STV were derived by postprocessing and filtration of signals, generating fully (F) and partially (P) filtered results. Linear correlation and accuracy and precision analysis were performed to assess the relationship between PRSA outputs from cCTG and NIFECG, using varying anchor thresholds, and their association with STV. Results A total of 306 concurrent cCTG and NIFECG traces were collected from 285 women. F‐filtered NIFECG PRSA (eAAC/eADC) results were generated from 65% of traces, whereas cCTG PRSA (cAAC/cADC) outputs were generated from all. Strong correlations were observed between cAAC and F‐filtered eAAC (r = 0.879, P 
ISSN:0960-7692
1469-0705
DOI:10.1002/uog.26192