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Variation in the T/QRS ratio of fetal electrocardiograms recorded during labour in normal subjects
Author(s) -
NEWBOLD SANDRA,
WHEELER TIMOTHY,
CLEWLOW FRANK,
SOUL FRANCES
Publication year - 1989
Publication title -
bjog: an international journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.157
H-Index - 164
eISSN - 1471-0528
pISSN - 1470-0328
DOI - 10.1111/j.1471-0528.1989.tb01653.x
Subject(s) - qrs complex , medicine , cardiology
Summary. The T/QRS ratio of the fetal ECG was obtained during labour from 25 women with normal pregnancies. The poor signal‐to‐noise ratio of the unprocessed signals, chiefly due to baseline wander, led to a wide variation between individual measurements. This problem was overcome by data averaging, the ratio being expressed as a mean over 1‐min epochs. The average T/QRS ratio of each labour record ranged from 4% to 23% with a mean of 10% (for all 25). The average range (between 5th and 95th centile) of the 1‐min T/QRS ratios was 13% and there were no significant changes as labour progressed. The effect of contractions on the T/QRS ratio was measured from eight subjects and found to be inconsistent.