Fetal electrocardiogram changes in relation to fetal heart rate patterns during labor

Pardi, Giorgio; Tucci, E; Uderzo, Amos; Zanini, Dino

doi:10.1016/0002-9378(74)90555-9

Cited by 53 publications

(28 citation statements)

References 8 publications

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“…Elevation of Τ wave was described by PARDI [11] in association with variable and late acceleration during labor. Similar changes combined with ST segment elevation occured in fetal lambs during induced maternal hypoxia [13].…”

Section: Discussionmentioning

confidence: 99%

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Interpretation of the fetal ECG during labor: the effect of uterine contractions

Thaler

Timor²,

Goldberg³

1988

Jpme

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Section: Discussionmentioning

confidence: 99%

“…More recently computerbased systems have been employed to enhance the fetal ECG, but the patterns obtained were inconsistent and sometimes contradictory [7,10,11,16]. In the earlier computer-based systems, signal enhancement for providing a good signal-to-noise ratio, distorted the low frequency components of the P and ST waveforms [10].…”

Section: Introductionmentioning

confidence: 99%

Interpretation of the fetal ECG during labor: the effect of uterine contractions

Thaler

Timor²,

Goldberg³

1988

Jpme

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“…Some studies (Symonds 1971;Lee and Blackwell 1974;Pardi et al 1974;Rosen and Kjellmer 1975) indicate that changes in fetal QT interval and T wave are associated with fetal hypoxia and acidemia; therefore, the detection of T wave is an important task in fetal ECG.…”

Section: Discussionmentioning

confidence: 99%

Successful Detection of the Fetal Electrocardiogram Waveform Changes during Various States of Singletons

Sato

Hoshiai

Ito

et al. 2011

Tohoku J. Exp. Med.

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Accurate assessment of fetal well-being is one of the most important tasks for obstetricians. It is still difficult to measure fetal electrocardiogram (ECG) during fetal movements. Recently, a new method, blind source separation with reference signals, was proposed for stable measurements. This method distinguishes weak signals from noisy mixed signals with little information about the sources. The aim of this study is to estimate the ability of this method for fetal ECG monitoring and to establish standard fetal ECG electrocardiogram values of normal singletons including during fetal movement. The subjects enrolled were 167 pregnant women with normal single pregnancy from 18-to 41-week gestation, who regularly visited Tohoku University Hospital, and 12 pregnant women with fetal abnormality. Fetal signals were successfully separated in 163 of 179 subjects at 91.1% success rate regardless of fetal movements. Time intervals of ECG (P, PR and QRS intervals and QTc) were measured. The standard curves of each interval through the gestational period were obtained. The data in active phase were compared to that in rest phase and the data obtained from normal and abnormal fetuses were investigated. PR intervals in the rest phase were prolonged compared to those in the active phase. Fetal ECG showed anomalous values such as PR interval or QTc prolongation in the abnormal fetuses. The fetal ECG was measured by the new method with or without fetal movements, and the standard fetal ECG values have been established. This study provides a foundation for further detailed clinical studies.

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“…Unfortunately the matter of time constants and especially the P-R interval is, as yet, a relatively unexplored area in fetal physiology and several clinical researches trying to relate changes in time constants with human fetal well being have reached discordant results [5,6,8,10,12]. As there is a lack of pathophysiological model of interpretation we believe that is important first of all to focus our attention to the epidemiology of P-R changes in relation to R-R changes during labour.…”

Section: Introductionmentioning

confidence: 99%

European Community Multicentre Trial “Fetal ECG Analysis During Labour”: the P-R Interval

Luzietti

Erkkola²,

Hasbargen³

et al. 1997

Jpme

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The aim of the European Community Multicentre Trial on Fetal ECG Analysis During Labour was to collect a clinical database of electrocardiograms on which the different patterns of ST waveform and time interval changes, so far identified, could be studied. The aim of this paper was to study the PR-RR relationship and the P wave patterns during normal labour. One thousand three hundred fifty accelerations and 350 decelerations were analysed in 618 labours, all with normal fetal outcome. All ECGs were recorded with the STAN recorder and linked to a PC system for data acquisition and analysis. A positive relationship between P-R and R-R intervals was identified in all reactive fetal heart rate traces. A P-R shortening was identified also with all decelerations of more than 40 bpm from the baseline, resulting in a negative PR-RR relationship. Experimental works have described a P-R shortening concurrent with the maximal R-R lengthening during acutely induced hypoxemia in fetal lambs. In our study normal cord acid-base status indicated that the majority of bradycardia episodes recorded were not related to acute hypoxemia: PR-RR relationship changes seem therefore to indicate an intact physiological fetal heart adaptive response to rapid change in the environment of either hypoxemic or haemodynamic origin. A negative PR-RR relationship by itself seems to be nothing more than an indicator of decelerations during labour and seems unable to discriminate between decelerations of different origin. Finally the P wave was no longer detectable during decelerations of more than 800 msec: in this situation the P-R interval can not be reliably measured.

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Fetal electrocardiogram changes in relation to fetal heart rate patterns during labor

Cited by 53 publications

References 8 publications

Interpretation of the fetal ECG during labor: the effect of uterine contractions

Interpretation of the fetal ECG during labor: the effect of uterine contractions

Successful Detection of the Fetal Electrocardiogram Waveform Changes during Various States of Singletons

European Community Multicentre Trial “Fetal ECG Analysis During Labour”: the P-R Interval

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