Quantification of fetal heart rate variability by abdominal electrocardiography

Kariniemi, V.; Hukkinen, Katja; Katila, T.; Laine, Hanna

doi:10.1515/jpme.1979.7.1.27

Cited by 18 publications

(9 citation statements)

References 3 publications

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“…In order to test the accuracy of the variability indices computed from aFECG, they were also computed from simultaneously recorded direct FECG. The correlation was good äs presented previously [4] and the smaller the indices are the better.…”

Section: Apparatus and Methodssupporting

confidence: 76%

“…The QRS detection pulses which create beat-to-beat differences exceeding the preset limit, 5 bpm in abdominal recordings and 10 bpm in direct recordings, are rejected [4]. The internal construction of the processor System uses a CMOS microprocessor, 2k read-onlymemory and a 4k random-access-memory (Fig.…”

Section: Apparatus and Methodsmentioning

confidence: 99%

“…These indices, the interval index (II) measuring the long-term variability, and the differential index (DI) measuring the short-term variability, have been shown to stay at a rather constant level during the first stage and to grow more abruptiy during the second stage of human labor [3]. Two groups have reported methods for quantification of FHRV during pregnancy [4,11]. The methods for quantitative measurement of FHRV so far have been "on-line" method for the same purpose during pregnancy and labor.…”

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confidence: 99%

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Technical note

1980

Journal of Perinatal Medicine

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An on-line methods for quantification of fetal heart rate variability (FHRV) from fetal electrocardiography (FECG) is presented. A CMOS microprocessor system with a 2k read-only-memory and a 4k random-access-memory is constructed. The processor is connected to a commercial cardiotocograph, and it calculates the interval index (II) measuring the long-term variability and the differential index (DI) measuring the short-term variability of FHR. The accuracy of the system was tested by calculating the FHRV indices from simultaneously recorded direct FECG and abdominal FECG. The correlation between the results of these two methods was good. II and DI were calculated serially for 34 fetuses during normal pregnancies. The FHRV analysis succeeded in 80-100 percent of patients from the 20th until the 27th week of gestation and again from the 35th week until term. The method was less successful, 35-70 percent, between gestational weeks 28 and 34. On average, II and DI grew as the gestation advanced. II had a greater scatter than DI and it was considered to measure mainly the fetal arousal level. DI on the other hand was not below three after the 30th week of gestation. DI may become a new marker of fetal status also in antepartum fetal surveillance.

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Section: Apparatus and Methodssupporting

confidence: 76%

Section: Apparatus and Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Technical note

1980

Journal of Perinatal Medicine

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“…The correlation was similar to the values reported in previous comparisons in the literature between noninvasive methods and scalp electrodes. 8,9 Transabdominal fECG, therefore, seems to be a valid and accurate substitute for other noninvasive FHR monitoring techniques. The fECG technique has the advantages that its true ambulatory character enables long-term recordings, that the quality of its recording is not influenced by the women's BMI, which is becoming of increasing importance, and that the technique is purely noninvasive.…”

Section: Discussionmentioning

confidence: 99%

Fetal electrocardiography: feasibility of long‐term fetal heart rate recordings

Graatsma

Jacod

Egmond

et al. 2008

BJOG

154

119

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The feasibility and accuracy of long-term transabdominal fetal electrocardiogram (fECG) recordings throughout pregnancy were studied using a portable fECG monitor. Fifteen-hour recordings of fetal heart rate (FHR) were performed in 150 pregnant women at 20-40 weeks of gestation and 1-hour recordings were performed in 22 women in labour and compared with simultaneous scalp electrode recordings. When ‡60% of fECG signals was present, the recording was defined as good. Eighty-two percent (123/150) of antenatal recordings were of good quality. This percentage increased to 90.7 (136/150 recordings) when only the night part (11 p.m.-7 a.m.) was considered. Transabdominal measurement of FHR and its variability correlated well with scalp electrode recordings (r = 0.99, P < 0.01; r = 0.79, P < 0.01, respectively). We demonstrated the feasibility and accuracy of long-term transabdominal fECG monitoring.

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“…Abdominal fetal electrocardiograin (aFECG) is used äs a trigger signal in the statistical analysis of intervals and the differences between them [7]. The indices of variability thus obtained have a good correlation with indices calculated simultaneously from direct FECG [6,12]. Interval index (II) describes the long-term variability and differential index (DI) the short-term variability in this analysis.…”

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confidence: 99%

Antepartal analysis of fetal heart rate variability by abdominal electrocardiography

Kariniemi¹,

Siimes²,

Ämmälä³

1982

Journal of Perinatal Medicine

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Antepartal analysis of fetal heart rate variability (FHRV) has been shown to be of value in predicting fetal distress in labor [8]. Abdominal fetal electrocardiograin (aFECG) is used äs a trigger signal in the statistical analysis of intervals and the differences between them [7]. The indices of variability thus obtained have a good correlation with indices calculated simultaneously from direct FECG [6,12]. Interval index (II) describes the long-term variability and differential index (DI) the short-term variability in this analysis. The main disadvantage of this analysis System is a fairly high failure rate of aFECG during the third trimester of pregnancy. Gestational age, the electrode position and the maternal position have been shown to affect the recordability of aFECG [l, 2, 3, 4, 9, 11]. On the other hand, maternal obesity, placental location and the state of the membranes have been shown not to have any effect on the quality of aFECG [l, 3, 9]. The aim of this study was to investigate how often FHRV analysis made by aFECG succeeds and what is the role of certain methodological factors in the recording procedure. Patients and methodsFHRV analyses were performed by a previously described method using an on-line microprocessor system [7]. The analysis was regarded äs a failure when less than 30% of the intervals detected were accepted in the analysis. Student's paired t-test (one-sided) was used to measure the significance of the results.2.2 Maternal position in FHRV analysis. The maternal supine vs. 90-degree lateral position was studied relating to the success rate and to the variability indices in 30 pregnancies. A five-minute analysis was fiist attempted in the supine position immediately followed by a 90-degree lateral position. The maternal supine and 15-degree lateral positions were similarly compared in 30 pregnancies.

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Quantification of fetal heart rate variability by abdominal electrocardiography

Abstract: Kariniemi et al., Quantification of FHR variability 27 j. Perinat. Med.Quantification of fetal heart rate variability by abdominal electro-7 (1979) 27 cardiography

Cited by 18 publications

References 3 publications

Technical note

Technical note

Fetal electrocardiography: feasibility of long‐term fetal heart rate recordings

Antepartal analysis of fetal heart rate variability by abdominal electrocardiography

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