Computerized analysis of fetal heart rate parameters by gestational age

Park, M.I; Hwang, Jai Hyun; Cha, Kwang-Yul; Park, Y.S; Koh, Seung-Kwon

doi:10.1016/s0020-7292(01)00423-4

Cited by 42 publications

(42 citation statements)

References 15 publications

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“…13 More recently, new studies have confirmed the increased frequency of accelerations after 32 weeks, as assessed by computerized cardiotocography, 14,15 confirming previous results and supporting the importance of these values once again to assess the proper development of the fetus.…”

Section: Discussionsupporting

confidence: 69%

Transient accelerations of fetal heart rate analyzed by computerized cardiotocography in the third trimester of pregnancy

Lauletta

Nomura

Miyadahira

et al. 2014

Rev. Assoc. Med. Bras.

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Objective: the aim of this study was to investigate the patterns of transient FHR accelerations (10 bpm and 15 bpm) in the third trimester of pregnancy, comparing the occurrence of this event before and after the 32nd gestational week. Methods: This is a prospective study comparing the results of the computerized cardiotocography of 46 low-risk women with singleton pregnancies, maternal age between 18 and 40 years, gestational age between 28 and 40 weeks, absence of maternal morbidity and adequate fetal growth according to ultrasound. Computed Cardiotocography (8002 Sonicaid System and Fetal Care System) was performed for 30 minutes to analyze the variables of FHR. Results: twenty-three pregnant women underwent cardiotocography before 32 weeks (mean = 29.9 weeks, SD = 1.4 weeks) and were compared with 23 pregnant women who were examined after 32 weeks (mean = 36.3 weeks, SD = 2.5 weeks). Regarding the characteristics of FHR, fetuses evaluated between 32 1/7 weeks and 40 weeks showed a significantly greater number of accelerations above 15 bpm (median = 5, variation 0-18) than the group of pregnant women from 28 to 32 weeks (median = 4, variation 0 to 10; P = 0.048). There was a significant positive correlation between the number of accelerations above 15 bpm and the gestational age at examination (rho = 0.33; P = 0.026). Conclusion: computerized cardiotocography showed an association regarding the number of transient accelerations greater than 15 bpm in the assessment of both periods before and after 32 weeks of gestational age, suggesting the influence of the maturation of the fetal autonomic nervous system with pregnancy progression.Uniterms: fetal heart rate, cardiotocography, gestational age.

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Section: Discussionsupporting

confidence: 69%

Transient accelerations of fetal heart rate analyzed by computerized cardiotocography in the third trimester of pregnancy

Lauletta

Nomura

Miyadahira

et al. 2014

Rev. Assoc. Med. Bras.

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“…FHR parameters were monitored using an external electronic FHR monitor using our computerized Hanyang Fetal Monitoring System (HYFM-II) [2,14] . All the subjects were in a semirecumbent position for a minimum of 10 min before data collection which occurred from 2 to 6 p.m. FHR time series were recorded for more than 40 min using the HYFM; external fetal movements (FMs) and breathing were included.…”

Section: Data Collection and Preprocessingmentioning

confidence: 99%

“…FMs were recorded simultaneously. All data were sent to a given unit, and the interval was calculated at an average of 100 ms, as previously described by Park et al [2] . After signal loss was excluded, all remaining data were measured to obtain an average value of the total within the observational window of 20 min.…”

Section: Fhr Parameters and Reactive Testsmentioning

confidence: 99%

“…Fetal heart rate (FHR) monitoring in the form of the non-stress test (NST) is an established part of obstetric practice [1][2][3] . According to FIGO guidelines [4] , absence of FHR accelerations is of uncertain significance, and one has to identify causes that may abolish accelerations such as hypoxia, infection, medication, brain hemorrhage, etc.…”

Section: Introductionmentioning

confidence: 99%

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Conventional Linear Criteria with Sample Entropy in the Interpretation of Reactive Antepartum Fetal Heart Rate Tracings

Park

Hoh²,

Koh³

et al. 2010

Fetal Diagn Ther

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Objective: To compare the test duration times and rate of nonreactive results between the conventional linear reactive criteria (CLRC) and the modified nonlinear reactive criteria (MNRC) in electronic fetal heart rate (FHR) monitoring. The MNRC are the CLRC with the addition of approximate entropy or sample entropy. Methods: One thousand women with singleton pregnancies between 30 and 37 weeks’ gestation were selected. They visited Hanyang University Hospital for non-stress tests (NSTs). In these patients, FHR tracings were recorded for 50 min including the first and second 20 min of NST and 10 min of vibroacoustic stimulation test. All patients had a reactive NST with CLRC in these antepartum FHR tests. The rate of nonreactive tests and test duration times of these linear and nonlinear criteria were calculated and compared. Results: The rate of nonreactive tests within a 20- and 40-min period with the MNRC (6.8 and 1.2%) was significantly lower than with the CLRC (35.2 and 10.5%, respectively; p < 0.001). To meet the reactive criteria, the mean durations of the MNRC and the CLRC were 11.47 (95% CI, 11.11–11.84) and 18.45 (95% CI, 17.79–19.12) min, respectively (p < 0.001). The MNRC led to a significant reduction in testing time of 37.8% compared to the CLRC. The rate of reactive tests using only sample entropy (0.20), calculated over 5-min segments of FHR tracings, was 88.3% (95% CI, 88.0–88.7). It was close to the results using the MNRC (93.2%) in the 20-min time window. Conclusion:The use of the MNRC significantly reduced the test duration times and decreased the rate of nonreactive tests when compared to the CLRC. It may be useful in providing more rapid and accurate assessment of the fetus in electronic FHR monitoring.

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“…Moreover, the major limitations are related to the few attempts to evaluate clinical implication of cCTG parameters as the absence of their analysis in relation with neonatal outcome. Most of the studies focussed on the predictive value of cCTG parameters considered only their relation with the Apgar score, not including other important parameters such as umbilical cord pH at birth (Bernardes et al 1997;Park et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Computerised analysis of antepartum foetal heart parameters: New reference ranges

Giuliano

Annunziata

Esposito

et al. 2016

Journal of Obstetrics and Gynaecology

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We selected 4012 cCTG records (one trace for each patient) performed in healthy pregnancies from 30th to 42nd gestational week using foetal heart rate (FHR), short-term variability (STV), long-term irregularity (LTI), Delta, approximate entropy (ApEn), spectral components as low frequency (LF), median frequency (MF), high frequency (HF) and LF/(HF þ MF) ratio were analysed. Reference nomograms were created and sensitivity and specificity for the prediction of foetal compromise were calculated which were 90% and 89%, respectively. Changes of cCTG parameters according to gestational week were evaluated: FHR (r ¼ À.65) and LF (r ¼ À.87) showed a statistically significant reduction (p < .05) with gestational age. STV (r ¼ .59), LTI (r ¼ .69), Delta (r ¼ .67), and MF (r ¼ .88) showed a statistically significant increase (p < .05) with gestational age. In contrast, for ApEn (r ¼ À.098), HF (r ¼ .14) and LF/(HF þ MF) ratio (r ¼ À.47) a non-statistically significant change was found (p > .05). The identification of reference ranges for cCTG indexes in according to gestational age could provide a more objective examination of cCTG trace.

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Computerized analysis of fetal heart rate parameters by gestational age

Abstract: The results showed that overall, the differences in the FHR parameters between gestational groups were statistically significant, and the gestational age of the fetus should be considered when interpreting FHR patterns.

Cited by 42 publications

References 15 publications

Transient accelerations of fetal heart rate analyzed by computerized cardiotocography in the third trimester of pregnancy

Transient accelerations of fetal heart rate analyzed by computerized cardiotocography in the third trimester of pregnancy

Conventional Linear Criteria with Sample Entropy in the Interpretation of Reactive Antepartum Fetal Heart Rate Tracings

Computerised analysis of antepartum foetal heart parameters: New reference ranges

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