scholarly journals Atrioventricular Conduction Time in Fetuses Assessed by Doppler Echocardiography

2011 ◽  
pp. 611-616 ◽  
Author(s):  
V. TOMEK ◽  
J. JANOUŠEK ◽  
O. REICH ◽  
J. GILÍK ◽  
R. A. GEBAUER ◽  
...  
Keyword(s):  
Heart Rate ◽  
Reference Values ◽  
Gestational Age ◽  
Doppler Echocardiography ◽  
Fetal Heart ◽  
Atrioventricular Conduction ◽  
Time Interval ◽  
Conduction Time ◽  
Time Intervals ◽  
Normal Limits

We performed measurement of mechanical atrioventricular conduction time intervals in human fetuses assessed by Doppler echocardiography and provided reference values. We found that atrioventricular conduction time interval was prolonged with gestational age and decreased with increasing fetal heart rate. No correlation between gestational age and heart rate was found. Using normal limits established by this study, mechanical atrioventricular interval >135 ms in the 20th week and/or >145 ms in the 26th week of gestation could be suspected of having the first-degree AV block. We compared reference values with fetuses of mothers with anti-SSA Ro/SSB La autoantibodies, being in risk of isolated congenital heart block development. One of 21 fetuses of mothers with positive autoantibodies was affected by prolonged atrioventricular interval according to the established limits, with sinus rhythm after the birth.

Validation of a new algorithm for the short-term variation of the fetal heart rate: an antepartum prospective study

2018 ◽  
Vol 46 (6) ◽  
pp. 599-604 ◽  
Author(s):  
Christina Kouskouti ◽  
Hella Jonas ◽  
Kerstin Regner ◽  
Pia Ruisinger ◽  
Julia Knabl ◽  
...  
Keyword(s):  
Heart Rate ◽  
Reference Values ◽  
Fetal Heart Rate ◽  
Fetal Heart ◽  
Normal Values ◽  
Short Term ◽  
Mean Values ◽  
Relevant Reference ◽  
Term Variation ◽  
The Mean

Abstract Aims: Currently one of the most widespread systems for the computerized analysis of the fetal heart rate (FHR) is the Dawes-Redman system, where the short-term variation (STV) of the FHR is measured by dividing each minute into 16 segments (STV16). Technical progress has allowed for the development of a new algorithm, which measures the STV by dividing each minute into 240 segments (STV240), thus approximating the beat-to-beat variation. The STV240 still lacks reference values. Our aim was to develop clinically relevant reference values for the STV240 and compare them to the ones for the STV16. Methods: In a single centre, observational study, a total of 228 cardiotocograms were registered and subsequently analyzed with both algorithms (STV240 and STV16). Results: The 95% confidence interval (CI) was calculated for both algorithms. The values of the STV240 were significantly lower in comparison to the ones of the STV16. Not only the mean values but also the 95th percentile of the STV240 lay beneath the existent cut-off value for the STV16. Conclusions: Every clinician using the new algorithm must be aware that the normal values for the STV240 lie beneath the, up until now, established cut-off values for the STV16.

scholarly journals 364: Fetal atrioventricular and ventriculoatrial time intervals depend on gestational age, fetal weight and heart rate

2017 ◽  
Vol 216 (1) ◽  
pp. S220-S221
Author(s):  
Beatrice Mosimann ◽  
Sofia Amylidi-Mohr ◽  
Daniel Surbek ◽  
Luigi Raio
Keyword(s):  
Heart Rate ◽  
Gestational Age ◽  
Fetal Weight ◽  
Time Intervals

Computerized analysis of fetal heart rate parameters by gestational age

2001 ◽  
Vol 74 (2) ◽  
pp. 157-164 ◽  
Author(s):  
M.I Park ◽  
J.H Hwang ◽  
K.J Cha ◽  
Y.S Park ◽  
S.K Koh
Keyword(s):  
Heart Rate ◽  
Gestational Age ◽  
Fetal Heart Rate ◽  
Fetal Heart ◽  
Computerized Analysis

scholarly journals VARIABILITY OF ARTERIAL PRESSURE AT SHORT-TERM TIME INTERVALS

2019 ◽  
pp. 72-77
Author(s):  
S. M. Zakharov
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Analysis ◽  
Arterial Pressure ◽  
Real Time ◽  
Time Interval ◽  
Short Term ◽  
Time Intervals ◽  
Short Time

The time and spectral analysis of blood pressure signals (BP of systolic, diastolic, pulse) obtained in real time and reflecting the work of the heart at short time intervals is presented. As a time interval, a sequence of one hundred cardiac cycles was chosen. The main parameters of variability are determined. The proposed method of analysis is an analogue of heart rate variability (HRV), based on the study of RR cardiointervals. Spectral analysis of blood pressure signals shows differences in the degree of orderliness or disorder of individual frequencies or the spectrum as a whole. The presented methodology will allow to reveal further features for use in the diagnosis of various pathologies.

scholarly journals The pattern of variations in the first trimester fetal heart rate in Indian population: a pilot study

2019 ◽  
Vol 8 (11) ◽  
pp. 4419
Author(s):  
Hethyshi R.
Keyword(s):  
Heart Rate ◽  
Gestational Age ◽  
Fetal Heart Rate ◽  
Fetal Heart ◽  
First Trimester ◽  
Embryonic Heart ◽  
Large Sample Size ◽  
Crown Rump Length ◽  
Heart Rates ◽  
South Indian

Background: Fetal heart rate is an indicator of fetal viability. During third trimester and labour the normal range of fetal heart rate is between 110-160 bpm as recommended by the international guidelines. Unlike this, the first trimester embryonic heart rate does not lie in the same range. During the first trimester the normal embryonic heart rate varies between each week of gestation, as determined by a few western studies. Indian studies on the same are not available. Objective of this study was to determine the trend of the fetal heart rate in first trimester of pregnancy in South Indian women.Methods: Transvaginal scan was done in 51 pregnant women with singleton pregnancy attending the antenatal clinic in a medical college hospital. Crown rump length and fetal heart rate were measured and plotted on a graph. Also, the fetal heart rate at different gestational age of our study was compared with the fetal heart rates at the same gestational age from the studies in the western population.Results: The range of fetal heart rate at different weeks of gestation was comparable to the heart rate variations as seen in the western population. The maximum heart rates at 9 weeks of gestation in our study was higher than the heart rate in the western population.Conclusions: Possibility of variation in the fetal heart rates in the first trimester in different populations cannot be ruled out until confirmed by studies with large sample size.

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