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Estimating Fetal Gestational Age Using Cardiac Valve Intervals
2016
2016 Computing in Cardiology Conference (CinC)
unpublished
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A new automated method for estimation of the gestational age is presented in this paper based on the intervals between fetal cardiac valve timings and the Q-wave of fetal electrocardiogram (fECG). ...
Since valve intervals reflect the autonomic function, this method provides a novel measure of the development of fetal autonomic nervous system that may be growth curve independent. ...
Discussion and Conclusion In this paper a new GA estimator using fetal cardiac valve intervals is proposed. ...
doi:10.22489/cinc.2016.035-146
fatcat:lbiatv63bjbbjoxdyuwz7fldo4
Fetal Cardiac Timing Events Estimation From Doppler Ultrasound Signals Using Swarm Decomposition
2019
Frontiers in Physiology
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differing age groups) which can later be used to estimate fetal cardiac intervals from a DUS signal. ...
Pulsed Doppler images are used in order to verify the estimated timings. Three fetal age groups were assessed in terms of their cardiac intervals: 16-29, 30-35, and 36-41 weeks. ...
ACKNOWLEDGMENTS We would like to thank the clinical support service team at the Tohoku University in Japan for the fetal Doppler data recordings. ...
doi:10.3389/fphys.2019.00789
pmid:31281265
pmcid:PMC6597894
fatcat:kifzpfqekvctbjigkelcwtwb4m
Gestation-specific reference intervals for fetal cardiac Doppler indices from 12 to 40 weeks of gestation
2013
Open Journal of Obstetrics and Gynecology
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We aimed to establish gestation age specific reference intervals for Doppler indices of fetal cardiac function from 12 to 40 weeks of pregnancy. ...
Establishing gestation age specific ranges for various cardiac indices throughout pregnancy will help the study of development of fetal cardiac function. ...
We estimated the gestational mean of a fetal Doppler measurement using a cubic polynomial in gestational age. ...
doi:10.4236/ojog.2013.31019
fatcat:f5f6ekhot5h4rar3475vhhnjdm
Development of Fetal Cardiac Intervals Throughout 16 to 41 Weeks of Gestation
2013
International Conference on Computing in Cardiology
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This method provides automated beat by beat identification of cardiac valves' opening and closing which are used to estimate the fetal cardiac intervals. ...
In this paper a new noninvasive method is proposed for automated estimation of fetal cardiac intervals from Doppler Ultrasound (DUS) signal and fetal electrocardiogram (fECG) as a reference. ...
The cardiac intervals were estimated based on the fetal valve motions and they were found to be changing with the development of the fetus from early to late gestation. ...
dblp:conf/cinc/MarzbanradKFSEI13
fatcat:23bgpter55g5binfoofpdvgcka
Assessment of Fetal Development Using Cardiac Valve Intervals
2017
Frontiers in Physiology
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This hypothesis was evaluated by modeling the fetal development using the cardiac intervals and validating against the gold standard gestational age identified by Crown-Rump Length (CRL). ...
These intervals were estimated automatically from one-dimensional Doppler Ultrasound and noninvasive fECG. We hypothesize that the fetal growth can be estimated by the cardiac valve intervals. ...
The authors would also like to thank the clinical support service team at Tohoku University for providing the fetal Doppler and fECG data. ...
doi:10.3389/fphys.2017.00313
pmid:28567021
pmcid:PMC5434138
fatcat:rm7igvwohnegta4mkklea26itm
Identification of Fetal Cardiac Timing Events by Swarm Decomposition of Doppler Cardiogram Signal
2018
2018 Computing in Cardiology Conference (CinC)
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In the early gestational age, the time intervals from R peak of fetal ECG to opening and closing of aortic valve were found to be 59.4±1.9 ms and 218.8±2.4 ms respectively and in the late gestational age ...
Doppler ultrasound signals (DUS), which is commonly used for monitoring the fetal heart rate, can also be used for identifying the event timing of fetal cardiac valve motions. ...
Also the authors would like to thank the clinical support service team at Tohoku University in Japan for fetal Doppler data recordings. ...
doi:10.22489/cinc.2018.310
dblp:conf/cinc/AlnuaimiJKAHK18
fatcat:44iyai6esbawvhcntb67e5kczi
Heart stroke volume and cardiac output by four-dimensional ultrasound in normal fetuses
2008
Ultrasound in Obstetrics and Gynecology
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Objective To establish reference intervals for fetal heart stroke volume and cardiac output with gestation. ...
Conclusions In normal fetuses the stroke volume and cardiac output increase between 12 and 34 weeks' gestation. ...
ACKNOWLEDGMENT This study was supported by a grant from The Fetal Medicine Foundation (Charity No: 1037116). ...
doi:10.1002/uog.5374
pmid:18634132
fatcat:uoxxrd5tuvbg7iirf36ftqhx4q
Fetal Hemodynamic Adaptive Changes Related to Intrauterine Growth: The Generation R Study
2008
Circulation
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The fetal circulation was examined in relation to estimated fetal weight. Higher placental resistance indices were strongly associated with decreased fetal growth. ...
Cardiac remodeling and cardiac output changes are consistent with a gradual increase in afterload and compromised arterial compliance in conditions of decreased fetal growth. ...
B, Mean cardiac performance measurements at the level of the atrioventricular valves with estimated fetal weight ranging from small (group 1) to large (group 10) for gestational age. tion to a higher afterload ...
doi:10.1161/circulationaha.107.709717
pmid:18212281
fatcat:6ffcwbxnvneqlb66fjy7bvdrqa
Fetal Cardiac Doppler Signal Processing Techniques: Challenges and Future Research Directions
2017
Frontiers in Bioengineering and Biotechnology
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The fetal cardiac intervals, which can be estimated by measuring the fetal cardiac event timings, are the most important markers of fetal development and well-being. ...
The fetal Doppler Ultrasound (DUS) is commonly used for monitoring fetal heart rate and can also be used for identifying the event timings of fetal cardiac valve motions. ...
The technique was used to analyze the changes in the fetal cardiac intervals for three fetal age groups: 16-29, 30-35, and 36-41 weeks. ...
doi:10.3389/fbioe.2017.00082
pmid:29312932
pmcid:PMC5743703
fatcat:xcwnnrseerbbthu7x4x3gjl2aq
Cardiac function in fetuses with intracardiac echogenic foci
2001
Ultrasound in Obstetrics and Gynecology
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Twodimensional and M-mode directed fetal echocardiography were used to exclude cardiac anomalies and measure right and left ventricular free walls and interventricular septal thickness and ventricular ...
In the mitral valve the ratio was 0.37 ± 0.14 (0.039) (mean ± SD (95% confidence interval for difference between the means) ) vs. 0.59 ± 0.19 (0.052) and in the tricuspid valve it was 0.42 ± 0. 16 (0.045 ...
Two-dimensional fetal echocardiography was used to exclude a structural cardiac anomaly. ...
doi:10.1046/j.1469-0705.2001.00433.x
pmid:11529992
fatcat:3vmmwrzegfbtznpw7qdpmktdsm
Nomograms of Fetal Cardiac Dimensions at 18–41 Weeks of Gestation
2019
Fetal Diagnosis and Therapy
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Parametric regressions were tested to model each measurement against gestational age from 18 to 41 weeks of gestation. ...
The objective of the present study was to construct nomograms for fetal cardiac dimensions using a well-defined echocardiographic methodology in a low-risk population. ...
Interobserver reproductibility was estimated in 45 cases (15 cases per 162 gestational age in the following intervals: 18-25; 26-33 and 34-41 weeks of gestational 163 age). ...
doi:10.1159/000494838
pmid:30612128
fatcat:nr76zv3nyzd5fdmttx7m62wxsy
Assessment of Left Ventricular Pre-Ejection Period in the Fetus Using Simultaneous Magnetocardiography and Echocardiography
2010
Fetal Diagnosis and Therapy
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Valve clicks, therefore, may provide more precise estimates of mechanical, as well as electromechanical, intervals. ...
RR (ms). c QRS (ms) vs. gestational age (weeks). d RR (ms) vs. gestational age (weeks) in 41 sessions of normal human fetuses. ...
doi:10.1159/000318345
pmid:20975278
pmcid:PMC2992646
fatcat:mqtvupgj5rdexn2tkdqq7iwdli
Reference values for variables of fetal cardiocirculatory dynamics at 11-14 weeks of gestation
2010
Ultrasound in Obstetrics and Gynecology
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Global cardiac function was evaluated using the heart : chest area ratio and Tei index of the left (LV) and right (RV) ventricles. ...
The parameters of normal cardiac function at 11-14 weeks' gestation are not well defined and appropriate reference values have not yet been established. ...
Valve clicks were used to identify the closure and opening of the atrioventricular and semilunar valves while measuring the time intervals 18 . ...
doi:10.1002/uog.7595
pmid:20178107
fatcat:hq7qa7lv5nhr3bp2mxi7owm32y
Evolução e prognóstico materno-fetal da cirurgia cardíaca durante a gravidez
2009
Arquivos Brasileiros de Cardiologia
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Fetal cardiotocography was performed throughout the procedure in patients with gestational age above 20 weeks. ...
Results: Mean maternal age was 27.8 ± 7.6 years; there was a predominance of patients with rheumatic valve disease (87.8%), of whom 5 (4.6%) underwent reoperation due to prosthetic valve dysfunction. ...
arrhythmia; 2 -Odds ratio estimate; 3 -Confidence interval obtained using the Wolf method; 4 -Fetal loss, stillbirth and neonatal death. ...
doi:10.1590/s0066-782x2009000700003
pmid:19838464
fatcat:iseu7k7tofe3degcselk7tiscq
Time interval analysis of ductus venosus and cardiac cycles in relation with umbilical artery pH at birth in fetal growth restriction
2021
BMC Pregnancy and Childbirth
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FGR was defined as an estimated fetal weight below − 2.0 S.D. with an elevated UA-PI. ...
Background The aims of this study were to evaluate the time intervals of flow velocity waveforms (FVW) of ductus venosus (DV) and cardiac cycles, as well as the pulsatility index of DV-FVW (DV-PI), in ...
The last menstrual period was applied for the calculation of gestational age and the measurement of a crown-rump length at 9-11 weeks' gestation was used for confirmation of gestational age. ...
doi:10.1186/s12884-021-04115-7
pmid:34602049
fatcat:dt5n6mf6t5aalgbxfr7n33doem
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