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Vonzun L, Ochsenbein-Kölble N, Balsyte D, Zimmermann R, Gonser M. Second systolic peak in fetal middle cerebral artery Doppler after intrauterine transfusion. Arch Gynecol Obstet 2023; 307:241-248. [PMID: 35348831 PMCID: PMC9837016 DOI: 10.1007/s00404-022-06517-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 03/08/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To evaluate functional relationship between fetal circulatory response to intrauterine transfusion (IUT) as a circulatory challenge and appearance of second systolic peak (P2) in middle cerebral artery (MCA) based on hemodynamic principles. METHODS According to the concept of pulse wave (PW) propagation and reflection in adults, PWs arrive twice at cerebral circulation, as primary wave caused by left ventricle ejection and secondary after reflection in peripheral arteries. Thus adults show a biphasic contour of systolic blood flow in cerebral arteries. Similar waveforms may appear in fetal MCA-Doppler, as a response to IUT as a circulatory challenge. This is a proof-of-principle study, applying classical hemodynamic principles to fetal circulation. Accordingly, appearance of MCA-P2 may indicate vasoconstriction with increased PW reflection and timing of P2(Δt) should agree with the additional PW travel time down to reflection and return (Tr). To test this agreement, we searched our database for IUTs performed for severe fetal anemia, and compared Δt, obtained by Doppler, with Tr, obtained by hemodynamic calculation using human fetal data. Level of agreement was assessed using Bland-Altman-Plots. RESULTS We identified 21 fetuses with adequate Doppler quality for Δt evaluation. In four cases (19%) MCA-P2 was observed before the intervention, and in 17 interventions (81%) thereafter; a highly significant association between IUT and P2 appearance (p < 0.001). In these 17 interventions good agreement of P2 timing was found between Doppler assessment: Δt = 80 ± 8 ms, and hemodynamic calculation: Tr = 76 ± 4 ms. CONCLUSION P2 appearance in fetal MCA-Doppler seems to indicate PW reflection due to increased vasoconstriction after IUT. Thus hemodynamic considerations might enable Doppler monitoring of fetal vasoconstriction.
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Affiliation(s)
- Ladina Vonzun
- Department of Obstetrics, University Hospital Zurich, Frauenklinikstrasse 10, 8006, Zurich, Switzerland.
- University of Zurich, Zurich, Switzerland.
| | - Nicole Ochsenbein-Kölble
- Department of Obstetrics, University Hospital Zurich, Frauenklinikstrasse 10, 8006, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Dalia Balsyte
- Department of Obstetrics, University Hospital Zurich, Frauenklinikstrasse 10, 8006, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Roland Zimmermann
- Department of Obstetrics, University Hospital Zurich, Frauenklinikstrasse 10, 8006, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Markus Gonser
- Department of Obstetrics and Prenatal Medicine, Helios-HSK Kliniken Wiesbaden, Wiesbaden, Germany
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van Willigen BG, van der Hout-van der Jagt MB, Huberts W, van de Vosse FN. A review study of fetal circulatory models to develop a digital twin of a fetus in a perinatal life support system. Front Pediatr 2022; 10:915846. [PMID: 36210952 PMCID: PMC9532745 DOI: 10.3389/fped.2022.915846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 08/16/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Preterm birth is the main cause of neonatal deaths with increasing mortality and morbidity rates with decreasing GA at time of birth. Currently, premature infants are treated in neonatal intensive care units to support further development. However, the organs of, especially, extremely premature infants (born before 28 weeks of GA) are not mature enough to function optimally outside the womb. This is seen as the main cause of the high morbidity and mortality rates in this group. A liquid-filled incubator, a so-called PLS system, could potentially improve these numbers for extremely premature infants, since this system is designed to mimic the environment of the natural womb. To support the development and implementation of such a complex system and to interpret vital signals of the fetus during a PLS system operation, a digital twin is proposed. This mathematical model is connected with a manikin representing the digital and physical twin of the real-life PLS system. Before developing a digital twin of a fetus in a PLS system, its functional and technical requirements are defined and existing mathematical models are evaluated. METHOD AND RESULTS This review summarizes existing 0D and 1D fetal circulatory models that potentially could be (partly) adopted for integration in a digital twin of a fetus in a PLS system based on predefined requirements. The 0D models typically describe hemodynamics and/or oxygen transport during specific events, such as the transition from fetus to neonate. Furthermore, these models can be used to find hemodynamic differences between healthy and pathological physiological states. Rather than giving a global description of an entire cardiovascular system, some studies focus on specific organs or vessels. In order to analyze pressure and flow wave profiles in the cardiovascular system, transmission line or 1D models are used. As for now, these models do not include oxygen transport. CONCLUSION This study shows that none of the models identified in literature meet all the requirements relevant for a digital twin of a fetus in a PLS system. Nevertheless, it does show the potential to develop this digital twin by integrating (parts) of models into a single model.
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Affiliation(s)
- Bettine G van Willigen
- Cardiovascular Biomechanics, Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands.,Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, Netherlands
| | - M Beatrijs van der Hout-van der Jagt
- Cardiovascular Biomechanics, Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands.,Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, Netherlands.,Signal Processing Systems, Electrical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
| | - Wouter Huberts
- Cardiovascular Biomechanics, Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands.,Department of Biomedical Engineering, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, Netherlands
| | - Frans N van de Vosse
- Cardiovascular Biomechanics, Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
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3
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Gonser M, Vonzun L, Ochsenbein-Kölble N. Ophthalmic artery Doppler in prediction of pre-eclampsia: insights from hemodynamic considerations. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2021; 58:145-147. [PMID: 34028931 DOI: 10.1002/uog.23665] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Affiliation(s)
- M Gonser
- Department of Obstetrics and Prenatal Medicine, Helios-HSK Kliniken Wiesbaden, Wiesbaden, Germany
| | - L Vonzun
- Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - N Ochsenbein-Kölble
- Department of Obstetrics, University Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
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4
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Pahlevan NM, Mazandarani SP. Estimation of Wave Condition Number From Pressure Waveform Alone and Its Changes With Advancing Age in Healthy Women and Men. Front Physiol 2020; 11:313. [PMID: 32328003 PMCID: PMC7161432 DOI: 10.3389/fphys.2020.00313] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 03/19/2020] [Indexed: 11/13/2022] Open
Abstract
Introduction The wave condition number (WCN) is a non-dimensional number that determines the state of arterial wave reflections. WCN is equal to HR × Leff/PWV where HR, Leff, and PWV are the heart rate, effective length, and pulse wave velocity, respectively. It has been shown that a value of WCN = 0.1 indicates the optimum state of arterial wave reflection in which left ventricle workload is minimized. The pressure wave, flow wave, and PWV are all required to compute WCN, which may limit the potential clinical utility of WCN. The aims of this study are as follows: (1) to assess the feasibility of approximating WCN from the pressure waveform alone (WCNPinf), and (2) to provide the proof-of-concept that WCNPinf can capture age related differences in arterial wave reflection among healthy women and men. Methods Previously published retrospective data composed of seventeen patients (age 19–54 years; 34.3 ± 9.6) were used to assess the accuracy of WCNPinf. The exact value of WCN was computed from PWV (measured by foot-to-foot method), HR, and Leff. A quarter wavelength relationship with minimum impedance modulus were used to compute Leff. WCNPinf was calculated using HR and the reflected wave arrival time. Previously published analyses from a healthy subset of the Anglo-Cardiff Collaborative Trial (ACCT) study population were used to investigate if non-invasive WCNPinf captures age related differences in arterial wave reflection among healthy women and men. Results A strong correlation (r = 0.83, p-value <0.0001) between WCNPinf and WCN was observed. The accuracy of WCNPinf was independent from relevant physiological parameters such as PWV, pulse pressure (PP), and HR. Similar changes in WCNPinf with advancing age were observed in both healthy men and healthy women. In young, healthy individuals (women and men) the WCNPinf was around 0.1 (the optimum value), and reduced with aging. Conclusion WCN can be approximated from a single pressure waveform and can capture age related arterial wave reflection alteration. These results are clinically significant since WCN can be extracted from a single non-invasive pressure waveform. Future studies will focus on investigating if WCN is associated with risk for onset of cardiovascular disease events.
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Affiliation(s)
- Niema M Pahlevan
- Department of Aerospace Mechanical Engineering, University of Southern California, Los Angeles, CA, United States.,Division of Cardiovascular Medicine, Department of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Sohrab P Mazandarani
- Department of Economics, Geography, and Political Science, Division of Language, Humanity, and Social Science, Riverside City College, Riverside, CA, United States
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5
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Yigit B, Tutsak E, Yıldırım C, Hutchon D, Pekkan K. Transitional fetal hemodynamics and gas exchange in premature postpartum adaptation: immediate vs. delayed cord clamping. Matern Health Neonatol Perinatol 2019; 5:5. [PMID: 31011431 PMCID: PMC6460527 DOI: 10.1186/s40748-019-0100-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 03/14/2019] [Indexed: 11/10/2022] Open
Abstract
Background Recent studies suggest that delayed cord clamping (DCC) is advantageous for achieving hemodynamic stability and improving oxygenation compared to the immediate cord clamping (ICC) during fetal-to-neonatal transition yet there is no quantitative information on hemodynamics and respiration, particularly for pre-term babies and fetal disease states. Therefore, the objective of this study is to investigate the effects of ICC and DCC on hemodynamics and respiration of the newborn preterm infants in the presence of common vascular pathologies. Methods A computational lumped parameter model (LPM) of the placental and respiratory system of a fetus is developed to predict blood pressure, flow rates and oxygen saturation. Cardiovascular system at different gestational ages (GA) are modeled using scaling relations governing fetal growth with the LPM. Intrauterine growth restriction (GR), patent ductus arteriosus (PDA) and respiratory distress syndrome (RDS) were modeled for a newborn at 30 weeks GA. We also formulated a "severity index (SI)" which is a weighted measure of ICC vs. DCC based on the functional parameters derived from our model and existing neonatal disease scoring systems. Results Our results show that transitional hemodynamics is smoother in DCC compared to ICC for all GAs. Blood volume of the neonate increases by 10% for moderately preterm and term infants (32-40 wks) and by 15% for very and extremely preterm infants (22-30 wks) with DCC compared to ICC. DCC also improves the cardiac output and the arterial blood pressure by 17% in term (36-40 wks), by 18% in moderately preterm (32-36 wks), by 21% in very preterm (28-32 wks) and by 24% in extremely preterm (20-28 wks) births compared to the ICC. A decline in oxygen saturation is observed in ICC received infants by 20% compared to the DCC received ones. At 30 weeks GA, SI were calculated for healthy newborns (1.18), and newborns with GR (1.38), PDA (1.22) and RDS (1.2) templates. Conclusion Our results suggest that DCC provides superior hemodynamics and respiration at birth compared to ICC. This information will help preventing the complications associated with poor oxygenation arising in premature births and pre-screening the more critical babies in terms of their cardiovascular severity.
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Affiliation(s)
- Berk Yigit
- 1Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA USA
| | - Ece Tutsak
- 2Department of Biomedical Engineering, Politecnico di Milano, Milan, Italy
| | - Canberk Yıldırım
- 3Department of Mechanical Engineering, Boğaziçi University, Istanbul, Turkey
| | - David Hutchon
- 4Emeritus Consultant Obstetrician, Memorial Hospital, Darlington, UK
| | - Kerem Pekkan
- 5Department of Mechanical Engineering, Koç Univeresity, Istanbul, Turkey
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6
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Chao PCP, Chiang PY, Kao YH, Tu TY, Yang CY, Tarng DC, Wey CL. A Portable, Wireless Photoplethysomography Sensor for Assessing Health of Arteriovenous Fistula Using Class-Weighted Support Vector Machine. SENSORS 2018; 18:s18113854. [PMID: 30423988 PMCID: PMC6263509 DOI: 10.3390/s18113854] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/28/2018] [Accepted: 11/06/2018] [Indexed: 12/28/2022]
Abstract
A portable, wireless photoplethysomography (PPG) sensor for assessing arteriovenous fistula (AVF) by using class-weighted support vector machines (SVM) was presented in this study. Nowadays, in hospital, AVF are assessed by ultrasound Doppler machines, which are bulky, expensive, complicated-to-operate, and time-consuming. In this study, new PPG sensors were proposed and developed successfully to provide portable and inexpensive solutions for AVF assessments. To develop the sensor, at first, by combining the dimensionless number analysis and the optical Beer Lambert’s law, five input features were derived for the SVM classifier. In the next step, to increase the signal-noise ratio (SNR) of PPG signals, the front-end readout circuitries were designed to fully use the dynamic range of analog-digital converter (ADC) by controlling the circuitries gain and the light intensity of light emitted diode (LED). Digital signal processing algorithms were proposed next to check and fix signal anomalies. Finally, the class-weighted SVM classifiers employed five different kernel functions to assess AVF quality. The assessment results were provided to doctors for diagonosis and detemining ensuing proper treatments. The experimental results showed that the proposed PPG sensors successfully achieved an accuracy of 89.11% in assessing health of AVF and with a type II error of only 9.59%.
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Affiliation(s)
- Paul C-P Chao
- Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - Pei-Yu Chiang
- Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - Yung-Hua Kao
- Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - Tse-Yi Tu
- Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - Chih-Yu Yang
- Division of Nephrology in Taipei Veterans General Hospital, Taipei 112, Taiwan.
| | - Der-Cherng Tarng
- Division of Nephrology in Taipei Veterans General Hospital, Taipei 112, Taiwan.
| | - Chin-Long Wey
- Institute of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
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7
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Piskin S, Altin HF, Yildiz O, Bakir I, Pekkan K. Hemodynamics of patient-specific aorta-pulmonary shunt configurations. J Biomech 2016; 50:166-171. [PMID: 27866675 DOI: 10.1016/j.jbiomech.2016.11.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Accepted: 11/02/2016] [Indexed: 10/20/2022]
Abstract
Optimal hemodynamics in aorta-pulmonary shunt reconstruction is essential for improved post-operative recovery of the newborn congenital heart disease patient. However, prior to in vivo execution, the prediction of post-operative hemodynamics is extremely challenging due to the interplay of multiple confounding physiological factors. It is hypothesized that the post-operative performance of the surgical shunt can be predicted through computational blood flow simulations that consider patient size, shunt configuration, cardiac output and the complex three-dimensional disease anatomy. Utilizing only the routine patient-specific pre-surgery clinical data sets, we demonstrated an intelligent decision-making process for a real patient having pulmonary artery atresia and ventricular septal defect. For this patient, a total of 12 customized candidate shunt configurations are contemplated and reconstructed virtually using a sketch-based computer-aided anatomical editing tool. Candidate shunt configurations are evaluated based on the parameters that are computed from the flow simulations, which include 3D flow complexity, outlet flow splits, shunt patency, coronary perfusion and energy loss. Our results showed that the modified Blalock-Taussig (mBT) shunt has 12% higher right pulmonary artery (RPA) and 40% lower left pulmonary artery (LPA) flow compared to the central shunt configuration. Also, the RPA flow regime is distinct from the LPA, creating an uneven flow split at the pulmonary arteries. For all three shunt sizes, right mBT innominate and central configurations cause higher pulmonary artery (PA) flow and lower coronary artery pressure than right and left mBT subclavian configurations. While there is a trade-off between energy loss, flow split and coronary artery pressure, overall, the mBT shunts provide sufficient PA perfusion with higher coronary artery pressures and could be preferred for similar patients having PA overflow risk. Central shunts would be preferred otherwise particularly for cases with very low PA overflow risk.
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Affiliation(s)
- Senol Piskin
- Department of Biomedical Engineering, Koc University, Istanbul, Turkey
| | - H Firat Altin
- Istanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training & Research Hospital, Istanbul, Turkey
| | - Okan Yildiz
- Istanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training & Research Hospital, Istanbul, Turkey
| | - Ihsan Bakir
- Istanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training & Research Hospital, Istanbul, Turkey
| | - Kerem Pekkan
- Department of Biomedical Engineering, Koc University, Istanbul, Turkey; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, USA.
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