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Korte J, Klopp ES, Berg P. Multi-Dimensional Modeling of Cerebral Hemodynamics: A Systematic Review. Bioengineering (Basel) 2024; 11:72. [PMID: 38247949 PMCID: PMC10813503 DOI: 10.3390/bioengineering11010072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 12/23/2023] [Accepted: 01/06/2024] [Indexed: 01/23/2024] Open
Abstract
The Circle of Willis (CoW) describes the arterial system in the human brain enabling the neurovascular blood supply. Neurovascular diseases like intracranial aneurysms (IAs) can occur within the CoW and carry the risk of rupture, which can lead to subarachnoid hemorrhage. The assessment of hemodynamic information in these pathologies is crucial for their understanding regarding detection, diagnosis and treatment. Multi-dimensional in silico approaches exist to evaluate these hemodynamics based on patient-specific input data. The approaches comprise low-scale (zero-dimensional, one-dimensional) and high-scale (three-dimensional) models as well as multi-scale coupled models. The input data can be derived from medical imaging, numerical models, literature-based assumptions or from measurements within healthy subjects. Thus, the most realistic description of neurovascular hemodynamics is still controversial. Within this systematic review, first, the models of the three scales (0D, 1D, 3D) and second, the multi-scale models, which are coupled versions of the three scales, were discussed. Current best practices in describing neurovascular hemodynamics most realistically and their clinical applicablility were elucidated. The performance of 3D simulation entails high computational expenses, which could be reduced by analyzing solely the region of interest in detail. Medical imaging to establish patient-specific boundary conditions is usually rare, and thus, lower dimensional models provide a realistic mimicking of the surrounding hemodynamics. Multi-scale coupling, however, is computationally expensive as well, especially when taking all dimensions into account. In conclusion, the 0D-1D-3D multi-scale approach provides the most realistic outcome; nevertheless, it is least applicable. A 1D-3D multi-scale model can be considered regarding a beneficial trade-off between realistic results and applicable performance.
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Affiliation(s)
- Jana Korte
- Research Campus STIMULATE, University of Magdeburg, 39106 Magdeburg, Germany
- Department of Fluid Dynamics and Technical Flows, University of Magdeburg, 39106 Magdeburg, Germany
| | - Ehlar Sophie Klopp
- Research Campus STIMULATE, University of Magdeburg, 39106 Magdeburg, Germany
- Department of Medical Engineering, University of Magdeburg, 39106 Magdeburg, Germany
| | - Philipp Berg
- Research Campus STIMULATE, University of Magdeburg, 39106 Magdeburg, Germany
- Department of Medical Engineering, University of Magdeburg, 39106 Magdeburg, Germany
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Rezaeimoghaddam M, Oguz GN, Ates MS, Bozkaya TA, Piskin S, Samaneh Lashkarinia S, Tenekecioglu E, Karagoz H, Pekkan K. Patient-Specific Hemodynamics of New Coronary Artery Bypass Configurations. Cardiovasc Eng Technol 2020; 11:663-678. [PMID: 33051831 DOI: 10.1007/s13239-020-00493-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 10/01/2020] [Indexed: 11/25/2022]
Abstract
PURPOSE This study aims to quantify the patient-specific hemodynamics of complex conduit routing configurations of coronary artery bypass grafting (CABG) operation which are specifically suitable for off-pump surgeries. Coronary perfusion efficacy and local hemodynamics of multiple left internal mammary artery (LIMA) with sequential and end-to-side anastomosis are investigated. Using a full anatomical model comprised of aortic arch and coronary artery branches the optimum perfusion configuration in multi-vessel coronary artery stenosis is desired. METHODOLOGY Two clinically relevant CABG configurations are created using a virtual surgical planning tool where for each configuration set, the stenosis level, anastomosis distance and angle were varied. A non-Newtonian computational fluid dynamics solver in OpenFOAM incorporated with resistance boundary conditions representing the coronary perfusion physiology was developed. The numerical accuracy is verified and results agreed well with a validated commercial cardiovascular flow solver and experiments. For segmental performance analysis, new coronary perfusion indices to quantify deviation from the healthy scenario were introduced. RESULTS The first simulation configuration set;-a CABG targeting two stenos sites on the left anterior descending artery (LAD), the LIMA graft was capable of 31 mL/min blood supply for all the parametric cases and uphold the healthy LAD perfusion in agreement with the clinical experience. In the second end-to-side anastomosed graft configuration set;-the radial artery graft anastomosed to LIMA, a maximum of 64 mL/min flow rate in LIMA was observed. However, except LAD, the obtuse marginal (OM) and second marginal artery (m2) suffered poor perfusion. In the first set, average wall shear stress (WSS) were in the range of 4 to 35 dyns/cm2 for in LAD. Nevertheless, for second configuration sets the WSS values were higher as the LIMA could not supply enough blood to OM and m2. CONCLUSION The virtual surgical configurations have the potential to improve the quality of operation by providing quantitative surgical insight. The degree of stenosis is a critical factor in terms of coronary perfusion and WSS. The sequential anastomosis can be done safely if the anastomosis angle is less than 90 degrees regardless of degree of stenosis. The smaller proposed perfusion index value, O(0.04 - 0) × 102, enable us to quantify the post-op hemodynamic performance by comparing with the ideal healthy physiological flow.
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Affiliation(s)
- Mohammad Rezaeimoghaddam
- Department of Mechanical Engineering, Koc University, Rumeli Feneri Campus, Sariyer, Istanbul, Turkey
| | - Gokce Nur Oguz
- Department of Mechanical Engineering, Koc University, Rumeli Feneri Campus, Sariyer, Istanbul, Turkey
| | - Mehmet Sanser Ates
- Department of Cardiovascular Surgery, Koc University Hospital, Topkapi, Istanbul, Turkey
| | - Tijen Alkan Bozkaya
- Department of Cardiovascular Surgery, Koc University Hospital, Topkapi, Istanbul, Turkey
| | - Senol Piskin
- Department of Mechanical Engineering, Istinye University, Zeytinburnu, Istanbul, Turkey
| | - S Samaneh Lashkarinia
- Department of Mechanical Engineering, Koc University, Rumeli Feneri Campus, Sariyer, Istanbul, Turkey
| | - Erhan Tenekecioglu
- Department of Cardiology, Health Sciences University, Bursa Education and Research Hospital, Bursa, Turkey
| | - Haldun Karagoz
- Department of Cardiovascular Surgery, VKV American Hospital, Istanbul, Turkey
| | - Kerem Pekkan
- Department of Mechanical Engineering, Koc University, Rumeli Feneri Campus, Sariyer, Istanbul, Turkey.
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Piskin S, Patnaik SS, Han D, Bordones AD, Murali S, Finol EA. A canonical correlation analysis of the relationship between clinical attributes and patient-specific hemodynamic indices in adult pulmonary hypertension. Med Eng Phys 2020; 77:1-9. [PMID: 32007361 DOI: 10.1016/j.medengphy.2020.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 10/19/2019] [Accepted: 01/06/2020] [Indexed: 11/19/2022]
Abstract
Pulmonary hypertension (PH) is a progressive disease affecting approximately 10-52 cases per million, with a higher incidence in women, and with a high mortality associated with right ventricle (RV) failure. In this work, we explore the relationship between hemodynamic indices, calculated from in silico models of the pulmonary circulation, and clinical attributes of RV workload and pathological traits. Thirty-four patient-specific pulmonary arterial tree geometries were reconstructed from computed tomography angiography images and used for volume meshing for subsequent computational fluid dynamics (CFD) simulations. Data obtained from the CFD simulations were post-processed resulting in hemodynamic indices representative of the blood flow dynamics. A retrospective review of medical records was performed to collect the clinical variables measured or calculated from standard hospital examinations. Statistical analyses and canonical correlation analysis (CCA) were performed for the clinical variables and hemodynamic indices. Systolic pulmonary artery pressure (sPAP), diastolic pulmonary artery pressure (dPAP), cardiac output (CO), and stroke volume (SV) were moderately correlated with spatially averaged wall shear stress (0.60 ≤ R2 ≤ 0.66; p < 0.05). Similarly, the CCA revealed a linear and strong relationship (ρ = 0.87; p << 0.001) between 5 clinical variables and 2 hemodynamic indices. To this end, in silico models of PH blood flow dynamics have a high potential for predicting the relevant clinical attributes of PH if analyzed in a group-wise manner using CCA.
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Affiliation(s)
- Senol Piskin
- Department of Mechanical Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA; Department of Mechanical Engineering, Istinye University, Zeytinburnu, Istanbul 34010, Turkey
| | - Sourav S Patnaik
- Department of Mechanical Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
| | - David Han
- Department of Management Science and Statistics, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
| | - Alifer D Bordones
- Department of Biomedical Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
| | - Srinivas Murali
- Department of Radiology and Department of Cardiology, Allegheny General Hospital, Allegheny Health Network, Pittsburgh, PA 15212, USA.
| | - Ender A Finol
- Department of Mechanical Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
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Rasooli R, Pekkan K. Heart valve inspired and multi‐stream aortic cannula: Novel designs for cardiopulmonary bypass improvement in neonates. Artif Organs 2019; 43:E233-E248. [DOI: 10.1111/aor.13462] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/14/2019] [Accepted: 03/21/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Reza Rasooli
- Department of Mechanical Engineering Koç University Sarıyer, Istanbul Turkey
| | - Kerem Pekkan
- Department of Mechanical Engineering Koç University Sarıyer, Istanbul Turkey
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Arnaz A, Pişkin Ş, Oğuz GN, Yalçınbaş Y, Pekkan K, Sarıoğlu T. Effect of modified Blalock-Taussig shunt anastomosis angle and pulmonary artery diameter on pulmonary flow. Anatol J Cardiol 2018; 20:2-8. [PMID: 29952372 PMCID: PMC6237788 DOI: 10.14744/anatoljcardiol.2018.54810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2018] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE This study aimed to identify the best graft-to-pulmonary artery (PA) anastomosis angle measuring pulmonary blood flow, wall shear stress (WSS), and shunt flow. METHODS A tetralogy of Fallot with pulmonary atresia computer model was used to study three different modified Blalock-Taussig shunt (mBTS) anastomosis angle configurations with three different PA diameter configurations. Velocity and WSS were analyzed, and the flow rates at the right PA (RPA) and left PA (LPA) were calculated. RESULTS A 4-mm and 8-mm diameter of RPA and LPA, respectively with vertical shunt angle produces the highest total flow. In the RPA larger diameter than the LPA configutations, the left-leaning shunt produces the lowest total PA flow whereas in the LPA larger diameter than the RPA configuratios, the right-leaning shunt produces the lowest total PA flow. Therefore, the shunt anastomosis should not be leaned through the narrow side of PA to reach best flow. As the flow inside the shunt increased, WSS also increased due to enhanced velocity gradients. CONCLUSION The anastomosis angle between the conduit and PA affects the flow to PA. Vertical anastomosis configurations increase the total PA flow; thus, these configurations are preferable than the leaned configurations.
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Affiliation(s)
- Ahmet Arnaz
- Department of Cardiovascular Surgery, Faculty of Medicine, Acıbadem Mehmet Ali Aydınlar University; İstanbul-Turkey.
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Piskin S, Unal G, Arnaz A, Sarioglu T, Pekkan K. Tetralogy of Fallot Surgical Repair: Shunt Configurations, Ductus Arteriosus and the Circle of Willis. Cardiovasc Eng Technol 2017; 8:107-119. [PMID: 28382440 PMCID: PMC5446850 DOI: 10.1007/s13239-017-0302-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 03/27/2017] [Indexed: 11/09/2022]
Abstract
In this study, hemodynamic performance of three novel shunt configurations that are considered for the surgical repair of tetralogy of Fallot (TOF) disease are investigated in detail. Clinical experience suggests that the shunt location, connecting angle, and its diameter can influence the post-operative physiology and the neurodevelopment of the neonatal patient. An experimentally validated second order computational fluid dynamics (CFD) solver and a parametric neonatal diseased great artery model that incorporates the ductus arteriosus (DA) and the full patient-specific circle of Willis (CoW) are employed. Standard truncated resistance CFD boundary conditions are compared with the full cerebral arterial system, which resulted 21, -13, and 37% difference in flow rate at the brachiocephalic, left carotid, and subclavian arteries, respectively. Flow splits at the aortic arch and cerebral arteries are calculated and found to change with shunt configuration significantly for TOF disease. The central direct shunt (direct shunt) has pulmonary flow 5% higher than central oblique shunt (oblique shunt) and 23% higher than modified Blalock Taussig shunt (RPA shunt) while the DA is closed. Maximum wall shear stress (WSS) in the direct shunt configuration is 9 and 60% higher than that of the oblique and RPA shunts, respectively. Patent DA, significantly eliminated the pulmonary flow control function of the shunt repair. These results suggests that, due to the higher flow rates at the pulmonary arteries, the direct shunt, rather than the central oblique, or right pulmonary artery shunts could be preferred by the surgeon. This extended model introduced new hemodynamic performance indices for the cerebral circulation that can correlate with the post-operative neurodevelopment quality of the patient.
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Affiliation(s)
- Senol Piskin
- Department of Mechanical Engineering, Koç University, Rumeli Feneri Kampüsü, Sarıyer, Istanbul, Turkey
| | - Gozde Unal
- Faculty of Engineering and Natural Sciences, Sabancı University, Tuzla, Istanbul, Turkey
| | - Ahmet Arnaz
- Department of Cardiovascular Surgery, Acıbadem Bakırköy Hospital, Istanbul, Turkey
| | - Tayyar Sarioglu
- Department of Pediatric Cardiovascular Surgery, School of Medicine, Acıbadem University, Istanbul, Turkey
| | - Kerem Pekkan
- Department of Mechanical Engineering, Koç University, Rumeli Feneri Kampüsü, Sarıyer, Istanbul, Turkey.
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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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Abstract
In this Editor's Review, articles published in 2015 are organized by category and briefly summarized. We aim to provide a brief reflection of the currently available worldwide knowledge that is intended to advance and better human life while providing insight for continued application of technologies and methods of organ Replacement, Recovery, and Regeneration. As the official journal of The International Federation for Artificial Organs, The International Faculty for Artificial Organs, the International Society for Rotary Blood Pumps, the International Society for Pediatric Mechanical Cardiopulmonary Support, and the Vienna International Workshop on Functional Electrical Stimulation, Artificial Organs continues in the original mission of its founders "to foster communications in the field of artificial organs on an international level." Artificial Organs continues to publish developments and clinical applications of artificial organ technologies in this broad and expanding field of organ Replacement, Recovery, and Regeneration from all over the world. We take this time also to express our gratitude to our authors for providing their work to this journal. We offer our very special thanks to our reviewers who give so generously of their time and expertise to review, critique, and especially provide meaningful suggestions to the author's work whether eventually accepted or rejected. Without these excellent and dedicated reviewers, the quality expected from such a journal could not be possible. We also express our special thanks to our Publisher, John Wiley & Sons for their expert attention and support in the production and marketing of Artificial Organs. We look forward to reporting further advances in the coming years.
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Alkan-Bozkaya T, Özyüksel A, Salihoğlu E, Haydın S, Tanyıldız M, Pekkan K, Hatemi A, Türköz A, Erkan H, Aydın S, Kahraman A, Savaş A, Ersoy C, Türkoğlu H, Ündar A, Akçevin A. Eighth Istanbul symposium on pediatric extracorporeal life support systems and pediatric cardiopulmonary perfusion. Artif Organs 2015; 39:E49-55. [PMID: 25953239 DOI: 10.1111/aor.12512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
| | - Arda Özyüksel
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
| | - Ece Salihoğlu
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
| | - Sertaç Haydın
- Department of Pediatric Cardiovascular Surgery, Istanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul, Turkey
| | - Murat Tanyıldız
- Department of Pediatrics, Hacettepe University, Ankara, Turkey
| | - Kerem Pekkan
- Department of Bioengineering, Koc University, Istanbul, Turkey
| | - Alican Hatemi
- Department of Pediatric Cardiovascular Surgery, Kartal Kosuyolu Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul, Turkey.,Department of Cardiovascular Surgery, Institute of Cardiology, Istanbul University, Istanbul, Turkey
| | - Ayda Türköz
- Department of Anesthesiology, Baskent University, Istanbul, Turkey
| | - Halime Erkan
- Department of Pediatric Cardiovascular Surgery, Istanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul, Turkey
| | - Sibel Aydın
- Department of Pediatric Cardiovascular Surgery, Kartal Kosuyolu Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul, Turkey
| | - Aydın Kahraman
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
| | - Alper Savaş
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
| | - Cihangir Ersoy
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
| | - Halil Türkoğlu
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
| | - Akif Ündar
- Department of Pediatrics, Surgery and Bioengineering, Penn State College of Medicine, Penn State Hershey Pediatric Cardiovascular Research Center, Penn State Hershey Children's Hospital, 500 University Drive, PO Box 850, Hershey, PA, 17033-0850, USA.
| | - Atıf Akçevin
- Department of Cardiovascular Surgery, Medipol University, Istanbul, Turkey
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