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Szafron JM, Heng EE, Boyd J, Humphrey JD, Marsden AL. Hemodynamics and Wall Mechanics of Vascular Graft Failure. Arterioscler Thromb Vasc Biol 2024; 44:1065-1085. [PMID: 38572650 PMCID: PMC11043008 DOI: 10.1161/atvbaha.123.318239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 03/12/2024] [Indexed: 04/05/2024]
Abstract
Blood vessels are subjected to complex biomechanical loads, primarily from pressure-driven blood flow. Abnormal loading associated with vascular grafts, arising from altered hemodynamics or wall mechanics, can cause acute and progressive vascular failure and end-organ dysfunction. Perturbations to mechanobiological stimuli experienced by vascular cells contribute to remodeling of the vascular wall via activation of mechanosensitive signaling pathways and subsequent changes in gene expression and associated turnover of cells and extracellular matrix. In this review, we outline experimental and computational tools used to quantify metrics of biomechanical loading in vascular grafts and highlight those that show potential in predicting graft failure for diverse disease contexts. We include metrics derived from both fluid and solid mechanics that drive feedback loops between mechanobiological processes and changes in the biomechanical state that govern the natural history of vascular grafts. As illustrative examples, we consider application-specific coronary artery bypass grafts, peripheral vascular grafts, and tissue-engineered vascular grafts for congenital heart surgery as each of these involves unique circulatory environments, loading magnitudes, and graft materials.
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Affiliation(s)
- Jason M Szafron
- Departments of Pediatrics (J.M.S., A.L.M.), Stanford University, CA
| | - Elbert E Heng
- Cardiothoracic Surgery (E.E.H., J.B.), Stanford University, CA
| | - Jack Boyd
- Cardiothoracic Surgery (E.E.H., J.B.), Stanford University, CA
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, CT (J.D.H.)
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Enomoto T, Mishima T, Tsuchida M. Blood flow analysis with computational fluid dynamics in the left atrium after left atrial plication: a prospective study. Gen Thorac Cardiovasc Surg 2024; 72:209-215. [PMID: 37550585 DOI: 10.1007/s11748-023-01963-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 07/17/2023] [Indexed: 08/09/2023]
Abstract
OBJECTIVE This study aimed to evaluate blood flow stagnation in an enlarged left atrium (LA) and prove that left atrial plication (LAP) could alleviate the stagnation. METHODS Five patients with chronic atrial fibrillation who underwent mitral valve surgery followed by LAP for an enlarged LA with a ≥ 60-mm diameter were included. We performed computational fluid dynamics (CFD) analysis using preoperative and postoperative computed tomography and four-dimensional flow magnetic resonance imaging. Additionally, computer graphics were used to create virtual left atrial appendage resection (LAAR) images. We performed CFD analysis to assess blood flow stagnation in the LA for three groups: preoperative, LAAR, and LAP. RESULTS When the average and constant stagnation volumes were both set to 100 preoperatively, the average stagnation volumes of the LAAR and LAP groups were 67.42 ± 18.64 and 35.88 ± 8.20, respectively. The constant stagnation volumes of these groups reduced to 45.01 ± 7.43 and 21.14 ± 7.70, respectively. The LAP group also had significantly lower average and constant stagnation volumes than those in the LAAR group (p = 0.006 and p = 0.033, respectively). CONCLUSIONS Blood flow stagnation was noted in the LAA and enlarged LA. CFD analysis revealed that LAP for the enlarged LA improved blood flow stagnation more than the virtual LAAR alone. CLINICAL TRIAL REGISTRY NUMBER UMIN000049923.
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Affiliation(s)
- Takashi Enomoto
- Division of Thoracic and Cardiovascular Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachidori, Chuo-ku, Niigata, Niigata, 951-8510, Japan.
| | - Takehito Mishima
- Division of Thoracic and Cardiovascular Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachidori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
| | - Masanori Tsuchida
- Division of Thoracic and Cardiovascular Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachidori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
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Fernandes JF, Bellsham-Revell H, Wong J, Salih C, Pushparajah K, Lamata P, de Vecchi A. Hemodynamic inefficiencies during stress hold key for comprehensive assessment after Fontan operation. JTCVS Tech 2024; 23:81-85. [PMID: 38352014 PMCID: PMC10859639 DOI: 10.1016/j.xjtc.2023.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 02/16/2024] Open
Affiliation(s)
- Joao F. Fernandes
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Hannah Bellsham-Revell
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospital, London, United Kingdom
| | - James Wong
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospital, London, United Kingdom
| | - Caner Salih
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospital, London, United Kingdom
| | - Kuberan Pushparajah
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospital, London, United Kingdom
| | - Pablo Lamata
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Adelaide de Vecchi
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
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Recco DP, Kizilski SB, Ghosh RM, Piekarski B, Prakash A, Hoganson DM. Aortic growth after arch reconstruction with patch augmentation: a 2-decade experience. INTERDISCIPLINARY CARDIOVASCULAR AND THORACIC SURGERY 2023; 37:ivad210. [PMID: 38134426 PMCID: PMC10752579 DOI: 10.1093/icvts/ivad210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 12/06/2023] [Accepted: 12/20/2023] [Indexed: 12/24/2023]
Abstract
OBJECTIVES Optimal aortic sizing during aortic arch reconstruction remains unknown. Negative effects of arch under- or oversizing are well-published. We aimed to characterize longitudinal aortic growth after patch-augmented arch reconstruction to identify the initial reconstructed arch size that results in normal mid-term arch dimensions. METHODS Single-centre, retrospective review of infants undergoing Damus-Kaye-Stansel (DKS) or non-DKS patch-augmented aortic arch reconstruction between 2000 and 2021. Ascending aorta, proximal and distal transverse arch, aortic isthmus (AIsth) and descending aorta dimensions were measured in postoperative echocardiograms (<3 months from index operation) and cross-sectional imaging (>12 months). Longitudinal changes to aortic dimensions and z-scores were analysed. Secondary outcomes included reintervention, valve and ventricular function, mortality and transplantation. RESULTS Fifty-four patients (16 DKS, 38 non-DKS) were included. At 6.3 [2.2, 12.0]-year follow-up, all aortic segments grew significantly in both groups, while z-scores remained unchanged except for non-DKS proximal and distal transverse arch z-scores, which significantly increased (P < 0.05 each). When stratified by initial postoperative z-score (z < -1, -1 ≤ z ≤ 1, z > 1), non-DKS patients with initial AIsth z-score <-1 had a final z-score significantly smaller than both the targeted z-score zero (P = 0.014) and final z-score in a group with initial postoperative z-score ±1 (P = 0.009). Valve and ventricular function remained stable. Eighteen patients required reintervention, 1 died and 1 underwent transplant. CONCLUSIONS Over mid-term follow-up, aortic growth after arch reconstruction with patch augmentation was proportional when repaired to normal z-score dimensions, aside from proximal transverse arch, which disproportionately dilated. AIsth undersizing prevailed mid-term and trended towards a higher reintervention rate. Initial reconstruction between z-score 0 and +1 resulted in maintenance of that z-score size at mid-term follow-up. Overall, it is crucial to achieve targeted aortic sizing at index operation to maintain appropriate aortic dimensions over time and reduce reintervention risk with specific focus on the AIsth.
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Affiliation(s)
- Dominic P Recco
- Department of Cardiac Surgery, Boston Children’s Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Shannen B Kizilski
- Department of Cardiac Surgery, Boston Children’s Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Reena M Ghosh
- Harvard Medical School, Boston, MA, USA
- Department of Cardiology, Boston Children’s Hospital, Boston, MA, USA
| | - Breanna Piekarski
- Department of Cardiac Surgery, Boston Children’s Hospital, Boston, MA, USA
| | - Ashwin Prakash
- Harvard Medical School, Boston, MA, USA
- Department of Cardiology, Boston Children’s Hospital, Boston, MA, USA
| | - David M Hoganson
- Department of Cardiac Surgery, Boston Children’s Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
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Nakano T, Kaneda H, Murakawa T. Stagnating blood flow related to thrombus formation in pulmonary vein stump after left upper lobectomy. Gen Thorac Cardiovasc Surg 2023; 71:648-656. [PMID: 36939983 PMCID: PMC10587221 DOI: 10.1007/s11748-023-01926-7] [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: 01/20/2023] [Accepted: 03/05/2023] [Indexed: 03/21/2023]
Abstract
OBJECTIVES A thrombus can occur in the stump of the pulmonary vein after left upper lobectomy, potentially causing postoperative cerebral infarction. This study aimed to verify the hypothesis that stagnation of blood flow inside the pulmonary vein stump causes thrombus formation. METHODS The three-dimensional geometry of the pulmonary vein stump after left upper lobectomy was recreated using contrast-enhanced computed tomography. Blood flow velocity and wall shear stress (WSS) inside the pulmonary vein stump were analysed using the computational fluid dynamics (CFD) method and compared between the two groups (those with or without thrombus). RESULTS The volumes of average flow velocity per heartbeat < 10 mm/s, 3 mm/s, 1 mm/s (p-values 0.0096, 0.0016, 0.0014, respectively) and the volumes where flow velocity was always below the three cut-off values (p-values 0.019, 0.015, 0.017, respectively) were significantly larger in patients with a thrombus than in those without thrombus. The areas of average WSS per heartbeat < 0.1 Pa, 0.03 Pa, 0.01 Pa (p-values 0.0002, < 0.0001, 0.0002, respectively), and the areas where WSS was always below the three cut-off values (p-values 0.0088, 0.0041, 0.0014, respectively) were significantly larger in patients with thrombus than in those without thrombus. CONCLUSIONS The area of blood flow stagnation in the stump calculated by CFD method was significantly larger in patients with than in those without thrombus. This result elucidates that stagnation of blood flow promotes thrombus formation in the pulmonary vein stump in patients who undergo left upper lobectomy.
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Affiliation(s)
- Takahito Nakano
- Department of Thoracic Surgery, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan.
| | - Hiroyuki Kaneda
- Department of Thoracic Surgery, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
| | - Tomohiro Murakawa
- Department of Thoracic Surgery, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
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Tsubata H, Nakanishi N, Itatani K, Takigami M, Matsubara Y, Ogo T, Fukuda T, Matsuda H, Matoba S. Pulmonary artery blood flow dynamics in chronic thromboembolic pulmonary hypertension. Sci Rep 2023; 13:6490. [PMID: 37081116 PMCID: PMC10119089 DOI: 10.1038/s41598-023-33727-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 04/18/2023] [Indexed: 04/22/2023] Open
Abstract
Chronic thromboembolic pulmonary hypertension is caused by incomplete resolution and organization of thrombi. Blood flow dynamics are involved in thrombus formation; however, only a few studies have reported on pulmonary artery blood flow dynamics in patients with chronic thromboembolic pulmonary hypertension. Furthermore, the effects of treatment interventions on pulmonary artery blood flow dynamics are not fully understood. The aim of the study was to evaluate pulmonary artery blood flow dynamics in patients with chronic thromboembolic pulmonary hypertension before and after pulmonary endarterectomy and balloon pulmonary angioplasty, using computational fluid dynamics. We analyzed patient-specific pulmonary artery models of 10 patients with chronic thromboembolic pulmonary hypertension and three controls using computational fluid dynamics. In patients with chronic thromboembolic pulmonary hypertension, flow velocity and wall shear stress in the pulmonary arteries were significantly decreased, and the oscillatory shear index and blood stagnation volume were significantly increased than in controls. Pulmonary endarterectomy induced redistribution of pulmonary blood flow and improved blood flow dynamics in the pulmonary artery. Balloon pulmonary angioplasty improved pulmonary blood flow disturbance, decreased blood flow stagnation, and increased wall shear stress, leading to vasodilatation of the distal portion of the pulmonary artery following balloon pulmonary angioplasty treatment.
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Affiliation(s)
- Hideo Tsubata
- Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan
| | - Naohiko Nakanishi
- Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan.
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Masao Takigami
- Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan
| | - Yuki Matsubara
- Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan
| | - Takeshi Ogo
- Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Tetsuya Fukuda
- Department of Radiology, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Hitoshi Matsuda
- Department of Vascular Surgery, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Satoaki Matoba
- Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan
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Liang J, Lu B, Zhao X, Wang J, Zhao D, Zhang G, Zhu B, Ma Q, Pan G, Li D. Feasibility analyses of virtual models and 3D printing for surgical simulation of the double-outlet right ventricle. Med Biol Eng Comput 2022; 60:3029-3040. [DOI: 10.1007/s11517-022-02660-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 04/22/2022] [Indexed: 11/30/2022]
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Sano S, Sano T, Kobayashi Y, Kotani Y, Kouretas PC, Kasahara S. Journey Toward Improved Long-Term Outcomes After Norwood-Sano Procedure: Focus on the Aortic Arch Reconstruction. World J Pediatr Congenit Heart Surg 2022; 13:581-587. [PMID: 36053099 DOI: 10.1177/21501351221116766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The disadvantage of right ventricle-to-pulmonary artery (RV-PA) shunt is the need for more unplanned interventions to address stenosis in the shunt or branch pulmonary arteries, as compared to the modified Blalock-Taussig shunt group. Ring-enforced RV-PA PTFE conduit and dunk technique minimized these complications and right ventricle (RV) damage. Aortic arch obstruction increases afterload and leads to ventricular dysfunction and tricuspid regurgitation; therefore, most surgeons prefer to use homograft, autologous pericardium, or bovine pericardium to reconstruct the neoaorta. Artificial materials decrease the elastic properties, increase wall stiffness, and decrease the distensibility of the aorta; and as a result, RV function gradually deteriorates. This inelastic reconstructed aorta may be one of the reasons why long-term outcomes after the Fontan procedure are worse in hypoplastic left heart syndrome (HLHS) patients, in comparison to non-HLHS. Reconstruction of the neoaorta without any patch materials, or at least techniques that largely minimize the use of non-autologous materials, will offer a further refinement of our ability to optimize ventriculoarterial coupling and thereby long-term RV function.
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Affiliation(s)
- Shunji Sano
- Division of Pediatric Cardiac Surgery, Pediatric Heart Disease & Adult Congenital Heart Disease Center, 13059Showa University Hospital, Tokyo, Japan
| | - Toshikazu Sano
- Division of Pediatric Cardiac Surgery, Pediatric Heart Disease & Adult Congenital Heart Disease Center, 13059Showa University Hospital, Tokyo, Japan
| | - Yasuyuki Kobayashi
- Department of Cardiovascular Surgery, 12997Okayama University Hospital, Okayama, Japan
| | - Yasuhiro Kotani
- Department of Cardiovascular Surgery, 12997Okayama University Hospital, Okayama, Japan
| | - Peter C Kouretas
- Division of Pediatric Cardiothoracic Surgery, Department of Surgery, 1439University California San Francisco, San Francisco, CA, USA
| | - Shingo Kasahara
- Department of Cardiovascular Surgery, 12997Okayama University Hospital, Okayama, Japan
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Faraji A, Sahebi M, SalavatiDezfouli S. Numerical investigation of different viscosity models on pulsatile blood flow of thoracic aortic aneurysm (TAA) in a patient-specific model. Comput Methods Biomech Biomed Engin 2022; 26:986-998. [PMID: 35882063 DOI: 10.1080/10255842.2022.2102423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Aortic aneurysm is one of the most common aortic diseases that can lead to unfortunate consequences. Numerical simulations have an important role in the prediction of the aftereffects of vascular diseases including aneurysm. In this research, numerical simulation of pulsatile blood flow is performed for a 3-dimensional patient-specific model of a thoracic aortic aneurysm (TAA). Since the choice of blood viscosity model may have a significant impact on the simulation results, the effects of four non-Newtonian models of blood viscosity namely Carreau, Casson, Herschel-Bulkley, power low, and the Newtonian model on the wall shear stress (WSS) distribution, shear rate, and oscillatory shear index (OSI) have been analyzed. Simulation results showed that all the non-Newtonian and Newtonian models generally, predict similar patterns for blood flow and shear rate. At high flow rates in the cardiac cycle, the WSS value for all the models are similar to each other except for the power-law model due to the shear thinning behavior. All models predict high values of OSI on the inner wall of the ascending aorta and broad areas of the inner wall of the aneurysm sac. However, the Newtonian model predicts the OSI less than the non-Newtonian models in some areas of the aneurysm sac. Results indicated that the Newtonian model generally can predict the hemodynamic parameters of the blood flow similar to the non-Newtonian but for more precise analysis and to predict the regions prone to rupture and atherosclerosis, choosing a proper non-Newtonian model is recommended.
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Affiliation(s)
- Amir Faraji
- Department of Mechanical Engineering, Qom University of Technology, Qom, Iran
| | - Mahdi Sahebi
- Department of Mechanical Engineering, Qom University of Technology, Qom, Iran
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Qiao Y, Luo K, Fan J. Component quantification of aortic blood flow energy loss using computational fluid-structure interaction hemodynamics. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 221:106826. [PMID: 35526507 DOI: 10.1016/j.cmpb.2022.106826] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 04/13/2022] [Accepted: 04/19/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND AND OBJECTIVES The aorta serves as the main tube of the human blood circulation system. Energy loss (EL) occurs when blood flows through the aorta and there may be a potential correlation between EL and aortic diseases. However, the components of blood flow EL are still not fully understood. This study aims to quantitatively reveal the EL components in healthy and diseased aortas. METHODS We construct an idealized healthy aorta and three idealized representative diseased aortas: aortic aneurysm, coarctation of the aorta, and aortic dissection. Computational hemodynamic studies are carried out by using the fluid-structure interaction simulation framework. RESULTS Four kinds of EL components: viscous friction, turbulence dissipation, wall deformation, and local lesion are firstly acquired in healthy and diseased aortas based on the high-resolution blood flow information. Viscous friction contributes most to the EL (45.69%-57.22%). EL caused by the deformation of the aortic wall ranks second (15.18%-33.12%). The proportions of turbulence dissipation and local lesion depend on individual geometric characteristics. Besides, the buffering efficiency of the healthy and diseased aorta is about 80%. CONCLUSIONS This study quantitatively reports the components of blood flow EL in healthy and diseased aortas, the finding may provide novel insights into the pathogenesis of aortic diseases.
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Affiliation(s)
- Yonghui Qiao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Kun Luo
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China; Shanghai Institute for Advanced Study of Zhejiang University, Shanghai, China.
| | - Jianren Fan
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China; Shanghai Institute for Advanced Study of Zhejiang University, Shanghai, China
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Asada S, Yamagishi M, Itatani K. Gradual caliber transition of the neoaortic arch after the Norwood procedure can prevent neoaortic dilation and right ventricular deterioration. JTCVS OPEN 2022; 10:350-351. [PMID: 36004230 PMCID: PMC9390451 DOI: 10.1016/j.xjon.2022.04.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Zhang X, Chen D, Wu M, Dong H, Wan Z, Jia H, Liang S, Shao J, Zheng J, Xu S, Xiong J, Guo W. Functional Evaluation of Embedded Modular Single-Branched Stent Graft: Application to Type B Aortic Dissection With Aberrant Right Subclavian Artery. Front Cardiovasc Med 2022; 9:869505. [PMID: 35586645 PMCID: PMC9108238 DOI: 10.3389/fcvm.2022.869505] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 04/12/2022] [Indexed: 11/13/2022] Open
Abstract
Background Endovascular repair of type B aortic dissection (TBAD) with aberrant right subclavian artery (ARSA) is challenging due to anatomical complexity. The embedded modular single-branched stent graft (EMSBSG) could solve this problem. However, the hemodynamic efficacy of this innovative technique has not been fully assessed. This study aimed to propose morphometric and functional indicators to quantify the outcomes of EMSBSG in treating TBAD with ARSA. Material and Methods A patient who had TBAD with ARSA underwent EMSBSG implantation was admitted. Computational fluid dynamics (CFD) and three-dimensional structural analyses were conducted based on CTA datasets before the operation (Pre-1) and at 4 and 25 days after EMSBSG implantation (Post-1 and Post-2). Quantitative and qualitative functional analyses were conducted via pressure-, velocity- and wall shear stress (WSS) -based parameters, such as the luminal pressure difference (LPD), total energy loss, and flow distribution ratio. By precisely registering the aortas at the three time points, parameter variations in the EMSBSG region were also computed to investigate the prognostic improvement after EMSBSG implantation. Results The first balance point of LPD distally shifted to the abdominal aorta in Post-1 by a distance of 20.172 cm, and shifted out of the dissected region in Post-2, indicating positive pressure recovery post EMSBSG. The flow distribution ratios of all aortic arch branches increased after EMSBSG implantation. A positive normal deformation index in the EMSBSG region confirmed true lumen expansion; dominant ARN (area ratio of negative value) of pressure and WSS-based parameters indicated an improved prognosis from Post-1 to Post-2. Conclusions The short-term results of EMSBSG in treating TBAD with ARSA proved to be promising, especially in EMSBSG region. Comprehensive evaluation could provide new insight into the therapy of TBAD with ARSA. Thus, it might guide the further management of complex aortic arch lesions.
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Liang S, Jia H, Zhang X, Guo W, Zhou G, Li S, Yuan P, Xiong J, Chen D. In-vitro and In-silico Haemodynamic Analyses of a Novel Embedded Iliac Branch Device. Front Cardiovasc Med 2022; 9:828910. [PMID: 35449876 PMCID: PMC9016111 DOI: 10.3389/fcvm.2022.828910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 03/11/2022] [Indexed: 11/13/2022] Open
Abstract
Background Iliac branch devices (IBDs) are valid tools for internal iliac artery preservation during endovascular abdominal aortic aneurysm and iliac aneurysm repair. The purpose of this study was to evaluate the effectiveness of a novel IBD with an embedded branch configuration. Method A typical iliac artery model was reconstructed, and two models were manufactured using three-dimensional printing technology. The novel IBD was deployed into one iliac artery model by an experienced vascular surgeon. A mock circulation loop (MCL) and a computational fluid dynamics (CFD) simulation were used to investigate the haemodynamic parameters of the iliac models without (Model A) and with (Model B) the IBD. A morphological analysis was conducted using computed tomography angiography and medical endoscopy. The flow distribution rate (FDR) and energy loss (EL) were used to quantify IBD performance. Results The FDR of the right internal iliac artery in the MCL of Model A and Model B was 18.88 ± 0.12% and 16.26 ± 0.09%, respectively (P = 0.0013). The FDR of the right internal iliac artery in the CFD simulation of Model A and Model B was 17.52 and 14.49%, respectively. The EL of Model A was greater than Model B in both the MCL and the CFD simulation. Compared with Model A, Model B had a larger region (8.46 vs. 3.64%) with a relative residence time of >20 Pa−1 at peak systole. Meanwhile, the area where the oscillatory flow index was >0.4 was significantly smaller in Model B than in Model A (0.46 vs. 0.043%). The region with an average wall shear stress of >4 Pa was greater in Model B than in Model A (0 vs. 0.22%). Conclusion The MCL and CFD simulation showed that the novel IBD had little impact on the FDR and EL of the iliac artery models. However, the IBD might be an effective tool for the treatment of abdominal aortic/iliac aneurysms that extend into branches. Further investigations are warranted to confirm whether this IBD could be useful in the clinic.
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Affiliation(s)
- Shichao Liang
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Heyue Jia
- Department of Vascular and Endovascular Surgery, Chinese PLA General Hospital, Beijing, China
| | - Xuehuan Zhang
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Wei Guo
- Department of Vascular and Endovascular Surgery, Chinese PLA General Hospital, Beijing, China
| | - Guojing Zhou
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Shilong Li
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Panpan Yuan
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Jiang Xiong
- Department of Vascular and Endovascular Surgery, Chinese PLA General Hospital, Beijing, China
- Jiang Xiong
| | - Duanduan Chen
- School of Life Science, Beijing Institute of Technology, Beijing, China
- School of Medical Technology, Beijing Institute of Technology, Beijing, China
- Wenzhou Safety (Emergency) Institute of Tianjin University, Tianjin, China
- *Correspondence: Duanduan Chen
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Mayoral I, Bevilacqua E, Gómez G, Hmadcha A, González-Loscertales I, Reina E, Sotelo J, Domínguez A, Pérez-Alcántara P, Smani Y, González-Puertas P, Mendez A, Uribe S, Smani T, Ordoñez A, Valverde I. Tissue engineered in-vitro vascular patch fabrication using hybrid 3D printing and electrospinning. Mater Today Bio 2022; 14:100252. [PMID: 35509864 PMCID: PMC9059085 DOI: 10.1016/j.mtbio.2022.100252] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/29/2022] [Accepted: 03/31/2022] [Indexed: 11/05/2022] Open
Abstract
Three-dimensional (3D) engineered cardiovascular tissues have shown great promise to replace damaged structures. Specifically, tissue engineering vascular grafts (TEVG) have the potential to replace biological and synthetic grafts. We aimed to design an in-vitro patient-specific patch based on a hybrid 3D print combined with vascular smooth muscle cells (VSMC) differentiation. Based on the medical images of a 2 months-old girl with aortic arch hypoplasia and using computational modelling, we evaluated the most hemodynamically efficient aortic patch surgical repair. Using the designed 3D patch geometry, the scaffold was printed using a hybrid fused deposition modelling (FDM) and electrospinning techniques. The scaffold was seeded with multipotent mesenchymal stem cells (MSC) for later maturation to derived VSMC (dVSMC). The graft showed adequate resistance to physiological aortic pressure (burst pressure 101 ± 15 mmHg) and a porosity gradient ranging from 80 to 10 μm allowing cells to infiltrate through the entire thickness of the patch. The bio-scaffolds showed good cell viability at days 4 and 12 and adequate functional vasoactive response to endothelin-1. In summary, we have shown that our method of generating patient-specific patch shows adequate hemodynamic profile, mechanical properties, dVSMC infiltration, viability and functionality. This innovative 3D biotechnology has the potential for broad application in regenerative medicine and potentially in heart disease prevention.
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Key Words
- 3D printing
- Electrospinning
- Endothelin Receptor A, ETA
- Endothelin Receptor B, ETB
- Mesenchymal stem cells
- Reverse Transcription, Rt
- Three-dimensional, 3D
- Tissue engineering
- Vascular graft
- anti-alpha-smooth muscle actin, α-SMA
- anti-cluster of differentiation 31, CD31
- anti-fibroblast specific protein 1, FSP1
- anti-smooth muscle protein 22, SM-22
- bone morphogenetic protein, BMP4
- computation fluid dynamic, CFD
- computed tomography, CT
- derived VSMC, dVSMC
- endothelin-1, ET-1
- extracellular matrix, ECM
- fused deposition modelling, FDM
- mesenchymal stem cells, MSC
- platelet-derived growth factor composed by two beta chains, PDGF-BB
- room temperature, RT
- tissue engineering vascular grafts, TEVG
- transforming growth factor beta 1, TGFβ-1
- vascular smooth muscle cells, VSMC
- wall shear stress, WSS
- western blotting, WB
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Affiliation(s)
- Isabel Mayoral
- Cardiovascular Pathophysiology Group, Institute of Biomedicine of Seville- IBiS, University of Seville /HUVR/CSIC, Seville, Spain
| | - Elisa Bevilacqua
- Cardiovascular Pathophysiology Group, Institute of Biomedicine of Seville- IBiS, University of Seville /HUVR/CSIC, Seville, Spain
| | - Gorka Gómez
- Cardiovascular Pathophysiology Group, Institute of Biomedicine of Seville- IBiS, University of Seville /HUVR/CSIC, Seville, Spain
| | - Abdelkrim Hmadcha
- Advanced Therapies and Regenerative Medicine Research Group.General Hospital, Alicante Institute for Health and Biomedical Research (ISABIAL), Alicante, Spain
- Department of Molecular Biology and Biochemical Engineering, Universidad Pablo de Olavide, Seville, Spain
| | - Ignacio González-Loscertales
- Department Mechanical, Thermal and Fluids Engineering, School of Engineering, University of Málaga, Málaga, Spain
| | - Esther Reina
- Department of Mechanical and Manufacturing Engineering, University of Seville, Seville, Spain
| | - Julio Sotelo
- School of Biomedical Engineering, Universidad de Valparaíso, Valparaíso, Chile
- Millennium Institute for Intelligent Healthcare Engineering, iHEALTH, Millennium Nucleus in Cardiovascular Magnetic Resonance, Cardio MR, and Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Pedro Pérez-Alcántara
- Department of Mechanical and Manufacturing Engineering, University of Seville, Seville, Spain
| | - Younes Smani
- Department of Molecular Biology and Biochemical Engineering, Andalusian Center of Developmental Biology, CSIC, University of Pablo de Olavide, Seville, Spain
| | | | - Ana Mendez
- Pediatric Cardiology Unit, Hospital Virgen Del Rocio, Seville, Spain
| | - Sergio Uribe
- Millennium Institute for Intelligent Healthcare Engineering, iHEALTH, Millennium Nucleus in Cardiovascular Magnetic Resonance, Cardio MR, and Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Santiago, Chile
- Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Tarik Smani
- Cardiovascular Pathophysiology Group, Institute of Biomedicine of Seville- IBiS, University of Seville /HUVR/CSIC, Seville, Spain
- Department of Medical Physiology and Biophysics, School of Medicine, University of Seville, Seville, Spain
| | - Antonio Ordoñez
- Cardiovascular Pathophysiology Group, Institute of Biomedicine of Seville- IBiS, University of Seville /HUVR/CSIC, Seville, Spain
| | - Israel Valverde
- Cardiovascular Pathophysiology Group, Institute of Biomedicine of Seville- IBiS, University of Seville /HUVR/CSIC, Seville, Spain
- Pediatric Cardiology Unit, Hospital Virgen Del Rocio, Seville, Spain
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- Department of Pharmacology, Pediatric and Radiology, School of Medicine, University of Seville, Seville, Spain
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15
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Terada M, Takehara Y, Isoda H, Wakayama T, Nozaki A. Technical Background for 4D Flow MR Imaging. Magn Reson Med Sci 2022; 21:267-277. [PMID: 35153275 PMCID: PMC9680548 DOI: 10.2463/mrms.rev.2021-0104] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/20/2021] [Indexed: 10/27/2023] Open
Abstract
Recently, the hemodynamic assessments with 3D cine phase-contrast (PC) MRI (4D flow MRI) have attracted considerable attention from clinicians. Unlike 2D cine PC MRI, the technique allows for cardiac phase-resolved data acquisitions of flow velocity vectors within the entire FOV during a clinically viable period. Thus, the method has enabled retrospective flowmetry in the spatial and temporal axes, which are essential to derive hemodynamic parameters related to vascular homeostasis and those to the progression of the pathologies. Accelerations in imaging are critical for this technology to be clinically viable; however, a high SNR or velocity-to-noise ratio (VNR) is also vital for accurate flow measurements. In this chapter, the technologies enabling this difficult balance are discussed.
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Affiliation(s)
- Masaki Terada
- Department of Diagnostic Radiologic Technology, Iwata City Hospital, Iwata, Shizuoka, Japan
| | - Yasuo Takehara
- Department of Fundamental Development for Advanced Low Invasive Diagnostic Imaging, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Haruo Isoda
- Department of Brain & Mind Sciences, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | | | - Atsushi Nozaki
- MR Applications and Workflow, GE Healthcare Japan, Tokyo, Japan
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16
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de Vecchi A, Faraci A, Fernandes JF, Marlevi D, Bellsham-Revell H, Hussain T, Laji N, Ruijsink B, Wong J, Razavi R, Anderson D, Salih C, Pushparajah K, Nordsletten D, Lamata P. Unlocking the Non-invasive Assessment of Conduit and Reservoir Function in the Aorta. J Cardiovasc Transl Res 2022; 15:1075-1085. [PMID: 35199256 PMCID: PMC9622527 DOI: 10.1007/s12265-022-10221-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 02/14/2022] [Indexed: 11/06/2022]
Abstract
Aortic surgeries in congenital conditions, such as hypoplastic left heart syndrome (HLHS), aim to restore and maintain the conduit and reservoir functions of the aorta. We proposed a method to assess these two functions based on 4D flow MRI, and we applied it to study the aorta in pre-Fontan HLHS. Ten pre-Fontan HLHS patients and six age-matched controls were studied to derive the advective pressure difference and viscous dissipation for conduit function, and pulse wave velocity and elastic modulus for reservoir function. The reconstructed neo-aorta in HLHS subjects achieved a good conduit function at a cost of an impaired reservoir function (69.7% increase of elastic modulus). The native descending HLHS aorta displayed enhanced reservoir (elastic modulus being 18.4% smaller) but impaired conduit function (three-fold increase in peak advection). A non-invasive and comprehensive assessment of aortic conduit and reservoir functions is feasible and has potentially clinical relevance in congenital vascular conditions.
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Affiliation(s)
- Adelaide de Vecchi
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - Alessandro Faraci
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - Joao Filipe Fernandes
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - David Marlevi
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Hannah Bellsham-Revell
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospitals, London, SE1 7EH, UK
| | - Tarique Hussain
- Pediatric Cardiology, UT Southwestern, Children's Medical Center Dallas, 1935 Medical District Dr, Dallas, TX, 75235, USA
| | - Nidhin Laji
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - Bram Ruijsink
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - James Wong
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - Reza Razavi
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - David Anderson
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospitals, London, SE1 7EH, UK
| | - Caner Salih
- Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's & St Thomas' Hospitals, London, SE1 7EH, UK
| | - Kuberan Pushparajah
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - David Nordsletten
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK.,Department of Biomedical Engineering and Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Pablo Lamata
- School of Biomedical Engineering and Imaging Sciences, King's College London, 5th Floor Becket House, Lambeth Palace Road, London, SE1 7EU, UK.
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17
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Itatani K, Sekine T, Yamagishi M, Maeda Y, Higashitani N, Miyazaki S, Matsuda J, Takehara Y. Hemodynamic Parameters for Cardiovascular System in 4D Flow MRI: Mathematical Definition and Clinical Applications. Magn Reson Med Sci 2022; 21:380-399. [PMID: 35173116 DOI: 10.2463/mrms.rev.2021-0097] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Blood flow imaging becomes an emerging trend in cardiology with the recent progress in computer technology. It not only visualizes colorful flow velocity streamlines but also quantifies the mechanical stress on cardiovascular structures; thus, it can provide the detailed inspections of the pathophysiology of diseases and predict the prognosis of cardiovascular functions. Clinical applications include the comprehensive assessment of hemodynamics and cardiac functions in echocardiography vector flow mapping (VFM), 4D flow MRI, and surgical planning as a simulation medicine in computational fluid dynamics (CFD).For evaluation of the hemodynamics, novel mathematically derived parameters obtained using measured velocity distributions are essential. Among them, the traditional and typical parameters are wall shear stress (WSS) and its related parameters. These parameters indicate the mechanical damages to endothelial cells, resulting in degenerative intimal change in vascular diseases. Apart from WSS, there are abundant parameters that describe the strength of the vortical and/or helical flow patterns. For instance, vorticity, enstrophy, and circulation indicate the rotating flow strength or power of 2D vortical flows. In addition, helicity, which is defined as the cross-linking number of the vortex filaments, indicates the 3D helical flow strength and adequately describes the turbulent flow in the aortic root in cases with complicated anatomies. For the description of turbulence caused by the diseased flow, there exist two types of parameters based on completely different concepts, namely: energy loss (EL) and turbulent kinetic energy (TKE). EL is the dissipated energy with blood viscosity and evaluates the cardiac workload related to the prognosis of heart failure. TKE describes the fluctuation in kinetic energy during turbulence, which describes the severity of the diseases that cause jet flow. These parameters are based on intuitive and clear physiological concepts, and are suitable for in vivo flow measurements using inner velocity profiles.
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Affiliation(s)
- Keiichi Itatani
- Department of Cardiovascular Surgery, Osaka City University.,Cardio Flow Design Inc
| | - Tetsuro Sekine
- Department of Radiology, Nippon Medical School Musashi Kosugi Hospital
| | - Masaaki Yamagishi
- Department of Pediatric Cardiovascular Surgery, Kyoto Prefectural University of Medicine
| | - Yoshinobu Maeda
- Department of Pediatric Cardiovascular Surgery, Kyoto Prefectural University of Medicine
| | - Norika Higashitani
- Cardio Flow Design Inc.,Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine
| | | | - Junya Matsuda
- Department of Cardiovascular Medicine, Nippon Medical School
| | - Yasuo Takehara
- Department of Fundamental Development for Advanced Low Invasive Diagnostic Imaging, Nagoya university Graduate School of Medicine
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18
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Shiina Y, Inai K, Nagao M. Non-physiological Aortic Flow and Aortopathy in Adult Patients with Transposition of the Great Arteries after the Jatene Procedure: A Pilot Study Using Echo Planar 4D Flow MRI. Magn Reson Med Sci 2021; 20:439-449. [PMID: 33551381 PMCID: PMC8922356 DOI: 10.2463/mrms.mp.2020-0101] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Purpose Dilated aortic root and ascending aorta (AAO) with progressive aortic regurgitation is a well-known sequela after arterial switch operation (ASO) in adults with transposition of the great arteries (TGA). We aimed to quantitatively assess aortic flow profiles in adults with TGA after ASO (Jatene procedure with LeCompte maneuver) using echo planar imaging (EPI) 4D flow MRI. Methods Prospectively, 9 consecutive adults (30.2 ± 6.6 years) after ASO (Jatene operation with LeCompte technique), 13 consecutive adults (34.3 ± 7.2 years) after the atrial switch operation with Senning procedure, and 8 age-matched control patients, who underwent turbo field echo (TFE) EPI 4D flow MRI (average scan time of approximately 4 min), were enrolled. Results TGA after ASO showed a markedly dilated sinus of Valsalva, compared to TGA after atrial switch operation (26.6. ± 4.9 vs. 18.6. ± 1.5 mm/cm2). Vorticity, helicity, wall share stress (WSS), and energy loss (EL) in the aortic root and the AAO in TGA were greater than in the controls. Vorticity, helicity, WSS, and EL in the aortic root and the AAO were also greater in TGA after ASO than after atrial switch operation. More acute aortic arch angle correlated with greater vorticity of the aortic root, and the significant diameter ratio of the sinus of Valsalva and the AAO was relevant to greater vorticity, helicity, and EL in TGA after ASO. Conclusion A non-physiological blood flow pattern of the aortic root was identified in TGA adults after the ASO (Jatene procedure with LeCompte maneuver). Missing spiral looping of the great arteries and the unique structure after the Jatene procedure may play an adjunctive role in promoting aortopathy. The evaluation of aortic flow profile using EPI 4D flow MRI may be useful for risk stratification for aortopathy in this population.
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Affiliation(s)
- Yumi Shiina
- Department of Pediatric Cardiology and Adult Congenital Cardiology, Tokyo Women's Medical University.,Cardiovascular Center, St. Luke's International Hospital
| | - Kei Inai
- Department of Pediatric Cardiology and Adult Congenital Cardiology, Tokyo Women's Medical University
| | - Michinobu Nagao
- Department of Diagnostic imaging & Nuclear Medicine, Tokyo Women's Medical University
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19
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Hu J, Liu J, Jiang Q, Zhu Y, Zhang W, Dong W, Zhang H. Influence of Surgical Methods on Hemodynamics in Supravalvular Aortic Stenosis: A Computational Hemodynamic Analysis. Pediatr Cardiol 2021; 42:1730-1739. [PMID: 34160653 DOI: 10.1007/s00246-021-02657-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 06/04/2021] [Indexed: 11/26/2022]
Abstract
We compared differences in the hemodynamic parameters of multiple surgical techniques for supravalvular aortic stenosis (SVAS). A three-dimensional model was reconstructed based on a patient's CT scan. Virtual McGoon, Doty, and Brom repairs were completed using computer-aided design (CAD). Hemodynamic parameters were calculated through computational fluid dynamics (CFD). The velocity profile and wall shear stress (WSS) showed the blood flow pattern. Energy loss (EL) and energy efficiency (EE) were calculated to estimate the cardiac workload. The perioperative blood flow ratio (BFR) of brachiocephalic vessels and coronary arteries was calculated. The preoperative flow velocity was abnormally high (> 5.0 m/s). High WSS was detected at the sinotubular junction (STJ), and its preoperative distribution in the aorta was uneven. High-speed flow disappeared after each of the three operations. The WSS distribution at the aortic root was consistent with the postoperative STJ structure of each operation. EL in the systolic phase decreased postoperatively (Original: 634 mW, McGoon: 218 mW, Doty: 278 mW, Brom: 255 mW). No significant difference in brachiocephalic BFR was detected among the different techniques. A slightly increased coronary BFR (Original: 7.56%, McGoon: 7.99%, Doty: 8.55%, Brom: 8.89%) was detected. McGoon, Doty, and Brom repair each effectively restored stable blood flow and greatly improved EE. The best WSS distribution and coronary blood supply were achieved after Brom repair due to its ability to reconstruct the symmetrical aortic root structure. CFD combined with a virtual operation is a promising method in surgical planning and optimization for SVAS.
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Affiliation(s)
- Jie Hu
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China
| | - Jinlong Liu
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China
| | - Qi Jiang
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China
| | - Yifan Zhu
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China
| | - Wen Zhang
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China
| | - Wei Dong
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China
| | - Haibo Zhang
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, 1678 Dongfang Road, Shanghai, China.
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20
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Sames-Dolzer E, Gierlinger G, Kreuzer M, Mair R, Gitter R, Prandstetter C, Tulzer G, Mair R. Aortic arch reconstruction in the Norwood procedure using a curved polytetrafluorethylene patch. Eur J Cardiothorac Surg 2021; 61:329-335. [PMID: 34662383 DOI: 10.1093/ejcts/ezab433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 08/22/2021] [Accepted: 08/28/2021] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES The aortic arch enlargement in the Norwood procedure is classically carried out using a curved homograft patch on the inner curvature of the neoaortic arch. The study investigates the outcome of a newly used artificial patch from a vascular prosthesis as an alternative to a homograft patch. METHODS Since April 2007, we used curved polytetrafluorethylene (PTFE) patches cut out of a prosthesis as an alternative to homograft patches for the aortic arch reconstruction. The decision for either patch material was made due to anatomic reasons, preferring PTFE patches in larger aortas. In this study, 224 Norwood patients, operated between April 2007 and April 2018, were analysed. A total of 104 patients received a PTFE patch (group PTFE), and 120 patients got a pulmonary homograft patch (group homograft). A single-centre retrospective analysis was carried out concerning postoperative course and long-term follow-up regarding aortic arch interventions and reoperations and comparing the 2 material groups. RESULTS There were no material associated operative or postoperative complications. In-hospital mortality was 13% in group PTFE. Six children died late during follow-up (6%). One aortic isthmus dilatation (1%) was carried out 12 months after the Norwood procedure in this group, no arch reoperation was necessary during the complete follow-up. CONCLUSIONS The curved PTFE patch showed good qualities in operative technical demands and excellent long-term results. In selected cases of hypoplastic left heart syndrome, it can be well used as alternative to the pulmonary homograft.
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Affiliation(s)
- Eva Sames-Dolzer
- Division of Pediatric and Congenital Heart Surgery, Kepler University Hospital, JKU, Linz, Austria.,Johannes Kepler University Linz, Medical Faculty, Altenberger Strasse 69, 4040 Linz, Austria
| | - Gregor Gierlinger
- Division of Pediatric and Congenital Heart Surgery, Kepler University Hospital, JKU, Linz, Austria.,Johannes Kepler University Linz, Medical Faculty, Altenberger Strasse 69, 4040 Linz, Austria
| | - Michaela Kreuzer
- Division of Pediatric and Congenital Heart Surgery, Kepler University Hospital, JKU, Linz, Austria.,Johannes Kepler University Linz, Medical Faculty, Altenberger Strasse 69, 4040 Linz, Austria
| | - Roland Mair
- Division of Pediatric and Congenital Heart Surgery, Kepler University Hospital, JKU, Linz, Austria
| | - Roland Gitter
- Department of Pediatric Cardiology, Kepler University Hospital, JKU, Linz, Austria
| | | | - Gerald Tulzer
- Department of Pediatric Cardiology, Kepler University Hospital, JKU, Linz, Austria
| | - Rudolf Mair
- Division of Pediatric and Congenital Heart Surgery, Kepler University Hospital, JKU, Linz, Austria
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21
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Qiao Y, Mao L, Ding Y, Zhu T, Luo K, Fan J. Fluid-structure interaction: Insights into biomechanical implications of endograft after thoracic endovascular aortic repair. Comput Biol Med 2021; 138:104882. [PMID: 34600328 DOI: 10.1016/j.compbiomed.2021.104882] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/04/2021] [Accepted: 09/19/2021] [Indexed: 10/20/2022]
Abstract
Thoracic endovascular aortic repair (TEVAR) has developed to be the most effective treatment for aortic diseases. This study aims to evaluate the biomechanical implications of the implanted endograft after TEVAR. We present a novel image-based, patient-specific, fluid-structure computational framework. The geometries of blood, endograft, and aortic wall were reconstructed based on clinical images. Patient-specific measurement data was collected to determine the parameters of the three-element Windkessel. We designed three postoperative scenarios with rigid wall assumption, blood-wall interaction, blood-endograft-wall interplay, respectively, where a two-way fluid-structure interaction (FSI) method was applied to predict the deformation of the composite stent-wall. Computational results were validated with Doppler ultrasound data. Results show that the rigid wall assumption fails to predict the waveforms of blood outflow and energy loss (EL). The complete storage and release process of blood flow energy, which consists of four phases is captured by the FSI method. The endograft implantation would weaken the buffer function of the aorta and reduce mean EL by 19.1%. The closed curve area of wall pressure and aortic volume could indicate the EL caused by the interaction between blood flow and wall deformation, which accounts for 68.8% of the total EL. Both the FSI and endograft have a slight effect on wall shear stress-related-indices. The deformability of the composite stent-wall region is remarkably limited by the endograft. Our results highlight the importance of considering the interaction between blood flow, the implanted endograft, and the aortic wall to acquire physiologically accurate hemodynamics in post-TEVAR computational studies and the deformation of the aortic wall is responsible for the major EL of the blood flow.
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Affiliation(s)
- Yonghui Qiao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
| | - Le Mao
- Department of Vascular Surgery, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Ying Ding
- Department of Radiology, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Ting Zhu
- Department of Vascular Surgery, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Kun Luo
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China.
| | - Jianren Fan
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China.
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22
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Sano S, Sano T, Kouretas PC. Reassessing our journey towards improved long-term outcomes in hypoplastic left heart syndrome: let's re-focus on the aortic arch. Eur J Cardiothorac Surg 2021; 60:1417-1418. [PMID: 34529772 DOI: 10.1093/ejcts/ezab244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Shunji Sano
- Division of Pediatric Cardio-thoracic Surgery, Department of Surgery, University California San Francisco, San Francisco, CA 94143, USA
| | - Toshikazu Sano
- Division of Pediatric Cardio-thoracic Surgery, Department of Surgery, University California San Francisco, San Francisco, CA 94143, USA
| | - Peter C Kouretas
- Division of Pediatric Cardio-thoracic Surgery, Department of Surgery, University California San Francisco, San Francisco, CA 94143, USA
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23
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Hemodynamic Analysis of a Three-Point Suture During Tapering Technique for Microanastomosis Using Computational Fluid Dynamics. J Craniofac Surg 2021; 32:2749-2752. [PMID: 34238882 PMCID: PMC8549452 DOI: 10.1097/scs.0000000000007859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The tapering technique is one of the useful methods of anastomosing 2 vessels with large discrepancies during microanastomoses. When the tapering technique is used, a three-point suture is always present. The authors analyzed the most appropriate suture technique for this using computational fluid dynamics. This aspect has not previously been addressed. Three different suture techniques were simulated:
Three single-knot sutures (Type I); Two single-knot sutures forming an X-shape (Type II); and A single continuous ligature through the vascular wall (Type III).
Vascular models of these 3 types were created. The streamline, wall shear stress, and oscillatory shear index at the anastomosis site were measured using a previously prepared venous model. Streamline disruption was most severe for Type II. In all 3 types, the highest wall shear stress was recorded at the suture peak protruding into the vessel. The maximum oscillatory shear index was highest in Type II, and lowest in Type III. The present results suggest that Type III is the best three-point suturing method for the tapering technique.
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Kobayashi Y, Kotani Y, Kawabata T, Kuroko Y, Sano S, Kasahara S. Does the size of pulmonary artery impact on recoarctation of the aorta after the Norwood procedure without patch? Interact Cardiovasc Thorac Surg 2021; 33:765-772. [PMID: 34164672 DOI: 10.1093/icvts/ivab170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 05/01/2021] [Accepted: 05/12/2021] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES This study aimed to evaluate whether recoarctation of the aorta (reCoA) after the Norwood procedure for hypoplastic left heart syndrome correlates with pre- and postoperative anatomic factors. METHODS This retrospective study included 48 patients who underwent Norwood procedure with right ventricle-to-pulmonary artery conduit between 2009 and 2017. Anatomical factors such as preoperative length, diameter of the main pulmonary artery (MPA), and postoperative neoaortic arch angle stratified by arch reconstruction technique were analysed using the receiver operating characteristic analysis. RESULTS Eleven patients needed surgical intervention for reCoA at stage 2. Out of the 30 patients who underwent direct anastomosis during arch reconstruction, 7 developed reCoA. Seven patients received the full patch augmentation (patch augmentation for both lesser and greater curvatures) and were all spared from reCoA. Among the patients who had direct anastomosis, the preoperative MPA length was correlated with the postoperative arch angle (P = 0.021) and was associated with the occurrence of reCoA (P = 0.002) and the best cutoff value for MPA length was 10 mm. The postoperative arch angle was also correlated with the incidence of reCoA (P < 0.001) and was larger in patients who underwent the full patch augmentation than in patients who had direct anastomosis (126° vs 112°, P = 0.005) despite comparable MPA length. CONCLUSIONS ReCoA after the Norwood procedure correlates with MPA length when a direct anastomosis was used. Direct anastomosis can be considered in patients with a longer preoperative MPA. In other cases, the full patch augmentation should be considered for obtaining a large and smooth neoaortic arch.
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Affiliation(s)
- Yasuyuki Kobayashi
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| | - Yasuhiro Kotani
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| | - Takuya Kawabata
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| | - Yosuke Kuroko
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| | - Shunji Sano
- Department of Pediatric Cardiothoracic Surgery, University of California, San Francisco, CA, USA
| | - Shingo Kasahara
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
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Ascending aortic extension to enlarge the retroaortic space in children after the Norwood procedure. Gen Thorac Cardiovasc Surg 2021; 69:1129-1132. [PMID: 34033006 DOI: 10.1007/s11748-021-01618-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 03/02/2021] [Indexed: 10/21/2022]
Abstract
Left pulmonary artery stenosis is a well-recognized complication following the Norwood procedure. We herein report two cases in which ascending aortic extension was performed to enlarge the retroaortic space in children with left pulmonary artery stenosis after the Norwood procedure. We used graft interposition in the ascending aorta to increase the retroaortic apace and concomitantly performed extended left pulmonary artery reconstruction. This procedure obtains a more balanced distribution of the pulmonary blood flow, which is crucial to achieve good Fontan circulation.
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Primeaux J, Salavitabar A, Lu JC, Grifka RG, Figueroa CA. Characterization of Post-Operative Hemodynamics Following the Norwood Procedure Using Population Data and Multi-Scale Modeling. Front Physiol 2021; 12:603040. [PMID: 34054563 PMCID: PMC8155503 DOI: 10.3389/fphys.2021.603040] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 04/19/2021] [Indexed: 11/22/2022] Open
Abstract
Children with hypoplastic left heart syndrome (HLHS) must undergo multiple surgical stages to reconstruct the anatomy to a sustainable single ventricle system. Stage I palliation, or the Norwood procedure, provides circulation to both pulmonary and systemic vasculature. The aorta is reconstructed and attached to the right ventricle and a fraction of systemic flow is redirected to the pulmonary arteries (PAs) through a systemic-to-PA shunt. Despite abundant hemodynamic data available 4-5 months after Norwood palliation, data is very scarce immediately following stage I. This data is critical in determining post-operative success. In this work, we combined population data and computational fluid dynamics (CFD) to characterize hemodynamics immediately following stage I (post-stage I) and prior to stage II palliation (pre-stage II). A patient-specific model was constructed as a baseline geometry, which was then scaled to reflect population-based morphological data at both time-points. Population-based hemodynamic data was then used to calibrate each model to reproduce blood flow representative of HLHS patients. The post-stage I simulation produced a PA pressure of 22 mmHg and high-frequency oscillations within the flow field indicating highly disturbed hemodynamics. Despite PA mean pressure dropping to 14 mmHg, the pre-stage II model also produced high-frequency flow components and PA wall shear stress increases. These suboptimal conditions may be necessary to ensure adequate PA flow throughout the pre-stage II period, as the shunt becomes relatively smaller compared to the patient's somatic growth. In the future, CFD can be used to optimize shunt design and minimize these suboptimal conditions.
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Affiliation(s)
- Jonathan Primeaux
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States
| | - Arash Salavitabar
- C.S. Mott Children’s Hospital, University of Michigan Congenital Heart Center, Ann Arbor, MI, United States
| | - Jimmy C. Lu
- C.S. Mott Children’s Hospital, University of Michigan Congenital Heart Center, Ann Arbor, MI, United States
| | | | - C. Alberto Figueroa
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
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Sasaki T, Ueda H, Itatani K, Suzuki K, Kurita J, Sakamoto SI, Miyagi Y, Ishii Y, Morota T, Nitta T. Computational fluid dynamics simulations of flow distribution and graft designs in apicoaortic bypass. Gen Thorac Cardiovasc Surg 2021; 69:811-818. [PMID: 33125595 DOI: 10.1007/s11748-020-01527-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 10/16/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Apicoaortic bypass has double outlets and its graft design is similar to that of a left ventricular assist device (LVAD). The left ventricular apex to the descending aorta (LV-DsAo) bypass is widely used in apicoaortic bypass. In contrast, the left ventricular apex to the ascending aorta (LV-AsAo) bypass is standard in LVAD surgery. This study aimed to evaluate the graft designs of apicoaortic bypass and their effects on flow distribution and energy loss (EL). METHODS A simulation study using computational fluid dynamics was performed on the geometry and hemodynamics data obtained from a 30-year-old patient who underwent a LV-DsAo bypass. The ratio of the cardiac output (CO) through the ascending aorta (AsAo) and apicoaortic conduit was set at 50:50, 30:70, and 10:90. Regional blood flow (RBF) and EL were calculated for the different distribution ratios. As an alternative to the LV-DsAo bypass, a virtual LV-AsAo bypass surgery was performed, and each parameter was compared with that of the LV-DsAo bypass. RESULTS At a distribution ratio of 50:50, the RBF to the head and EL were 16.4% of the total CO and 62.0 mW in the LV-DsAo bypass, and 32.3% and 81.5 mW in the LV-AsAo bypass, respectively. The RBF to the head decreased with the CO through the AsAo in the LV-DsAo bypass, but it was constant in the LV-AsAo bypass. The EL increased inversely with the CO through the AsAo in both graft designs. CONCLUSION The regional blood flow distribution was different, but the trend of the EL which increased inversely with the CO through the AsAo was similar between the LV-DsAo and LV-AsAo bypasses.
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Affiliation(s)
- Takashi Sasaki
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan.
| | - Hitomi Ueda
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kenji Suzuki
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Jiro Kurita
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Shun-Ichiro Sakamoto
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Yasuo Miyagi
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Yosuke Ishii
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Tetsuro Morota
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
| | - Takashi Nitta
- Department of Cardiovascular Surgery, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan
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Evaluation of left ventricular function by vector flow mapping in females with systemic lupus erythematosus. Clin Rheumatol 2021; 40:4049-4060. [PMID: 33903978 DOI: 10.1007/s10067-021-05747-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/04/2021] [Accepted: 04/19/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES Compare the intraventricular hemodynamics of 60 females with systemic lupus erythematosus (SLE) and 61 healthy female controls, and determine cardiac function changes using vector flow mapping (VFM). METHODS To determine the effect of pulmonary artery pressure changes on left ventricular function, SLE patients were divided into a normal pulmonary artery pressure group (S1, n=24) and an elevated pulmonary artery pressure group (S2, n=36). The energy loss (EL) at each segment of the left ventricular chamber (total, basal, middle, and apical segments) during each period of the cardiac cycle (isovolumic contraction, rapid ejection, rapid filling, reduced filling, atrial contraction) was determined. RESULTS The S1 group had significantly more vortices than the control group during the rapid ejection, rapid filling, and atrial contraction periods (p<0.01), and the maximum vortex areas in the S1 and S2 groups were smaller than in the control group during rapid filling and atrial contraction periods (p<0.05). Compared with the control group, the S2 group had greater EL during the systole and diastole periods (p<0.01). EL in the S1 group was significantly greater than in the control group during systole (p<0.01). During the rapid filling period, the EL was positively correlated with septal E' (r=0.784, p<0.01), and during the atrial contraction period, EL was positively correlated with septal E/e' (r=0.812, p<0.01) and A (r=0.715, p<0.01). CONCLUSION VFM of patients with SLE can comprehensively, rapidly, and efficiently evaluate changes of myocardial mechanics and intracardiac hemodynamics and provide quantitative analysis of complex intracardiac blood flow. Key points • Vector flow mapping (VFM) is a new non-invasive ultrasound technique that evaluates changes of myocardial mechanics and intracardiac hemodynamics, and provides quantitative analysis of complex intracardiac blood flow. • This study showed that vortex and energy loss may provide more sensitive detection of cardiac dysfunction than conventional echocardiographic indexes in patients with systemic lupus erythematosus.
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Asada S, Yamagishi M, Maeda Y, Itatani K, Fujita S, Hongu H, Nakatsuji H, Yaku H. Chimney reconstruction provides a wider subaortic space and reduces the risk of pulmonary artery compression in the Norwood-type aortic arch reconstruction without patch supplementation. Eur J Cardiothorac Surg 2021; 60:1408-1416. [PMID: 33890109 DOI: 10.1093/ejcts/ezab184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 03/01/2021] [Accepted: 03/09/2021] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Pulmonary artery (PA) compression by the neoaorta is a serious complication after the Norwood-type palliation (NP) for hypoplastic left heart syndrome. Either excess patch tailoring or limited use of autologous tissue may cause narrowing of the subaortic space. The chimney technique could theoretically provide a wide subaortic space. METHODS Twenty-nine patients with both pre- and post-NP computed tomography data available of the 37 consecutive patients who underwent NP in our institution were reviewed. Arch height, arch width, sinus of Valsalva diameter, area under the neoaortic arch and arch angle were measured. These patients were divided according to the neo-arch reconstruction technique, chimney reconstruction technique (CR) or conventional direct reconstruction technique (DR). RESULTS Median age and weight at NP were 2.1 months and 3.5 kg, respectively. Twenty-two patients underwent previous bilateral PA banding. During NP, 17 CR and 12 DR were performed. Four patients in the DR group developed PA compression. No neoaortic arch dilatation was found in either group. Post-NP arch width, area under the neo-arch and the arch angle were significantly larger in the CR group. Pre-NP arch height was significantly smaller in DR patients with PA compression than in those without. CONCLUSIONS The chimney technique decreased the risk of PA compression and provided a wider subaortic space and a less acute arch angle. This technique had no short-term effect on the neoaortic root. Small preoperative arch height is a potential risk factor for PA compression in DR, and the chimney technique could be an effective solution.
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Affiliation(s)
- Satoshi Asada
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masaaki Yamagishi
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshinobu Maeda
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Keiichi Itatani
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Shuhei Fujita
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hisayuki Hongu
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hiroki Nakatsuji
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hitoshi Yaku
- Division of Cardiovascular Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Yoo SJ, Hussein N, Peel B, Coles J, van Arsdell GS, Honjo O, Haller C, Lam CZ, Seed M, Barron D. 3D Modeling and Printing in Congenital Heart Surgery: Entering the Stage of Maturation. Front Pediatr 2021; 9:621672. [PMID: 33614554 PMCID: PMC7892770 DOI: 10.3389/fped.2021.621672] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 01/06/2021] [Indexed: 12/05/2022] Open
Abstract
3D printing allows the most realistic perception of the surgical anatomy of congenital heart diseases without the requirement of physical devices such as a computer screen or virtual headset. It is useful for surgical decision making and simulation, hands-on surgical training (HOST) and cardiovascular morphology teaching. 3D-printed models allow easy understanding of surgical morphology and preoperative surgical simulation. The most common indications for its clinical use include complex forms of double outlet right ventricle and transposition of the great arteries, anomalous systemic and pulmonary venous connections, and heterotaxy. Its utility in congenital heart surgery is indisputable, although it is hard to "scientifically" prove the impact of its use in surgery because of many confounding factors that contribute to the surgical outcome. 3D-printed models are valuable resources for morphology teaching. Educational models can be produced for almost all different variations of congenital heart diseases, and replicated in any number. HOST using 3D-printed models enables efficient education of surgeons in-training. Implementation of the HOST courses in congenital heart surgical training programs is not an option but an absolute necessity. In conclusion, 3D printing is entering the stage of maturation in its use for congenital heart surgery. It is now time for imagers and surgeons to find how to effectively utilize 3D printing and how to improve the quality of the products for improved patient outcomes and impact of education and training.
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Affiliation(s)
- Shi Joon Yoo
- Department of Diagnostic Imaging, The University of Toronto, Toronto, ON, Canada
- Department of Paediatrics–Division of Cardiology, The University of Toronto, Toronto, ON, Canada
- Center for Image Guided Innovation and Therapeutic Intervention, The University of Toronto, Toronto, ON, Canada
| | - Nabil Hussein
- Center for Image Guided Innovation and Therapeutic Intervention, The University of Toronto, Toronto, ON, Canada
- Department of Surgery-Division of Cardiovascular Surgery, Hospital for Sick Children, The University of Toronto, Toronto, ON, Canada
| | - Brandon Peel
- Center for Image Guided Innovation and Therapeutic Intervention, The University of Toronto, Toronto, ON, Canada
| | - John Coles
- Department of Surgery-Division of Cardiovascular Surgery, Hospital for Sick Children, The University of Toronto, Toronto, ON, Canada
| | - Glen S. van Arsdell
- Department of Surgery, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA, United States
- Department of Surgery, Mattel Children's Hospital at UCLA, Los Angeles, CA, United States
| | - Osami Honjo
- Department of Surgery-Division of Cardiovascular Surgery, Hospital for Sick Children, The University of Toronto, Toronto, ON, Canada
| | - Christoph Haller
- Department of Surgery-Division of Cardiovascular Surgery, Hospital for Sick Children, The University of Toronto, Toronto, ON, Canada
| | - Christopher Z. Lam
- Department of Diagnostic Imaging, The University of Toronto, Toronto, ON, Canada
| | - Mike Seed
- Department of Diagnostic Imaging, The University of Toronto, Toronto, ON, Canada
- Department of Paediatrics–Division of Cardiology, The University of Toronto, Toronto, ON, Canada
| | - David Barron
- Department of Surgery-Division of Cardiovascular Surgery, Hospital for Sick Children, The University of Toronto, Toronto, ON, Canada
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High-degree Norwood neoaortic tapering is associated with abnormal flow conduction and elevated flow-mediated energy loss. J Thorac Cardiovasc Surg 2021; 162:1791-1804. [PMID: 33653609 DOI: 10.1016/j.jtcvs.2021.01.111] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 01/14/2021] [Accepted: 01/25/2021] [Indexed: 11/20/2022]
Abstract
OBJECTIVE The Norwood neoaortic arch biomechanical properties are abnormal due to reduced vessel wall compliance and abnormal geometry. Others have previously described neoaortic geometric distortion by the degree of diameter reduction (tapering) and associated this with mismatched ventricular-neoaortic coupling, abnormal flow hemodynamic parameters, and worse patient outcome. Our purposes were to investigate the influence of neoaortic tapering (ie, diameter reduction) on flow-mediated viscous energy loss (EL') in post-Norwood palliated hypoplastic left heart syndrome patients, and correlate flow-geometry with single ventricle power generation. METHODS Twenty-six palliated hypoplastic left heart syndrome patients underwent comprehensive cardiac evaluation with 4-dimensional-flow magnetic resonance imaging. Patients were grouped into high- (group H, n = 13) and low- (group L, n = 13) degree neoaortic tapering using the median cutoff value of neoaortic diameter variance. EL' was calculated along standardized segments using 4-dimensional-flow magnetic resonance imaging. Flow-mediated power loss as a percentage of total power generated by the single ventricle was determined. RESULTS Group H had a higher prevalence of abnormal recirculating flow in the neoaorta and elevated neoaortic EL' in the ascending aorta (1.0 vs 0.6 mW; P = .004). Group H EL' was increased across the entire thoracic aorta (2.6 vs 1.3 mW; P = .002) and accounted for 0.7% of generated ventricular power versus 0.3% in group L (P = .024). EL' directly correlated with the degree of ascending aortic dilation (R = 0.49; P = .012). CONCLUSIONS Patients with high degree neoaortic tapering have more perturbed flow through the neoaorta and increased EL'. Flow-mediated energy loss due to abnormal flow represents irreversibly wasted power generated by the single right ventricle. In patients with high-degree neoaortic tapering, EL' was more than 2-fold greater than low-degree tapering patients. These data suggest that oversizing the Norwood neoaortic reconstruction should be avoided and that patients with distorted neoaortic geometry may warrant increased surveillance for single-ventricle deterioration.
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Yagi S, Sasaki T, Fukuhara T, Fujii K, Morita M, Suyama Y, Fukuoka K, Nishino T, Hisatome I. Hemodynamic Analysis of a Microanastomosis Using Computational Fluid Dynamics. Yonago Acta Med 2020; 63:308-312. [PMID: 33253341 DOI: 10.33160/yam.2020.11.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 10/14/2020] [Indexed: 12/26/2022]
Abstract
Background Technical issues in free flap transfer, such as the selection of recipient vessels and the positioning and method of anastomosis of the vascular pedicle, have been the subject of vigorous debate. Recent developments in computational fluid dynamics (CFD) have enabled the analysis of blood flow within microvessels. In this study, CFD was used to analyze hemodynamics in a microanastomosis. Methods In the fluid calculation process, the fluid domain modelizes microvessels with anastomosis. The inlet flow conditions were measured as venous waveform, and the fluid is simulated as blood. Streamlines (SL), wall shear stress (WSS), and oscillatory shear index (OSI) at the anastomosis were visualized and analyzed for observing effects from the flow field. Results Some flow disruption was evident as the SL passed over the sutures. The maximum recorded WSS was 13.37 Pa where the peak of a suture was exposed in the lumen. The local maximum value of the OSI was 0.182, recorded at the base of the anastomosis on the outflow side. Conclusion In the ideal anastomosis, the SL is disrupted as little as possible by the sutures. The WSS indicated that thrombus formation is unlikely to occur at suture peaks, but more likely to occur at the base of sutures, where the OSI is high. Tight suture knots are important in microanastomosis.
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Affiliation(s)
- Shunjiro Yagi
- Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan
| | | | - Takahiro Fukuhara
- Division of Otolaryngology, Head and Neck Surgery, Department of Sensory and Motor Organs, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - Kaori Fujii
- Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan
| | - Maki Morita
- Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan
| | - Yoshiko Suyama
- Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan
| | - Kohei Fukuoka
- Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan
| | | | - Ichiro Hisatome
- Department of Genetic Medicine and Regenerative Therapeutics, Graduate School of Medical Sciences, Tottori University, Yonago 683-8503, Japan
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Kanzaki T, Numata S, Yamazaki S, Ikemoto K, Hohri Y, Yaku H, Itatani K, Nakajma S, Takahashi A. Computational fluid dynamics of internal mammary artery-left anterior descending artery anastomoses. Interact Cardiovasc Thorac Surg 2020; 31:611-617. [PMID: 33137825 DOI: 10.1093/icvts/ivaa183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 07/01/2020] [Accepted: 07/20/2020] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The aim of this study was to elucidate the remodelling of the internal mammary artery (IMA)-left anterior descending artery anastomosis and compare 2 different anastomosis techniques (end-to-side versus side-to-side) using computational fluid dynamics. METHODS This study included 9 patients. Computed tomography (CT) angiography was performed immediately after coronary artery bypass grafting (CABG) and at 3-6 months later. The computational fluid dynamics models were made using the CT data. The pulsatile 3-dimensional blood flow was achieved with the finite volume method to evaluate the postoperative morphological and haemodynamic changes at the anastomosis in each patient. Flow velocity distribution, wall shear stress (WSS) and its fluctuation oscillatory shear index were measured. RESULTS No early or mid-term graft occlusion was observed in the study series. In the side-to-side anastomosis, pouch formation at the distal end of IMA caused a vortex flow with low WSS immediately after CABG. However, at 3-6 months after surgery, this pouch disappeared. As a result, the laminar straight flow with uniform WSS distribution was achieved inside the anastomosis. In the end-to-side anastomosis, the anastomosis shape was remodelled, resulting in a laminar flow pattern with uniform WSS distribution. A patchy high oscillatory shear index was detected at the IMA wall on the top of anastomosis in either anastomosis techniques immediately after the surgery, but it disappeared at 3-6 months after surgery. CONCLUSIONS Regardless of the anastomosis technique used, a successful remodelling of the IMA-left anterior descending artery anastomosis shape was achieved a few months after surgery, resulting in a straightforward flow streamline, with uniform WSS distribution and minimal oscillatory shear index.
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Affiliation(s)
- Tomohito Kanzaki
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoshi Numata
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Sachiko Yamazaki
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Koki Ikemoto
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yu Hohri
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hitoshi Yaku
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Cardiovascular Imaging Research Laboratory, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Shunsuke Nakajma
- Department of Cardiology, Sakurakai Takahashi Hospital, Hyogo, Japan
| | - Akihiko Takahashi
- Department of Cardiology, Sakurakai Takahashi Hospital, Hyogo, Japan
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Gerrah R, Haller SJ. Computational fluid dynamics: a primer for congenital heart disease clinicians. Asian Cardiovasc Thorac Ann 2020; 28:520-532. [PMID: 32878458 DOI: 10.1177/0218492320957163] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Computational fluid dynamics has become an important tool for studying blood flow dynamics. As an in-silico collection of methods, computational fluid dynamics is noninvasive and provides numerical values for the most important parameters of blood flow, such as velocity and pressure that are crucial in hemodynamic studies. In this primer, we briefly explain the basic theory and workflow of the two most commonly applied computational fluid dynamics techniques used in the congenital heart disease literature: the finite element method and the finite volume method. We define important terminology and include specific examples of how using these methods can answer important clinical questions in congenital cardiac surgery planning and perioperative patient management.
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Affiliation(s)
- Rabin Gerrah
- Stanford University, Samaritan Cardiovascular Surgery, Corvallis, OR, USA
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Alphonso N, Angelini A, Barron DJ, Bellsham-Revell H, Blom NA, Brown K, Davis D, Duncan D, Fedrigo M, Galletti L, Hehir D, Herberg U, Jacobs JP, Januszewska K, Karl TR, Malec E, Maruszewski B, Montgomerie J, Pizzaro C, Schranz D, Shillingford AJ, Simpson JM. Guidelines for the management of neonates and infants with hypoplastic left heart syndrome: The European Association for Cardio-Thoracic Surgery (EACTS) and the Association for European Paediatric and Congenital Cardiology (AEPC) Hypoplastic Left Heart Syndrome Guidelines Task Force. Eur J Cardiothorac Surg 2020; 58:416-499. [DOI: 10.1093/ejcts/ezaa188] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Nelson Alphonso
- Queensland Pediatric Cardiac Service, Queensland Children’s Hospital, University of Queensland, Brisbane, QLD, Australia
| | - Annalisa Angelini
- Department of Cardiac, Thoracic Vascular Sciences and Public health, University of Padua Medical School, Padua, Italy
| | - David J Barron
- Department of Cardiovascular Surgery, Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | | | - Nico A Blom
- Division of Pediatric Cardiology, Department of Pediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - Katherine Brown
- Paediatric Intensive Care, Heart and Lung Division, Great Ormond Street Hospital NHS Foundation Trust, London, UK
| | - Deborah Davis
- Department of Anesthesiology, Thomas Jefferson University, Philadelphia, PA, USA
- Nemours Cardiac Center, A.I. Du Pont Hospital for Children, Wilmington, DE, USA
| | - Daniel Duncan
- Nemours Cardiac Center, A.I. Du Pont Hospital for Children, Wilmington, DE, USA
| | - Marny Fedrigo
- Department of Cardiac, Thoracic Vascular Sciences and Public Health, University of Padua Medical School, Padua, Italy
| | - Lorenzo Galletti
- Unit of Pediatric Cardiac Surgery, Bambino Gesù Children's Hospital, Rome, Italy
| | - David Hehir
- Division of Cardiology, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - Ulrike Herberg
- Department of Pediatric Cardiology, University Hospital Bonn, Bonn, Germany
| | | | - Katarzyna Januszewska
- Division of Pediatric Cardiac Surgery, University Hospital Muenster, Westphalian-Wilhelm’s-University, Muenster, Germany
| | | | - Edward Malec
- Division of Pediatric Cardiac Surgery, University Hospital Muenster, Westphalian-Wilhelm’s-University, Muenster, Germany
| | - Bohdan Maruszewski
- Department for Pediatric Cardiothoracic Surgery, Children's Memorial Health Institute, Warsaw, Poland
| | - James Montgomerie
- Department of Anesthesia, Birmingham Children’s Hospital, Birmingham, UK
| | - Christian Pizzaro
- Nemours Cardiac Center, A.I. Du Pont Hospital for Children, Wilmington, DE, USA
- Department of Surgery, Thomas Jefferson University, Philadelphia, PA, USA
| | - Dietmar Schranz
- Pediatric Heart Center, Justus-Liebig University, Giessen, Germany
| | - Amanda J Shillingford
- Division of Cardiology, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
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Yoshida S, Toda K, Miyagawa S, Yoshikawa Y, Hata H, Yoshioka D, Kainuma S, Kawamura T, Kawamura A, Nakatani S, Sawa Y. Impact of turbulent blood flow in the aortic root on de novo aortic insufficiency during continuous‐flow left ventricular‐assist device support. Artif Organs 2020; 44:883-891. [DOI: 10.1111/aor.13671] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 01/13/2020] [Accepted: 02/12/2020] [Indexed: 01/18/2023]
Affiliation(s)
| | - Koichi Toda
- Cardiovascular Surgery Osaka University Suita Japan
| | | | | | - Hiroki Hata
- Cardiovascular Surgery Osaka University Suita Japan
| | | | | | | | - Ai Kawamura
- Cardiovascular Surgery Osaka University Suita Japan
| | | | - Yoshiki Sawa
- Cardiovascular Surgery Osaka University Suita Japan
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Kainuma A, Akiyama K, Naito Y, Hayase K, Hongu H, Itatani K, Yamagishi M, Sawa T. Energetic performance index improvement after Glenn and Damus-Kaye-Stansel procedure using vector flow mapping analysis: a case report. JA Clin Rep 2020; 6:5. [PMID: 32026035 PMCID: PMC6973790 DOI: 10.1186/s40981-020-0312-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 01/14/2020] [Indexed: 11/30/2022] Open
Abstract
Background Echocardiography vector flow mapping can assess dynamic flow to treat congenital heart diseases. We evaluated intracardiac flow, energy loss, left ventricular output kinetic energy, and energetic performance index using vector flow mapping during Glenn and Damus-Kaye-Stansel procedures in order to assess the efficacy of the surgery. Case presentation A 9-month-old boy underwent Glenn and Damus-Kaye-Stansel procedures. The energy loss depends on the left ventricular preload; therefore, energy loss decreased after the Glenn procedure. After the Damus-Kaye-Stansel procedure, the kinetic energy would increase owing to the integrated systemic outflow; however, in our case, kinetic energy decreased, which was potentially explained by the fact that kinetic energy also depends on the left ventricular preload. After the Glenn and Damus-Kaye-Stansel procedures, we detected an improvement in energetic performance index, indicating that the cardiac workload improved as well. Conclusion We revealed the efficiency of the Glenn and Damus-Kaye-Stansel procedures using vector flow mapping.
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Affiliation(s)
- Atsushi Kainuma
- Department of Anesthesiology, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyoku, Kyoto, 602-8566, Japan.
| | - Koichi Akiyama
- Department of Anesthesiology, Yodogawa Christian Hospital, 1 Chome-7-50, Kunijima, Higashiyodogawa Ward, Osaka, 533-0024, Japan
| | - Yoshifumi Naito
- Department of Anesthesia and Perioperative care, University of California San Francisco, 505 Parnassus Ave, San Francisco, CA, 94143, USA
| | - Kazuma Hayase
- Department of Anesthesiology, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyoku, Kyoto, 602-8566, Japan
| | - Hisayuki Hongu
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyoku, Kyoto, 602-8566, Japan
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyoku, Kyoto, 602-8566, Japan
| | - Masaaki Yamagishi
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyoku, Kyoto, 602-8566, Japan
| | - Teiji Sawa
- Department of Anesthesiology, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyoku, Kyoto, 602-8566, Japan
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Miyaji K, Miyazaki S, Itatani K, Oka N, Kitamura T, Horai T. Novel surgical strategy for complicated pulmonary stenosis using haemodynamic analysis based on a virtual operation with numerical flow analysis. Interact Cardiovasc Thorac Surg 2020; 28:775-782. [PMID: 30535379 DOI: 10.1093/icvts/ivy326] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 10/13/2018] [Accepted: 10/16/2018] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES A novel surgical strategy using haemodynamic analyses based on virtual operations with computational simulations has been introduced for complicated pulmonary stenosis. We evaluated the efficacy of this strategy. METHODS Six patients were enrolled. Before surgery, the optimal pulmonary arteries were constructed based on computational fluid dynamics using 3-dimensional computed tomography. Energy loss (EL, mW) and wall shear stress (WSS, Pa) were calculated. We compared the shapes of preoperative and optimal pulmonary arteries to determine the surgical strategy, including the incision line and the shape of the patch (virtual surgery). EL and WSS were compared between virtual and actual surgeries using flow analysis. RESULTS In both the virtual and actual surgeries, postoperative EL tended to be lower than the preoperative EL, although there were no significant differences (P = 0.12 and P = 0.17, respectively). The mean WSS in the virtual surgery was significantly reduced from 112 ± 130 Pa to 25 ± 24 Pa (P = 0.028). After the actual surgery, the mean WSS was also significantly reduced to 30 ± 23 Pa (P = 0.047). There were no significant differences in the values for EL and WSS before and after surgery or between virtual and actual surgery (P = 0.94 and P = 0.85, respectively). CONCLUSIONS Pulmonary artery plasty, using computational fluid dynamics based on virtual surgery, is an efficient surgical strategy. This novel strategy can easily and successfully provide an optimal pulmonary artery plasty equivalent to that using the conventional approach, which is based on the surgeon's personal experience and judgement.
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Affiliation(s)
- Kagami Miyaji
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Shohei Miyazaki
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto City, Kyoto, Japan
| | - Norihiko Oka
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Tadashi Kitamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Tetsuya Horai
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
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Asada S, Yamagishi M, Itatani K, Maeda Y, Taniguchi S, Fujita S, Hongu H, Yaku H. Early outcomes and computational fluid dynamic analyses of chimney reconstruction in the Norwood procedure†. Interact Cardiovasc Thorac Surg 2019; 29:252–259. [PMID: 30879071 DOI: 10.1093/icvts/ivz040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Revised: 02/01/2019] [Accepted: 02/03/2019] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The ideal configuration of a reconstructed aortic arch in the Norwood procedure for hypoplastic left heart syndrome is still a matter of debate. Chimney reconstruction was developed to avoid postoperative complications and turbulent flow in the aortic arch. This study sought to clarify early outcomes of the procedure and verify its haemodynamic advantages using computational fluid dynamics (CFD). METHODS Fourteen consecutive patients with hypoplastic left heart syndrome or a variant who underwent chimney reconstruction in the Norwood procedure between January 2013 and March 2018 were enrolled. Median age and body weight at the time of operation were 2.5 months and 4.1 kg, respectively. Thirteen patients (93.9%) had been palliated with previous bilateral pulmonary artery (PA) banding. In addition, patient-specific CFD models of neoarches based on postoperative computed tomograms from 6 patients were created and the flow profiles analysed. RESULTS Survival rates at 1, 3 and 5 years were 76.6%, 67.3% and 67.3%, respectively. No patient developed left PA compression by neoaorta, neoaortic dilation or neoaortic insufficiency. Only 2 patients (14.3%) required surgical intervention for recoarctation. Fontan completion was performed on 5 patients. On CFD analysis, all reconstructed aortic arches showed low energy loss (9.16-14.4 mW/m2) and low wall shear stresses. CONCLUSIONS Chimney reconstruction was a feasible technique when homografts were not readily available. CFD analyses underscored the fact that this technique produced excellent flow profiles. Larger studies should be conducted to clarify long-term outcomes.
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Affiliation(s)
- Satoshi Asada
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masaaki Yamagishi
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Keiichi Itatani
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshinobu Maeda
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoshi Taniguchi
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Shuhei Fujita
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hisayuki Hongu
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hitoshi Yaku
- Division of Cardiovascular Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Qiao Y, Fan J, Ding Y, Zhu T, Luo K. A Primary Computational Fluid Dynamics Study of Pre- and Post-TEVAR With Intentional Left Subclavian Artery Coverage in a Type B Aortic Dissection. J Biomech Eng 2019; 141:2735390. [DOI: 10.1115/1.4043881] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Indexed: 11/08/2022]
Abstract
The impact of left subclavian artery (LSA) coverage during thoracic endovascular aortic repair (TEVAR) on the circulatory system is not fully understood. Here, we coupled a single-phase non-Newtonian model with fluid–structure interaction (FSI) technique to simulate blood flow in an acute type B aortic dissection. Three-element Windkessel model was implemented to reproduce physiological pressure waves, where a new workflow was designed to determine model parameters with the absence of measured data. Simulations were carried out in three geometric models to demonstrate the consequence of TEVAR with the LSA coverage; case A: pre-TEVAR aorta; case B: post-TEVAR aorta with the disappearance of LSA; case C: post-TEVAR aorta with virtually adding LSA. Results show that the blood flow through the compressed true lumen is only 8.43%, which may lead to ischemia in related organs. After TEVAR, the wall pressure on the stented segment increases and blood flow in the supra-aortic branches and true lumen is improved. Meantime, the average deformation of the aorta is obviously reduced due to the implantation of the stent graft. After virtually adding LSA, significant changes in the distribution of blood flow and two indices based on wall shear stress are observed. Moreover, the movement of residual false lumen becomes stable, which could contribute to patient recovery. Overall, this study quantitatively evaluates the efficacy of TEVAR for acute type B aortic dissection and demonstrates that the coverage of LSA has a considerable impact on the important hemodynamic parameters.
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Affiliation(s)
- Yonghui Qiao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China e-mail:
| | - Jianren Fan
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China e-mail:
| | - Ying Ding
- Department of Radiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai 200032, China e-mail:
| | - Ting Zhu
- Department of Vascular Surgery, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai 200032, China e-mail:
| | - Kun Luo
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China e-mail:
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Ishii M, Kaikita K, Mitsuse T, Nakanishi N, Oimatsu Y, Yamashita T, Nagamatsu S, Tabata N, Fujisue K, Sueta D, Takashio S, Arima Y, Sakamoto K, Yamamoto E, Tsujita K. Reduction in thrombogenic activity and thrombocytopenia after transcatheter aortic valve implantation - The ATTRACTIVE-TTAS study. IJC HEART & VASCULATURE 2019; 23:100346. [PMID: 30976651 PMCID: PMC6441766 DOI: 10.1016/j.ijcha.2019.100346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2018] [Revised: 03/12/2019] [Accepted: 03/15/2019] [Indexed: 12/14/2022]
Abstract
Introduction Bleeding complications after transcatheter aortic valve implantation (TAVI) is a major problem in clinical practice. However, there is few information on thrombogenicity after TAVI. The aim of this study was to establish a monitoring of total thrombogenicity in perioperative TAVI using the Total Thrombus-formation Analysis System (T-TAS), a microchip-based flow chamber system for analysis of thrombus formation under flow condition. Methods Twenty-three patients with severe aortic stenosis who underwent TAVI between August 2017 and March 2018 at Kumamoto university hospital were enrolled. After exclusion, data of 21 patients were analyzed. Blood samples were obtained before, 2, 7, and 30 days after TAVI. Thrombogenicity were assessed by the T-TAS to compute the area under the curve (AUC) (AR10-AUC30) in the AR chip. We also measured platelet count, high-molecular-weight von Willebrand factor (HMW-vWF) multimers, and plasma thrombopoietin. Computational fluid dynamics (CFD) analysis was performed to calculate the wall shear stress (WSS). Results The AR10-AUC30 levels and platelet counts were significantly lower at 2 days post-TAVI, and then increased gradually. HMW-vWF multimers, and plasma thrombopoietin, were significantly higher at 2 days post-TAVI, compared with before TAVI. CFD analysis showed that WSS of the aortic valve and posterior ascending aortic wall were significantly lower after TAVI than before-TAVI. Multivariate analysis identified max velocity measured by echocardiography, platelet count, and D-dimer as significant determinants of AR10-AUC30, representing total thrombogenicity. Conclusions Although HMW-vWF multimers improved earlier after TAVI, total thrombogenic activity evaluated by T-TAS remained relatively low followed by improvement in thrombogenic activity at 30 days after TAVI.Clinical Trial Registration: https://clinicaltrials.gov. Unique identifiers: NCT03248232.
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Affiliation(s)
- Masanobu Ishii
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Koichi Kaikita
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Tatsuro Mitsuse
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Nobuhiro Nakanishi
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yu Oimatsu
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Takayoshi Yamashita
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Suguru Nagamatsu
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Noriaki Tabata
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Koichiro Fujisue
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Daisuke Sueta
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Seiji Takashio
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yuichiro Arima
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Kenji Sakamoto
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Eiichiro Yamamoto
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Kenichi Tsujita
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
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Hemodynamics and Wall Mechanics after Surgical Repair of Aortic Arch: Implication for Better Clinical Decisions. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9040807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Graft repair of aortic coarctation is commonly used to mimic the physiological aortic arch shape and function. Various graft materials and shapes have been adopted for the surgery. The goal of this work is to quantitatively assess the impact of graft materials and shapes in the hemodynamics and wall mechanics of the restored aortic arch and its correlation with clinical outcomes. A three-dimensional aortic arch model was reconstructed from magnetic resonance images. The fluid–structure interaction (FSI) analysis was performed to characterize the hemodynamics and solid wall mechanics of the repaired aortic arch. Two graft shapes (i.e., a half-moon shape and a crescent one) were considered. Material choices of the aortic arch repair included three commonly used graft materials (i.e., polytetrafluoroethylene (PTFE) synthetic graft, CorMatrix extracellular matrix, and pulmonary homograft) as well as one native tissue serving as a control. The pathological hemodynamic parameters, in terms of the percentage area of low wall shear stress (WSS), high oscillatory shear index (OSI), and high relative residence time (RRT), were quantified to be associated with potential clinical outcomes. Results have shown that the peak von Mises stress for the aortic arch repaired by the crescent graft was 76% less than that of the half-moon graft. Flow disturbance and recirculation were also minimized with the crescent graft. Moreover, pathological hemodynamic parameters were significantly reduced with the crescent graft. The graft material mismatch with the surrounding tissue aggregated the stress concentration on the aortic wall, but had minimal impact on flow dynamics. The present work demonstrated the role and importance of the graft geometry and materials on hemodynamics and wall mechanics, which could guide optimal graft decisions towards better clinical outcomes.
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Takigami M, Itatani K, Nakanishi N, Nakaji K, Kajiyama Y, Matoba S, Yaku H, Yamagishi M. Evaluation using a four-dimensional imaging tool before and after pulmonary valve replacement in a patient with tetralogy of Fallot: a case report. J Med Case Rep 2019; 13:30. [PMID: 30722790 PMCID: PMC6362591 DOI: 10.1186/s13256-018-1964-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 12/20/2018] [Indexed: 05/30/2023] Open
Abstract
BACKGROUND Pulmonary regurgitation is a common complication after tetralogy of Fallot repair, resulting in right ventricular dysfunction, arrhythmia, and sudden death. However, the indications and optimal timing for pulmonary valve replacement are not fully known. We describe a case in which a four-dimensional imaging tool was useful in the decision to re-operate, thus resulting in decreased energy loss and improved right ventricular function after the re-operation for tetralogy of Fallot. CASE PRESENTATION A 54-year-old Japanese woman visited our hospital due to palpitations and wide QRS tachycardia with persistent tiredness for several months. She underwent repair of tetralogy of Fallot when she was 2-years old. An electrocardiogram showed prolonged QRS duration (199 msec) with a complete right bundle branch block and an echocardiograph demonstrated that her right ventricle was highly enlarged and had poor contraction, and severe pulmonary valve regurgitation with one leaflet flail. Four-dimensional flow magnetic resonance imaging demonstrated that regurgitant volumes and regurgitant fractions of pulmonary regurgitation were calculated as 63.12 ml and 54.0%, respectively. Right ventricular end-diastolic/end-systolic volume index was 169.54/99.76 mL/m2, and the cardiac index was 1.78 L/minute per m2. Flow energy loss was 2.93 mW, which is estimated to be three times higher than normal controls. An electrophysiological study showed an intact anterior internodal pathway and a slow pathway just through the outside of the right atriotomy line scar, which is supposed to cause a re-entry circuit. We decided to perform a pulmonary valve replacement and a right maze procedure. A 27 mm bioprosthetic valve was implanted in the native pulmonary annulus with a supra-annular position. Concomitantly, the right maze procedure was performed. A four-dimensional flow magnetic resonance imaging done 3 months later showed that right ventricular end-diastolic/end-systolic volume index had significantly reduced to 85.24/55.41 mL/m2 and the cardiac index had increased from 1.78 to 2.58 L/minute per m2. Energy loss had greatly improved from 2.93 to 1.48 mW. CONCLUSIONS A four-dimensional imaging tool was useful in the decision to re-operate, thus resulting in decreased energy loss and improved right ventricular function after the re-operation for tetralogy of Fallot.
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Affiliation(s)
- Masao Takigami
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan.
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Naohiko Nakanishi
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan
| | - Kosuke Nakaji
- Department of Radiology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yo Kajiyama
- Department of Pediatrics, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoaki Matoba
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ward, Kyoto, 602-8566, Japan
| | - Hitoshi Yaku
- Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masaaki Yamagishi
- Department of Pediatric Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Marlevi D, Ruijsink B, Balmus M, Dillon-Murphy D, Fovargue D, Pushparajah K, Bertoglio C, Colarieti-Tosti M, Larsson M, Lamata P, Figueroa CA, Razavi R, Nordsletten DA. Estimation of Cardiovascular Relative Pressure Using Virtual Work-Energy. Sci Rep 2019; 9:1375. [PMID: 30718699 PMCID: PMC6362021 DOI: 10.1038/s41598-018-37714-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 12/12/2018] [Indexed: 12/21/2022] Open
Abstract
Many cardiovascular diseases lead to local increases in relative pressure, reflecting the higher costs of driving blood flow. The utility of this biomarker for stratifying the severity of disease has thus driven the development of methods to measure these relative pressures. While intravascular catheterisation remains the most direct measure, its invasiveness limits clinical application in many instances. Non-invasive Doppler ultrasound estimates have partially addressed this gap; however only provide relative pressure estimates for a range of constricted cardiovascular conditions. Here we introduce a non-invasive method that enables arbitrary interrogation of relative pressures throughout an imaged vascular structure, leveraging modern phase contrast magnetic resonance imaging, the virtual work-energy equations, and a virtual field to provide robust and accurate estimates. The versatility and accuracy of the method is verified in a set of complex patient-specific cardiovascular models, where relative pressures into previously inaccessible flow regions are assessed. The method is further validated within a cohort of congenital heart disease patients, providing a novel tool for probing relative pressures in-vivo.
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Affiliation(s)
- David Marlevi
- Department of Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Stockholm, Sweden.
- Department of Clinical Sciences, Karolinska Institutet, Stockholm, Sweden.
| | - Bram Ruijsink
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
- Department of Congenital Heart Disease, Evelina Children's Hospital, London, United Kingdom
| | - Maximilian Balmus
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
| | - Desmond Dillon-Murphy
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
| | - Daniel Fovargue
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
| | - Kuberan Pushparajah
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
- Department of Congenital Heart Disease, Evelina Children's Hospital, London, United Kingdom
| | - Cristóbal Bertoglio
- Bernoulli Institute, University of Groningen, Groningen, The Netherlands
- Center for Mathematical Modeling, Universidad de Chile, Santiago, Chile
| | - Massimiliano Colarieti-Tosti
- Department of Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Stockholm, Sweden
- Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Matilda Larsson
- Department of Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Pablo Lamata
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
| | - C Alberto Figueroa
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
- Departments of Surgery and Biomedical Engineering, University of Michigan, Ann Arbor, USA
| | - Reza Razavi
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom
- Department of Congenital Heart Disease, Evelina Children's Hospital, London, United Kingdom
| | - David A Nordsletten
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, London, United Kingdom.
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Kato N, Yamagishi M, Itatani K, Miyazaki T, Maeda Y, Asada S, Matsui Y, Yaku H. Effects of blood flow dynamics on autologous pericardial degeneration in reconstructed pulmonary arteries. Interact Cardiovasc Thorac Surg 2018; 26:293-300. [PMID: 29049701 DOI: 10.1093/icvts/ivx293] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/06/2017] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES To clarify the risk factors for abnormal degeneration of autologous pericardium, the mechanical stress on the endothelial tissue caused by turbulent blood flow in the pulmonary artery (PA) reconstructed with autologous pericardium and major aortopulmonary collateral arteries was assumed in pulmonary atresia and ventricular septal defect. METHODS Patient-specific PA models were created for 6 patients based on their past computed tomography images taken after unifocalization of major aortopulmonary collateral arteries. Computational fluid dynamics models were created to simulate the physiological pulsatile flow including the peripheral reflection wave, characteristic impedance and autonomous regulation system. Flow streamline, wall shear stress (WSS) and the oscillatory shear index (OSI) were calculated from the simulated result. PA degeneration was evaluated with the computed tomography images before the intracardiac repair. RESULTS Regions with physiological high WSS had fewer abnormal changes. Excessively high WSS was often detected at the anastomosis site of the reconstructed PA, and intimal thickening was found in these regions during intracardiac repair. Regions with high OSI and low WSS had dilated change within several months. In 1 patient, in particular, detached vortex flow occurred at the rectangular angle anastomosis site of the right PA in flow streamline, resulting in high OSI and low WSS with abnormal enlargement in the pericardium. CONCLUSIONS Endothelial stress caused by blood flow would affect the degeneration of autologous pericardium and major aortopulmonary collateral arteries in the reconstructed PA. High OSI and low WSS might induce enlargement or dilatation, and excessively high WSS in the anastomosis site might induce intimal thickening.
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Affiliation(s)
- Nobuyasu Kato
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan.,Department of Cardiovascular and Thoracic Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Masaaki Yamagishi
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Keiichi Itatani
- Division of Cardiovascular Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takako Miyazaki
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshinobu Maeda
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoshi Asada
- Department of Pediatric Cardiovascular Surgery, Children's Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshiro Matsui
- Division of Cardiovascular Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hitoshi Yaku
- Department of Cardiovascular and Thoracic Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
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Shibata M, Itatani K, Hayashi T, Honda T, Kitagawa A, Miyaji K, Ono M. Flow Energy Loss as a Predictive Parameter for Right Ventricular Deterioration Caused by Pulmonary Regurgitation After Tetralogy of Fallot Repair. Pediatr Cardiol 2018; 39:731-742. [PMID: 29453683 DOI: 10.1007/s00246-018-1813-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 01/04/2018] [Indexed: 11/24/2022]
Abstract
The optimal timing for pulmonary valve replacement after Tetralogy of Fallot (TOF) repair remains controversial. In this study, we estimated the feasibility of using flow energy loss (FEL) to predict right ventricular (RV) deterioration due to pulmonary regurgitation after TOF repair. We examined RV outflow tract (RVOT) flow in nine patients who underwent TOF or double-outlet right ventricle repair in the intervention group (Group I) and compared them with three healthy children in the control group (Group C). We evaluated flow across the RVOT and pulmonary valve by vector flow mapping (VFM) on echocardiography and by phase contrast-magnetic resonance imaging (PC-MRI). Next, we calculated FEL and analyzed the relationship between FEL and clinical parameters of RV function. The mean FEL was significantly greater in Group I than in Group C (p = 0.002). Flow pattern and FEL were comparable by VFM and PC-MRI at the same phase 14.6 years after TOF repair. There was a significant positive correlation for the cardiothoracic ratio with both the mean FEL [correlation coefficient (r) = 0.78; p = 0.012] and the diastolic peak FEL (r = 0.75; p = 0.021) in Group I. There was also a significant positive correlation between the serial change in QRS duration with both the mean FEL (r = 0.82; p = 0.014) and the diastolic FEL (r = 0.70; p = 0.052) in Group I. FEL by VFM is an effective tool for evaluating ventricular deterioration caused by RV workload.
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Affiliation(s)
- Miyuki Shibata
- Department of Cardiac Surgery, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Keiichi Itatani
- Department of Cardiac Surgery, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. .,Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan.
| | - Taiyu Hayashi
- Department of Cardiology, National Center for Child Health and Development, Tokyo, Japan
| | - Takashi Honda
- Department of Pediatrics, Kitasato University School of Medicine, Sagamihara, Japan
| | - Atsushi Kitagawa
- Department of Pediatrics, Kitasato University School of Medicine, Sagamihara, Japan
| | - Kagami Miyaji
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Japan
| | - Minoru Ono
- Department of Cardiac Surgery, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
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48
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Miyazaki S, Miyaji K, Itatani K, Oka N, Goto S, Nakamura M, Kitamura T, Horai T, Sughimoto K, Nakamura Y, Yoshimura N. Surgical strategy for aortic arch reconstruction after the Norwood procedure based on numerical flow analysis. Interact Cardiovasc Thorac Surg 2018; 26:460-467. [PMID: 29049796 DOI: 10.1093/icvts/ivx332] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 09/01/2017] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVES Inefficient aortic flow after the Norwood procedure is known to lead to the deterioration of ventricular function due to an increased cardiac workload. To prevent the progression of aortic arch obstruction, arch reconstruction concomitant with second-stage surgery is recommended. The aim of this study was to determine the indications for reconstruction based on numerical simulation and to reveal the morphology that affects the haemodynamic parameters. METHODS Fifteen patients who underwent the Norwood procedure or arch repair and Damus-Kaye-Stansel anastomosis were enrolled. The pressure gradient in aortic arch was 1.6 ± 3.9 mmHg (ranged from 0 to 12 mmHg) on catheter examination. Six patients who had prominent turbulent flow accompanied with a large flow energy loss index greater than 40 mW/m2 and high wall shear stress greater than 100 Pa underwent arch reconstruction. RESULTS After arch reconstruction, the energy loss index significantly decreased from 88.5 ± 50.0 mW/m2 to 23.1 ± 10.4 mW/m2 (P = 0.026) and wall shear stress significantly decreased from 194.5 ± 87.4 Pa to 60.3 ± 40.5 Pa (P = 0.0062). There were 3 late deaths due to heart failure caused by progressive atrioventricular valve regurgitation during the follow-up period (60 months). The systemic ventricular function was preserved in the remaining patients without any pressure gradients in the arch. CONCLUSIONS Determining the surgical strategy for arch reconstruction based on numerical flow analysis may effectively reduce the ventricular load even if no stenosis or pressure gradients are observed on catheter examination or echocardiography.
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Affiliation(s)
- Shohei Miyazaki
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Kagami Miyaji
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Cardiovascular Imaging Research Laboratory, Kyoto Prefectural University of Medicine, Kyoto City, Kyoto, Japan
| | - Norihiko Oka
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Shinji Goto
- Department of Mechanical Engineering, Saitama University, Saitama City, Saitama, Japan
| | - Masanori Nakamura
- Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Aichi, Japan
| | - Tadashi Kitamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Tetsuya Horai
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Koichi Sughimoto
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Yuki Nakamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Kanagawa, Japan
| | - Naoki Yoshimura
- Department of Surgery I, Toyama University School of Medicine, Toyama City, Toyama, Japan
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49
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Ni MW, Prather RO, Rodriguez G, Quinn R, Divo E, Fogel M, Kassab AJ, DeCampli WM. Computational Investigation of a Self-Powered Fontan Circulation. Cardiovasc Eng Technol 2018; 9:202-216. [PMID: 29464511 DOI: 10.1007/s13239-018-0342-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 02/12/2018] [Indexed: 11/25/2022]
Abstract
Children born with anatomic or functional "single ventricle" must progress through two or more major operations to sustain life. This management sequence culminates in the total cavopulmonary connection, or "Fontan" operation. A consequence of the "Fontan circulation", however, is elevated central venous pressure and inadequate ventricular preload, which contribute to continued morbidity. We propose a solution to these problems by increasing pulmonary blood flow using an "injection jet" (IJS) in which the source of blood flow and energy is the ventricle itself. The IJS has the unique property of lowering venous pressure while enhancing pulmonary blood flow and ventricular preload. We report preliminary results of an analysis of this circulation using a tightly-coupled, multi-scale computational fluid dynamics model. Our calculations show that, constraining the excess volume load to the ventricle at 50% (pulmonary to systemic flow ratio of 1.5), an optimally configured IJS can lower venous pressure by 3 mmHg while increasing systemic oxygen delivery. Even this small decrease in venous pressure may have substantial clinical impact on the Fontan patient. These findings support the potential for a straightforward surgical modification to decrease venous pressure, and perhaps improve clinical outcome in selected patients.
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Affiliation(s)
- Marcus W Ni
- Department of Mechanical and Aerospace Engineering, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, 32816, USA.
| | - Ray O Prather
- Department of Mechanical and Aerospace Engineering, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, 32816, USA
| | - Giovanna Rodriguez
- Department of Mechanical and Aerospace Engineering, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, 32816, USA
| | - Rachel Quinn
- College of Medicine, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, USA
| | - Eduardo Divo
- Department of Mechanical Engineering, Embry-Riddle Aeronautical University, 600 S Clyde Morris Blvd, Daytona Beach, FL, USA
| | - Mark Fogel
- The Perelman School of Medicine at The University of Pennsylvania, Philadelphia, PA, USA.,Division of Cardiology/Department of Pediatrics and the Department of Radiology, The Children's Hospital of Philadelphia, 3401 Civic Center Blvd, Philadelphia, PA, USA
| | - Alain J Kassab
- Department of Mechanical and Aerospace Engineering, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, 32816, USA
| | - William M DeCampli
- College of Medicine, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL, USA.,Arnold Palmer Hospital for Children, 92 W Miller St, Orlando, FL, USA
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50
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Honda T, Itatani K, Takanashi M, Kitagawa A, Ando H, Kimura S, Oka N, Miyaji K, Ishii M. Exploring energy loss by vector flow mapping in children with ventricular septal defect: Pathophysiologic significance. Int J Cardiol 2017. [DOI: 10.1016/j.ijcard.2017.06.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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