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Mendiola Pla M, Berrettoni S, Lee FH, Rozzi G, Marrano F, Gross RT, Evans A, Wendell DC, Lezberg P, Burattini M, Paolo lo Muzio F, Fassina L, Milano CA, Bang ML, Bowles DE, Miragoli M. Video analysis of ex vivo beating hearts during preservation on the TransMedics® organ care system. Front Cardiovasc Med 2023; 10:1216917. [PMID: 37408655 PMCID: PMC10318359 DOI: 10.3389/fcvm.2023.1216917] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 05/23/2023] [Indexed: 07/07/2023] Open
Abstract
Background Reliable biomarkers for assessing the viability of the donor hearts undergoing ex vivo perfusion remain elusive. A unique feature of normothermic ex vivo perfusion on the TransMedics® Organ Care System (OCS™) is that the donor heart is maintained in a beating state throughout the preservation period. We applied a video algorithm for an in vivo assessment of cardiac kinematics, video kinematic evaluation (Vi.Ki.E.), to the donor hearts undergoing ex vivo perfusion on the OCS™ to assess the feasibility of applying this algorithm in this setting. Methods Healthy donor porcine hearts (n = 6) were procured from Yucatan pigs and underwent 2 h of normothermic ex vivo perfusion on the OCS™ device. During the preservation period, serial high-resolution videos were captured at 30 frames per second. Using Vi.Ki.E., we assessed the force, energy, contractility, and trajectory parameters of each heart. Results There were no significant changes in any of the measured parameters of the heart on the OCS™ device over time as judged by linear regression analysis. Importantly, there were no significant changes in contractility during the duration of the preservation period (time 0-30 min, 918 ± 430 px/s; time 31-60 min, 1,386 ± 603 px/s; time 61-90 min, 1,299 ± 617 px/s; time 91-120 min, 1,535 ± 728 px/s). Similarly, there were no significant changes in the force, energy, or trajectory parameters. Post-transplantation echocardiograms demonstrated robust contractility of each allograft. Conclusion Vi.Ki.E. assessment of the donor hearts undergoing ex vivo perfusion is feasible on the TransMedics OCS™, and we observed that the donor hearts maintain steady kinematic measurements throughout the duration.
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Affiliation(s)
| | - Silvia Berrettoni
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Franklin H. Lee
- Department of Surgery, Duke University Medical Center, Durham, NC, United States
| | - Giacomo Rozzi
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Federica Marrano
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Ryan T. Gross
- Department of Surgery, Duke University Medical Center, Durham, NC, United States
| | - Amy Evans
- Perfusion Services, Duke University Medical Center, Durham, NC, United States
| | - David C. Wendell
- Duke Cardiovascular Magnetic Resonance Center, Duke University Medical Center, Durham, NC, United States
| | | | - Margherita Burattini
- Department of Medicine and Surgery, University of Parma, Parma, Italy
- Department of Surgical Sciences, Dentistry, and Maternity, University of Verona, Verona, Italy
| | | | - Lorenzo Fassina
- Department of Electrical, Computer, and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Carmelo A. Milano
- Department of Surgery, Duke University Medical Center, Durham, NC, United States
| | - Marie-Louise Bang
- Institute of Genetic and Biomedical Research (IRGB), National Research Council (CNR), Milan Unit, Milan, Italy
- IRCCS Humanitas Research Hospital, Milan, Italy
| | - Dawn E. Bowles
- Department of Surgery, Duke University Medical Center, Durham, NC, United States
| | - Michele Miragoli
- Department of Medicine and Surgery, University of Parma, Parma, Italy
- IRCCS Humanitas Research Hospital, Milan, Italy
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2
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Fassina L, Assenza MR, Miragoli M, Isidori AM, Naro F, Barbagallo F. Cell Shortening and Calcium Homeostasis Analysis in Adult Cardiomyocytes via a New Software Tool. Biomedicines 2022; 10:biomedicines10030640. [PMID: 35327442 PMCID: PMC8945339 DOI: 10.3390/biomedicines10030640] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 03/04/2022] [Accepted: 03/08/2022] [Indexed: 11/16/2022] Open
Abstract
Intracellular calcium (Ca2+) is the central regulator of heart contractility. Indeed, it couples the electrical signal, which pervades the myocardium, with cardiomyocytes contraction. Moreover, alterations in calcium management are the main factors contributing to the mechanical and electrical dysfunction observed in failing hearts. So, simultaneous analysis of the contractile function and intracellular Ca2+ is indispensable to evaluate cardiomyocytes activity. Intracellular Ca2+ variations and fraction shortening are commonly studied with fluorescent Ca2+ indicator dyes associated with microscopy techniques. However, tracking and dealing with multiple files manually is time-consuming and error-prone and often requires expensive apparatus and software. Here, we announce a new, user-friendly image processing and analysis tool, based on ImageJ-Fiji/MATLAB® software, to evaluate the major cardiomyocyte functional parameters. We succeeded in analyzing fractional cell shortening, Ca2+ transient amplitude, and the kinematics/dynamics parameters of mouse isolated adult cardiomyocytes. The proposed method can be applied to evaluate changes in the Ca2+ cycle and contractile behavior in genetically or pharmacologically induced disease models, in drug screening and other common applications to assess mammalian cardiomyocyte functions.
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Affiliation(s)
- Lorenzo Fassina
- Department of Electrical, Computer and Biomedical Engineering (DIII), University of Pavia, 27100 Pavia, Italy;
| | - Maria Rita Assenza
- Institute of Biochemistry and Cell Biology, CNR, 00015 Monterotondo, Italy;
- Department of Anatomical, Histological, Forensic and Orthopedic Sciences, Sapienza University, 00161 Rome, Italy;
| | - Michele Miragoli
- Department of Medicine and Surgery, University of Parma, 43126 Parma, Italy;
- Humanitas Research Hospital—IRCCS, 20089 Rozzano, Italy
| | - Andrea M. Isidori
- Department of Experimental Medicine, Sapienza University, 00161 Rome, Italy;
| | - Fabio Naro
- Department of Anatomical, Histological, Forensic and Orthopedic Sciences, Sapienza University, 00161 Rome, Italy;
| | - Federica Barbagallo
- Department of Experimental Medicine, Sapienza University, 00161 Rome, Italy;
- Correspondence:
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3
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Artificial Intelligence Supports Decision Making during Open-Chest Surgery of Rare Congenital Heart Defects. J Clin Med 2021; 10:jcm10225330. [PMID: 34830612 PMCID: PMC8623430 DOI: 10.3390/jcm10225330] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/08/2021] [Accepted: 11/10/2021] [Indexed: 12/21/2022] Open
Abstract
The human right ventricle is barely monitored during open-chest surgery due to the absence of intraoperative imaging techniques capable of elaborating its complex function. Accordingly, artificial intelligence could not be adopted for this specific task. We recently proposed a video-based approach for the real-time evaluation of the epicardial kinematics to support medical decisions. Here, we employed two supervised machine learning algorithms based on our technique to predict the patients’ outcomes before chest closure. Videos of the beating hearts were acquired before and after pulmonary valve replacement in twelve Tetralogy of Fallot patients and recordings were properly labeled as the “unhealthy” and “healthy” classes. We extracted frequency-domain-related features to train different supervised machine learning models and selected their best characteristics via 10-fold cross-validation and optimization processes. Decision surfaces were built to classify two additional patients having good and unfavorable clinical outcomes. The k-nearest neighbors and support vector machine showed the highest prediction accuracy; the patients’ class was identified with a true positive rate ≥95% and the decision surfaces correctly classified the additional patients in the “healthy” (good outcome) or “unhealthy” (unfavorable outcome) classes. We demonstrated that classifiers employed with our video-based technique may aid cardiac surgeons in decision making before chest closure.
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4
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Colli Franzone P, Pavarino LF, Scacchi S. Numerical evaluation of cardiac mechanical markers as estimators of the electrical activation time. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2021; 37:e3285. [PMID: 31808301 DOI: 10.1002/cnm.3285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 10/11/2019] [Accepted: 11/10/2019] [Indexed: 06/10/2023]
Abstract
Recent advances in the development of noninvasive cardiac imaging technologies have made it possible to measure longitudinal and circumferential strains at a high spatial resolution also at intramural level. Local mechanical activation times derived from these strains can be used as noninvasive estimates of electrical activation, in order to determine, eg, the origin of premature ectopic beats during focal arrhythmias or the pathway of reentrant circuits. The aim of this work is to assess the reliability of mechanical activation time markers derived from longitudinal and circumferential strains, denoted by ATell and ATecc , respectively, by means of three-dimensional cardiac electromechanical simulations. These markers are compared against the electrical activation time (ATv ), computed from the action potential waveform, and the reference mechanical activation markers derived from the active tension and fiber strain waveforms, denoted by ATta and ATeff , respectively. Our numerical simulations are based on a strongly coupled electromechanical model, including bidomain representation of the cardiac tissue, mechanoelectric (ie, stretch-activated channels) and geometric feedbacks, transversely isotropic strain energy function for the description of passive mechanics and detailed membrane and excitation-contraction coupling models. The results have shown that, during endocardial and epicardial ectopic stimulations, all the mechanical markers considered are highly correlated with ATv , exhibiting correlation coefficients larger than 0.8. However, during multiple endocardial stimulations, mimicking the ventricular sinus rhythm, the mechanical markers are less correlated with the electrical activation time, because of the more complex resulting excitation sequence. Moreover, the inspection of the endocardial and epicardial isochrones has shown that the ATell and ATecc mechanical activation sequences reproduce only some qualitative features of the electrical activation sequence, such as the areas of early and late activation, but in some cases, they might yield wrong excitation sources and significantly different isochrones patterns.
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Affiliation(s)
| | - Luca F Pavarino
- Dipartimento di Matematica, Università di Milano, Milano, Italy
| | - Simone Scacchi
- Dipartimento di Matematica, Università di Milano, Milano, Italy
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5
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Rozzi G, Lo Muzio FP, Fassina L, Rossi S, Statello R, Sandrini C, Laricchiuta M, Faggian G, Miragoli M, Luciani GB. Right ventricular functional recovery depends on timing of pulmonary valve replacement in tetralogy of Fallot: a video kinematic study. Eur J Cardiothorac Surg 2021; 59:1329-1336. [PMID: 33547473 DOI: 10.1093/ejcts/ezab026] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 11/19/2020] [Accepted: 12/07/2020] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Indications for and timing of pulmonary valve replacement (PVR) after tetralogy of Fallot repair are controversial. Among magnetic resonance imaging indices proposed to time valve replacement, a right ventricular (RV) end-diastolic volume index greater than 160 ml/m2 is often used. Recent evidence suggests that this value may still identify patients with irreversible RV dysfunction, thus hindering recovery. Our goal was to define, using intraoperative video kinematic evaluation, whether a relationship exists between timing of PVR and early functional recovery after surgery. METHODS Between November 2016 and November 2018, a total of 12 consecutive patients aged 27.1 ± 19.1 years underwent PVR on average 22.2 ± 13.3 years after tetralogy of Fallot repair. Mean RV end-diastolic volume evident on the magnetic resonance images was 136.9 ± 35.7 ml/m2. Intraoperative cardiac kinematics were assessed by video kinematic evaluation via a high-speed camera acquiring videos at 200 fps before and after valve replacement. RESULTS Patients presenting with RV end-diastolic volume <147 ml/m2 were significantly younger (11.2 ± 5.0 vs 38.4 ± 17.0; P = 0.005) and had a shorter time interval to valve replacement (11.0 ± 5.2 vs 30.1 ± 11.3; P = 0.03). The entire population showed a moderate correlation among energy expenditure, cardiac fatigue, perimeter of contraction and preoperative RV end-diastolic volume index. Both groups showed a reduction in all kinematic parameters after PVR, but those with end-diastolic volume >147 ml/m2 showed an unpredictable outcome. CONCLUSIONS Video kinematic evaluation provides insight into intraoperative RV recovery in patients with tetralogy of Fallot undergoing PVR. Accordingly, functional recovery can be expected in patients with preoperative end-diastolic volume <147 ml/m2.
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Affiliation(s)
- Giacomo Rozzi
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy.,Department of Medicine and Surgery, University of Parma, Parma, Italy.,Departement of Molecular Cardiology, Humanitas Clinical and Research Center, IRCCS, Rozzano, Italy
| | - Francesco Paolo Lo Muzio
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy.,Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Lorenzo Fassina
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Stefano Rossi
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Rosario Statello
- Department of Medicine and Surgery, University of Parma, Parma, Italy.,Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | | | - Maira Laricchiuta
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy
| | - Giuseppe Faggian
- Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy
| | - Michele Miragoli
- Department of Medicine and Surgery, University of Parma, Parma, Italy.,Departement of Molecular Cardiology, Humanitas Clinical and Research Center, IRCCS, Rozzano, Italy
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Rozzi G, Lo Muzio FP, Sandrini C, Rossi S, Fassina L, Faggian G, Miragoli M, Luciani GB. Real-time video kinematic evaluation of the in situ beating right ventricle after pulmonary valve replacement in patients with tetralogy of Fallot: a pilot study. Interact Cardiovasc Thorac Surg 2019; 29:625-631. [DOI: 10.1093/icvts/ivz120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 04/01/2019] [Accepted: 04/14/2019] [Indexed: 01/30/2023] Open
Abstract
Abstract
OBJECTIVES
The timing for pulmonary valve replacement (PVR) after tetralogy of Fallot repair is controversial, due to limitations in estimating right ventricular dysfunction and recovery. Intraoperative imaging could add prognostic information, but transoesophageal echocardiography is unsuitable for exploring right heart function. Right ventricular function after PVR was investigated in real time using a novel video-based contactless kinematic evaluation technology (Vi.Ki.E.), which calculates cardiac fatigue and energy consumption.
METHODS
Six consecutive patients undergoing PVR at 13.8 ± 2.6 years (range 6.9–19.8) after the repair of tetralogy of Fallot were enrolled. Mean right ventricular end-diastolic and end-systolic volume at magnetic resonance imaging were 115.6 ± 16.2 ml/m2 and 61.5 ± 14.6 ml/m2, respectively. Vi.Ki.E. uses a fast-resolution camera placed 45 cm above the open chest, recording cardiac kinematics before and after PVR. An algorithm defines cardiac parameters, such as energy, fatigue, maximum contraction velocity and tissue displacement.
RESULTS
There were no perioperative complications, with patients discharged in satisfactory clinical conditions after 7 ± 2 days (range 5–9). Vi.Ki.E. parameters describing right ventricular dysfunction decreased significantly after surgery: energy consumption by 45% [271 125 ± 9422 (mm/s)2 vs 149 202 ± 11 980 (mm/s)2, P = 0.0001], cardiac fatigue by 12% (292 671 ± 29 369 mm/s2 vs 258 755 ± 42 750 mm/s2, P = 0.01), contraction velocity by 54% (3412 ± 749 mm/s vs 1579 ± 400 mm/s, P = 0.0007) and displacement by 23% (27 ± 4 mm vs 21 ± 4 mm, P = 0.01). Patients undergoing PVR at lower end-diastolic volumes, had greater functional recovery of Vi.Ki.E. parameters.
CONCLUSIONS
Intraoperative Vi.Ki.E shows immediate recovery of right ventricular mechanics after PVR with less cardiac fatigue and energy consumption, providing novel insights that may have a prognostic relevance for functional recovery.
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Affiliation(s)
- Giacomo Rozzi
- Department of Surgery, Dentistry, Pediatrics and Gynaecology, University of Verona, Verona, Italy
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Francesco P Lo Muzio
- Department of Surgery, Dentistry, Pediatrics and Gynaecology, University of Verona, Verona, Italy
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Camilla Sandrini
- Department of Surgery, Dentistry, Pediatrics and Gynaecology, University of Verona, Verona, Italy
| | - Stefano Rossi
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Lorenzo Fassina
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Giuseppe Faggian
- Department of Surgery, Dentistry, Pediatrics and Gynaecology, University of Verona, Verona, Italy
| | - Michele Miragoli
- Department of Medicine and Surgery, University of Parma, Parma, Italy
- Humanitas Clinical and Research Center, Rozzano, Italy
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7
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Lo Muzio FP, Rozzi G, Rossi S, Gerbolés AG, Fassina L, Pelà G, Luciani GB, Miragoli M. In-situ optical assessment of rat epicardial kinematic parameters reveals frequency-dependent mechanic heterogeneity related to gender. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2019; 154:94-101. [PMID: 31126627 DOI: 10.1016/j.pbiomolbio.2019.05.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/06/2019] [Accepted: 05/08/2019] [Indexed: 12/29/2022]
Abstract
BACKGROUND Gender-related cardiac mechanics following the electrical activity has been investigated from basic to clinical research, but results are still controversial. The aim of this work is to study the gender related cardiac mechanics and to focus on its heart rate dependency. METHODS We employed 12 Sprague Dawley rats (5 males and 7 females) of the same age and, through a novel high resolution artificial vision contactless approach, we evaluated in-situ cardiac kinematic. The hearts were paced on the right atria appendage via cathodal stimuli at rising frequency. RESULTS Kinematic data obtained at rising pacing rates are different between male and female rat hearts: male tended to maintain the same level of cardiac force, energy and contractility, while female responded with an increment of such parameters at increasing heart rate. Female hearts preserved their pattern of contraction and epicardial torsion (vorticity) at rising pacing rates compared to male. Furthermore, we observed a difference in the mechanical restitution: systolic time vs. diastolic time, as an index of cardiac performance, reached higher value in male compared to female hearts. CONCLUSION Our innovative technology was capable to evaluate in-situ rat epicardial kinematic at high stimulation frequency, revealing that male preserved kinematic parameters but varying the pattern of contraction/relaxation. On the contrary, female preserved the pattern of contraction/relaxation increasing kinematic parameters.
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Affiliation(s)
- Francesco Paolo Lo Muzio
- Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona Via S. Francesco 22, 37129, Verona, Italy; Department of Medicine and Surgery, University di Parma, via Gramsci 14, 43126, Parma, Italy
| | - Giacomo Rozzi
- Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona Via S. Francesco 22, 37129, Verona, Italy; Department of Medicine and Surgery, University di Parma, via Gramsci 14, 43126, Parma, Italy
| | - Stefano Rossi
- Department of Medicine and Surgery, University di Parma, via Gramsci 14, 43126, Parma, Italy
| | | | - Lorenzo Fassina
- Department of Industrial Engineering and Informatics, University of Pavia, Via Ferrata 1, 27100, Pavia, Italy
| | - Giovanna Pelà
- Department of Medicine and Surgery, University di Parma, via Gramsci 14, 43126, Parma, Italy
| | - Giovanni Battista Luciani
- Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona Via S. Francesco 22, 37129, Verona, Italy
| | - Michele Miragoli
- Department of Medicine and Surgery, University di Parma, via Gramsci 14, 43126, Parma, Italy; Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Italy.
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8
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Electromechanical effects of concentric hypertrophy on the left ventricle: A simulation study. Comput Biol Med 2018; 99:236-256. [DOI: 10.1016/j.compbiomed.2018.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 11/19/2022]
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9
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Shin B, Cowan DB, Emani SM, Del Nido PJ, McCully JD. Mitochondrial Transplantation in Myocardial Ischemia and Reperfusion Injury. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 982:595-619. [PMID: 28551809 DOI: 10.1007/978-3-319-55330-6_31] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Ischemic heart disease remains the leading cause of death worldwide. Mitochondria are the power plant of the cardiomyocyte, generating more than 95% of the cardiac ATP. Complex cellular responses to myocardial ischemia converge on mitochondrial malfunction which persists and increases after reperfusion, determining the extent of cellular viability and post-ischemic functional recovery. In a quest to ameliorate various points in pathways from mitochondrial damage to myocardial necrosis, exhaustive pharmacologic and genetic tools have targeted various mediators of ischemia and reperfusion injury and procedural techniques without applicable success. The new concept of replacing damaged mitochondria with healthy mitochondria at the onset of reperfusion by auto-transplantation is emerging not only as potential therapy of myocardial rescue, but as gateway to a deeper understanding of mitochondrial metabolism and function. In this chapter, we explore the mechanisms of mitochondrial dysfunction during ischemia and reperfusion, current developments in the methodology of mitochondrial transplantation, mechanisms of cardioprotection and their clinical implications.
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Affiliation(s)
- Borami Shin
- Department of Cardiac Surgery, Boston Children's Hospital, Boston, MA, USA
| | - Douglas B Cowan
- Department of Anesthesiology, Division of Cardiac Anesthesia Research, Harvard Medical School, Boston Children's Hospital, Boston, MA, USA
| | - Sitaram M Emani
- Division of Cardiovascular Critical Care, Harvard Medical School, Boston Children's Hospital, Boston, MA, USA
| | - Pedro J Del Nido
- Department of Cardiac Surgery, William E. Ladd Professor of Child Surgery, Harvard Medical School, Boston Children's Hospital, Boston, MA, USA
| | - James D McCully
- Department of Cardiac Surgery, Harvard Medical School, Boston Children's Hospital, Boston, USA.
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10
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Altered Mitochondrial Metabolism and Mechanosensation in the Failing Heart: Focus on Intracellular Calcium Signaling. Int J Mol Sci 2017; 18:ijms18071487. [PMID: 28698526 PMCID: PMC5535977 DOI: 10.3390/ijms18071487] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 06/28/2017] [Accepted: 07/04/2017] [Indexed: 12/26/2022] Open
Abstract
The heart consists of millions of cells, namely cardiomyocytes, which are highly organized in terms of structure and function, at both macroscale and microscale levels. Such meticulous organization is imperative for assuring the physiological pump-function of the heart. One of the key players for the electrical and mechanical synchronization and contraction is the calcium ion via the well-known calcium-induced calcium release process. In cardiovascular diseases, the structural organization is lost, resulting in morphological, electrical, and metabolic remodeling owing the imbalance of the calcium handling and promoting heart failure and arrhythmias. Recently, attention has been focused on the role of mitochondria, which seem to jeopardize these events by misbalancing the calcium processes. In this review, we highlight our recent findings, especially the role of mitochondria (dys)function in failing cardiomyocytes with respect to the calcium machinery.
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11
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Miragoli M, Cabassi A. Mitochondrial Mechanosensor Microdomains in Cardiovascular Disorders. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 982:247-264. [PMID: 28551791 DOI: 10.1007/978-3-319-55330-6_13] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The cardiomyocytes populating the 'working myocardium' are highly organized and such organization ranges from macroscale (e.g. the geometrical rod shape) to microscale (dyad/t-tubules) domains. This meticulous level of organization is imperative for assuring the normal and physiological pump-function of the heart. In the pathological cardiac tissue, the domains-related architecture is partially lost, resulting in morphological, electrical and metabolic remodeling and promoting cardiovascular diseases including heart failure and arrhythmias. Indeed, arrhythmogenesis during heart failure is a major clinical problem. Arrhythmias have been extensively studied from an electrical etiology, but only recently, physiologists and scientists have focused their attention on cellular and subcellular mechanosensors. We and others have investigated whether the nanoscale mechanosensitive properties of cardiomyocytes from failing hearts have a bearing upon the initiation of abnormal electrical activity. This chapter highlights the recent findings in the field, especially the role of mitochondria function and alignment in failing cardiomyocytes interrogated via nanomechanical stimuli.
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Affiliation(s)
- Michele Miragoli
- Department of Medicine and Surgery, University of Parma, Parma, 43124, Italy. .,Humanitas Clinical and Research Center, Rozzano, MI, Italy.
| | - Aderville Cabassi
- Department of Medicine and Surgery, University of Parma, Parma, 43124, Italy
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