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Coleman JA, Doste R, Ashkir Z, Coppini R, Sachetto R, Watkins H, Raman B, Bueno-Orovio A. Mechanisms of ischaemia-induced arrhythmias in hypertrophic cardiomyopathy: a large-scale computational study. Cardiovasc Res 2024; 120:914-926. [PMID: 38646743 PMCID: PMC11218689 DOI: 10.1093/cvr/cvae086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 01/31/2024] [Accepted: 03/17/2024] [Indexed: 04/23/2024] Open
Abstract
AIMS Lethal arrhythmias in hypertrophic cardiomyopathy (HCM) are widely attributed to myocardial ischaemia and fibrosis. How these factors modulate arrhythmic risk remains largely unknown, especially as invasive mapping protocols are not routinely used in these patients. By leveraging multiscale digital twin technologies, we aim to investigate ischaemic mechanisms of increased arrhythmic risk in HCM. METHODS AND RESULTS Computational models of human HCM cardiomyocytes, tissue, and ventricles were used to simulate outcomes of Phase 1A acute myocardial ischaemia. Cellular response predictions were validated with patch-clamp studies of human HCM cardiomyocytes (n = 12 cells, N = 5 patients). Ventricular simulations were informed by typical distributions of subendocardial/transmural ischaemia as analysed in perfusion scans (N = 28 patients). S1-S2 pacing protocols were used to quantify arrhythmic risk for scenarios in which regions of septal obstructive hypertrophy were affected by (i) ischaemia, (ii) ischaemia and impaired repolarization, and (iii) ischaemia, impaired repolarization, and diffuse fibrosis. HCM cardiomyocytes exhibited enhanced action potential and abnormal effective refractory period shortening to ischaemic insults. Analysis of ∼75 000 re-entry induction cases revealed that the abnormal HCM cellular response enabled establishment of arrhythmia at milder ischaemia than otherwise possible in healthy myocardium, due to larger refractoriness gradients that promoted conduction block. Arrhythmias were more easily sustained in transmural than subendocardial ischaemia. Mechanisms of ischaemia-fibrosis interaction were strongly electrophysiology dependent. Fibrosis enabled asymmetric re-entry patterns and break-up into sustained ventricular tachycardia. CONCLUSION HCM ventricles exhibited an increased risk to non-sustained and sustained re-entry, largely dominated by an impaired cellular response and deleterious interactions with the diffuse fibrotic substrate.
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Affiliation(s)
- James A Coleman
- Department of Computer Science, University of Oxford, Oxford, UK
| | - Ruben Doste
- Department of Computer Science, University of Oxford, Oxford, UK
| | - Zakariye Ashkir
- Oxford Centre for Clinical Magnetic Resonance Research (OCMR), Radcliffe Department of Medicine, Division of Cardiovascular Medicine, University of Oxford, Oxford, UK
| | - Raffaele Coppini
- Department of NeuroFarBa, University of Florence, Florence, Italy
| | - Rafael Sachetto
- Department of Computer Science, Federal University of São João del-Rei, São João del-Rei, Minas Gerais, Brazil
| | - Hugh Watkins
- Radcliffe Department of Medicine, Division of Cardiovascular Medicine, University of Oxford, Oxford, UK
| | - Betty Raman
- Oxford Centre for Clinical Magnetic Resonance Research (OCMR), Radcliffe Department of Medicine, Division of Cardiovascular Medicine, University of Oxford, Oxford, UK
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Ong LT, Fan SWD. Prevalence and clinical significance of late gadolinium enhancement in children and adolescents with hypertrophic cardiomyopathy: a systematic review and meta-analysis. Cardiol Young 2024:1-10. [PMID: 38433549 DOI: 10.1017/s1047951124000337] [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] [Indexed: 03/05/2024]
Abstract
OBJECTIVES Hypertrophic cardiomyopathy is the leading cause of sudden cardiac death among the paediatric population. The aim of this study is to investigate the prevalence and clinical significance of late gadolinium enhancement, as assessed by cardiac MRI, in paediatric hypertrophic cardiomyopathy. METHODS A systematic literature search was conducted in PubMed, SCOPUS, and Ovid SP to identify relevant studies. Pooled estimates with a 95% confidence interval were calculated using the random-effects generic inverse variance model. Statistical analysis was performed using Review Manager v5.4 and R programming. RESULTS Seventeen studies were included in this meta-analysis, encompassing a total of 778 patients. Late gadolinium enhancement was highly prevalent in paediatric hypertrophic cardiomyopathy, with a pooled prevalence of 51% (95% confidence interval, 40-62%). The estimated extent of focal fibrosis expressed as a percentage of left ventricular mass was 4.70% (95% confidence interval, 2.11-7.30%). The presence of late gadolinium enhancement was associated with an increased risk of adverse cardiac events (pooled odds ratio 3.49, 95% confidence interval 1.10-11.09). The left ventricular mass index of late gadolinium enhancement-positive group was higher than the negative group, with a standardised mean difference of 0.91 (95% confidence interval, 0.42-1.41). CONCLUSION This meta-analysis demonstrates that prevalence of late gadolinium enhancement in paediatric hypertrophic cardiomyopathy is similar to that in the adult population. The presence and extent of late gadolinium enhancement are independent predictors of adverse cardiac events, underscoring their prognostic significance among the paediatric population.
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Affiliation(s)
- Leong Tung Ong
- Faculty of Medicine, University of Malaya, Kuala Lumpur, WP, Malaysia
| | - Si Wei David Fan
- Faculty of Medicine, University of Malaya, Kuala Lumpur, WP, Malaysia
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3
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Ganigara M, Sharma B, Doctor P, Nagiub M, Dzelebdzic S, Sebastian R, Fares M, Dillenbeck J, Greil G, Hussain T. Tolerability and efficacy of a reduced dose adenosine stress cardiac magnetic resonance protocol under general anesthesia in infants and children. Pediatr Radiol 2023; 53:2188-2196. [PMID: 37563320 DOI: 10.1007/s00247-023-05738-y] [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: 05/05/2023] [Revised: 07/28/2023] [Accepted: 08/01/2023] [Indexed: 08/12/2023]
Abstract
BACKGROUND Intravenous adenosine induces pharmacological stress by causing vasodilatation and thus carries the risk of severe hypotension when combined with vasodilatory effects of anesthetic agents. OBJECTIVE This study describes our experience with a reduced dose adenosine cardiac magnetic resonance imaging (MRI) protocol in young children under general anesthesia (GA). MATERIALS AND METHODS This is a retrospective report of all patients from birth to 18 years who underwent adenosine stress cardiac MRI under GA between August 2018 and November 2022. Based on our anecdotal experience of severe adverse effects in patients receiving adenosine infusion under GA and in discussion with the pediatric anesthesia team, we developed a modified protocol starting at a dose of 110 mcg/kg/min with incremental escalation to a full dose of 140 mcg/kg/min to achieve desired hemodynamic effect. RESULTS Twenty-two children (mean age 6.5 years, mean weight 28 kg) satisfied the inclusion criteria. The diagnoses included Kawasaki disease (7), anomalous aortic origin of left coronary artery (3), anomalous aortic origin of right coronary artery (2), coronary fistula (3), repaired d-transposition of great arteries (2), repaired anomalous left coronary artery from pulmonary artery (2), repaired truncus arteriosus with left coronary artery occlusion (1), extracardiac-Fontan with left coronary artery myocardial bridge (1), and post heart transplantation (1). Nine patients needed dose escalation beyond 110 mcg/kg/min. Two patients had transient hypotension during testing (systemic blood pressure drop > 25 mmHg). No patient developed significant heart block or bronchospasm. Six patients (repeat study in one) demonstrated inducible perfusion defects (27%) on stress perfusion sequences-5 of whom had confirmed significant coronary abnormalities on angiography or direct surgical inspection. CONCLUSION A reduced/incremental dose adenosine stress cardiac MRI protocol under GA in children is safe and feasible. This avoids severe hypotension which is both unsafe and may result in inaccurate data.
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Affiliation(s)
- Madhusudan Ganigara
- Division of Pediatric Cardiology, Department of Pediatrics, The University of Chicago & Biological Sciences, 5841 S. Maryland Avenue, Chicago, IL, 60637, USA.
| | - Bharti Sharma
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Pezad Doctor
- Division of Pediatric Cardiology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Mohamed Nagiub
- Division of Pediatric Cardiology, University of Virginia Technology, Roanoke, VA, USA
| | - Sanja Dzelebdzic
- Division of Pediatric Cardiology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Roby Sebastian
- Division of Pediatric Anesthesia, Department of Anesthesia, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Munes Fares
- Division of Pediatric Cardiology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Jeanne Dillenbeck
- Division of Pediatric Radiology, Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Gerald Greil
- Division of Pediatric Cardiology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Tarique Hussain
- Division of Pediatric Cardiology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA
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4
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Coleman JA, Ashkir Z, Raman B, Bueno-Orovio A. Mechanisms and prognostic impact of myocardial ischaemia in hypertrophic cardiomyopathy. Int J Cardiovasc Imaging 2023; 39:1979-1996. [PMID: 37358707 PMCID: PMC10589194 DOI: 10.1007/s10554-023-02894-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 06/03/2023] [Indexed: 06/27/2023]
Abstract
Despite the progress made in risk stratification, sudden cardiac death and heart failure remain dreaded complications for hypertrophic cardiomyopathy (HCM) patients. Myocardial ischaemia is widely acknowledged as a contributor to cardiovascular events, but the assessment of ischaemia is not yet included in HCM clinical guidelines. This review aims to evaluate the HCM-specific pro-ischaemic mechanisms and the potential prognostic value of imaging for myocardial ischaemia in HCM. A literature review was performed using PubMed to identify studies with non-invasive imaging of ischaemia (cardiovascular magnetic resonance, echocardiography, and nuclear imaging) in HCM, prioritising studies published after the last major review in 2009. Other studies, including invasive ischaemia assessment and post-mortem histology, were also considered for mechanistic or prognostic relevance. Pro-ischaemic mechanisms in HCM reviewed included the effects of sarcomeric mutations, microvascular remodelling, hypertrophy, extravascular compressive forces and left ventricular outflow tract obstruction. The relationship between ischaemia and fibrosis was re-appraised by considering segment-wise analyses in multimodal imaging studies. The prognostic significance of myocardial ischaemia in HCM was evaluated using longitudinal studies with composite endpoints, and reports of ischaemia-arrhythmia associations were further considered. The high prevalence of ischaemia in HCM is explained by several micro- and macrostructural pathological features, alongside mutation-associated energetic impairment. Ischaemia on imaging identifies a subgroup of HCM patients at higher risk of adverse cardiovascular outcomes. Ischaemic HCM phenotypes are a high-risk subgroup associated with more advanced left ventricular remodelling, but further studies are required to evaluate the independent prognostic value of non-invasive imaging for ischaemia.
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Affiliation(s)
- James A Coleman
- Department of Computer Science, University of Oxford, Oxford, UK
| | - Zakariye Ashkir
- Oxford Centre for Clinical Magnetic Resonance Research, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - Betty Raman
- Oxford Centre for Clinical Magnetic Resonance Research, John Radcliffe Hospital, University of Oxford, Oxford, UK
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5
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Perrone MA, Cimini A, Ricci M, Pizzoferro M, Garganese MC, Raponi M, Schillaci O. Myocardial Functional Imaging in Pediatric Nuclear Cardiology. J Cardiovasc Dev Dis 2023; 10:361. [PMID: 37754790 PMCID: PMC10531976 DOI: 10.3390/jcdd10090361] [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: 04/19/2023] [Revised: 08/03/2023] [Accepted: 08/22/2023] [Indexed: 09/28/2023] Open
Abstract
The role of nuclear medicine in pediatric cardiology has grown rapidly over the years, providing useful functional and prognostic information and playing a complementary role to morphological imaging in the evaluation of myocardial perfusion, cardiovascular inflammation and infections, and cardiac sympathetic innervation. The aim of this narrative review is to summarize and highlight the most important evidence on pediatric nuclear cardiology, describing clinical applications and the possibilities, advantages, and limitations of nuclear medicine techniques. Moreover, a special focus will be given to the minimization of radiation exposure in pediatric nuclear cardiology imaging, a critical topic in children.
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Affiliation(s)
- Marco Alfonso Perrone
- Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children’s Hospital IRCCS, 00165 Rome, Italy
- Division of Cardiology and CardioLab, Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Andrea Cimini
- Nuclear Medicine Unit, St. Salvatore Hospital, 67100 L’Aquila, Italy
| | - Maria Ricci
- Nuclear Medicine Unit, Cardarelli Hospital, 86100 Campobasso, Italy
| | - Milena Pizzoferro
- Division of Nuclear Medicine, Bambino Gesù Children’s Hospital IRCCS, 00165 Rome, Italy
| | | | - Massimiliano Raponi
- Health Directorate, Bambino Gesù Children’s Hospital IRCCS, 00165 Rome, Italy
| | - Orazio Schillaci
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, 00133 Rome, Italy
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6
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Abulaiti A, Zhang Q, Huang H, Ding S, Shayiti M, Wang S, Wang Y, Jia W. The Value of the Cardiac Magnetic Resonance Intravoxel Incoherent Motion Technique in Evaluating Microcirculatory Dysfunction in Hypertrophic Cardiomyopathy. J Interv Cardiol 2023; 2023:4611602. [PMID: 37415784 PMCID: PMC10322278 DOI: 10.1155/2023/4611602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 07/01/2022] [Accepted: 05/27/2023] [Indexed: 07/08/2023] Open
Abstract
Objective To evaluate the value of the cardiac magnetic resonance intravoxel incoherent motion (IVIM) technique in microcirculatory dysfunction in patients with hypertrophic cardiomyopathy (HCM). Methods The medical records of 19 patients with HCM in our hospital from January 2020 to May 2021 were collected retrospectively, and 23 healthy people with a similar age and gender distribution to the patients with HCM were included as controls. All the included subjects underwent clinical assessment and cardiac magnetic resonance imaging. The original IVIM images were analysed, and the imaging parameters of each segment were measured. The HCM group was divided into non-hypertrophic myocardium and hypertrophic myocardium groups. The differences in imaging parameters between the normal and HCM groups were compared. A Spearman correlation analysis was used to explore the correlation between end-diastolic thickness (EDTH) and each IVIM parameter. Results The D∗ and f values in the HCM group were lower than those in the normal group (p < 0.0001 and p = 0.004, respectively). The f, D, D∗, and EDTH values of the hypertrophic segment, non-hypertrophic segment, and normal groups were statistically significant (p < 0.05). The difference in D∗ values among the mild, moderate, severe, and very severe HCM groups was statistically significant (p < 0.05). There was a statistically significant difference in EDTH among the mild, moderate, severe, and very severe groups (p < 0.001). There were significant differences in the values of D, D∗, and f between the non-delayed enhancement group and the delayed enhancement group (p < 0.05). The EDTH values of 304 segments in the HCM group were negatively correlated with f (r = -0.219, p = 0.028) and D∗ values (r = -0.310, p < 0.001). Conclusion The use of IVIM technology can achieve a non-invasive early quantitative assessment of microvascular disease in HCM without the injection of a contrast agent and provide a reference for the early diagnosis of and intervention in myocardial ischemia in patients with HCM.
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Affiliation(s)
- Alina Abulaiti
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Quan Zhang
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Haiyan Huang
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Shuang Ding
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Miriguli Shayiti
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Shaoyu Wang
- MR Scientific Marketing, Siemens Healthineers, Shanghai 201318, China
| | - Yunling Wang
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Wenxiao Jia
- Department of Imaging, First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
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7
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Fogel MA, Anwar S, Broberg C, Browne L, Chung T, Johnson T, Muthurangu V, Taylor M, Valsangiacomo-Buechel E, Wilhelm C. Society for Cardiovascular Magnetic Resonance/European Society of Cardiovascular Imaging/American Society of Echocardiography/Society for Pediatric Radiology/North American Society for Cardiovascular Imaging Guidelines for the use of cardiovascular magnetic resonance in pediatric congenital and acquired heart disease : Endorsed by The American Heart Association. J Cardiovasc Magn Reson 2022; 24:37. [PMID: 35725473 PMCID: PMC9210755 DOI: 10.1186/s12968-022-00843-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 01/12/2022] [Indexed: 11/16/2022] Open
Abstract
Cardiovascular magnetic resonance (CMR) has been utilized in the management and care of pediatric patients for nearly 40 years. It has evolved to become an invaluable tool in the assessment of the littlest of hearts for diagnosis, pre-interventional management and follow-up care. Although mentioned in a number of consensus and guidelines documents, an up-to-date, large, stand-alone guidance work for the use of CMR in pediatric congenital 36 and acquired 35 heart disease endorsed by numerous Societies involved in the care of these children is lacking. This guidelines document outlines the use of CMR in this patient population for a significant number of heart lesions in this age group and although admittedly, is not an exhaustive treatment, it does deal with an expansive list of many common clinical issues encountered in daily practice.
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Affiliation(s)
- Mark A Fogel
- Departments of Pediatrics (Cardiology) and Radiology, The Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA. .,Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Shaftkat Anwar
- Department of Pediatrics (Cardiology) and Radiology, The University of California-San Francisco School of Medicine, San Francisco, USA
| | - Craig Broberg
- Division of Cardiovascular Medicine, Oregon Health and Sciences University, Portland, USA
| | - Lorna Browne
- Department of Radiology, University of Colorado, Denver, USA
| | - Taylor Chung
- Department of Radiology and Biomedical Imaging, The University of California-San Francisco School of Medicine, San Francisco, USA
| | - Tiffanie Johnson
- Department of Pediatrics (Cardiology), Indiana University School of Medicine, Indianapolis, USA
| | - Vivek Muthurangu
- Department of Pediatrics (Cardiology), University College London, London, UK
| | - Michael Taylor
- Department of Pediatrics (Cardiology), University of Cincinnati School of Medicine, Cincinnati, USA
| | | | - Carolyn Wilhelm
- Department of Pediatrics (Cardiology), University Hospitals-Cleveland, Cleaveland, USA
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8
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Fogel MA, Anwar S, Broberg C, Browne L, Chung T, Johnson T, Muthurangu V, Taylor M, Valsangiacomo-Buechel E, Wilhelm C. Society for Cardiovascular Magnetic Resonance/European Society of Cardiovascular Imaging/American Society of Echocardiography/Society for Pediatric Radiology/North American Society for Cardiovascular Imaging Guidelines for the Use of Cardiac Magnetic Resonance in Pediatric Congenital and Acquired Heart Disease: Endorsed by The American Heart Association. Circ Cardiovasc Imaging 2022; 15:e014415. [PMID: 35727874 PMCID: PMC9213089 DOI: 10.1161/circimaging.122.014415] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Cardiovascular magnetic resonance has been utilized in the management and care of pediatric patients for nearly 40 years. It has evolved to become an invaluable tool in the assessment of the littlest of hearts for diagnosis, pre-interventional management and follow-up care. Although mentioned in a number of consensus and guidelines documents, an up-to-date, large, stand-alone guidance work for the use of cardiovascular magnetic resonance in pediatric congenital 36 and acquired 35 heart disease endorsed by numerous Societies involved in the care of these children is lacking. This guidelines document outlines the use of cardiovascular magnetic resonance in this patient population for a significant number of heart lesions in this age group and although admittedly, is not an exhaustive treatment, it does deal with an expansive list of many common clinical issues encountered in daily practice.
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Affiliation(s)
- Mark A Fogel
- Departments of Pediatrics (Cardiology) and Radiology, The Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA, (M.A.F.).,Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA, (M.A.F.)
| | - Shaftkat Anwar
- Department of Pediatrics (Cardiology) and Radiology, The University of California-San Francisco School of Medicine, San Francisco, USA, (S.A.)
| | - Craig Broberg
- Division of Cardiovascular Medicine, Oregon Health and Sciences University, Portland, USA, (C.B.)
| | - Lorna Browne
- Department of Radiology, University of Colorado, Denver, USA, (L.B.)
| | - Taylor Chung
- Department of Radiology and Biomedical Imaging, The University of California-San Francisco School of Medicine, San Francisco, USA, (T.C.)
| | - Tiffanie Johnson
- Department of Pediatrics (Cardiology), Indiana University School of Medicine, Indianapolis, USA, (T.J.)
| | - Vivek Muthurangu
- Department of Pediatrics (Cardiology), University College London, London, UK, (V.M.)
| | - Michael Taylor
- Department of Pediatrics (Cardiology), University of Cincinnati School of Medicine, Cincinnati, USA, (M.T.)
| | | | - Carolyn Wilhelm
- Department of Pediatrics (Cardiology), University Hospitals-Cleveland, Cleaveland, USA (C.W.)
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9
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Nguyen MB, Mital S, Mertens L, Jeewa A, Friedberg MK, Aguet J, Adler A, Lam CZ, Dragulescu A, Rakowski H, Villemain O. Pediatric Hypertrophic Cardiomyopathy: Exploring the Genotype-Phenotype Association. J Am Heart Assoc 2022; 11:e024220. [PMID: 35179047 PMCID: PMC9075072 DOI: 10.1161/jaha.121.024220] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Pediatric hypertrophic cardiomyopathy (HCM) is the most common form of cardiomyopathy in children and a leading cause of sudden cardiac death. Yet, the association between genotype variation, phenotype expression, and adverse events in pediatric HCM has not been fully elucidated. Although the literature on this topic is evolving in adult HCM, the evidence in children is lacking. Solidifying our understanding of this relationship could improve risk stratification as well as improve our comprehension of the underlying pathophysiological characteristics of pediatric HCM. In this state‐of‐the‐art review, we examine the current literature on genetic variations in HCM and their association with outcomes in children, discuss the current approaches to identifying cardiovascular phenotypes in pediatric HCM, and explore possible avenues that could improve sudden cardiac death risk assessment.
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Affiliation(s)
- Minh B Nguyen
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Seema Mital
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Luc Mertens
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Aamir Jeewa
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Mark K Friedberg
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Julien Aguet
- Department of Diagnostic Imaging Hospital for Sick Children University of Toronto Ontario Canada
| | - Arnon Adler
- Division of Cardiology Peter Munk Cardiac Centre Toronto General HospitalUniversity of Toronto Ontario Canada
| | - Christopher Z Lam
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Andreea Dragulescu
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
| | - Harry Rakowski
- Division of Cardiology Peter Munk Cardiac Centre Toronto General HospitalUniversity of Toronto Ontario Canada
| | - Olivier Villemain
- Division of Cardiology Labatt Family Heart Centre Hospital for Sick Children University of Toronto Ontario Canada
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10
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Hutchens JA, Johnson TR, Payne RM. Myocardial Perfusion Reserve in Children with Friedreich Ataxia. Pediatr Cardiol 2021; 42:1834-1840. [PMID: 34245318 DOI: 10.1007/s00246-021-02675-1] [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: 02/07/2021] [Accepted: 06/30/2021] [Indexed: 11/27/2022]
Abstract
Children with Friedreich's ataxia (FA) are at risk of perioperative morbidity and mortality from severe unpredictable heart failure. There is currently no clear way of identifying patients at highest risk. We used myocardial perfusion reserve (MPR), an MRI technique used to assess the maximal myocardial blood flow above baseline, to help determine potential surgical risk in FA subjects. In total, seven children with genetically confirmed FA, ages 8-17 years, underwent MPR stress testing using regadenoson. Six of the seven demonstrated impaired endocardial perfusion during coronary hyperemia. The same six were also found to have evidence of ongoing myocardial damage as illustrated by cardiac troponin I leak (range 0.04-0.17 ng/mL, normal < 0.03 ng/mL). None of the patients had a reduced ejection fraction (range 59-74%) or elevated insulin level (range 2.46-14.23 mCU/mL). This retrospective study shows that children with FA develop MPR defects early in the disease process. It also suggests MPR may be a sensitive tool to evaluate underlying cardiac compromise and could be of use in directing surgical management decisions in children with FA.
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Affiliation(s)
| | - Tiffanie R Johnson
- Indiana University School of Medicine, Indianapolis, IN, USA.,Division of Pediatric Cardiology, Riley Hospital for Children, Indiana University School of Medicine, 1044 West Walnut St, Room R4-302b, Indianapolis, IN, 46202, USA
| | - R Mark Payne
- Indiana University School of Medicine, Indianapolis, IN, USA. .,Division of Pediatric Cardiology, Riley Hospital for Children, Indiana University School of Medicine, 1044 West Walnut St, Room R4-302b, Indianapolis, IN, 46202, USA. .,Herman B Wells Center for Pediatric Research, Indianapolis, IN, USA.
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11
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Rajiah P, Kirsch J, Bolen MA, Batlle JC, Brown RKJ, Francois CJ, Galizia MS, Hanneman K, Inacio JR, Johri AM, Lee DC, Singh SP, Villines TC, Wann S, Zimmerman SL, Abbara S. ACR Appropriateness Criteria® Nonischemic Myocardial Disease with Clinical Manifestations (Ischemic Cardiomyopathy Already Excluded). J Am Coll Radiol 2021; 18:S83-S105. [PMID: 33651982 DOI: 10.1016/j.jacr.2021.01.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 01/27/2021] [Indexed: 12/13/2022]
Abstract
Nonischemic cardiomyopathies encompass a broad spectrum of myocardial disorders with mechanical or electrical dysfunction without evidence of ischemia. There are five broad variants of nonischemic cardiomyopathies; hypertrophic cardiomyopathy (Variant 1), restrictive or infiltrative cardiomyopathy (Variant 2), dilated or unclassified cardiomyopathy (Variant 3), arrhythmogenic cardiomyopathy (Variant 4), and inflammatory cardiomyopathy (Variant 5). For variants 1, 3, and 4, resting transthoracic echocardiography, MRI heart function and morphology without and with contrast, and MRI heart function and morphology without contrast are the usually appropriate imaging modalities. For variants 2 and 5, resting transthoracic echocardiography and MRI heart function and morphology without and with contrast are the usually appropriate imaging modalities. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment.
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Affiliation(s)
| | - Jacobo Kirsch
- Panel Chair, Cleveland Clinic Florida, Weston, Florida
| | - Michael A Bolen
- Panel Vice-Chair, Cleveland Clinic, Cleveland, Ohio, Radiology Fellowship Director for Cardiovascular CT/MRI Cleveland Clinic Main Campus
| | - Juan C Batlle
- Miami Cardiac and Vascular Institute and Baptist Health of South Florida, Miami, Florida
| | - Richard K J Brown
- University of Utah, Department of Radiology and Imaging Sciences, Salt Lake City, Utah
| | | | | | - Kate Hanneman
- Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada, Director, Cardiac Imaging Research, Department of Medical Imaging, University of Toronto
| | - Joao R Inacio
- The Ottawa Hospital, University of Ottawa, Ottawa, Ontario, Canada
| | - Amer M Johri
- Queen's University, Kingston, Ontario, Canada, Cardiology expert
| | - Daniel C Lee
- Northwestern University Feinberg School of Medicine Chicago, Illinois, Society for Cardiovascular Magnetic Resonance, Co-Director, Cardiovascular Magnetic Resonance Imaging, Northwestern University Feinberg School of Medicine
| | | | - Todd C Villines
- University of Virginia Health System, Charlottesville, Virginia, Society of Cardiovascular Computed Tomography
| | - Samuel Wann
- Wisconsin Heart Hospital, Milwaukee, Wisconsin, Nuclear cardiology expert
| | | | - Suhny Abbara
- Specialty Chair, UT Southwestern Medical Center, Dallas, Texas
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