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Kikuchi Y, Onohara D, Silverman M, King CL, Tom SK, Govin R, Guyton RA, Padala M. Mitral regurgitation increases systolic strains in remote zone and worsens left ventricular dyssynchrony in a swine model of ischemic cardiomyopathy. Front Cardiovasc Med 2024; 11:1397079. [PMID: 38863901 PMCID: PMC11165204 DOI: 10.3389/fcvm.2024.1397079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 05/14/2024] [Indexed: 06/13/2024] Open
Abstract
Background Ischemic mitral regurgitation (IMR) imposes volume overload on the left ventricle (LV), accelerating adverse LV remodeling. In this study, we sought to investigate the impact of volume overload due to IMR on regional myocardial contractile mechanics. Methods Ten Yorkshire swine were induced with myocardial infarction (MI) by occluding the left circumflex coronary artery (LCx). Cardiac MRI was performed at baseline (BL) and 2.5 months (2.5M) post-MI. IMR was quantified with epicardial echocardiography 3 months post-MI. The animals were then assigned to 2 groups: no/mild MR (nmMR, n = 4) and moderate/severe MR (msMR, n = 6). MRI images were analyzed to assess infarction size, end-diastolic and end-systolic volume (EDV and ESV, respectively), ejection fraction (EF), longitudinal strain (LS), circumferential strain (CS), and systolic dyssynchrony index (SDI). The myocardial region was divided into infarction, border, and remote zones based on the LCx-supplied region. Results There was no difference in the infarction size. Group-wise comparison of LS and CS between BL and 2.5M demonstrated that LS and CS in the infarction zone and the border zone decreased at 2.5M in both groups. However, LS and CS in the remote zone were elevated only in the msMR group (LS: -9.81 ± 3.96 vs. -12.58 ± 5.07, p < 0.01; CS; -12.78 ± 3.81 vs. -16.09 ± 3.33, p < 0.01) at 2.5M compared to BL. The SDI of CS was significantly elevated in the msMR group (0.1255 vs. 0.0974, p = 0.015) at 2.5M compared to BL. Conclusions Elevated LS and CS in the remote zone were observed in moderate/severe MR and ventricular dyssynchrony. These elevated cardiac strains, coupled with ventricular dyssynchrony, may contribute to the progression of MR, thereby accelerating heart failure.
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Affiliation(s)
- Yuta Kikuchi
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
| | - Daisuke Onohara
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
| | - Michael Silverman
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
- Department of Surgery, Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta GA, United States
| | - Chase L. King
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
- Department of Surgery, Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta GA, United States
| | - Stephanie K. Tom
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
- Department of Surgery, Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta GA, United States
| | - Riya Govin
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, United States
| | - Robert A. Guyton
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
| | - Muralidhar Padala
- Cardiothoracic Research Laboratories, Carlyle Fraser Heart Center at Emory University Hospital Midtown, Atlanta, GA, United States
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Lange T, Backhaus SJ, Schulz A, Evertz R, Schneider P, Kowallick JT, Hasenfuß G, Kelle S, Schuster A. Inter-study reproducibility of cardiovascular magnetic resonance-derived hemodynamic force assessments. Sci Rep 2024; 14:634. [PMID: 38182625 PMCID: PMC10770352 DOI: 10.1038/s41598-023-50405-9] [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: 04/19/2023] [Accepted: 12/19/2023] [Indexed: 01/07/2024] Open
Abstract
Cardiovascular magnetic resonance (CMR)-derived hemodynamic force (HDF) analyses have been introduced recently enabling more in-depth cardiac function evaluation. Inter-study reproducibility is important for a widespread clinical use but has not been quantified for this novel CMR post-processing tool yet. Serial CMR imaging was performed in 11 healthy participants in a median interval of 63 days (range 49-87). HDF assessment included left ventricular (LV) longitudinal, systolic peak and impulse, systolic/diastolic transition, diastolic deceleration as well as atrial thrust acceleration forces. Inter-study reproducibility and study sample sizes required to demonstrate 10%, 15% or 20% relative changes of HDF measurements were calculated. In addition, intra- and inter-observer analyses were performed. Intra- and inter-observer reproducibility was excellent for all HDF parameters according to intraclass correlation coefficient (ICC) values (> 0.80 for all). Inter-study reproducibility of all HDF parameters was excellent (ICC ≥ 0.80 for all) with systolic parameters showing lower coeffients of variation (CoV) than diastolic measurements (CoV 15.2% for systolic impulse vs. CoV 30.9% for atrial thrust). Calculated sample sizes to detect relative changes ranged from n = 12 for the detection of a 20% relative change in systolic impulse to n = 200 for the detection of 10% relative change in atrial thrust. Overall inter-study reproducibility of CMR-derived HDF assessments was sufficient with systolic HDF measurements showing lower inter-study variation than diastolic HDF analyses.
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Affiliation(s)
- Torben Lange
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
| | - Sören J Backhaus
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Alexander Schulz
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
| | - Ruben Evertz
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
| | - Patrick Schneider
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
| | - Johannes T Kowallick
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
- Institute for Diagnostic and Interventional Radiology, Georg-August University, University Medical Center Göttingen, Göttingen, Germany
| | - Gerd Hasenfuß
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
| | - Sebastian Kelle
- Department of Internal Medicine/Cardiology, Charité Campus Virchow Clinic, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany
| | - Andreas Schuster
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University, Robert-Koch-Str. 40, 37099, Göttingen, Germany.
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany.
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Song Y, Chen X, Yang K, Dong Z, Cui C, Zhao K, Cheng H, Ji K, Lu M, Zhao S. Cardiac MRI-derived Myocardial Fibrosis and Ventricular Dyssynchrony Predict Response to Cardiac Resynchronization Therapy in Patients with Nonischemic Dilated Cardiomyopathy. Radiol Cardiothorac Imaging 2023; 5:e220127. [PMID: 37908550 PMCID: PMC10613947 DOI: 10.1148/ryct.220127] [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: 06/20/2022] [Revised: 06/05/2023] [Accepted: 08/22/2023] [Indexed: 11/02/2023]
Abstract
Purpose To determine the association of myocardial fibrosis and left ventricular (LV) dyssynchrony measured using cardiac MRI with late gadolinium enhancement (LGE) and feature tracking (FT), respectively, with response to cardiac resynchronization therapy (CRT) for nonischemic dilated cardiomyopathy (DCM). Materials and Methods This retrospective study included 98 patients (mean age, 59 years ± 10 [SD]; 54 men) who had nonischemic DCM, as assessed with LGE cardiac MRI before CRT. Cardiac MRI FT-derived dyssynchrony was defined as the SD of the time-to-peak strain (TTP-SD) of the LV segments in three directions (longitudinal, radial, and circumferential). CRT response was defined as a 15% increase in LV ejection fraction (LVEF) at echocardiography at 6-month follow-up, and then, long-term cardiovascular events were assessed. The likelihood ratio test was used to evaluate the incremental prognostic value of LGE and dyssynchrony parameters. Results Seventy-one (72%) patients showed a favorable LVEF response following CRT. LGE presence (odds ratio: 0.14 [95% CI: 0.04, 0.47], P = .002; and hazard ratio: 3.52 [95% CI: 1.37, 9.07], P = .01) and lower circumferential TTP-SD (odds ratio: 1.04 [95% CI: 1.02, 1.07], P = .002; and hazard ratio: 0.98 [95% CI: 0.96, 1.00], P = .03) were independently associated with LVEF nonresponse and long-term outcomes. Combined LGE and circumferential TTP-SD provided the highest discrimination for LVEF nonresponse (area under the receiver operating characteristic curve [AUC]: 0.89 [95% CI: 0.81, 0.94], sensitivity: 84.5% [95% CI: 74.0%, 92.0%], specificity: 85.2% [95% CI: 66.3%, 95.8%]) and long-term outcomes (AUC: 0.84 [95% CI: 0.75, 0.91], sensitivity: 76.9% [95% CI: 56.4%, 91.0%], specificity: 87.0% [95% CI: 76.7%, 93.9%]). Conclusion Myocardial fibrosis and lower circumferential dyssynchrony assessed with pretherapy cardiac MRI were independently associated with unfavorable LVEF response and long-term events following CRT in patients with nonischemic DCM and may provide incremental value in predicting prognosis.Keywords: MR Imaging, Cardiac, Outcomes Analysis Supplemental material is available for this article. © RSNA, 2023.
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Affiliation(s)
| | | | - Kai Yang
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Zhixiang Dong
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Chen Cui
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Kankan Zhao
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Huaibing Cheng
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Keshan Ji
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Minjie Lu
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
| | - Shihua Zhao
- From the Department of Magnetic Resonance Imaging (Y.S., X.C., K.Y.,
Z.D., C.C., K.J., M.L., S.Z.), Department of Function Test Center (H.C.), and
Department of Radiology Imaging Center (S.Z.), Fuwai Hospital, National Center
for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease,
Chinese Academy of Medical Sciences and Peking Union Medical College, 167
Beilishi Road, Xi Cheng District, Beijing 100037, China; and Paul C. Lauterbur
Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced
Technology, Chinese Academy of Sciences, SZ University Town, Shenzhen, China
(K.Z.)
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Galli E, Galand V, Le Rolle V, Taconne M, Wazzan AA, Hernandez A, Leclercq C, Donal E. The saga of dyssynchrony imaging: Are we getting to the point. Front Cardiovasc Med 2023; 10:1111538. [PMID: 37063957 PMCID: PMC10103462 DOI: 10.3389/fcvm.2023.1111538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 02/27/2023] [Indexed: 04/03/2023] Open
Abstract
Cardiac resynchronisation therapy (CRT) has an established role in the management of patients with heart failure, reduced left ventricular ejection fraction (LVEF < 35%) and widened QRS (>130 msec). Despite the complex pathophysiology of left ventricular (LV) dyssynchrony and the increasing evidence supporting the identification of specific electromechanical substrates that are associated with a higher probability of CRT response, the assessment of LVEF is the only imaging-derived parameter used for the selection of CRT candidates.This review aims to (1) provide an overview of the evolution of cardiac imaging for the assessment of LV dyssynchrony and its role in the selection of patients undergoing CRT; (2) highlight the main pitfalls and advantages of the application of cardiac imaging for the assessment of LV dyssynchrony; (3) provide some perspectives for clinical application and future research in this field.Conclusionthe road for a more individualized approach to resynchronization therapy delivery is open and imaging might provide important input beyond the assessment of LVEF.
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Petersen A, Nagel SN, Hamm B, Elgeti T, Schaafs LA. Cardiac magnetic resonance imaging in patients with left bundle branch block: Patterns of dyssynchrony and implications for late gadolinium enhancement imaging. Front Cardiovasc Med 2022; 9:977414. [PMID: 36337885 PMCID: PMC9631472 DOI: 10.3389/fcvm.2022.977414] [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] [Received: 06/24/2022] [Accepted: 09/30/2022] [Indexed: 11/16/2022] Open
Abstract
Background Left bundle branch block (LBBB) is a ventricular conduction delay with high prevalence. Aim of our study is to identify possible recurring patterns of artefacts in late gadolinium enhancement (LGE) imaging in patients with LBBB who undergo cardiac magnetic resonance imaging (MRI) and to define parameters of mechanical dyssynchrony associated with artefacts in LGE images. Materials and methods Fifty-five patients with LBBB and 62 controls were retrospectively included. Inversion time (TI) scout and LGE images were reviewed for artefacts. Dyssynchrony was identified using cardiac MRI by determining left ventricular systolic dyssynchrony indices (global, septal segments, and free wall segments) derived from strain analysis and features of mechanical dyssynchrony (apical rocking and septal flash). Results Thirty-seven patients (67%) with LBBB exhibited inhomogeneous myocardial nulling in TI scout images. Among them 25 (68%) patients also showed recurring artefact patterns in the septum or free wall on LGE images and artefacts also persisted in 18 (72%) of those cases when utilising phase sensitive inversion recovery. Only the systolic dyssynchrony index of septal segments allowed differentiation of patient subgroups (artefact/no artefact) and healthy controls (given as median, median ± interquartile range); LBBB with artefact: 10.44% (0.44–20.44%); LBBB without artefact: 6.82% (-2.18–15.83%); controls: 4.38% (1.38–7.38%); p < 0.05 with an area under the curve of 0.863 (81% sensitivity, 89% specificity). Septal flash and apical rocking were more frequent in the LBBB with artefact group than in the LBBB without artefact group (70 and 62% versus 33 and 17%; p < 0.05). Conclusion Patients with LBBB show recurring artefact patterns in LGE imaging. Use of strain analysis and evaluation of mechanical dyssynchrony may predict the occurrence of such artefacts already during the examination and counteract misinterpretation.
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Rajiah PS, Kalisz K, Broncano J, Goerne H, Collins JD, François CJ, Ibrahim ES, Agarwal PP. Myocardial Strain Evaluation with Cardiovascular MRI: Physics, Principles, and Clinical Applications. Radiographics 2022; 42:968-990. [PMID: 35622493 DOI: 10.1148/rg.210174] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Myocardial strain is a measure of myocardial deformation, which is a more sensitive imaging biomarker of myocardial disease than the commonly used ventricular ejection fraction. Although myocardial strain is commonly evaluated by using speckle-tracking echocardiography, cardiovascular MRI (CMR) is increasingly performed for this purpose. The most common CMR technique is feature tracking (FT), which involves postprocessing of routinely acquired cine MR images. Other CMR strain techniques require dedicated sequences, including myocardial tagging, strain-encoded imaging, displacement encoding with stimulated echoes, and tissue phase mapping. The complex systolic motion of the heart can be resolved into longitudinal strain, circumferential strain, radial strain, and torsion. Myocardial strain metrics include strain, strain rate, displacement, velocity, torsion, and torsion rate. Wide variability exists in the reference ranges for strain dependent on the imaging technique, analysis software, operator, patient demographics, and hemodynamic factors. In anticancer therapy cardiotoxicity, CMR myocardial strain can help identify left ventricular dysfunction before the decline of ejection fraction. CMR myocardial strain is also valuable for identifying patients with left ventricle dyssynchrony who will benefit from cardiac resynchronization therapy. CMR myocardial strain is also useful in ischemic heart disease, cardiomyopathies, pulmonary hypertension, and congenital heart disease. The authors review the physics, principles, and clinical applications of CMR strain techniques. Online supplemental material is available for this article. ©RSNA, 2022.
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Affiliation(s)
- Prabhakar Shantha Rajiah
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - Kevin Kalisz
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - Jordi Broncano
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - Harold Goerne
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - Jeremy D Collins
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - Christopher J François
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - El-Sayed Ibrahim
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
| | - Prachi P Agarwal
- From the Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 559905 (P.S.R., J.D.C., C.J.F.); Department of Radiology, Duke University Medical Center, Durham, NC (K.K.); Department of Radiology, Hospital San Juan de Dios, Hospital de la Cruz Roja, HT-RESALTA, HT Médica, Córdoba, Spain (J.B.); Department of Radiology, Division of Cardiac Imaging, Imaging and Diagnostic Center CID, Guadalajara, Mexico (H.G.); Department of Radiology, Medical College of Wisconsin, Milwaukee, Wis (E.S.I.); and Department of Radiology, University of Michigan, Ann Arbor, Mich (P.P.A.)
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Rajiah P, François CJ. Cardiac MRI for Left Ventricular Dyssynchrony: Time for Coordinated Response. Radiol Cardiothorac Imaging 2021; 3:e210193. [PMID: 34498012 PMCID: PMC8415138 DOI: 10.1148/ryct.2021210193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/12/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Affiliation(s)
- Prabhakar Rajiah
- From the Department of Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905
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Quantification of Myocardial Deformation Applying CMR-Feature-Tracking-All About the Left Ventricle? Curr Heart Fail Rep 2021; 18:225-239. [PMID: 33931818 PMCID: PMC8342400 DOI: 10.1007/s11897-021-00515-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/15/2021] [Indexed: 11/11/2022]
Abstract
Purpose of Review Cardiac magnetic resonance-feature-tracking (CMR-FT)-based deformation analyses are key tools of cardiovascular imaging and applications in heart failure (HF) diagnostics are expanding. In this review, we outline the current range of application with diagnostic and prognostic implications and provide perspectives on future trends of this technique. Recent Findings By applying CMR-FT in different cardiovascular diseases, increasing evidence proves CMR-FT-derived parameters as powerful diagnostic and prognostic imaging biomarkers within the HF continuum partly outperforming traditional clinical values like left ventricular ejection fraction. Importantly, HF diagnostics and deformation analyses by CMR-FT are feasible far beyond sole left ventricular performance evaluation underlining the holistic nature and accuracy of this imaging approach. Summary As an established and continuously evolving technique with strong prognostic implications, CMR-FT deformation analyses enable comprehensive cardiac performance quantification of all cardiac chambers.
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Stiermaier T, Backhaus SJ, Lange T, Koschalka A, Navarra JL, Boom P, Lamata P, Kowallick JT, Lotz J, Gutberlet M, de Waha-Thiele S, Desch S, Hasenfuß G, Thiele H, Eitel I, Schuster A. Cardiac Magnetic Resonance Left Ventricular Mechanical Uniformity Alterations for Risk Assessment After Acute Myocardial Infarction. J Am Heart Assoc 2019; 8:e011576. [PMID: 31387432 PMCID: PMC6759895 DOI: 10.1161/jaha.118.011576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Background Despite limitations as a stand-alone parameter, left ventricular (LV) ejection fraction is the preferred measure of myocardial function and marker for postinfarction risk stratification. LV myocardial uniformity alterations may provide superior prognostic information after acute myocardial infarction, which was the subject of this study. Methods and Results Consecutive patients with acute myocardial infarction (n=1082; median age: 63 years; 75% male) undergoing cardiac magnetic resonance at a median of 3 days after infarction were included in this multicenter observational study. Circumferential and radial uniformity ratio estimates were derived from cardiac magnetic resonance feature tracking as markers of mechanical uniformity alterations (values between 0 and 1 with 1 reflecting perfect uniformity). The clinical end point was the 12-month rate of major adverse cardiac events, consisting of all-cause death, reinfarction, and new congestive heart failure. Patients with major adverse cardiac events (n=73) had significantly impaired circumferential uniformity ratio estimates (0.76 [interquartile range: 0.67-0.86] versus 0.84 [interquartile range: 0.76-0.89]; P<0.001) and radial uniformity ratio estimates (0.69 [interquartile range: 0.60-0.79] versus 0.76 [interquartile range: 0.67-0.83]; P<0.001) compared with patients without events. Although uniformity estimates did not provide independent prognostic information in the overall cohort, a circumferential uniformity ratio estimate below the median of 0.84 emerged as an independent predictor of outcome in postinfarction patients with LV ejection fraction >35% (n=959), even after adjustment for established risk factors (hazard ratio: 1.99; 95% CI, 1.06-3.74; P=0.033 in multivariable Cox regression analysis). In contrast, LV ejection fraction was not associated with adverse events in this subgroup of patients with acute myocardial infarction. Conclusions Cardiac magnetic resonance-derived estimates of mechanical uniformity alterations are novel markers for risk assessment after acute myocardial infarction, and the circumferential uniformity ratio estimate provides independent prognostic information for patients with preserved or only moderately reduced LV ejection fraction.
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Affiliation(s)
- Thomas Stiermaier
- Medical Clinic II (Cardiology/Angiology/Intensive Care Medicine) University Heart Center Lübeck University Hospital Schleswig-Holstein Lübeck Germany.,German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck Lübeck Germany
| | - Sören J Backhaus
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany
| | - Torben Lange
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany
| | - Alexander Koschalka
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany
| | - Jenny-Lou Navarra
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany
| | - Patricia Boom
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany
| | - Pablo Lamata
- Department of Biomedical Engineering School of Biomedical Engineering and Imaging Sciences King's College of London London United Kingdom
| | - Johannes T Kowallick
- German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany.,Institute for Diagnostic and Interventional Radiology University Medical Center Göttingen Georg-August University Göttingen Germany
| | - Joachim Lotz
- German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany.,Institute for Diagnostic and Interventional Radiology University Medical Center Göttingen Georg-August University Göttingen Germany
| | - Matthias Gutberlet
- Department of Radiology Heart Center Leipzig at University of Leipzig Germany
| | - Suzanne de Waha-Thiele
- Medical Clinic II (Cardiology/Angiology/Intensive Care Medicine) University Heart Center Lübeck University Hospital Schleswig-Holstein Lübeck Germany.,German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck Lübeck Germany
| | - Steffen Desch
- Department of Internal Medicine/Cardiology Heart Center Leipzig at University of Leipzig Germany
| | - Gerd Hasenfuß
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany
| | - Holger Thiele
- Department of Internal Medicine/Cardiology Heart Center Leipzig at University of Leipzig Germany
| | - Ingo Eitel
- Medical Clinic II (Cardiology/Angiology/Intensive Care Medicine) University Heart Center Lübeck University Hospital Schleswig-Holstein Lübeck Germany.,German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck Lübeck Germany
| | - Andreas Schuster
- Department of Cardiology and Pneumology University Medical Center Göttingen Georg-August University Göttingen Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen Göttingen Germany.,Department of Biomedical Engineering School of Biomedical Engineering and Imaging Sciences King's College of London London United Kingdom.,Department of Cardiology Royal North Shore Hospital The Kolling Institute Northern Clinical School University of Sydney Australia
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10
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Backhaus SJ, Stiermaier T, Lange T, Chiribiri A, Lamata P, Uhlig J, Kowallick JT, Raaz U, Villa A, Lotz J, Hasenfuß G, Thiele H, Eitel I, Schuster A. Temporal changes within mechanical dyssynchrony and rotational mechanics in Takotsubo syndrome: A cardiovascular magnetic resonance imaging study. Int J Cardiol 2018; 273:256-262. [PMID: 30195843 PMCID: PMC6236127 DOI: 10.1016/j.ijcard.2018.04.088] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 04/13/2018] [Accepted: 04/20/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND The pathophysiological significance of dyssynchrony and rotation in Takotsubo syndrome (TTS) is unknown. We aimed to define the influence of cardiovascular magnetic resonance feature tracking (CMR-FT) dyssynchrony and rotational mechanics in acute and during clinical course of TTS. METHODS This multicenter study included 152 TTS patients undergoing CMR (mean 3 days after symptom onset). Apical, midventricular and basal short axis views were analysed in a core-laboratory. Systolic torsion, diastolic recoil and dyssynchrony expressed as circumferential and radial uniformity ratio estimates (CURE and RURE: 0 to 1; 1 = perfect synchrony) were compared to a matched control group (n = 21). Follow-up CMR (n = 20 patients; mean 62 days, SD 7.2) and general follow-up (n = 136; mean 3.3 years, SD 2.4) were performed. RESULTS CURE was initially reduced compared to controls (p = 0.001) and recovered at follow-up (p < 0.001) as opposed to RURE (p = 0.116 and p = 0.179). CURE and RURE discriminated between ballooning patterns (p = 0.001 and p = 0.045). Recoil was generally impaired during the acute phase (p = 0.015), torsion only in highly dyssynchronous patients (p = 0.024). Diabetes (p = 0.007), physical triggers (p = 0.013) and malignancies (p = 0.001) predicted mortality. The latter showed a distinct association with impaired torsion (p = 0.042) and dyssynchrony (p = 0.047). Physical triggers and malignancies were related to biventricular impairment (p = 0.004 and p = 0.026), showing higher dyssynchrony (p < 0.01), greater reduction of left ventricular function (p < 0.001) and a strong trend towards increased mortality (p = 0.074). CONCLUSION Transient circumferential dyssynchrony and impaired rotational mechanics are distinct features of TTS with different severities according to the pattern of ballooning. Patients with malignancies and precipitating physical triggers frequently show biventricular affection, greater dyssynchrony and high mortality risk.
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Affiliation(s)
- Sören J Backhaus
- University Medical Center Göttingen, Department of Cardiology and Pneumology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Thomas Stiermaier
- University Heart Center Lübeck, Medical Clinic II (Cardiology/Angiology/Intensive Care Medicine), University Hospital Schleswig-Holstein, Lübeck, Germany and German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Lübeck, Germany
| | - Torben Lange
- University Medical Center Göttingen, Department of Cardiology and Pneumology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Amedeo Chiribiri
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK
| | - Pablo Lamata
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK
| | - Johannes Uhlig
- University Medical Center Göttingen, Institute for Diagnostic and Interventional Radiology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Johannes T Kowallick
- University Medical Center Göttingen, Institute for Diagnostic and Interventional Radiology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Uwe Raaz
- University Medical Center Göttingen, Department of Cardiology and Pneumology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Adriana Villa
- Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK
| | - Joachim Lotz
- University Medical Center Göttingen, Institute for Diagnostic and Interventional Radiology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Gerd Hasenfuß
- University Medical Center Göttingen, Department of Cardiology and Pneumology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Holger Thiele
- Heart Center Leipzig, University of Leipzig, Department of Internal Medicine/Cardiology, Leipzig, Germany
| | - Ingo Eitel
- University Heart Center Lübeck, Medical Clinic II (Cardiology/Angiology/Intensive Care Medicine), University Hospital Schleswig-Holstein, Lübeck, Germany and German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Lübeck, Germany.
| | - Andreas Schuster
- University Medical Center Göttingen, Department of Cardiology and Pneumology, Georg-August University, Göttingen Germany and German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany; Department of Cardiology, Royal North Shore Hospital, The Kolling Institute, Northern Clinical School, University of Sydney, Sydney, Australia.
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11
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Steinmetz M, Usenbenz S, Kowallick JT, Hösch O, Staab W, Lange T, Kutty S, Lotz J, Hasenfuß G, Paul T, Schuster A. Left ventricular synchrony, torsion, and recoil mechanics in Ebstein's anomaly: insights from cardiovascular magnetic resonance. J Cardiovasc Magn Reson 2017; 19:101. [PMID: 29237468 PMCID: PMC5729283 DOI: 10.1186/s12968-017-0414-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 11/23/2017] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Disease progression and heart failure development in Ebstein's Anomaly (EA) of the tricuspid valve is characterized by both right and left ventricular (LV) deterioration. The mechanisms underlying LV dysfunction and their role in heart failure development are incompletely understood. We hypothesized that LV dyssynchrony and impaired torsion and recoil mechanics induced by paradoxical movement of the basal septum may play a role in heart failure development. METHODS 31 EA patients and 31 matched controls underwent prospective cardiovascular magnetic resonance (CMR). CMR feature tracking (CMR-FT) was performed on apical, midventricular and basal short-axis and 4D-volume analysis was performed using three long-axis views and a short axis cine stack employing dedicated software. Circumferential uniformity ratio estimates (CURE) time-to-peak-based circumferential systolic dyssynchrony index (C-SDI), 4D volume analysis derived SDI (4D-SDI), torsion (Tor) and systolic (sysTR) and diastolic torsion rate (diasTR) were calculated for the LV. QRS duration, brain natriuretic peptide, NYHA and Total R/L-Volume Index (R/L Index) were obtained. RESULTS EA patients (31.5 years; controls 31.4 years) had significantly longer QRS duration (123.35 ms ± 26.36 vs. 97.33 ms ± 11.89 p < 0.01) and showed more LV dyssynchrony (4D-SDI 7.60% ± 4.58 vs. 2.54% ± 0.62, p < 0.001; CURE 0.77 ± 0.05 vs. 0.86 ± 0.03, p < 0.001; C-SDI 7.70 ± 3.38 vs. 3.80 ± 0.91, p = 0.001). There were significant associations of LV dyssynchrony with heart failure parameters and QRS duration. Although torsion and recoil mechanics did not differ significantly (p > 0.05) there was an association of torsion and recoil mechanics with dyssynchrony parameters CURE (sysTR r = -0.426; p = 0.017, diasTR r = 0.419; p = 0.019), 4D-SDI (sysTR r = 0.383; p = 0.044) and C-SDI (diasTR r = -0.364; p = 0.044). CONCLUSIONS EA is characterized by LV intra-ventricular dyssynchrony, which is associated with heart failure and disease severity parameters. Markers of dyssynchrony can easily be quantified from CMR-FT, and may have a role in the assessment of altered cardiac function, carrying potential management implications for EA patients.
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Affiliation(s)
- Michael Steinmetz
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg-August University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Simon Usenbenz
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg-August University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Johannes Tammo Kowallick
- Institute for Diagostic and Interventional Radiology, Georg-August-University Göttingen, University Medical Center, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Olga Hösch
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg-August University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Göttingen, Germany
| | - Wieland Staab
- Institute for Diagostic and Interventional Radiology, Georg-August-University Göttingen, University Medical Center, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Torben Lange
- Department of Cardiology and Pneumology, Georg-August-University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Götttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Shelby Kutty
- University of Nebraska Medical Center/ Children’s Hospital and Medical Center, Omaha, NE USA
| | - Joachim Lotz
- Institute for Diagostic and Interventional Radiology, Georg-August-University Göttingen, University Medical Center, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Gerd Hasenfuß
- Department of Cardiology and Pneumology, Georg-August-University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Götttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Thomas Paul
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg-August University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Andreas Schuster
- Department of Cardiology and Pneumology, Georg-August-University Göttingen, University Medical Center, Robert-Koch-Str. 40, D-37099 Götttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
- Department of Cardiology, Royal North Shore Hospital, The Kolling Institute, Nothern Clinical School, University of Sydney, Sydney, Australia
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