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Madias JE. Electrocardiogram repolarization markers and ventricular arrhythmias in patients with takotsubo syndrome. Curr Probl Cardiol 2024; 49:102757. [PMID: 39059781 DOI: 10.1016/j.cpcardiol.2024.102757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2024] [Accepted: 07/23/2024] [Indexed: 07/28/2024]
Abstract
The predictive value of various ECG repolarization markers for the emergence of VA in patients with TTS was reviewed. The literature reports on QT, more recently on Tpe, and rarely on some more QT-derived metrics, revealing a contribution of these variables for the prediction of VA, complicating the acute, subacute, and follow-up clinical trajectory of patients with TTS. More recent literature reveals that Tpe and some other QT-based metrics, have outperformed the traditionally employed QT marker, although certainty about this awaits confirmation by future carefully designed and implemented studies.
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Affiliation(s)
- John E Madias
- Icahn School of Medicine at Mount Sinai, New York, NY, United States; Division of Cardiology, Elmhurst Hospital Center, 79-01 Broadway, Elmhurst, NY 11373, United States.
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La Vecchia G, Del Buono MG, Sanna T, Capecchi PL, Lazzerini PE, Golino M, Kron J, Rodriguez-Miguelez P, Pelargonio G, Abbate A. Life-Threatening Arrhythmias in Patients With Takotsubo Syndrome: Insights Into Pathophysiology and Treatment Innovations. JACC Clin Electrophysiol 2024; 10:1943-1952. [PMID: 38842970 DOI: 10.1016/j.jacep.2024.03.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/26/2024] [Accepted: 03/31/2024] [Indexed: 08/30/2024]
Abstract
Takotsubo syndrome (TTS) is a reversible form of acute myocardial injury due to a neurocardiogenic mechanism associated with a relevant risk for life-threatening ventricular arrhythmias, occurring in up to 25% of all patients and including both ventricular arrhythmias (especially) in the context of QT prolongation and atrial tachy- or bradyarrhythmias. The pathogenetic mechanisms of TTS-related arrhythmic complications are not completely understood, and there are no randomized clinical trials addressing the pharmacologic and nonpharmacologic management in this specific setting. In this narrative review, the authors provide an overview of the pathogenesis and the therapeutic management of arrhythmic complications in patients with TTS, along with the future perspectives and the remaining knowledge gaps in this field.
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Affiliation(s)
- Giulia La Vecchia
- Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart, Rome, Italy; Operative Unit of Diagnostic Interventional Cardiology, Isola Tiberina-Gemelli Isola, Rome, Italy
| | - Marco Giuseppe Del Buono
- Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart, Rome, Italy; Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Tommaso Sanna
- Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart, Rome, Italy; Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Pier Leopoldo Capecchi
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Division of Internal Medicine, Electroimmunology Unit, University Hospital "Le Scotte," Siena, Italy
| | - Pietro Enea Lazzerini
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Division of Internal Medicine, Electroimmunology Unit, University Hospital "Le Scotte," Siena, Italy
| | - Michele Golino
- Pauley Heart Center, Virginia Commonwealth University, Richmond, Virginia, USA; Robert M. Berne Cardiovascular Research Center and Division of Cardiology, University of Virginia, Charlottesville, Virginia, USA
| | - Jordana Kron
- Pauley Heart Center, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Paula Rodriguez-Miguelez
- Department of Kinesiology and Health Sciences, Virginia Commonwealth University, Richmond, Virginia, USA; Division of Pulmonary and Critical Care, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Gemma Pelargonio
- Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart, Rome, Italy; Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Antonio Abbate
- Robert M. Berne Cardiovascular Research Center and Division of Cardiology, University of Virginia, Charlottesville, Virginia, USA.
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3
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Chedid M, Buda KG, Iqbal O, Simegn M. Predictors of Polymorphic Ventricular Tachycardia and Ventricular Fibrillation in Patients With Takotsubo Syndrome. Am J Cardiol 2024; 222:101-107. [PMID: 38703882 DOI: 10.1016/j.amjcard.2024.04.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 03/21/2024] [Accepted: 04/26/2024] [Indexed: 05/06/2024]
Abstract
Polymorphic ventricular tachycardia (PVT) and ventricular fibrillation (VF) are life-threatening complications of takotsubo syndrome (TTS). Data regarding risk factors for PVT/VF based on the TTS variant are lacking. This study aimed to identify demographic and clinical factors associated with PVT and VF in patients with TTS. Patients meeting the InterTak criteria for TTS between 2010 and 2022 were retrospectively identified. The occurrence of PVT/VF with each risk factor was analyzed using logistic regression. Sensitivity analysis was performed to assess the interaction between risk factors. PVT/VF occurred in 27 of 296 patients with TTS (9.1%). Patients with PVT/VF were younger (52 vs 62 years, p = 0.019) and more frequently used stimulants in the 4 weeks before admission (22.2% vs 8.2%, odds ratio [OR] 3.20, p = 0.023). All PVT/VF occurred within 24 hours of hospitalization. An initial QTc threshold of 490 ms had the highest sensitivity and specificity for the occurrence of PVT/VF (area under the curve = 0.687). Patients with PVT/VF were more likely to have a QTc >490 ms on admission (55.6% vs 18.7%, OR 5.45, p <0.01), apical variant TTS (78% vs 56%, OR 2.69, p = 0.038), and an admission ejection fraction <30% (63% vs 41.5%, OR 2.39, p = 0.032); each factor was independently associated with PVT/VF irrespective of QTc duration on sensitivity analysis. In conclusion, nearly 1 in 10 patients with TTS had PVT/VF. A QTc >490 ms, recent stimulant use, apical variant TTS, and severe left ventricular systolic dysfunction on admission are associated with higher PVT/VF risk, with the first 24 hours being a high-risk period.
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Affiliation(s)
- Maroun Chedid
- Department of Medicine, Hennepin Healthcare, Minneapolis, MN
| | - Kevin G Buda
- Division of Cardiology, Department of Internal Medicine, Hennepin Healthcare, Minneapolis, Minnesota; Division of Cardiology, Minneapolis Heart Institute at Abbott Northwestern Hospital, Minneapolis, Minnesota
| | - Omer Iqbal
- Division of Cardiology, Department of Internal Medicine, Hennepin Healthcare, Minneapolis, Minnesota; Division of Cardiology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Mengistu Simegn
- Division of Cardiology, Department of Internal Medicine, Hennepin Healthcare, Minneapolis, Minnesota; Division of Cardiology, University of Minnesota Medical School, Minneapolis, Minnesota; Division of Cardiology, Minneapolis Veterans Affairs Medical Center, Minneapolis, Minnesota.
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Zha F, Li X, Yin H, Huang D, Du Y, Zhou C. Case report: A 56-year-old woman presenting with torsades de pointes and cardiac arrest associated with levosimendan administration and underlying congenital long QT syndrome type 1. Heliyon 2024; 10:e29300. [PMID: 38644859 PMCID: PMC11033119 DOI: 10.1016/j.heliyon.2024.e29300] [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: 04/07/2023] [Revised: 03/30/2024] [Accepted: 04/04/2024] [Indexed: 04/23/2024] Open
Abstract
Torsades de Pointes (TdP) is a malignant polymorphic ventricular tachycardia with heart rate corrected QT interval (QTc) prolongation, which may be attributed to congenital and acquired factors. Although various acquired factors for TdP have been summarized, levosimendan administration in complex postoperative settings is relatively uncommon. Timely identification of potential causes and appropriate management may improve the outcome. Herein, we describe the postoperative case of a 56-year-old female with initial normal QTc who accepted the administration of levosimendan for heart failure, suffered TdP, cardiac arrest, and possible Takotsubo cardiomyopathy, further genetically confirmed as long QT syndrome type 1 (LQT1). The patient was successfully treated with magnesium sulfate, atenolol, and implantable cardioverter defibrillator implantation. There should be a careful evaluation of the at-risk populations and close monitoring of the electrocardiograms, particularly the QT interval, to reduce the risk of near-fatal arrhythmias during the use of levosimendan.
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Affiliation(s)
- Fengyan Zha
- Department of Surgical Intensive Care Unit, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, SZ, China
| | - Xing Li
- Department of Surgical Intensive Care Unit, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, SZ, China
| | - Hui Yin
- Department of Surgical Intensive Care Unit, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, SZ, China
| | - Di Huang
- Department of Surgical Intensive Care Unit, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, SZ, China
| | - Yu Du
- Department of Surgical Intensive Care Unit, Fuwai Hospital Chinese Academy of Medical Sciences, Beijing, BJ, China
| | - Chuzhi Zhou
- Department of Surgical Intensive Care Unit, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, SZ, China
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Banai A, Retsky R, Lupu L, Levi E, Zahler D, Feder O, Merin R, Topilsky Y, Rosso R, Banai S, Viskin S, Chorin E. Electromechanical Window and Spontaneous Ventricular Tachyarrhythmias in Takotsubo Syndrome. Am J Cardiol 2024; 210:100-106. [PMID: 38682708 DOI: 10.1016/j.amjcard.2023.10.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 09/28/2023] [Accepted: 10/05/2023] [Indexed: 05/01/2024]
Abstract
QT interval prolongation is common in patients hospitalized with Takotsubo syndrome (TTS), however, only a minority experience ventricular tachyarrhythmias. Our aim was to characterize the electromechanical window (EMW) in patients with TTS and to evaluate its association with ventricular tachyarrhythmias. We preformed aretrospective analysis of 84 patients hospitalized with TTS in the Tel-Aviv Medical Center between 2013 and 2022. All patients underwent a comprehensive echocardiographic evaluation and the EMW was calculated by subtracting the QT interval from the QRS onset to the aortic valve closure obtained from a continuous-wave Doppler for the same beat. Of the 84 patients with TTS, 74 (88%) were female and the mean age was 70 ± 11 years. The mean left ventricular ejection fraction was 42 ± 8%. The EMW was negative in 81 patients (96%), and the mean EMW was -69 ± 50 ms. Ventricular tachyarrhythmias occurred in 7 patients (8%). The EMW of patients who experienced ventricular tachyarrhythmias was more negative than patients who did not (-133 ± 23 ms vs -63 ± 48 ms, p = 0.001). In the univariate analysis, EMW and QT were associated with ventricular tachyarrhythmias (univariate odds ratio [OR]EMW 1.03, 95% confidence interval [CI] 1.01 to 1.05, p = 0.003 and univariate ORQTc 1.02, 95% CI 1.01 to 1.03, p = 0.02); however, only EMW remained significant in the multivariate analysis (OREMW 1.03 95% CI 1.03 to 1.05, p = 0.023). EMW was more effective than corrected QT interval in identifying patients who had ventricular tachyarrhythmias (AUCEMW: 0.89, 95% CI 0.82 to 0.97 vs AUCQTc 0.77, 95% CI 0.61 to 0.93, p = 0.02), and a cut-off value of -108 ms was predictive of ventricular tachyarrhythmias with a sensitivity of 86% and a specificity of 79%. In conclusion, EMW is negative in patients with TTS and is associated with increased risk for ventricular tachyarrhythmias. The role of EMW in the risk stratification of patients with TTS warrants further investigation.
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Affiliation(s)
- Ariel Banai
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
| | - Rachel Retsky
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Lior Lupu
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Erez Levi
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - David Zahler
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Omri Feder
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Roei Merin
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Yan Topilsky
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Raphael Rosso
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Shmuel Banai
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Sami Viskin
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Ehud Chorin
- Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Cardiology Division, Tel-Aviv Sourasky Medical Center Affiliated to the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
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Sadlonova M, Beach SR, Funk MC, Rosen JH, Ramirez Gamero AF, Karlson RA, Huffman JC, Celano CM. Risk Stratification of QTc Prolongation in Critically Ill Patients Receiving Antipsychotics for the Management of Delirium Symptoms. J Intensive Care Med 2023:8850666231222470. [PMID: 38130132 DOI: 10.1177/08850666231222470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
BACKGROUND Patients experiencing significant agitation or perceptual disturbances related to delirium in an intensive care setting may benefit from short-term treatment with an antipsychotic medication. Some antipsychotic medications may prolong the QTc interval, which increases the risk of potentially fatal ventricular arrhythmias. In this targeted review, we describe the evidence regarding the relationships between antipsychotic medications and QTc prolongation and practical methods for monitoring the QTc interval and mitigating arrhythmia risk. METHODS Searches of PubMed and Cochrane Library were performed to identify studies, published before February 2023, investigating the relationships between antipsychotic medications and QTc prolongation or arrhythmias. RESULTS Most antipsychotic medications commonly used for the management of delirium symptoms (eg, intravenous haloperidol, olanzapine, quetiapine) cause a moderate degree of QTc prolongation. Among other antipsychotics, those most likely to cause QTc prolongation are iloperidone and ziprasidone, while aripiprazole and lurasidone appear to have minimal risk for QTc prolongation. Genetic vulnerabilities, female sex, older age, pre-existing cardiovascular disease, electrolyte abnormalities, and non-psychiatric medications also increase the risk of QTc prolongation. For individuals at risk of QTc prolongation, it is essential to measure the QTc interval accurately and consistently and consider medication adjustments if needed. CONCLUSIONS Antipsychotic medications are one of many risk factors for QTc prolongation. When managing agitation related to delirium, it is imperative to assess an individual patient's risk for QTc prolongation and to choose a medication and monitoring strategy commensurate to the risks. In intensive care settings, we recommend regular ECG monitoring, using a linear regression formula to correct for heart rate. If substantial QTc prolongation (eg, QTc > 500 msec) is present, a change in pharmacologic treatment can be considered, though a particular medication may still be warranted if the risks of discontinuation (eg, extreme agitation, removal of invasive monitoring devices) outweigh the risks of arrhythmias. AIMS This review aims to summarize the current literature on relationships between antipsychotic medications and QTc prolongation and to make practical clinical recommendations towards the approach of antipsychotic medication use for the management of delirium-related agitation and perceptual disturbances in intensive care settings.
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Affiliation(s)
- Monika Sadlonova
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
- Department of Psychosomatic Medicine and Psychotherapy, University of Göttingen Medical Center, Göttingen, Germany
- Department of Cardiovascular and Thoracic Surgery, University of Göttingen Medical Center, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Scott R Beach
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - Margo C Funk
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
- Department of Psychiatry, Brigham and Women's Hospital, Boston, MA, USA
| | - Jordan H Rosen
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
- Department of Psychiatry, Brigham and Women's Hospital, Boston, MA, USA
| | - Andres F Ramirez Gamero
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - Rebecca A Karlson
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
| | - Jeff C Huffman
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - Christopher M Celano
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
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Pinho AI, Oliveira C, Santos LD, Marques C, Cabrita A, Dias P, Pestana G, Sousa C, Rodrigues RA. QT interval prolongation in Takotsubo syndrome: a frightening feature with no major prognostic impact. Monaldi Arch Chest Dis 2023. [PMID: 38058291 DOI: 10.4081/monaldi.2023.2834] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 12/04/2023] [Indexed: 12/08/2023] Open
Abstract
Despite the frequent and often severe repolarization abnormalities seen in Takotsubo syndrome (TTS), the underlying mechanism of life-threatening arrhythmias is incompletely understood, and the risk remains uncertain. TTS is considered a potential cause of acquired long QT syndrome; however, there is no robust evidence that QT prolongation has a major prognostic impact on these patients' outcomes. Our aim was to assess the prevalence and clinical implications of acquired long QT during TTS events and compare in-hospital and long-term outcomes between patients with and without corrected QT interval (QTc) prolongation. This is a retrospective cohort study that included 113 patients admitted to our tertiary care hospital with a diagnosis of TTS. The cohort was divided into two groups: a long QTc group (QTc≥460 milliseconds in any electrocardiogram at admission or during hospitalization) and a normal QTc group. Baseline characteristics, occurrences during hospitalization, and outcome data were obtained from the revision of medical registries and hospital visits. Of the 113 patients, 107 (94.7%) were female. The mean age was 67.6±11.7 years. QTc prolongation was found in 38%. Demographic characteristics, relevant chronic medication, prevalence of cardiovascular risk factors, and other comorbidities were similar between the groups, except for history of atrial fibrillation, which was more common in the long QTc group. Syncope was more prevalent in the long QTc group. In-hospital complications were not statistically different between patients with long and normal QTc (48.8% versus 44.2%, p=0.637), including ventricular arrhythmias and complete atrioventricular block (both 4.7% versus 1.4%, p=0.556). In-hospital mortality was 0.9%, corresponding to one patient in the long QTc group. The mean follow-up time was 4.8±3.8 years. 5-year all-cause mortality and the occurrence of the composite endpoint of major adverse cardiac and cerebrovascular events did not differ between the groups (p=0.511 and p=0.538, respectively). Our study found no association between prolonged QTc interval during TTS events and adverse prognosis, since in-hospital and long-term outcomes were similar between the groups. Our findings suggest that, although QT prolongation is usually a frightening feature on ECG, this repolarization abnormality during the acute phase has no major prognostic implications in the TTS population.
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Affiliation(s)
- Ana Isabel Pinho
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - Cátia Oliveira
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - Luís Daniel Santos
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - Catarina Marques
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - André Cabrita
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - Paula Dias
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - Gonçalo Pestana
- Department of Cardiology, University Hospital Center of São João, Porto.
| | - Carla Sousa
- Department of Cardiology, University Hospital Center of São João, Porto; Cardiovascular Research and Development Center, Faculty of Medicine, University of Porto.
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