Yousef Etoom1, Sindu Govindapillai1, Robert Hamilton1, Cedric Manlhiot1, Shi-Joon Yoo2, Maryam Farhan1, Samir Sarikouch3, Brigitte Peters4, Brian W McCrindle1, Lars Grosse-Wortmann5. 1. The Labatt Family Heart Centre, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, Canada. 2. The Labatt Family Heart Centre, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, Canada; Department of Diagnostic Imaging, The Hospital for Sick Children, University of Toronto, Toronto, Canada. 3. Department of Heart, Thoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Germany. 4. Institute for Biometry and Medical Informatics, University of Magdeburg, Magdeburg, Germany. 5. The Labatt Family Heart Centre, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, Canada; Department of Diagnostic Imaging, The Hospital for Sick Children, University of Toronto, Toronto, Canada. Electronic address: lars.grosse-wortmann@sickkids.ca.
Abstract
BACKGROUND: Cardiac magnetic resonance (CMR) is a component of the revised Task Force Criteria (rTFC) for the diagnosis of arrhythmogenic right ventricular cardiomyopathy (ARVC). However, its diagnostic value in a pediatric population is unknown. OBJECTIVES: This study examined the contribution of CMR to diagnosing ARVC using the rTFC in a pediatric population. METHODS: Clinical CMR studies of 142 pediatric patients evaluated for ARVC between 2005 and 2009 were reviewed. Patients were categorized into "definitive," "borderline," "possible," or "no" ARVC diagnostic groups based on the rTFC. The extent to which each element of the rTFC contributed to diagnosing ARVC was determined using a c-statistics model. RESULTS: A total of 23 (16%), 32 (23%), 37 (26%), and 50 (35%) patients had definite, borderline, possible, and no ARVC, respectively, applying the rTFC. The prevalence of regional wall motion abnormalities in these groups was 83%, 53%, 22%, and 16%, respectively (p < 0.001). By CMR, right ventricular end-diastolic volumes were 118 ± 31 cc/m², 108 ± 22 cc/m², 94 ± 14 cc/m², and 92 ± 18 cc/m², respectively (p < 0.001). Right ventricular fatty infiltration and fibrosis were detected in only 1 and 3 patients, respectively, all of whom had definitive ARVC. Of all rTFC major criteria, CMR had the largest c-statistic decline (c = -0.163). Eleven of the 23 patients (48%) with definite ARVC would not have been in this group if CMR had not been performed. CONCLUSIONS: CMR parameters are important contributors to a diagnosis of ARVC in children, using the rTFC. Fatty infiltration and myocardial fibrosis provide limited value in children and adolescents.
BACKGROUND: Cardiac magnetic resonance (CMR) is a component of the revised Task Force Criteria (rTFC) for the diagnosis of arrhythmogenic right ventricular cardiomyopathy (ARVC). However, its diagnostic value in a pediatric population is unknown. OBJECTIVES: This study examined the contribution of CMR to diagnosing ARVC using the rTFC in a pediatric population. METHODS: Clinical CMR studies of 142 pediatric patients evaluated for ARVC between 2005 and 2009 were reviewed. Patients were categorized into "definitive," "borderline," "possible," or "no" ARVC diagnostic groups based on the rTFC. The extent to which each element of the rTFC contributed to diagnosing ARVC was determined using a c-statistics model. RESULTS: A total of 23 (16%), 32 (23%), 37 (26%), and 50 (35%) patients had definite, borderline, possible, and no ARVC, respectively, applying the rTFC. The prevalence of regional wall motion abnormalities in these groups was 83%, 53%, 22%, and 16%, respectively (p < 0.001). By CMR, right ventricular end-diastolic volumes were 118 ± 31 cc/m², 108 ± 22 cc/m², 94 ± 14 cc/m², and 92 ± 18 cc/m², respectively (p < 0.001). Right ventricular fatty infiltration and fibrosis were detected in only 1 and 3 patients, respectively, all of whom had definitive ARVC. Of all rTFC major criteria, CMR had the largest c-statistic decline (c = -0.163). Eleven of the 23 patients (48%) with definite ARVC would not have been in this group if CMR had not been performed. CONCLUSIONS: CMR parameters are important contributors to a diagnosis of ARVC in children, using the rTFC. Fatty infiltration and myocardial fibrosis provide limited value in children and adolescents.
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