Abstract
This study aimed to identify clinical, electrocardiographic (ECG) and cardiac imaging predictors of first-time life-threatening ventricular arrhythmia in patients with arrhythmogenic cardiomyopathy (AC). The role of clinical, electrocardiographic, and cardiac imaging parameters in risk stratification of patients without ventricular arrhythmia is unclear. We followed consecutive AC probands and mutation-positive family members with no documented ventricular arrhythmia from time of diagnosis to first event. We assessed clinical, electrocardiographic, and cardiac imaging parameters according to Task Force Criteria of 2010 in addition to left ventricular (LV) and strain parameters. High-intensity exercise was defined as >6 metabolic equivalents. We included 117 patients (29% probands, 50% female, age 40 ± 17 years). During 4.2 (interquartile range [IQR]: 2.4 to 7.4) years of follow-up, 18 (15%) patients experienced life-threatening ventricular arrhythmias. The 1-, 2-, and 5-year incidence was 6%, 9%, and 22%, respectively. History of high-intensity exercise, T-wave inversions ≥V3, and greater LV mechanical dispersion were the strongest risk markers (adjusted hazard ratio [HR]: 4.7 [95% confidence interval (CI): 1.2 to 17.5]; p = 0....Continue Reading
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