Abstract 14683: Incidence and Predictors of Dangerous Arrhythmias During Pediatric Exercise Tests

Introduction: The incidence of dangerous arrhythmias during pediatric exercise stress tests (EST) and criteria for identifying patients at high risk for this adverse event are poorly characterized. We undertook a retrospective study to quantify the incidence of arrhythmias during EST and to evaluate criteria to identify patients at risk for the most serious arrhythmias. Methods: Retrospective review of ESTs performed 2013-2015. Arrhythmias were categorized into 4 classes: non-sustained, not requiring test termination (1); non-sustained, triggering test termination (2); sustained requiring vagal maneuvers or medication (3); arrhythmias requiring cardioversion/defibrillation and/or CPR (4). Risk factors evaluated included: ICD, cardiomyopathy, severe ventricular dysfunction, complex arrhythmia history, coronary disease with concern for ischemia, pulmonary hypertension, select poorly palliated congenital heart disease (CHD), and concerning symptoms. Negative predictive values (NPV) and confidence intervals (...