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Diagnostic yield of ambulatory cardiac monitoring in pediatric patients with palpitations

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Background : Palpitations are a frequent reason for referral to pediatric cardiology providers and diagnostic workup includes ambulatory cardiac monitoring. While common practice, the diagnostic yield is unknown in the pediatric population. The objective is to evaluate the diagnostic yield of 24-h Holter and extended ambulatory cardiac monitoring in pediatric patients with palpitations. Methods and Results : All pediatric patients aged 10- 18 years who had ambulatory cardiac monitoring (1-30 days) through the Pocket Electrocardiogram (PocketECGT) system (Medi-Lynx) between January 2016 and July 2020 were included. Patients with an International Classification of Diseases-10 diagnosis code of palpitations (R00.2) during enrollment were evaluated separately. Tachyarrhythmia diagnoses included atrial fibrillation (AF), nonsustained supraventricular tachycardia (nSVT), supraventricular tachycardia (SVT), nonsustained ventricular tachycardia (nVT), and ventricular tachycardia (VT). Age, heart rates, arrhythmia type, and symptomatic transmission data were collected and analyzed. A total of 2388 patients (mean age 11.6 years, 58 F) with the R00.2 code had ambulatory cardiac monitoring ( 28 24-h Holter, 72 extended) performed during the study period and there were 6287 total patients (mean age 13.9 years, 54 F) that underwent ambulatory cardiac monitoring (42 24-h Holter, 58 extended) during that time. Of 2388 patients, 321 (13) were diagnosed with tachyarrhythmia: AF (9), nSVT (192), SVT (59), and nVT (61). In the overall cohort, 764 (12) patients were diagnosed with tachyarrhythmia: AF (22), nSVT (478), SVT (85), nVT (177), and VT (2). Symptomatic transmissions with normal cardiac rhythm were common in the R00.2 ( n = 1697, 71) and overall (n = 3848, 61) groups. No episodes of nSVT, SVT, nVT, or VT were associated with symptomatic transmissions. Conclusion : Ambulatory cardiac monitors are an integral part of the diagnostic workup for pediatric palpitations patients and have demonstrated a high yield of combined positive arrhythmia diagnoses and symptomatic normal transmissions. Further prospective study of this population with the integration of clinical information is warranted.

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