Background: arrhythmia" refers to any change from the normal sequence of electrical impulses. Cardiac arrhythmias have been classified into tachycardia and bradycardia. Pediatric arrhythmias account for approximately 55 per 100,000 patients evaluated in pediatric emergency departments. Sinus tachycardia is by far the most commonly reported arrhythmia, followed by supraventricular tachycardia (SVT) which represents about 13%, and bradycardia accounting for about 6% of all cases

Objective: To characterize patients attending pediatric arrhythmia outpatient clinic as regards the presence of cardiac rhythm abnormalities, the pattern of cardiac rhythm abnormalities and the impact of diagnosis and treatment on the patient morbidity.
Methods: This prospective observational study was conducted on 500 pediatric patients from October 2016 to September 2017 in the Pediatric arrhythmia outpatient Clinics of the Pediatric Department. All patients in this study were subjected to complete clinical history including the cause of the referral, complete clinical examinations and twelve leads ECG. The following investigations were requested when indicated and its results were included in the study: Serum electrolyte, Echocardiography, Holter cardiac rhythm monitoring and Electrophysiological studies (EPS), and finally data was analyzed by SPSS software.