الفهرس 
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Abstract
Supraventricular tachycardia (SVT) is a rapid rhythm that involves the atria, atrioventricular (AV) node, or accessory bypass tracts. It is the most common tachycardia seen in infants and children, with an incidence of 1 in 250 to 1000, occurring most commonly before 1 year of age. The overall incidence of SVT in children was (13%). persistent supraventricular tachycardia can trigger major cardiac remodeling and alter cardiac structure and function. Echocardiography has become the primary imaging tool in the diagnosis and assessment of congenital and acquired heart disease in infants, children, and adolescents. Transthoracic echocardiography is an inexpensive and easily applicable technique that provides us with accurate diagnosis of myocardial, valvular, and congenital heart disorders associated with arrhythmias. Troponins are cardiac regulatory proteins that are found in the cytoplasm of cardiac myocytes. The cardiac troponins (cTns) are a complex of three protein subunits, troponin C, troponin I, and troponin T are the subunits that are identified in laboratory testing looking for cardiac muscle injury. cTnI has been shown to be exclusive to cardiac muscle. Troponin measurements have been used for the diagnosis of myocardial infarction (MI). Elevated levels of cardiac troponins have also been reported in patients with cardiac arrhythmias. Some studies demonstrated cardiac troponin elevations (cardiac troponin T and I) after high-intensity, short- duration and prolonged exercise. Cardiac troponin I (cTnI) elevation is also common in an acute episode of SVT. This study aimed to evaluate the diagnostic and prognostic value of Troponin I in children with supraventricular arrhythmia, and the role of echocardiographic parameters in evaluation of cardiac function of these patients. This study was conducted on 45children in the pediatric age below 16 years. These children were divided into two groups: children with supraventricular arrhythmia (n=25) (cases) group and healthy children (control group) (n=20), one patient was excluded.