الفهرس 
Role of cardiac Mri in assessment of pediatric patients with rheumatic heart diseases
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Abstract
Cardiac magnetic resonance imaging (CMR) is a rapidly evolving non-invasive accurate diagnostic tool for evaluation of cardiac anatomy, volumes and functions; it allows better comprehension of flow visualization and quantification of blood flow through cardiac structures and blood vessels. Rheumatic heart disease (RHD) is a non-suppurative sequelae occurring two to four weeks after group A. beta hemolytic streptococcal pharyngitis. Acute rheumatic fever may constitute of carditis which is usually a pancarditis, arthritis, chorea, subcutaneous nodules and erythema marginatum, while chronic rheumatic heart disease is essentially a valvular affection which may be recurrent and progressive during rheumatic activities leading to cardiac decompensation. RHD is a major cardiovascular burden on parents, community and health officials especially in developing countries; early and proper diagnosis aids a lot to decrease its morbidity. Since the cardiac affection in RHD is valvular; echocardiography is the golden diagnostic tool to evaluate valvular heart diseases, however myocardial affection in RHD by conventional echocardiography has been controversial, and CMR adds valuable information about myocardial involvement owing to its inherent high soft tissue contrast, it can clearly depict the different items of myocarditis that include edema, hyperemia and fibrosis, besides it plays a crucial role in patient decision making weather surgical valve replacement or medical treatment according to its high accuracy in calculating cardiac volumes and functions as well as flow quantification; in particular regurgitation fraction percentage