[Cases of pediatric electrocardiography. Atrial extrasystole].
D005117:Cardiac Complexes, Premature / Q000150:complications / Q000175:diagnosis*; D002648:Child; D004562:Electrocardiography; D006801:Humans; D008297:Male; D013610:Tachycardia / Q000209:etiology
Casos de electrocardiografia pediátrica. Extrasístoles atriales.