Instability of auriculoventricular conduction in acute rheumatic fever.  II.  Effect of position on first degree heart block.
D054537:Atrioventricular Block; D006327:Heart Block / Q000209:etiology*; D006339:Heart Rate; D006801:Humans; D012213:Rheumatic Fever
HEART BLOCK/etiology and pathogenesis; RHEUMATIC FEVER