[The variation of the P-R interval; its frequency and significance in diagnosis of auricular disorders].
D018376:Cardiovascular Abnormalities; D002319:Cardiovascular System; D004562:Electrocardiography; D006331:Heart Diseases; D006801:Humans
CARDIOVASCULAR DEFECTS, CONGENITAL; ELECTROCARDIOGRAPHY; HEART DISEASE
Lo slivellamento del tratto P.R.; sua frequenza e significato nella valutazione del danno atriale.