RETROGRADE ACTIVATION OF ATRIA IN ATRIOVENTRICULAR BLOCK.
D054537:Atrioventricular Block; D002318:Cardiovascular Diseases; D004562:Electrocardiography; D005853:Geriatrics; D006325:Heart Atria; D006327:Heart Block; D006801:Humans
ELECTROCARDIOGRAPHY; GERIATRICS; HEART BLOCK