Sino-atrial heart-block.
D000367:Age Factors; D002675:Child, Preschool; D004071:Digitalis Glycosides / Q000506:poisoning*; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology*; D006801:Humans; D008297:Male
D004071:Digitalis Glycosides