[On the electrocardiographic index in the horizontal plane. Preliminary study].
D000328:Adult; D000818:Animals; D004285:Dogs; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D013902:Radiography, Thoracic
Sôbre um índice electrocardiográfico no plano horizontal. Estudo preliminar.