title: The relation of QRS amplitude to the frontal QRS axis and the heart-electrode distance.
mesh_terms: D000367:Age Factors; D001827:Body Height; D001835:Body Weight; D004562:Electrocardiography; D004566:Electrodes; D006321:Heart / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D006801:Humans; D011859:Radiography