title: Home course in electrocardiography. Lesson 3. Axis and axis deviation.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D006332:Cardiomegaly / Q000503:physiopathology; D004562:Electrocardiography / Q000379:methods; D006321:Heart / Q000033:anatomy & histology; D006801:Humans