title: An appraisal of initial QRS forces in left anterior fascicular block.
mesh_terms: D000328:Adult; D000818:Animals; D002036:Bundle of His / Q000033:anatomy & histology / Q000473:pathology / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000175:diagnosis*; D004285:Dogs; D004562:Electrocardiography / Q000379:methods*; D006801:Humans; D014672:Vectorcardiography / Q000379:methods