title: Case studies: heart block during cardiac catheterization--demonstration by His bundle recording and documentation of concealed retrograde A-V nodal conduction.
mesh_terms: D000368:Aged; D000787:Angina Pectoris / Q000000981:diagnostic imaging; D000790:Angiocardiography; D002037:Bundle-Branch Block / Q000150:complications; D006328:Cardiac Catheterization / Q000009:adverse effects*; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000209:etiology*; D006329:Heart Conduction System / Q000293:injuries* / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged