title: Forms and features of exit heart block.
mesh_terms: D005117:Cardiac Complexes, Premature / Q000175:diagnosis; D004071:Digitalis Glycosides / Q000506:poisoning; D004562:Electrocardiography; D006325:Heart Atria; D006327:Heart Block / Q000139:chemically induced / Q000175:diagnosis* / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology; D006352:Heart Ventricles; D006801:Humans; D012849:Sinoatrial Node / Q000503:physiopathology
chemical_list: D004071:Digitalis Glycosides