title: A simple, rapid method for the diagnosis of first-degree sinoatrial block in man.
mesh_terms: D001146:Arrhythmia, Sinus / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography; D006801:Humans; D008722:Methods; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node / Q000503:physiopathology*