title: Significance of isolated H-V interval prolongation in symptomatic patients without documented heart block.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006327:Heart Block / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009026:Mortality; D010138:Pacemaker, Artificial; D011379:Prognosis; D012306:Risk