title: [Atrial fibrillation complicating second-degree block].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000150:complications* / Q000175:diagnosis; D005260:Female; D006327:Heart Block / Q000150:complications* / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged