title: Wendkebach phenomenon occurring in secondary syphilis.
mesh_terms: D000293:Adolescent; D000328:Adult; D006332:Cardiomegaly / Q000209:etiology; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010401:Penicillin G Benzathine / Q000627:therapeutic use; D013588:Syphilis Serodiagnosis; D013589:Syphilis, Cardiovascular / Q000150:complications / Q000175:diagnosis / Q000188:drug therapy
chemical_list: D010401:Penicillin G Benzathine