title: Coprevalence of tremor with spasmodic dysphonia: a case-control study.
abstract: OBJECTIVE
  The aim of this study was to define the coprevalence of tremor with spasmodic dysphonia (SD).
  
  
  METHODS
  A single-institution, prospective, case-control study was performed from May 2010 to July 2010.
  
  
  METHODS
  Consecutive patients with SD (cases) and other voice disorders (controls) were enrolled prospectively. Each participant underwent a voice evaluation and an evaluation for tremor.
  
  
  RESULTS
  There were 146 voice disorder controls and 128 patients with SD enrolled. Of patients with SD 26% had vocal tremor, 21% had nonvocal tremor. Patients with SD were 2.8 times more likely to have coprevalent tremor than the control group (odds ratio = 2.81; 95% confidence interval, 1.55-5.08), and only 35% of patients with SD had been seen by a neurologist for the evaluation of dystonia and tremor.
  
  
  CONCLUSIONS
  Tremor is highly prevalent in patients with SD. It is important for each patient diagnosed with SD to undergo an evaluation for tremor, and this is especially important in patients diagnosed with vocal tremor.
authors.affiliation: Emory University School of Medicine, Atlanta, Georgia, USA.
authors.forename: Laura J
authors.initials: LJ
authors.lastname: White
authors.forename: Adam M
authors.initials: AM
authors.lastname: Klein
authors.forename: Edie R
authors.initials: ER
authors.lastname: Hapner
authors.forename: John M
authors.initials: JM
authors.lastname: Delgaudio
authors.forename: John J
authors.initials: JJ
authors.lastname: Hanfelt
authors.forename: Hyder A
authors.initials: HA
authors.lastname: Jinnah
authors.forename: Michael M
authors.initials: MM
authors.lastname: Johns
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D055154:Dysphonia / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014202:Tremor / Q000150:complications*