Clinical investigations of adductor spastic dysphonia.

Spastic (spasmodic) dysphonia (SD) may coexist with or reflect certain neurologic or psychogenic illnesses. The present study of four patients with adductor SD (ASD) revealed several consistent clinical findings and characteristics that could be differentiated, while other findings were not distinguishable. Oscillographic and spectral analyses suggested voice tremor as a component of the dysphonia in all ASD patients studied. Clinical neurologic and otolaryngologic findings were nonconfirmatory regarding a disease process or state.