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[A probe into the relationship between spasmodic dysphonia and laryngeal paralysis]
Objective:
To investigate into the relationship between spasmodic dysphonia and laryngeal paralysis.
Methods:
The intrinsic laryngeal muscle potential was recorded with electromyography. Vocal cord movements were observed with a videostroboscope. Laryngeal paralysis was divided into mild, moderate, and severe degrees based on the potentials of intrinsic laryngeal muscles and on the status of vocal cord movements.
Results:
In the past 12 years (from 1983 to 1994) 1300 cases were diagnosed as having mild, moderate, and severe laryngeal paralysis. Among them, there were 5 cases with laryngospasm including 3 mild, 1 moderate, and 1 severe case.
Conclusion:
The findings obtained from careful observation on these 5 cases of spasmodic dysphonia demonstrated that there existed certain relationships between laryngeal paralysis and spasmodic dysphonia. During the course of exacerbation or restoration of paralysis, spasmodic dysphonia might occur.
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