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Electromyography in near-total laryngectomy
G R Arunodaya1, A M Shenoy, S Premalata
1Department of Neurology, National Institute of Mental Health and Neurosciences, Bangalore, India.
Archives of Otolaryngology--Head & Neck Surgery
|August 26, 1998
Summary
Needle electromyography shows that the speech shunt muscle in patients after near-total laryngectomy often retains viable muscle and innervation. This dynamic muscle function is linked to speech production, but its full clinical utility requires further study.
Area of Science:
- Laryngology
- Speech Pathology
- Neuromuscular Electrophysiology
Background:
- Near-total laryngectomy can impact speech function due to alterations in laryngeal anatomy.
- The speech shunt muscle's role in voice production and aspiration prevention after this procedure is not fully understood.
Purpose of the Study:
- To evaluate the dynamics of the speech shunt muscle in patients following near-total laryngectomy using needle electromyography.
- To correlate the ability to activate the shunt muscle with actual speech production outcomes.
Main Methods:
- A prospective study involving 14 patients who underwent near-total laryngectomy at two academic tertiary care centers.
- Percutaneous needle electromyography was used to assess the shunt muscle's viability and innervation.
- Speech ability and the capacity to voluntarily activate the shunt muscle were recorded.
Main Results:
- Electromyography revealed viable shunt muscle with preserved innervation in 64% of patients.
- Nine out of 14 patients demonstrated the ability to activate the shunt muscle through phonation, swallowing, or deep breathing.
- A significant portion of patients with good speech ability showed motor unit recruitment during attempted phonation.
Conclusions:
- The speech shunt muscle in patients after near-total laryngectomy exhibits viable muscle tissue and retained innervation, indicating a dynamic capacity.
- While electromyography confirms muscle viability, further research is needed to establish the clinical significance of shunt muscle activation for speech enhancement and aspiration prevention.