Abstract
Bilateral vocal fold paresis (BVFP) is a rare condition, potentially life-threatening when the associated airway obstruction symptoms are severe. The most frequent etiology is iatrogenic nerve lesion during thyroid gland surgery. Surgical glottic enlargement, even though associated with various degrees of voice impairment, still represents the golden therapeutic standard.
This chapter focuses on neurostimulation as potential alternative treatment strategy. Decades of clinical experience supported by the laryngeal electromyography (EMG) results have provided sound evidence that the majority of peripheral laryngeal nerve lesions do not cause paralysis with atrophy of the intrinsic laryngeal muscles. On the contrary they are generally associated with misdirected, mostly synkinetic reinnervation.
Basic research, including long-term results from animal trials, has shown that a synkinetically reinnervated larynx is the prerequisite for neuromuscular electrical stimulation (NMES). In general, the stimulation of terminal nerve branches near the target muscle can re-establish its original function. In the specific case of BFVP, stimulation of the posterior cricoarytenoid muscle (PCA) restores vocal fold abduction.
The concept of laryngeal pacing (LP) was introduced in the 1970s of the last century. The first proof of principle laryngeal pacing study in human evaluated the use of an implantable pulse generator (IPG) primarily designed for pain therapy. However, due to various technical problems, such as electrode corrosion, this early clinical research was referred back to animal trials after 2003.
On account of the technological advancements of the last decade, a new type of medical device for laryngeal pacing has been recently developed. With this device, electrode placement is done in a minimally invasive procedure, thus preventing the occurrence of the technical problems observed in earlier attempts. The first feasibility study in human with this new LP system has been recently published and showed promising results.
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Mueller, A.H. (2018). Laryngeal Pacing. In: Sittel, C., Guntinas-Lichius, O. (eds) Neurolaryngology. Springer, Cham. https://doi.org/10.1007/978-3-319-61724-4_14
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DOI: https://doi.org/10.1007/978-3-319-61724-4_14
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