A PUBMED search of electrical stimulation and dysphagia yielded 77 articles.
65/77 were chosen for review based on the inclusion criteria of the use of surface electrodes on the exterior laryngeal muscles of humans.
Out of the 65 there was 1 survey, 5 case studies, 4 retrospective studies , 42 prospective studies and 13 meta-analysis or literature reviews.
The results were:
45/65 showed a positive effect
6/65 had a negative or no effect (Incidentally mostly authored by the same group)
14/65 had inconclusive or mixed results
The number of research subjects ranged from 1-120 with a mean of 33
The etiologies represented were as follows:
1- Opercular syndrome
1- Wilson’s disease
2- Multiple Sclerosis
3- Brain injury
3- Parkinson’s Disease
5- Head and Neck Cancer
Of the 65 studies reviewed one was especially impressive:
2014 Article (published in German)
Neuromuscular electric stimulation therapy in otorhinolaryngology, Miller, Kuhn, Jungheim, Schwemmle, & Ptok.
Identified 180 studies for effects of NMES on facial and laryngeal paresis, dysphonia and dysphagia.
Their conclusion: “Evidence collected to date is encouraging; particularly for the treatment of certain forms of dysphagia and laryngeal paresis”