Arquivo da tag: electromyography

Electrical activity of the masseter during swallowing after total laryngectomy

Pernambuco, Leandro de Araújo; Silva, Hilton Justino da; Nascimento, Gerlane Karla Bezerra Oliveira; Silva, Elthon Gomes Fernandes da; Balata, Patrícia Maria Mendes; Santos, Veridiana da Silva; Leão, Jair Carneir

Braz J Otorhinolaryngol; 77(5): 645-650, Sept.-Oct. 2011. tab.


Total laryngectomy is a surgical procedure that can change swallowing biomechanics, including muscle activity of the masseter; this muscle stabilizes the mandible.

AIM: To characterize the electrical activity of the masseter muscle during swallowing after total laryngectomy. Series study.

MATERIAL AND METHODS: An electromyographic evaluation of swallowing was carried out; three different volumes of water (14.5ml, 20ml and 100ml) were swallowed, and there was a rest condition. The electromyographic signal was normalized by Maximum Resisted Voluntary Activity – considered as 100 percent of electrical activity of muscles. All other values were calculated as a percentage of this parameter.

RESULTS: There is moderate electrical activity of the masseter during swallowing with higher averages on the left. There was no difference between swallowing 14.5ml or 20ml. Natural swallowing of 100ml had the lowest average. Electromyographic signals were recorded at rest on both sides, indicating the existence of electric activity in this situation.

CONCLUSION: Patients submitted to total laryngectomy present electrical activity of the masseter muscles during swallowing and at rest. This activity is influenced by the volume of swallowed liquid, and showed significant differences among the tasks.


Experience of using electromyography of genioglossus in the investigation of paediatric dysphagia


Vijayakumar K, Rockett J, Ryan M, Harris R, Pitt M, Devile C.

Dev Med Child Neurol. 2012 Oct 25. doi: 10.1111/j.1469-8749.2012.04431.x. [Epub ahead of print]


Aim  The aim of the study was to assess, retrospectively, the utility of genioglossus electromyography (gEMG) in evaluating children with suspected neurogenic feeding and swallowing difficulties. Method  Children who were evaluated using gEMG at a tertiary paediatric neurology dysphagia service were reviewed. Data were analysed by the presence/absence of neurogenic changes on gEMG and the method of feeding at their most recent follow-up. Results  The study group comprised 59 individuals (36 males, 23 females; median age 20mo; range 1mo-15y). The study cohort included individuals with heterogeneous neurological phenotypes (n=40), craniofacial syndrome (n=10), and congenital bulbar palsy (n=9). gEMG identified 35 out of 59 (60%) with neurogenic changes. At follow-up, 24 individuals were on oral feeds and 35 were on alternative methods of feeding (nasogastric /gastrostomy). Eight out of 24 children on oral feeds showed neurogenic changes compared with 27 out of 35 on alternative feeds. χ(2) analysis of feeding method at follow-up and the presence or absence of neurogenic change on EMG was highly significant (p≤0.002). When confounding factors for alternative feeds were accounted for on univariate analysis, the neurogenic changes, severe gastro-oesophageal reflux disease, and respiratory comorbidities were statistically significant in predicting the alternative feeding, whereas growth failure and behavioural difficulties were not significant confounders. Moreover, multiple logistic regression analysis revealed that the neurogenic changes were independently predictive of an alternative method of feeding after adjusting for other confounders with an odds ratio of 29.6 (95% confidence interval 3.97-220; p<0.007). Conclusion  gEMG is a valuable complementary tool in the evaluation of children with neurogenic dysphagia as the degree of severity is independently correlated with long-term feeding outcomes.