Reduced Laryngeal Sensitivity and its Association with Dysphagia and
Cough in Children with Neurological Impairment
Abstract
Background Silent aspirations are frequent in children with neurological
impairment. They dramatically increase the risk for acute and chronic
respiratory insufficiencies leading to high morbidity and mortality.
Laryngeal sensitivity deficits have been linked to aspirations in adults
and are a suspected cause for dysphagia in children. In a similar
neurological circuit as swallowing, laryngeal receptors trigger coughing
as a protective airway reflex. The aim of this study was to examine the
association between reduced laryngeal sensitivity, aspiration and
coughing in neurologically impaired children. Design and Methods In a
retrospective study, 110 children with suspected dysphagia who received
a clinical evaluation of swallowing and a flexible endoscopic evaluation
of swallowing (FEES) between 2013 and 2019 in the children’s university
clinic Düsseldorf were analyzed. Laryngeal sensitivity was tested by the
endoscopic touch method. Fifty-four patients (49.1%) had neurological
impairments, 56 patients (5.9%) had no or other comorbidities and
served as a control cohort. Associations were computed using χ2-test.
Results Children with neurological impairment suffered from laryngeal
sensory deficit significantly more often and seemed to cough less
frequently than children with no or other comorbidities. Reduced
laryngeal sensitivity could not be correlated to less coughing. Coughing
acted as a predictor of aspiration only in the neurologically impaired
group of children with reduced laryngeal sensitivity. Conclusion Reduced
laryngeal sensitivity is a potential cause of silent aspirations in
children with neurological impairment. However, reduced laryngeal
sensitivity did not lead to significantly less coughing which might be
due to a lack of discrimination between different levels of sensitivity
deficits by the endoscopic touch.