Summary
Background
No studies exist dealing with the outcome of dysphagic patients with posterior fossa (IV. ventricle) tumours (PFT) or cerebellar hemorrhage (CH), and the outcome of patients with Wallenberg’s syndrome (WS) after functional swallowing therapy (FST) has so far not been studied in detail.
Patients and methods
208 patients with neurogenic dysphagia (ND) who were consecutively admitted for functional swallowing therapy (FST) over a 3 year period to our hospital were examined clinically, by use of a videofluoroscopic swallowing study (VFSS) and/or fibreoptic evaluation of swallowing (FEES). The most frequent etiology was stroke (48%), followed by CNS tumours (13%). In the present study we defined three groups. Group 1 comprised 8 patients with PFT or CH. Group 2 consisted of 27 patients with WS, which was the leading cause among patients with non-hemispheric stroke. Since in WS a vagal nerve paresis due to affection of the Nucleus ambiguus occurs, 8 patients with Avellis’ syndrome or unilateral paresis of the vagal nerve served as controls and were defined as group 3.
Findings
In the three groups, functional feeding status showed significant improvement after FST comprising methods of restitution, compensation and adaptation, each of which were applied in more than 80% of patients. Outcome was, however, significantly worse in group 1 as compared to group 2 and in group 2 as compared to group 3. Dysfunction of the upper esophageal sphincter and reflex triggering were significantly more severely disturbed in groups 1 and 2 as compared to group 3. Group 1 showed significantly more severe disturbances of the oral phase as compared to groups 2 and 3. After FST, more than 50% (5/8) of group 1 and 30% (8/27) of WS patients (group 2) were dependent on tube feeding, whereas all patients of group 3 were full-oral feeders.
Interpretation
This is the first study dealing with the outcome of dysphagic patients with PFT or CH. Based on our results it can be assumed that in these patients pressure is exerted on both dorsomedial central pattern generators (DMCPGs) for swallowing in a posterior-anterior direction. Due to the importance of the DMCPGs for swallowing, bilateral (and often MRI-invisible) lesions seem to be very harmful. For a better understanding of the pathomechanism responsible for ND in patients with PFT or CH, modern imaging methods such as proton magnetic resonance spectroscopy should be used for studying metabolic changes in the dorsal medulla in the future. Since the outcome of patients with WS with regard to dependence of tube feeding was not associated with the site or size of the lesion, it may — due to the individual asymmetry of the swallowing-dominant forebrain hemisphere — depend on the side of the medullary infarction.
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References
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Prosiegel, M., Höling, R., Heintze, M., Wagner-Sonntag, E., Wiseman, K. (2005). Swallowing therapy — a prospective study on patients with neurogenic dysphagia due to unilateral paresis of the vagal nerve, Avellis’ syndrome, Wallenberg’s syndrome, posterior fossa tumours and cerebellar hemorrhage. In: von Wild, K.R.H. (eds) Re-Engineering of the Damaged Brain and Spinal Cord. Acta Neurochirurgica Supplementum, vol 93. Springer, Vienna. https://doi.org/10.1007/3-211-27577-0_4
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DOI: https://doi.org/10.1007/3-211-27577-0_4
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