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Neurogenic dysphagia: stroke, Parkinson's disease, ALS, myasthenia and dementia
Each neurological disease affects swallowing in its own pattern — brainstem stroke hits the pharyngeal phase and UES opening, Parkinson's causes slowness and silent aspiration, ALS worsens steadily, myasthenia worsens during the meal, and advanced dementia mainly affects the oral phase.
Why it matters in the exam
Questions describe a disease and ask for the expected swallowing pattern, or describe a pattern and ask for the disease. You need to link the site of damage to the phase affected: cortical damage affects the oral phase and swallow onset more, while brainstem damage, especially in the lateral medulla (Wallenberg), severely affects the pharyngeal phase.
Management questions also come up: when to consider tube feeding, what fatigue that worsens over the meal means, and why in advanced dementia the recommendation is careful hand feeding rather than a feeding tube. Another recurring point is that in Parkinson's disease aspiration is often silent, so an instrumental study is needed even when there is no cough.
Key points
- The site of damage decides the phase: cortex — oral phase and onset; brainstem — pharynx and UES.
- Wallenberg: severe pharyngeal dysphagia with poor UES opening.
- Parkinson's: slowness, tongue pumping and silent aspiration.
- Myasthenia: worsening during the meal; ALS: progressive decline and early tube planning.
- Advanced dementia: careful hand feeding, not a routine feeding tube.
Summary table
| Disease | Typical swallowing pattern | Exam point |
|---|---|---|
| Cortical (hemispheric) stroke | Oral-phase difficulty, delayed onset of the pharyngeal phase, sometimes sensory and attention problems | Most patients improve over the first weeks; screen before anything by mouth |
| Brainstem stroke (Wallenberg) | One-sided pharyngeal weakness, poor UES opening, heavy pyriform residue and aspiration | Severe, long-lasting dysphagia; turning the head to the affected side helps |
| Parkinson's disease | Repetitive tongue pumping before bolus transfer, slowness, delayed swallow onset, residue, silent aspiration | Aspiration is often silent; timing medication before meals helps |
| ALS | Progressive weakness with flaccid and spastic components, weight loss | Plan a feeding tube early, while breathing is still adequate |
| Myasthenia gravis | Swallowing and chewing worsen during the meal, nasal voice, ptosis | Fatigue that worsens with use is the clue |
| Advanced dementia | Holding food in the mouth, swallowing apraxia, inattention to food | Careful hand feeding is preferred over a feeding tube |
A free exam question
A 78-year-old man with progressing dementia coughs and has a wet voice when eating solid food, and laryngeal elevation is not always seen when he swallows. When the clinician tells him to swallow, laryngeal elevation is seen and there is no aspiration. He has a full-time caregiver. What should we recommend?
- A. Practise pressing the tongue to the palate
- B. Switch to puree food only
- C. Remind him to swallow
- D. Switch to thickened liquids
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Sources
- ASHA Practice Portal, 2024 — Adult Dysphagia
- Groher & Crary, Dysphagia: Clinical Management in Adults and Children, 3rd edition (2021) — Neurological disorders and dysphagia
- American Geriatrics Society position statement, 2014 — Feeding tubes in advanced dementia
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-02. The text may contain errors; when in doubt, check the source.