Bulbar-Onset ALS: Symptoms, Diagnosis, and Supportive Care

Bulbar-onset ALS (also called progressive bulbar palsy) presents with degeneration of lower motor neurons in the brainstem, affecting muscles of speech, swallowing, and facial expression. It accounts for ~25–30% of ALS cases.

Core Clinical Features

• Dysarthria: Slurred, nasal, or strained speech; reduced intelligibility.
• Dysphagia: Difficulty chewing, initiating swallow, coughing/choking on liquids/solids; risk of aspiration pneumonia.
• Facial and Tongue Weakness: Reduced facial expression, tongue fasciculations, atrophy, deviation.
• Emotional Lability (Pseudobulbar Affect): Involuntary laughing/crying disproportionate to context.
• Excessive Salivation (Sialorrhea): Due to impaired swallowing, not overproduction.

Diagnostic Evaluation

• Clinical history and neurological exam (upper + lower motor neuron signs in bulbar, limb, respiratory regions).
• Electromyography (EMG) with nerve conduction studies: active denervation (fibrillations, positive sharp waves) and chronic reinnervation in ≥3 regions (bulbar, cervical, thoracic, lumbar).
• MRI brain/brainstem: excludes stroke, tumor, MS, myasthenia gravis.
• Blood/CSF: excludes mimics (B12 deficiency, Lyme, HIV, paraneoplastic, Kennedy disease).
• Genetic testing: C9orf72, SOD1, FUS, TARDBP if family history or early onset.

Multidisciplinary Management

• Riluzole / Edaravone: Modestly slow functional decline.
• Speech-Language Pathology: Communication strategies, voice banking, AAC devices.
• Nutrition: Diet modification, feeding tube (PEG) when oral intake unsafe/insufficient.
• Respiratory: NIV (BiPAP) for hypercapnia; cough assist.
• Sialorrhea: Anticholinergics, botulinum toxin, radiation.
• Psychosocial: Palliative care, advance directives, caregiver support.

Early referral to an ALS multidisciplinary clinic improves quality of life and survival.