Amyotrophic Lateral Sclerosis Diagnosis and Characteristics

Classification and Epidemiology

• Amyotrophic lateral sclerosis (ALS) is characterized by degeneration of both upper and lower motor neurons in the brain and spinal cord along the corticospinal tracts 1
• ALS is the most common motor neuron disease, representing approximately 85% of all motor neuron disease cases 1
• The majority of ALS cases (85-90%) are sporadic, with an annual incidence of 1-2 per 100,000 people 1

Clinical Features and Prognosis

• Classical ALS presents with mixed upper and lower motor neuron signs, with degeneration affecting both motor neuron populations 2
• Bulbar-onset ALS is characterized by initial symptoms such as dysarthria and dysphagia in approximately 80% of patients 2, 3
• Mean survival of typical ALS patients is 3-5 years after symptom onset, with only 5-10% living longer than 10 years 1

Management

• Management of all forms requires a multidisciplinary approach with supportive and palliative care 4