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Motor Neuron Disease and Neuropathies

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If a sensory study shows prolonged latencies but a motor study on the same peripheral nerve is normal, what does this typically indicate?

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A. Mild axonal injury

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B. Mild myelin injury

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C. Moderate axonal injury

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D. Moderate myelin injury

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B. Mild myelin injury

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In a needle EMG study, why is it important to study insertional activity?

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A. To find evidence of axonal injury

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B. To find evidence of myopathy

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C. To study the neuromuscular junction

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D. To study the nociceptors

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A. To find evidence of axonal injury

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What is the difference between H-reflex testing and F-wave testing?

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A. Only F-wave testing requires normal motor neuron and motor axon function

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B. Only H-reflex testing is useful for detecting radiculopathy

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C. Only F-wave testing requires an intact nerve plexus

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D. Only H-reflex testing requires normal sensory axons

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D. Only H-reflex testing requires normal sensory axons

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Death from amyotrophic lateral sclerosis (ALS) from the time of diagnosis occurs on average in:

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A. 6–12 months

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B. 1–3 years

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C. 3–5 years

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D. 5–7 years

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C. 3–5 years

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A variant of sporadic ALS that features spasticity with only slight weakness of the extremities due to dysfunction of the corticospinal tract without lower motor neuron involvement is:

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A. Primary lateral sclerosis

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B. Progressive bulbar palsy

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C. Pseudobulbar palsy

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D. Progressive muscular atrophy

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A. Primary lateral sclerosis

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Which of the following impairments is relatively rare in people with ALS?

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A. Sensory deficits

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B. Dysphagia

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C. Weakness/paralysis of spinal muscles

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D. Fatigue

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A. Sensory deficits

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Questions 7 and 8 refer to the following scenario:

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Mary Thomas is a 40-year-old female with familial ALS. She reports she has always been active prior to her ...

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