Patient teaching is considered successful regarding myasthenia gravis when the patient identifies its cause as being:
a. viral infection of skeletal muscle.
b. atrophy of motor neurons in the spinal cord.
c. demyelination of skeletal motor neurons.
d. autoimmune injury at the neuromuscular junction.
ANS: D
Myasthenia gravis is a disorder resulting from autoimmune injury at the neuromuscular junction, not from a viral infection. It is not due to motor neuron atrophy, but a lack of acetylcholine. Mul-tiple sclerosis (MS) is due to demyelination of skeletal motor neurons.
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