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Chapter 8: Principles of Electrophysiologic Evaluation and Testing

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Both myasthenia gravis and Lambert–Eaton are examples of postsynaptic dysfunction.

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a. True

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b. False

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b. False

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A fibrillation potential is defined as the “spontaneous firing of a motor neuron and all of the muscle fibers innervated by that motor neuron.”

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a. True

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b. False

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b. False

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An H-reflex is physiologically equivalent to a MSR. Following stimulation, an AP is carried proximally via afferent axons to the spinal cord, where the combined potential enters the dorsal horn of the spinal cord, passes through at least one synapse, and then is carried via efferent axons to the appropriate distal muscle.

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a. True

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b. False

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a. True

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Which of the following best represents the role of a patient history and physical examination, in relation to electrophysiologic testing?

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a. Electrophysiologic testing stands by itself as an objective assessment of nerve function (no history or physical examination is needed).

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b. A history can assist with items such as the potential for inherited traits, but there is no compelling need to perform a physical examination.

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c. If laboratory tests and preceding assessment measures such as MRIs have been obtained, it is redundant to take the time to perform a history and/or physical examination.

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d. Electrophysiologic testing is based on a sound history and physical examination.

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d. Electrophysiologic testing is based on a sound history and physical examination.

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With a compression of the superficial branch of the ulnar nerve at Guyon's canal, which of the following would be expected?

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a. prolonged distal latency to D5

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b. faster conduction velocity of the motor fibers

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c. increased amplitude of the ulnar SNAP

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d. decreased recruitment of the ADM and first DI

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a. prolonged distal latency to D5

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What is the typical minimum NCV speed of a normal mixed nerve (motor and sensory) in the upper extremity?

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a. 40 m/s

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