FESSH prep Compressive neuropathies ulnar neuropathy — electrodiagnostic evaluation
Electrodiagnostic findings in ulnar neuropathy at the elbow
Regarding the electrodiagnostic evaluation of ulnar neuropathy at the elbow, which of the following statements are true?
1.Focal slowing of motor conduction velocity across the elbow is the principal electrodiagnostic feature of early demyelinating ulnar neuropathy at the elbow.
2.Reduction of compound muscle action potential (CMAP) amplitude reflects axonal loss and indicates more advanced ulnar neuropathy.
3.Standard nerve conduction studies, performed in a fixed elbow position, may yield false-negative results in patients with intermittent or position-dependent ulnar nerve compression.
4.Needle electromyography detects denervation potentials — fibrillations and positive sharp waves — in ulnar-innervated muscles, supporting axonal involvement.
5.Short-segment (inching) conduction studies localise the site of ulnar nerve compression at the elbow more precisely than standard 10-cm across-elbow studies.
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