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September 10, 2013; 81 (11) Resident and Fellow Section

Clinical Reasoning: A 62-year-old man with right wrist drop

Giovanni Cirillo, Vincenzo Todisco, Alessandro Tessitore, Gioacchino Tedeschi
First published September 9, 2013, DOI: https://doi.org/10.1212/WNL.0b013e3182a43b90
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    Figure Nerve conduction study findings of right deep peroneal nerve and repetitive nerve stimulation test findings

    (A) Distal nerve stimulation at ankle from extensor digitorum brevis (EDB) resulted in a normal compound muscle action potential (CMAP); subsequent single proximal stimulus at fibular head showed a significant drop of CMAP amplitude and area, which was still evident at the second single distal stimulus. (B) Postexercise 3-Hz repetitive nerve stimulation (RNS) of the right median to abductor pollicis brevis (R-APB) (B.a) and right facial to nasalis (R-Na) (B.b) muscles showed significant decrement in both muscles. Amp. p-p = amplitude measured at peak to peak; Area p- = area of negative peak; Fib. head = fibular head.

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