Ann Clin Neurophysiol.  2018 Jan;20(1):49-52. 10.14253/acn.2018.20.1.49.

A case of acute motor sensory axonal neuropathy presenting reversible conduction block

• Lee D
• Kim HC
• Park KM
• Park J
• Ha SY
• Kim SE
• Lee BI
• Kim JK
• Yoon B
• Shin KJ

• KMID: 2403223
• DOI: http://doi.org/10.14253/acn.2018.20.1.49

Abstract

Reversible conduction block (RCB) was rare in patients with acute motor sensory axonal neuropathy (AMSAN). A-46-year-old man presented with paresthesia, weakness, diplopia, and dysarthria. Nerve conduction study (NCS) exhibited axonal changes with conduction block in motor and sensory nerves. His symptoms were rapidly progressed and recovered. Conduction block was disappeared in the follow-up NCS performed after 2 weeks. The AMSAN case with RCB showed rapid progress and rapid recovery of clinical symptoms as acute motor axonal neuropathy patients with RCB.

Keyword

Guillain-Barre Syndrome; Nerve conduction; Muscle weakness

MeSH Terms

Axons*
Diplopia
Dysarthria
Follow-Up Studies
Guillain-Barre Syndrome
Humans
Muscle Weakness
Neural Conduction
Paresthesia

Figure

• 

  Fig. 1. Nerve conduction studies in the present case. (A) Initial nerve conduction study which was performed on the second day of admission exhibited the decreased sensory nerve action potential amplitude and compound motor action potential amplitude of both upper extremities. Conduction block was observed in both ulnar nerves. F-waves of both median, ulnar, and common peroneal nerves and H-reflexes in both calf muscles were not formed. (B) Conduction block in the left ulnar motor nerve was firstly appeared on the second day of admission, began to reverse on the seventeenth day of admission, and disappeared on the thirty-first day of admission. (C) Conduction block in the left common peroneal nerve was firstly appeared on the seventeenth day of admission and disappeared at the thirty-first day of admission.

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