Nerve conduction studies (NCS)

Evidence-based neurology checklist on nerve conduction studies (ncs): Test indices F waves: these assess conduction across the whole motor nerve F reflex: this assesses both motor and sensory functions Conduction block (CB): this is assessed with compound muscle action potential (CMAP) Temporal…

Test indices

  • F waves: these assess conduction across the whole motor nerve
  • F reflex: this assesses both motor and sensory functions
  • Conduction block (CB): this is assessed with compound muscle action potential (CMAP)
  • Temporal dispersion: this is CB with increased duration
  • Distal motor latency (DML): this is significantly prolonged with anti-MAG neuropathies

Features of axonal neuropathy

Features of demyelinating neuropathy

Sural sparing: causes

References

  1. Alport AR, Sander HW. Clinical approach to peripheral neuropathy: anatomic localization and diagnostic testing. Continuum (Minneap Minn) 2012; 18:13-38.
  2. Mallik A, Weir AI. Nerve conduction studies: essentials and pitfalls in practice. JNNP 2005; 76(Suppl II):ii23-ii31.

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