Compound muscle action potential duration in critical illness neuromyopathy.

Abstract:

INTRODUCTION:We sought to determine the specificity of compound muscle action potential (CMAP) durations and amplitudes in a large critical illness neuromyopathy (CINM) cohort relative to controls with other neuromuscular conditions. METHODS:Fifty-eight patients with CINM who had been seen over a 17-year period were retrospectively studied. Electrodiagnostic findings of the CINM cohort were compared with patients with axonal peripheral neuropathy and myopathy due to other causes. RESULTS:Mean CMAP durations were prolonged, and mean CMAP amplitudes were severely reduced both proximally and distally in all nerves studied in the CINM cohort relative to the control groups. The specificity of prolonged CMAP durations for CINM approached 100% if they were encountered in more than 1 nerve. DISCUSSION:Prolonged, low-amplitude CMAPs occur more frequently and with greater severity in CINM patients than in neuromuscular controls with myopathy and axonal neuropathy and are highly specific for the diagnosis of CINM. Muscle Nerve 57: 395-400, 2018.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Kramer CL,Boon AJ,Harper CM,Goodman BP

doi

10.1002/mus.25732

subject

Has Abstract

pub_date

2018-03-01 00:00:00

pages

395-400

issue

3

eissn

0148-639X

issn

1097-4598

journal_volume

57

pub_type

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