How do normal EMG findings compare with the findings seen in a myopathic disorder

How do normal EMG findings compare with the findings seen in a myopathic disorder?

The weaker a patient with myopathy is, the more likely the needle EMG findings will be abnormal. In patients with very mild weakness or those with steroid myopathy, the needle EMG recording may appear normal.

Electromyography Findings for Normal Muscle and Myopathic Disorders

Electromyography FindingsNormal MuscleMyopathy
Spontaneous activityNoneVariable fibrillations, positive sharp waves
Motor unit action potential morphologyNormalSmall amplitude, short duration, increased polyphasia
RecruitmentNormalEarly recruitment
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