Describe the temporal sequence of electrophysiologic abnormalities seen in a radiculopathy

Table 17-2.

Table 17-2. Temporal sequence of electrophysiologic abnormalities seen in a radiculopathy

DAYS AFTER ONSET

ELECTROPHYSIOLOGIC ABNORMALITIES

0+

Reduced number of motor unit potentials Reduced recruitment interval Increased firing rates of motor potentials Fasciculations may appear H-reflex latency prolonged Reduced number of F waves

4+

Compound motor action potentials amplitude is reduced

7+

Positive sharp waves appear in paraspsinal muscles

12 +

Positive sharp waves appear in proximal limb muscles Fibrillations in paraspinal muscles

15+

Positive sharp waves appear in distal limb muscles Fibrillations occur in proximal limb

18+

Fibrillations potentials seen in most affected muscles

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