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[The ultimate electromyographic patterns in reinnervated muscle (author's transl)]
EEG-EMG Zeitschrift Fur Elektroenzephalographie, Elektromyographie Und Verwandte Gebiete
|December 1, 1976
Summary
Later stage nerve repair in 59 patients showed increased motor unit amplitude after ulnar or median nerve surgery. Full recovery was not achieved, with reinnervated muscles showing 32-62% of normal evoked potential amplitude.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
- Peripheral Nerve Injury
Context:
- Investigated long-term outcomes in 59 patients following peripheral nerve repair (section and suture or transplantation) of the ulnar or median nerve.
- Focused on electromyographic (EMG) patterns in later stages post-intervention.
Purpose:
- To characterize the electromyographic changes and extent of functional recovery after nerve section and suture or transplantation.
- To correlate EMG findings with the degree of reinnervation and functional outcome.
Summary:
- The most common EMG finding was a marked increase in mean amplitude, attributed to a higher number and concentration of muscle fibers within reconstituted motor units.
- Mean duration and polyphasic potential incidence showed only slight increases, suggesting near-synchronous activation of muscle fibers within motor units.
- Complete functional recovery was not observed in any patient; mean evoked potential amplitudes in reinnervated muscles ranged from 32% (poor reinnervation) to 62% (satisfactory reinnervation) compared to the contralateral normal limb.
Impact:
- Provides insights into the long-term electrophysiological characteristics of repaired peripheral nerves.
- Quantifies the degree of functional deficit remaining after nerve repair procedures.
- Highlights the limitations of current surgical techniques in achieving complete nerve regeneration and functional restoration.