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Nerve compound action current (NCAC) measurements and morphometric analysis in the proximal segment after nerve transection and repair in a rabbit model
Walbeehm E. T, Dudok van Heel E. B, Kuypers P. D, Terenghi G, Hovius S. E
J Peripher Nerv Syst. 2003;8, 2:108-15.
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Abstract
In the evaluation of nerve regeneration using magneto-neurography (MNG), the proximal segment showed a reproducible decrease in peak-peak amplitude of the nerve compound action current's (NCAC) of 60%. To explain these changes, morphometry of myelinated axons in the proximal segment is compared to the MNG signals. A standardised nerve transection and reconstruction was performed in rabbits. NCACs were measured approximately 5 cm proximal to the lesion from operated and control nerves after 12 weeks. Histological samples were taken from the same area of the nerve where the NCACs were obtained. Results showed a decrease of the peak-peak amplitude of the NCAC of 57% compared to the control. Conduction velocity decreased 15% (not significant). Morphometry elicited a decrease in larger (10-15 microm) axons (284 +/- 134 vs 82 +/- 55) and an increase in smaller (2-5 microm) axons (1445 +/- 360 vs 1921 +/- 393). A strong correlation existed between the decrease in amplitude and the decrease in larger axons (0.85). Peak-peak amplitude varies approximately with the square of the diameter axon. Therefore, because peak-peak amplitude is mainly dependent on the larger-diameter axons, the decrease in peak-peak amplitude of the NCACs may be explained by a decrease in numbers of 10-15-microm axons.
Keyword(s)
Action Potentials/physiology; Animal; Axons/classification/physiology; Cell Size/physiology; Comparative Study; Electrophysiology; Magnetoencephalography/instrumentation/methods; Nerve Regeneration/*physiology; Neural Conduction/*physiology; Peripheral Nerves/*physiology; Rabbits; Reaction Time/physiology; Reflex/physiology; Research Design
Bibliographic metadata
- 226813511085-9489Journal Article