Effect of a direct current field on axons after experimental spinal cord injury.
There is evidence that direct current (DC) stimulation promotes neurologic recovery in spinal cord injury. The authors conducted a morphometric analysis of axons at the site of spinal cord injury in adult rats treated with a DC field. Ten rats received a 17-g and 15 rats a 53-g clip compression injury and were treated with either a sham (control) or a functioning DC stimulator for 8 weeks. Five normal rats were also assessed. There was a significant relation (p less than 0.0001) between the severity of injury and the number of axons at the injury site. After the 17-g injury, there was no significant difference in the number of axons between control and treated rats. However, after the 53-g injury, there were significantly (p less than 0.05) more axons in treated than control rats. Both degrees of injury caused preferential destruction of large-calibre axons. Subsequent analysis showed that the axon diameter of treated rats with 17-g or 53-g injury was significantly greater (p less than 0.05) than that of control rats with 17-g or 53-g injury. These data, for the first time, show that the application of a DC field increases the number and calibre of axons at the site of a spinal cord injury and enhances the survival or regrowth of axons following spinal cord injury in the rat.
Fehlings
M G
MG
Division of Neurosurgery, Toronto Western Hospital, University of Toronto, Ont.
Wong
T H
TH
Tator
C H
CH
Tymianski
M
M
D000818:Animals; D001369:Axons / Q000502:physiology / Q000648:ultrastructure*; D002452:Cell Count; D004599:Electric Stimulation Therapy; D011184:Postoperative Period; D011897:Random Allocation; D051381:Rats; D013116:Spinal Cord / Q000473:pathology / Q000503:physiopathology; D013119:Spinal Cord Injuries / Q000628:therapy*