[Experimental study of spinal cord evoked potentials in cats].
Assessment of function of the spinal cord utilizing spinal cord evoked potentials (SEP) has become a useful diagnostic tool. In the present study, various aspects of characteristics of SEP were analyzed. The basic waveform of conductive SEP consisted of two major components, namely, N1 and N2, whose conduction velocities along the dorsal surface of the cord were 74 m/s and 55 m/s, respectively. Halothane inhalation caused reduction of N2 amplitude, whereas asphyxia caused latency delay of N2. Significant amplitude reduction of N1, N2 (p less than 0.005) and considerable latency delay of N1 were noted in ventral epidural recording. Although there was no relationship between severity of injury and the appearance of positive potentials, N2 tended to be positive-going in heavy injury. Findings of positive potentials showed that N1 originated in the area of ventral gray matter through the ventro-lateral column and N2 through the dorsal column.
D000769:Anesthesia, Inhalation; D000818:Animals; D002415:Cats; D005071:Evoked Potentials; D006221:Halothane; D000860:Hypoxia / Q000503:physiopathology; D013116:Spinal Cord / Q000502:physiology* / Q000503:physiopathology; D013119:Spinal Cord Injuries / Q000503:physiopathology
D006221:Halothane