Behavior of the H-reflex in humans following mechanical perturbation or injury to rostral spinal cord

Autor: A. Arturo Leis, W.C. Paske, H.L. Harkey, H.H. Zhou, M. Mehta
Rok vydání: 1996
Předmět:
Zdroj: Muscle & Nerve. 19:1373-1382
ISSN: 1097-4598
0148-639X
DOI: 10.1002/(sici)1097-4598(199611)19:11<1373::aid-mus1>3.0.co;2-9
Popis: In humans H-reflexes are suppressed during early spinal shock. In animals rostral cord injury results in loss of segmental reflexes within seconds. If H-reflexes persist under general anesthesia, can they be used to monitor the integrity of the rostral cord? In part I of this study, we recorded H-reflexes intraoperatively in 25 patients to elucidate general anesthesia effect. In 23 subjects, H-reflexes were consistently elicited, and within +/- 13% of the normalized group mean amplitude. In part II, we recorded H-reflexes in 31 patients during spinal cord surgery to elucidate H-reflex behavior immediately following rostral spinal cord injury. In 6, abrupt suppression of the H-reflex coincided with cord injury. In 4 of 6, suppression was transient and less than 50% of baseline; none of these patients developed neurological deficits. In 2, suppression exceeded 90% and persisted throughout surgery; both patients developed profound deficits. We conclude that (1) the H-reflex can be consistently elicited under general anesthesia in most patients, (2) rostral cord injury rapidly suppresses the H-reflex, and (3) the degree and duration of H-reflex suppression reflects the severity of the injury.
Databáze: OpenAIRE
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