Autonomic hyperreflexia is a condition which may occur in individuals
with spinal cord injuries above the splanchnic sympathetic outflow. No
xious stimuli can produce profound alterations in sympathetic pilomoto
r, sudomotor, and vasomotor activity, as well as disturbances in cardi
ac rhythm. A case of autonomic hyyerreflexia in a patient with C6 tetr
aplegia with recurrent ventricular fibrillation and cardiac arrest ill
ustrates the profound effects of massive paroxysmal sympathetic activi
ty associated with this condition.