Microchip implants on the anterior sacral roots in patients with spinal trauma: does it improve bowel function?

Abstract

Purpose: This study evaluated the effect of anterior sacral roots stimulator implants on bowel function of patients with spinal cord trauma.

Method: Eight patients with spinal cord injury and constipation had anterior sacral roots stimulator implants inserted for concomitant bladder dysfunction. Questionnaires on bowel function and anorectal manometry tests were given before and after insertion of the implants.

Results: Six patients achieved improvement in bowel function. Four of these patients could defecate spontaneously following stimulation. Two patients had no improvement in bowel function. Anorectal manometry studies showed a negative rectoanal pressure difference at the time of stimulation. All patients were unable to defecate during stimulation. Positive rectoanal pressure difference was recorded in the six patients who had improved bowel function. This may be attributable to the slower relaxation of the smooth rectal muscle compared with the easily fatigable striated external anal sphincter.

Conclusion: Anterior sacral roots stimulator implants can improve bowel function in patients with spinal cord trauma.