Colonic dysfunction in multiple sclerosis.

Multiple sclerosis is a central nervous system disease frequently accompanied by urinary symptoms and severe constipation. In order to investigate the pathophysiology of these symptoms, we studied colonic motor and myoelectrical activity, as well as colonic volume-pressure relationships (colonometrograms) and have correlated these data with cystometry and electrophysiologic studies of the central and peripheral somatosensory nervous system. The study group consisted of 7 patients with advanced multiple sclerosis marked by symptoms and signs of somatic and visceral nervous system dysfunction including severe constipation. Ten normal volunteers served as control subjects. The multiple sclerosis group demonstrated electrophysiologic evidence of lesions in the somatosensory neuroaxis central to the lumbosacral spinal cord. Abnormal cystometrograms suggested visceral central nervous system dysfunction. Colonometrograms in the multiple sclerosis group demonstrated a more rapid pressure rise than in the control group (p less than 0.01). The multiple sclerosis group failed to demonstrate the postprandial increase in colonic motor and myoelectrical activity observed in the control group (p less than 0.01). Abnormal colonometrograms and absent postprandial colonic motor and myoelectric responses may be features of visceral neuropathy in patients with advanced multiple sclerosis and severe constipation.