The activity of monoamine oxidase (MAO) was studied during functional, inflammatory and tumoral diseases of the large intestine. In the patients with the irritable colon syndrome, the enzymatic activity was decreased by 34% at the acute stage of the disease and in those with nonspecific ulcerative colitis it was increased by 44%. Follow-ups of MAO activity may serve as an indicator of the adequacy and efficiency of the treatment performed.
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