Distal colon motility and clinical parameters in depression.

Eighty-six patients suffering from nonpsychotic unipolar major depressive disorder, according to Research Diagnostic Criteria, were rated on a modified Hamilton Rating Scale for Depression (HRS). All completed the self-rating Beck Depression Inventory (BDI). Distal colon motility (dcm) studies, performed in all the patients, differentiated two types: low intestinal tone (low-IT) = 40 subjects, and high intestinal tone (high-IT) = 46 subjects. Low-IT depressed patients showed a statistically significant preponderance in the HRS items 'retardation', 'somatization', 'fatigability', 'hypochondriasis' and 'obsessional symptoms'. The high-IT depressed patients, on the other hand, showed preponderance in the items 'guilt', 'suicide', 'insomnia', 'agitation', 'anxiety psychic', 'loss of insight', 'depersonalization' and 'paranoid symptoms'. A positive correlation (r) was found between HRS- and BDI-mean total scores. In addition, a positive correlation (r) was found between HRS scores and distal colon tone in high-IT patients, although the same was not true for low-IT patients. Our results suggest the existence of two subtypes of depressive syndromes, distinguishable on the basis of distal colon motility profiles.