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. 1983 Jan;334:293–307. doi: 10.1113/jphysiol.1983.sp014495

Colonic motor and vascular responses to pelvic nerve stimulation and their relation to local peptide release in the cat.

P O Andersson, S R Bloom, J Järhult
PMCID: PMC1197315  PMID: 6191025

Abstract

1. The effects of stimulation of the pelvic nerves in atropinized cats at continuous, low frequencies from 1 to 16 Hz (continuous stimulation) were compared with those of stimulation at higher frequencies (10-160 Hz) delivered in 1 s bursts at 10 s intervals (stimulation in bursts), the latter simulating a commonly observed discharge pattern in vivo. Both types of stimulation evoked a transient vasodilatation. Stimulation in bursts at 20 and 40 Hz evoked more pronounced vasodilatations than continuous stimulation delivering exactly the same number of impulses over the whole period of excitation. 2. Stimulation of the pelvic nerves in bursts failed to elicit an effective contraction of the colon at any frequency tested, whereas continuous stimulation invariably evoked a contraction. 3. There was a clear-cut increase in the output of vasoactive intestinal polypeptide during both continuous and intermittent stimulation of the pelvic nerves. Stimulation in bursts caused a small but significant increase in the output of somatostatin but there was no change in the output of substance P in response to either type of pelvic nerve stimulation. 4. The colonic muscular contraction in response to continuous stimulation of the pelvic nerves was not affected by somatostatin when infused intra-arterially at the large dose of 1.0 microgram/min. 5. It is concluded that the colonic responses of atropinized cats to pelvic nerve stimulation can be substantially altered merely by changing the pattern of stimulation. Thus, whereas continuous stimulation produces both muscular contraction and vasodilatation, stimulation in bursts favours vasodilatation but is ineffective in eliciting colonic contraction.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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