Randomised clinical trial: pregabalin attenuates experimental visceral pain through sub-cortical mechanisms in patients with painful chronic pancreatitis.

Abstract:

BACKGROUND:Pregabalin has a broad spectrum of analgesic and antihyperalgesic activity in both basic and clinical studies. However, its mechanisms and sites of action have yet to be determined in humans. AIMS:To assess the antinociceptive effect of pregabalin on experimental gut pain in patients with visceral hyperalgesia due to chronic pancreatitis and to reveal putative changes in corresponding central pain processing as assessed by evoked brain potentials. METHODS:Thirty-one patients were randomly assigned to receive increasing doses of pregabalin or placebo for three consecutive weeks. Perceptual thresholds to electrical stimulation of the sigmoid with recording of corresponding evoked brain potentials were obtained at baseline and study end. The brain source localisations reflecting direct neuronal activity were fitted by a five-dipole model projected to magnetic resonance imaging of the individuals' brains. RESULTS:As compared to placebo, pregabalin significantly increased the pain threshold to electrical gut stimulation from baseline (P=0.02). No differences in evoked brain potential characteristics were seen, neither after pregabalin nor placebo treatment (all P>0.05). In agreement with this, brain source locations remained stable during study treatment (all P>0.05). CONCLUSION:Pregabalin was superior to placebo for attenuation of experimental visceral pain in chronic pancreatitis patients. We suggest its antinociceptive effects to be mediated primarily through sub-cortical mechanisms.

journal_name

Aliment Pharmacol Ther

authors

Olesen SS,Graversen C,Olesen AE,Frøkjaer JB,Wilder-Smith O,van Goor H,Valeriani M,Drewes AM

doi

10.1111/j.1365-2036.2011.04802.x

subject

Has Abstract

pub_date

2011-10-01 00:00:00

pages

878-87

issue

8

eissn

0269-2813

issn

1365-2036

journal_volume

34

pub_type

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