Articles: hyperalgesia.
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Randomized Controlled Trial
Experimental pelvic pain facilitates pain provocation tests and causes regional hyperalgesia.
The extra-articular sacroiliac joint (SIJ) structure is a potential source for low back and pelvic pain. This study hypothesised that experimental pain induced in a superficial pelvic ligament causes (1) hyperalgesia to pressure, (2) distinct pain referral, and (3) an increased frequency of positive pain provocation tests of the SIJ complex. Thirty healthy subjects (15 females) participated in this study designed as a randomised crossover trial. ⋯ PPTs at the injection site and lateral to S2 were significantly reduced after hypertonic saline compared with baseline and isotonic saline (P<0.002). Significantly more subjects had positive pain provocation tests after hypertonic (67% of subjects) compared with isotonic saline (20%; P<0.001). These data demonstrate that the extra-articular SIJ structure accommodates nociceptors that are capable of inducing pain referral and regional hyperalgesia sensitive to manual pain provocation tests similar to what previously have been found in pelvic girdle pain patients.
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Randomized Controlled Trial
Effectiveness of water physical therapy on pain, pressure pain sensitivity, and myofascial trigger points in breast cancer survivors: a randomized, controlled clinical trial.
To evaluate the effects of an 8-week water physical therapy program on cervical and shoulder pain, pressure sensitivity, and the presence of trigger points (TrPs) in breast cancer survivors. ⋯ An 8-week water therapy program was effective for improving neck and shoulder/axillary pain, and reducing the presence of TrPs in breast cancer survivors as compared with usual care; however, no significant changes in widespread pressure pain hyperalgesia were found.
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Eur J Gastroenterol Hepatol · Nov 2012
Randomized Controlled TrialThe effect of acute serotonergic modulation on rectal motor function in diarrhea-predominant irritable bowel syndrome and healthy controls.
Irritable bowel syndrome (IBS) patients suffer from visceral hypersensitivity and show increased activity in the brain emotional arousal network following a rectal stimulus, compared with controls. Serotonergic activity can be decreased by acute tryptophan depletion (ATD), which increases visceral perception and also increases activity in the brain's emotional arousal network during rectal stimulation. Treatment with a serotonin reuptake inhibitor such as citalopram is effective in some IBS patients. Hence, serotonergic modulation alters visceral perception. However, it is not clear whether serotonergic modulation alters rectal motor function. ⋯ d-IBS patients have disturbed rectal pressure-volume relations. Visceral perception in IBS is associated with both increased activity in the brain's emotional arousal network and decreased RC. Acutely decreasing or increasing serotonergic activity does not affect these characteristics in d-IBS patients or healthy controls. The pathophysiology in d-IBS contains both a rectal motor component and a central neuropsychologic component.
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Randomized Controlled Trial Clinical Trial
Interaction of fentanyl and buprenorphine in an experimental model of pain and central sensitization in human volunteers.
: There is controversy about combining opioids with different receptor affinities. We assessed the analgesic and antihyperalgesic effects of the μ-agonist fentanyl and the partial μ-agonist/κ-antagonist buprenorphine in a human pain model, when given alone or in combination. ⋯ : For the doses administered in this study, buprenorphine and fentanyl showed an additive interaction.
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Randomized Controlled Trial Multicenter Study
Viscerosomatic facilitation in a subset of IBS patients, an effect mediated by N-methyl-D-aspartate receptors.
Irritable bowel syndrome (IBS) is a common gastrointestinal disorder in which the pathophysiological mechanisms of the pain and hypersensitivity are incompletely understood. IBS patients frequently complain of pain in body regions somatotopically distinct from the gut, suggesting involvement of central hyperalgesic mechanisms. We tested the role of tonic peripheral impulse input by using both repetitive thermal stimuli to the leg and repetitive stimuli to the rectum. Changes in thermal/visceral pain sensitivity after nociceptive thermal/visceral repetitive stimulation were determined. A subset of IBS patients showed enhanced rectal/thermal pain sensitivity after repetitive thermal/rectal stimulation, respectively. IBS patients then received 60 mg dextromethorphan and placebo (diphenhydramine) in a randomized, double-blind, crossover trial. The results showed that 1) a subset of IBS patients had increased visceral/cutaneous hypersensitivity following a series of repetitive nociceptive stimuli and that 2) this increased pain sensitivity was blocked by administration of dextromethorphan. This is the first human study indicating that repetitive stimulation enhances a bidirectional mechanism of secondary hyperalgesia due to viscerosomatic facilitation in IBS patients. These unique findings elucidate mechanisms of somatic hypersensitivity in IBS patients and support an etiologic basis for abnormal N-methyl-D-aspartate receptor mechanisms that may be the target of future therapies for IBS. ⋯ Repetitive stimulation enhances a bidirectional mechanism of secondary hyperalgesia due to viscerosomatic convergence in IBS patients. The findings elucidate unique mechanisms of somatic/visceral hypersensitivity in a subset of IBS patients and further support an etiologic basis for abnormal N-methyl-D-aspartate receptor mechanisms that may be future targets of therapies for IBS.