Mechanical Pain Thresholds (mechanical + pain_threshold)

Distribution by Scientific Domains

Selected Abstracts

Electroacupuncture for Tension-type Headache on Distal Acupoints Only: A Randomized, Controlled, Crossover Trial

HEADACHE, Issue 4 2004
C. C. L. Xue PhD
Objective.,To investigate the efficacy of electroacupuncture, applied to distal acupoints only, for tension-type headache. Background.,Electroacupuncture is commonly used for tension-type headache, but when applied to distal acupoints only, evidence of its efficacy is lacking. Design.,A randomized, single-blinded, sham-controlled, crossover clinical trial. Methods.,The trial had 5 stages: baseline (2 weeks), phases I and II (each 4 weeks), washout period (2 weeks), and follow-up (3 months after phase II). Forty patients were randomly assigned to either group A or group B. Group A received real electroacupuncture during phase I, then sham electroacupuncture in phase II. Group B received the treatments in reverse order. Outcome measures were headache frequency and duration, pain intensity using a visual analog scale, mechanical pain threshold, headache disability, and sickness impact. Data were analyzed by univariate 2-way analysis of variance. Results.,Thirty-seven patients completed the trial. There were no significant differences between the 2 groups at baseline. At the end of phase I, group A, but not group B, demonstrated significant improvement in mean (standard error of the mean [SEM]) headache frequency (3.0 per month [0.3] versus 12.0 per month [1.7]), duration (13.3 hours [3.5] versus 32.0 hours [6.2]), pain intensity (32.8 mm [4.1] versus 47.5 mm [2.7]), pain threshold (right side, 2.9 kg/second [0.1] versus 0.9 kg/second [0.1]; left side, 2.4 kg/second [0.1] versus 1.1 kg/second [0.1]), headache disability score (6.0 [1.0] versus 16.3 [1.6]), and sickness impact score (288.7 [48.0] versus 687.1 [77.2]). For each parameter, significant differences also were demonstrated for both groups between baseline and phase II, and baseline and follow-up. There were no significant differences between the groups at the end of follow-up (P > .05). Conclusion.,Electroacupuncture to distal points alone is effective for short-term symptomatic relief of tension-type headache. [source]

Induction of prolonged tenderness in patients with tension-type headache by means of a new experimental model of myofascial pain

H. Mørk
Tenderness is the most prominent abnormal finding in patients with tension-type headache (TTH). Recently we developed a model of myofascial tenderness using intramuscular infusion of a combination of bradykinin, serotonin, histamine and prostaglandin E2. We aimed to examine tenderness after this combination in patients with episodic TTH (ETTH). Fifteen patients and 15 healthy controls completed the study. Participants received the combination into the non-dominant trapezius muscle in a randomized, double-blinded and placebo-controlled design. Local tenderness and stimulus,response functions, mechanical pain thresholds (PPDT) in the temporal region and on the finger, and total tenderness score (TTS) were recorded. A local, prolonged, and mild to moderate tenderness was reported both in patients (P = 0.001) and in controls (P = 0.001) after the combination compared with the placebo. The response to the combination tended to be increased in patients. The stimulus,response function was leftward shifted after the combination, compared with baseline in both groups. No changes in PPDT or TTS were found after the infusions, whereas baseline PPDTs were decreased in ETTH compared with controls (PPDTfinger: P = 0.033; PPDTtemporal: P = 0.015). Intramuscular infusion of a combination of endogenous substances induced prolonged tenderness in both patients with episodic TTH and healthy subjects. The present results suggest an increased excitability of peripheral muscle afferents in TTH. [source]

Influence of deep brain stimulation and levodopa on sensory signs in Parkinson's disease,

Janne Gierthmühlen MD
Abstract To examine the effects of levodopa (L -dopa) and deep brain stimulation of the subthalamic nucleus (STN-DBS) on sensory symptoms and signs in Parkinson's disease (PD). Seventeen patients with PD were included. (1) Presence of sensory symptoms and (2) effects of L -dopa and STN-DBS on sensory symptoms and signs [assessed by quantitative sensory testing (QST)] were examined 6 months after starting STN-DBS. In addition, in 12 of these patients, presence of sensory symptoms prior and post STN-DBS was compared. Pain was most frequently nociceptive. In about 30,40%, pain and sensory symptoms were associated with PD motor symptoms. In most of these cases, pain responded to L -dopa. Intensity of pain was reduced post STN-DBS compared to pre STN-DBS. L -Dopa had no influence on detection thresholds, whereas STN-DBS improved thermal detection thresholds. However, thermal and mechanical pain thresholds were uninfluenced by L -dopa or STN-DBS. Although some patients reported an improvement of pain with STN-DBS or L -dopa, objectively pain sensitivity as assessed by QST was not altered by STN-DBS or L -dopa suggesting that there is no evidence for a direct modulation of central pain processing by L -dopa or STN-DBS. © 2010 Movement Disorder Society [source]

A Pilot Study Investigating the Effects of Fast Left Prefrontal rTMS on Chronic Neuropathic Pain

PAIN MEDICINE, Issue 5 2009
Jeffrey J. Borckardt PhD
ABSTRACT Objective., Stimulating the human cortex using transcranial magnetic stimulation (TMS) temporarily reduces clinical and experimental pain; however, it is unclear which cortical targets are the most effective. The motor cortex has been a popular target for managing neuropathic pain, while the prefrontal cortex has been investigated for an array of nociceptive pain conditions. It is unclear whether the motor cortex is the only effective cortical target for managing neuropathic pain, and no published studies to date have investigated the effects of prefrontal stimulation on neuropathic pain. Design., This preliminary pilot trial employed a sham-controlled, within-subject, crossover design to evaluate clinical pain as well as laboratory pain thresholds among four patients with chronic neuropathic pain. Each participant underwent three real and three sham 20-minute sessions of 10 Hz left prefrontal repetitive TMS. Daily pain diaries were collected for 3 weeks before and after each treatment phase along with a battery of self-report pain and mood questionnaires. Results., Time-series analysis at the individual patient level indicated that real TMS was associated with significant improvements in average daily pain in 3 of the 4 participants. These effects were independent of changes in mood in two of the participants. At the group level, a decrease of 19% in daily pain on average, pain at its worst, and pain at its least was observed while controlling for changes in mood, activity level and sleep. The effects of real TMS were significantly greater than sham. Real TMS was associated with increases in thermal and mechanical pain thresholds, whereas sham was not. No statistically significant effects were observed across the questionnaire data. Conclusions., The prefrontal cortex may be an important TMS cortical target for managing certain types of pain, including certain neuropathic pain syndromes. [source]