The journal of pain : official journal of the American Pain Society
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Randomized Controlled Trial
Test order of quantitative sensory testing facilitates mechanical hyperalgesia in healthy volunteers.
Quantitative sensory testing (QST) has become a widely used method to evaluate different submodalities of the somatic sensory system (predominantly) in patients with neuropathic pain. QST consists of 7 tests measuring 13 parameters in order to assess and quantify the perception of temperature, touch, pain, pressure, and vibration. The German Research Network on Neuropathic Pain implemented a standardized QST protocol including a defined testing order of the measurements. Accordingly, subjects tested with QST undergo thermal before mechanical testing. In the present study, we investigated the effect of testing order on the results of QST. Twenty healthy subjects were tested twice, 1 week apart with 2 different QST testing orders: the standardized testing order according to the German Research Network on Neuropathic Pain and a modified testing order in which mechanical stimuli were applied before thermal stimuli. For the test protocol that began with thermal testing, subjects exhibited signs of an increased mechanical perception: The mechanical pain sensitivity was significantly increased (P = .001, Wilcoxon test) for each pinprick stimulator and the mechanical pain threshold was lowered by a factor of 2 when compared with the modified testing order in which mechanical parameters were tested at the beginning of the session without prior thermal stimulation. Thermal parameters were the same for both test-order paradigms. These data indicate that preceding mild thermal stimulation might lead to a sensitization to mechanical stimuli and thus to mechanical hyperalgesia. Alternative habituation mechanisms in the modified testing order resulting from repeated pinprick stimulation at the beginning should also be debated. QST is a helpful diagnostic tool but interpretation should be done with consideration of interaction between test parameters. Reference data are only valid in the testing order from which they are obtained. ⋯ Present data showed that mechanical hyperalgesia followed thermal testing. This article demonstrates that the test order of quantitative sensory testing is relevant in interpreting the results obtained. Reference values are suitable in the test order from which they are obtained.
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Randomized Controlled Trial
Training for general practitioners in opioid prescribing for chronic pain based on practice guidelines: a randomized pilot and feasibility trial.
This study is a pilot and feasibility study that compares 2 training experiences to improve appropriate opioid prescribing for chronic pain. Both training conditions included education in relation to opioid guidelines. Following education, 1 condition included training aimed at improving psychological flexibility and the other included training in practical knowledge and skills related to pain management. Eighty-one general practitioners (GPs) took part in the study, each having been randomly assigned to 1 of the training conditions. It proved easy to recruit GPs to the training. Overall, GPs demonstrated increased knowledge of opioid prescribing for chronic pain and decreases in concerns related to prescribing following training. However, there were no changes observed in reported prescribing practices or in secondary measures of well-being. There were also no significant differences between the training conditions, other than a greater increase in intention to use prescribing guidelines in the psychological flexibility condition. Feasibility and acceptability of the training methods were generally rated high. The psychological flexibility condition was rated higher than the comparison condition in terms of interest and satisfaction. Finally, processes of psychological flexibility before and after training significantly correlated with measures of GP well-being, providing partial support for the relevance of these processes as a focus in GP training. ⋯ A training intervention for GPs including education on opioid guidelines for chronic pain and psychological flexibility training increased knowledge of prescribing and reduced concerns but did not change prescribing behavior or well-being. The training was highly acceptable to GPs but may have been too short to produce other effects.