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Conditioned Pain Modulation in Patients With Acute and Chronic Low Back Pain

PainSci » bibliography » Mlekusch et al 2016
updated

Two pages on PainSci cite Mlekusch 2016: 1. The Complete Guide to Low Back Pain2. Chronic Pain as a Conditioned Behaviour

PainSci notes on Mlekusch 2016:

Low back patients may have an impaired ability to neurologically control their own pain, and that idea is supported by this test of several dozen acute and chronic cases, compared to some healthy people. Specifically they found reduced “conditioned pain modulation.” This provides some evidence for “disturbed endogenous pain modulation.”

original abstract Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.

OBJECTIVES: Disturbed endogenous pain modulation is likely one of the mechanisms underlying central hypersensitivity and might be a contributing factor for the development and maintenance of chronic pain. To our knowledge, no study has investigated endogenous pain modulation in both acute and chronic low back pain (LBP). We tested the hypothesis that endogenous pain inhibition is impaired in patients with acute and chronic LBP.

MATERIALS AND METHODS: We evaluated 40 patients with acute LBP, 34 patients with chronic LBP and 30 pain-free controls for their conditioned pain modulation (CPM), with pressure pain tolerance and cold pressor as test and conditioning stimulus, respectively. Measurements were repeated up to 10 minutes after cold pressor test.

RESULTS: There was no difference in CPM among the groups immediately after cold pressor test. However, the decline in CPM effect was significantly faster in chronic and acute LBP patients than in controls, with no evidence for differences between pain groups.

DISCUSSION: The present study provides evidence for some alterations of endogenous modulation in both acute and chronic LBP. CPM was still detected in both patient groups, indicating that endogenous modulation, although effective for a shorter duration, is partially functioning in patients with LBP.

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