European journal of pain : EJP
-
Review Meta Analysis
Medication adherence in patients with chronic non-malignant pain: is there a problem?
Health care providers, treating patients with chronic non-malignant pain, often experience that medication is not as effective as expected. It is important to realize that the effectiveness of a pharmacological treatment can be influenced by the way the medication is taken. Medication adherence is a topic that gains more attention, especially in chronic conditions, because it affects treatment outcome. ⋯ Both overuse and underuse of medication occurs. However, due to the scarce literature and important methodological limitations, it is not possible to make firm conclusions concerning the impact on outcome, influencing variables and optimal intervention strategies. This review highlights some important gaps in the adherence literature in a chronic non-malignant pain population and sets the stage for future research.
-
Review Multicenter Study
A structured review of the evidence for pacing as a chronic pain intervention.
Pacing as an intervention appears with great regularity in the chronic pain management literature and yet what service providers actually mean by pacing is unclear and poorly defined. This short communication reports the findings of a structured review of the literature which examined the strength of the evidence for pacing as an intervention for people with chronic pain. ⋯ Although background literature demonstrates that pacing is often one part of a multidisciplinary intervention program, the research conducted on these programs presents pacing itself as an ill- or undefined construct. It is evident from this review that "pacing," while a widely employed term, lacks consensus of definition and a demonstrable evidence-base.
-
Activation of spinal cord microglia and astrocytes is a common phenomenon in nerve injury pain models and is thought to exacerbate pain perception. Following a nerve injury, a transient increase in the presence of microglia takes place while the increased numbers of astrocytes stay elevated for an extended period of time. It has been proposed that activated microglia are crucial for the development of neuropathic pain and that they lead to activation of astrocytes which then play a role in maintaining the long term pathological pain sensation. ⋯ We found that two different types of cancer induced pain resulted in severe spinal astrogliosis without activation of microglia. In contrast, sciatic nerve injury led to a transient activation of microglia and sustained astrogliosis. These results show that development of hypersensitivity and astrocyte activation in pain models can take place independent of microglial activation.
-
The present study investigated the effects of different doses of intrathecal lidocaine on established thermal hyperalgesia and tactile allodynia in the chronic constriction injury model of neuropathic pain, defined the effective drug dose range, the duration of pain-relief effects, and the influence of this treatment on the body and tissues. Male Sprague-Dawley rats were divided into five groups and received intrathecal saline or lidocaine (2, 6.5, 15, and 35 mg/kg) 7 days after loose sciatic ligation. Respiratory depression and hemodynamic instability were found to become more severe as doses of lidocaine increased during intrathecal therapy. ⋯ These findings indicate that intrathecal lidocaine has prolonged therapeutic effects on established neuropathic pain. The balance between sympathetic and parasympathetic nervous activities could be well preserved in most cases, except for 35 mg/kg. Considering the ratio between useful effects and side effects, doses of 15 mg/kg are suitable for intrathecal injection for relief of neuropathic pain.
-
Electrical low-frequency stimulation (LFS) of spinal afferents induces long-term depression (LTD) of nociceptive processing in rodents. LTD and its parameters in man are largely unknown. This study addresses the hypothesis that LTD of spinal nociception and pain in man depends on LFS frequency (0.5, 1, 2 Hz), number of electrical pulses (300, 600, 1200), intensity (relating to pain threshold I(P): 1 x I(P), 2 x I(P), 4 x I(P)), and on LFS repetition. ⋯ LFS with intensities 2 x I(P) and 4 x I(P) evoked sustained depression of SEP and pain perception in comparison to Control and 1 x I(P) LFS. Established LTD after single LFS was amplified by an additional second LFS. Hence this study provides electrophysiological and psychophysical evidence for LTD of spinal nociceptive processing and pain perception in man and indicates appropriate LFS parameters 1 Hz, 1200 pulses and 4 x I(P) for future studies on human LTD.