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It has been confirmed that the voltage-gated persistent sodium currents mediate the generation of subthreshold membrane potential oscillations (SMPOs) and contribute to shaping repetitive firing. Our previous study indicated that gabapentin (GBP) administration induced a dose-dependent inhibition of SMPO in chronically compressed dorsal root ganglion (CCD) neurons. To investigate the mechanisms and...
In 10 patients with central post-stroke pain (CPSP), the influence of ischemia-induced heterotopic noxious conditioning stimulation (HNCS) on the intensity of spontaneous ongoing- and brush-evoked pain was examined. In addition, the modulating effect of ongoing pain and HNCS on pain sensitivity in a remote pain-free area was explored. A semi-quantitative brushing technique was employed in combination...
Procedural pain in the neonatal intensive care unit triggers a cascade of physiological, behavioral and hormonal disruptions which may contribute to altered neurodevelopment in infants born very preterm, who undergo prolonged hospitalization at a time of physiological immaturity and rapid brain development. The aim of this study was to examine relationships between cumulative procedural pain (number...
Results from recent functional neuroimaging studies suggest that facial expressions of pain trigger empathic mimicry responses in the observer, in the sense of an activation in the pain matrix. However, pain itself also signals a potential threat in the environment and urges individuals to escape or avoid its source. This evolutionarily primitive aspect of pain processing, i.e., avoidance from the...
Neural, endocrine, and immune stress mediators are hypothesized to increase risks of diverse chronic diseases, including arthritis. Retrospective data from the World Mental Health Surveys (N=18,309) were employed to assess whether adult onset of arthritis was associated with childhood adversities and early onset psychological disorder. Cox proportional hazard models assessed the association of number...
Preclinical studies have suggested that opioid exposure may induce a paradoxical decrease in the nociceptive threshold, commonly referred as opioid-induced hyperalgesia (OIH). While OIH may have implications in acute and chronic pain management, its clinical features remain unclear. Using an office-based quantitative sensory testing (QST) method, we compared pain threshold, pain tolerance, and the...
Dystonia in complex regional pain syndrome (CRPS) responds poorly to treatment. Intrathecal baclofen (ITB) may improve this type of dystonia, but information on its efficacy and safety is limited. A single-blind, placebo-run-in, dose-escalation study was carried out in 42 CRPS patients to evaluate whether dystonia responds to ITB. Thirty-six of the 38 patients, who met the responder criteria received...
The sensation of pain is important and there may be serious consequences if it is missing. Recently, the genetic basis for a channelopathy characterised by a congenital inability to experience pain has been described and channelopathy-associated insensitivity to pain has been proposed as a suitable name for this condition. Different mutations in the SCN9A gene causing loss of function of the voltage-gated...
Recently, we demonstrated a spinal GABA A receptor (GABA A R)-dependent inhibition on the induction of repetitive stimulation-induced spinal reflex potentiation. However, it remains unclear whether steroid hormones modulate such an inhibition. Here, we show that progesterone is capable of producing GABA A Rs-dependent inhibition of the induction of spinal reflex potentiation...
Pain assessment and treatment is influenced by patient demographic characteristics and nonverbal expressions. Methodological challenges have limited the empirical investigation of these issues. The current analogue study employed an innovative research design and novel virtual human (VH) technology to investigate disparities in pain-related clinical decision-making. Fifty-four nurses viewed vignettes...
Sensory neuron-specific receptors (SNSRs) belong to a large family of GPCRs, known as Mrgs (Mas-related genes), many of which are preferentially expressed in primary afferent nociceptors. Selective SNSR agonists produce pain-like behaviors in rats, showing that SNSR activation is sufficient to produce pain. However, it is unknown whether SNSR activation is necessary for pain either in the normal condition...
Chronic widespread pain (CWP) is a common and frequently disabling condition. Several studies have shown that early life adversity is associated with CWP in later life; however, the majority are retrospective and suffer from potential recall bias. Using data from the 1958 British Birth Cohort Study, the aim of the current study was to examine, prospectively, the relationship between childhood physical...
Pain, among the most common symptoms of cancer, impacts on multiple domains of wellbeing. Significant numbers of patients continue to experience pain despite pharmacological interventions. Although there is evidence to suggest that acceptance of pain is related to better wellbeing among patients with chronic nonmalignant pain, little is known about acceptance of cancer pain. The purpose of this cross-sectional...
Pain memory is thought to affect future pain sensitivity and thus contribute to clinical pain conditions. Systematic investigations of the human capacity to remember sensory features of experimental pain are sparse. In order to address long-term pain memory, nine healthy male volunteers received intradermal injections of three doses of capsaicin (0.05, 1 and 20μg, separated by 15min breaks), each...
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