Pain
-
In this prospective cohort study we aimed to describe the natural course of acute neck and low back pain in a general population of Norway. We screened 9056 subjects aged 20-67 years who participated in a general health survey for a new episode of neck or low back pain the previous month. The screening identified 219 subjects who formed the cohort for this study. ⋯ Only 1 in 5 sought health care for their complaints. Still, the course of pain was comparable to effect sizes reported in interventional studies. This study thus contributes natural course reference data for comparisons of pain outcome in clinical trials and practice.
-
Pain hypersensitivity has been consistently detected in chronic pain conditions, but the underlying mechanisms are difficult to investigate in humans and thus poorly understood. Patients with endometriosis pain display enlarged reflex receptive fields (RRF), providing a new perspective in the identification of possible mechanisms behind hypersensitivity states in humans. The primary hypothesis of this study was that RRF are enlarged in patients with musculoskeletal pain. ⋯ Moreover, they also displayed lower NWR and pain thresholds to single and repeated electrical stimulation (P<.001). These results demonstrate that musculoskeletal pain conditions are characterized by enlarged RRF, lowered NWR and pain thresholds, and facilitated temporal summation, most likely caused by widespread spinal hyperexcitability. This study contributes to a better understanding of the mechanisms underlying these pain conditions, and it supports the use of the RRF and NWR as objective biomarkers for pain hypersensitivity in clinical and experimental pain research.
-
Neurovascular coupling during nociceptive processing in the primary somatosensory cortex of the rat.
Neuroimaging methods such as functional magnetic resonance imaging (fMRI) have been used extensively to investigate pain-related cerebral mechanisms. However, these methods rely on a tight coupling of neuronal activity to hemodynamic changes. Because pain may be associated with hemodynamic changes unrelated to local neuronal activity (eg, increased mean arterial pressure [MAP]), it is essential to determine whether the neurovascular coupling is maintained during nociceptive processing. ⋯ However, when the stimulus intensity was kept constant, SI neurovascular coupling was not significantly affected by nociceptive counter-stimulation (P=0.4), which similarly affected the amplitude of shock-evoked LFP and CBF changes. It remains to be determined whether such neurovascular uncoupling occurs in humans, and whether it also affects other regions usually activated by painful stimuli. These results should be taken into account for accurate interpretation of fMRI studies that involve nociceptive stimuli associated with MAP changes.
-
Multicenter Study
Naturalistic parental pain management during immunizations during the first year of life: observational norms from the OUCH cohort.
No research to date has descriptively catalogued what parents of healthy infants are naturalistically doing to manage their infant's pain over immunization appointments during the first year of life. This knowledge, in conjunction with an understanding of the relationships different parental techniques have with infant pain-related distress, would be useful when attempting to target parental pain management strategies in the infant immunization context. This study presents descriptive information about the pain management techniques parents have chosen and examines the relationships these naturalistic techniques have with infant pain-related distress during the first year of life. ⋯ Pacifying and distraction appeared to be most promising in reducing needle-related distress in our sample of healthy infants. Parents in this sample seldom used pharmacological pain management techniques. Given the psychological and physical repercussions involved with unmanaged repetitive acute pain and the paucity of work in healthy infants, this paper highlights key areas for improving parental pain management in primary care.