Pain
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It is commonly accepted that application of a sustained noxious stimulus frequently suppresses the perception of pain. In this investigation, we have determined whether painful forearm ischemia suppresses tooth pain resulting from an acute irreversible pulpitis. We have also determined whether the physiological responses to toothache alter the perception of pain evoked by experimental procedures. ⋯ In contrast, sustained noxious forearm ischemia produced a marked reduction in the intensity, unpleasantness and spatial distribution of pulpal pain. These effects on pulpal pain remained for at least 5 min after removal of the tourniquet while the arm was pain free. These findings suggest that a noxious conditioning stimulus does not universally inhibit pain perception but instead depends on unidentified interactions between the noxious test and conditioning stimuli.
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The health care system has moved towards home care, early discharge, and day procedures. Parents in the home are, therefore, far more likely to be managing their children's postoperative pain than health professionals. The purpose of this study was to describe mothers' experiences in identifying and managing their children's acute pain associated with surgery. ⋯ A purposive, convenience sample of 7 mothers whose children were 4-8 years old and who had a day-surgery adenoid-tonsillectomy were interviewed in depth (2-3 interviews per mother). Four themes were found in the data: (1) mothers' descriptions of their children's overall pattern of postoperative pain indicated that pain was minimal or absent before surgery, increased following surgery, and decreased with medicine and healing; (2) mothers' assessment and evaluation of their children's pain used pain cues similar to those used by nurses and physicians; (3) all the mothers worried about drug addiction; and 4) mothers learned to manage their children's pain through 'trial and error'. This study provides beginning data for understanding family management of children's pain.
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Recent investigations have shown that non-steroidal antiinflammatory drugs (NSAIDs) may exert an antinociceptive effect when administered at or within the central nervous system (CNS). This might be due to the engagement of CNS substrates that support the analgesic effects of opiates, including the periaqueductal gray matter (PAG) and the rostral ventromedial medulla (RVM). The off- and on-cells of the RVM have been proposed to inhibit and facilitate, respectively, nociceptive transmission. ⋯ Neuronal response and TF retained their mutual time relationship but shifted pari passu toward longer latencies. This antinociception was apparent already 5 min post-injection and reached a maximum in 50-60 min for i.v. administration and 30-35 min for PAG microinjection. These results confirm other authors' findings of the direct antinociceptive action of NSAIDs upon PAG, and provide the first evidence for a plausible involvement of RVM off- and on-cells in such antinociceptive effect.
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A consecutive sample of 53 chronic cancer pain patients were administered 5 different pain intensity scales: a visual analogue scale (VAS), a numerical rating scale from 0 to 10 (NRS), a verbal rating scale (VRS), the Italian Pain Questionnaire (Italian version of the McGill Pain Questionnaire) (PRI), and the Integrated Pain Score (IPS) which is an instrument designed at the Pain Therapy and Palliative Care Division of the National Cancer Institute of Milan to integrate pain intensity and duration in a single measure. These scales were administered before and after a definite therapy change. ⋯ A single factor clearly emerged explaining most of the different scales variability. A logistic regression analysis showed that VAS, NRS, VRS were more strongly associated with IRS than PRI and IPS.
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The streptozocin-induced diabetic rat has been put forward as a model of chronic pain with signs of hyperalgesia and allodynia that may reflect signs observed in diabetic humans. The aim of this work was to assess, in streptozocin-induced diabetic rats, the pharmacological activity to several analgesic drugs known to be effective (clomipramine, amitriptyline, desipramine, clonidine, lidocaine), ineffective (aspirin), or with a doubtful effectiveness (morphine) in human painful diabetic neuropathy. The animals were submitted to a mechanical pain test (paw pressure) and the ability of the drugs to reverse diabetes-induced hyperalgesia was tested. ⋯ Lidocaine (1-9 mg/kg, i.v.) had prolonged efficacy on mechanical hyperalgesia. Aspirin (100 mg/kg, i.v.) was without effect and morphine (0.5-4 mg/kg, i.v.) induced a dose-dependent antinociceptive effect but at doses twice as high as those used in normal rats. These results demonstrate the high pharmacological predictivity of this model of painful diabetes and suggest that in this pathological condition, among the drugs acting on monoaminergic transmission, noradrenergic drugs seem the most active.