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By: L. Finley, M.B. B.CH., M.B.B.Ch., Ph.D.
Assistant Professor, California Health Sciences University
Abnormalities of function Central mechanisms associated Somatic pain associated with with visceral pain may be somatic dysfunction antiviral influenza drugs buy zovirax. It is for this reason that the early stages of assessment include looking for these pathologies  antiviral cream 800 mg zovirax amex. Once excluded hiv infection by race purchase cheapest zovirax, ongoing investigations for these causes are rarely helpful and indeed may be detrimental. When acute pain mechanisms are activated by a nociceptive event, as well as direct activation of the peripheral nociceptor transducers, sensitisation of those transducers may also occur, therefore magnifying the afferent signalling. Afferents that are not normally active may also become activated by the change, that is, there may be activation of the so-called silent afferents. Although these are mechanisms of acute pain, the increased afferent signalling is often a trigger for the chronic pain mechanisms that maintain the perception of pain in the absence of ongoing peripheral pathology (see below) [70, 71]. There are a number of mechanisms by which the peripheral transducers may exhibit an increase in sensibility. Modification of the peripheral tissue, which may result in the transducers being more exposed to peripheral stimulation. There may be an increase in the chemicals that stimulate the receptors of the transducers . There are many modifications in the receptors that result in them being more sensitive. Some of the chemicals responsible for the above changes may be released from those cells associated with inflammation, but the peripheral nervous system may also release chemicals in the positive and inhibitory loops [73-75]. Central sensitisation as a mechanism in visceral pain It is important to appreciate that nociception is the process of transmitting information to centres involved in perception of a stimulus that has the potential to cause tissue damage. Pain is far more complex and involves activation of the nociceptive pathways but also the emotional response. Central sensitisation  is responsible for a decrease in threshold and an increase in response duration and magnitude of dorsal horn neurons. As an example, for cutaneous stimuli, light touch would not normally produce pain, however, when central sensitisation is present, light touch may be perceived as painful (allodynia). In visceral hyperalgesia (so called because the afferents are primarily small fibres), visceral stimuli that are normally sub-threshold and not usually perceived, may be perceived. For instance, with central sensitisation, stimuli that are normally subthreshold may result in a sensation of fullness and a need to void or to defecate. Non-noxious stimuli may be interpreted as pain and stimuli that are normally noxious may be magnified (true hyperalgesia) with an increased perception of pain. It is now well accepted that there are both descending pain-inhibitory and descending pain-facilitatory pathways that originate from the brain . Several neurotransmitters and neuromodulators are involved in descending pain-inhibitory pathways. There is good evidence that damaged afferent fibres may develop a sensitivity to sympathetic stimulation, both at the site of injury and more centrally, particularly in the dorsal horns. These functional abnormalities can have a significant effect on QoL and must be managed as appropriate. Psychological mechanisms in visceral pain Psychological processes of emotions, thought and behaviour involve networks rather than distinct centres. Some of these processes are sophisticated and others fundamental in evolutionary terms, and their interaction with pain processing is complex. Inhibiting or facilitating both the nociceptive signal reaching the consciousness and appraisal and interpretation of that signal, will also modulate the response to the nociceptive message and hence the pain experience. Further, descending pathways represent cognitive, emotional and behavioural states at spinal and peripheral levels. For instance, mood and attentional focus probably act through different areas of the brain when involved in reducing pain . This psychological modulation may act to reduce nociception within a rapid time frame but may also result in long-term vulnerability to chronic visceral pain, through long-term potentiation. This involvement of higher centre learning may be at both a conscious and subconscious level, and is clearly significant in the supratentorial neuroprocessing of nociception and pain. Long-term potentiation  may occur at any level within the nervous system, so that pathways for specific or combinations of stimuli may become established, resulting in an individual being vulnerable to perceiving sensations that would not normally be experienced as painful. Women with pelvic pain often have other non-pain somatic symptoms, and current or lifetime anxiety and depression disorder ; they may have a history of physical or sexual abuse in childhood of unclear significance.
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