NSG 2317 Chapter Notes - Chapter 11: Allodynia, Visual Analogue Scale, Dementia
15 Dec 2016
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Chapter 11 - pain assessment: the fifth vital sign. Most difficult type of pain to assess and treat. Pain: highly complex & subjective experience; originates front cns, pns, or both. Nociceptors detect painful sensations from periphery & transmit to cns; located within skin, ct, muscle, thoracic, abdominal & pelvic viscera. Nociceptors stimulated directly by trauma/injury or secondarily by chemical mediators that are released from tissue damage site. Nociceptors carry pain singal to cns by 3 primary sensory (or afferent) fibres: a & c fibres. A fibres myelinated & larger; transmit pain single rapidly to cns, very localized, short term, & sharp sensations. C fibers unmyelinated, smaller, & transmit single more slowly result in diffuse & aching sensation. Substantia gelatinosa: receives sensory input from various areas of body = pain signals then cross over to other side & ascend to brain by anterolateral spinothalamic tract. Pain is based on its origin, classified as 1.
