PHTY103 Lecture 10: PHTY209 week 10
Document Summary
Tens: applies low voltage electrical currents to the skin primarily for pain relief purposes. Used as an adjunct to treatment to control pain, allowing patients to engage in movement and activity. Segmental spinal inhibition and descending inhibition are involved: The gate control theory: stimulation of large diameter ab fibers by tens inhibits nociceptive fiber input in the dorsal horn from progressing up the pathway to the brain (high frequency tens). Release of endogenous opioids: originally thought only in low frequency but now shown for both: 8. 9 define the terms primary hyperalgesia and allodynia. Primary hyperalgesia: increased responsiveness to noxious stimuli at the site of injury. 8. 19 define the terms secondary hyperalgesia and allodynia at a spinal cord level. Secondary hyperalgesia: occurs in zone outside area of tissue injury (over wide surrounding area) Enhanced perception of pain resulting from noxious mechanical stimuli (i. e. pressure), mediated by a fibres.
