1 Pain Intro Flashcards
Pain
Unpleasant sensory and emotional experience associated with actual or potential tissue damage or described in terms of such damage
Allodynia
Pain due to a stimulus that does not normally provoke pain
Ex) complex regional pain syndrome
Feather feels like pain
Hyperalgesia
Increased pain from stimulus that normally provokes pain
higher intensity perception
Sensitization
Increased responsiveness of nociceptive neurons to their normal input and/or recruitment of a response to normally subs threshold inputs
(less input required)
Central
Increased responsiveness of nociceptive neurons in the central nervous system to their normal or sub-threshold input
(changes in how the centers of brain perceive pain)
Peripheral
Increased responsiveness and reduced threshold of nociceptive neurons in the periphery to the stimulation of their receptive fields
(amount of neurons changes
What are the Pain Afferents
Slow fibers
Alpha and C fibers
What are the fast fibers?
AB
Summation
Progressive build up
Specificity Theory
Specific nerve to specific region of the body/Brain region
Weakness: Pan after nerve injury. phantom limb
Hyperalgesia/Allodynia
Pattern Theory
Nerve conduct info via specific and particular patterns
no specificity of receptors
Weakness: Scientifically proven receptor differentiation ignored
Gate Theory
Specificity + Pattern
Pain stimulus -> inhibitory
Weakens transmission of pain due to other stimulus
Central Control Trigger
Neural tract - faster than pain pathway
Send info on location/extent of injury
Elicits descending efferent activity (influences gate)
Brain modulates coming info
Changes focus to area that was injured
Weakness of Gate Theory
Ignores psychological/mood components
Over simplified
Premise - neural system is hard
Current research states neural plasticity - altered (thresholds, neurotransmitter density, descending control, cortical activity)
Pain Matrix
Body response based on multitude of factors going on
Perceptions of pain based on whats going on around them
