Week 3 Flashcards
(158 cards)
How is nociceptive pain normally terminated?
By the healing and repair process
What is the key locus in the endogenous pain suppressant neural system (modulation)
Mesencehapilic Periacqueductal gray: enkephalin containing neurons.
It’s a multisynpatic pathway descending to dorsal horn of cord
What is another term for the endogenous opioid peptides?
Endorphins
Enkephalin is made out of ___ amino acids (___ and ___). Enkephalin binds to which to receptors?
5 amino acids
Methionine and leucine
Mu and delta
B-endorphin is made out of __ amino acids and binds to which two receptors?
91 amino acids
Binds to mu and delta
Other than affecting the pain pathway, what else do endorphins play a role in?
Stress
GI function
Endocrine systems
Affect the reward pathway (increase dopamine release through mesolimbic system)
Dynorphins A and B is made out of ___ amino acids and binds to which receptors? What i unique about dynorphins?
17 amino acids
Primarily K (kappa) receptors
Dynorphins are unique because they are dysphoric. This means that although it can block pain, it causes an unpleasant feeling, so there is no addiction potential
Endogenous opioid peptides (endorphins) play a key role in ___ feedback and other physiological processes
Inhibitory.
Negative feedback
Drugs that enhance the action of __ and __ in the CNS have antinociceptive effects
NE
5HT (serotonin)
Opioid analgesics act in ___ and ___
PAG (periaqueductal gray)
Dorsal horn
In the dorsal horn, opioid ___ the release of pain transmitters
Inhibit.
How can you pass out from intense pain?
Intense pain will pull blood from the brain to get the blood to the site of pain.
Neuropathic pain sensations may be __ or ___ but occur without the activation of ___ by actual or potential tissue damage.
Continuous
Periodic
Nociceptors
How can neuropathic pain occur?
May result from abnormal activity in nociceptive fibers that have been damaged, but after injury has healed
Or from abnormal activity in central pain pathways (solely occurs in brain without any input signal)
True or false.. neuropathic pain has a protective function and terminates with healing.
Both statements are false.
Name 5 examples of neuropathic pain
Phantom limb
Shingles
Fibromyalgia (9 points of pain)
Diabetes neuropathies
Trigeminal neuralgia
Where do diabetes neuropathies typically occur? Why? Describe the onset of the neuropathic pain.
Typically occurs in the extremities (feet) due to clogging of the microcirculation.
First their feet go numb. Then within weeks to months, they feel pain.
Describe the relationship of shingles with neuropathic pain.
Shingles lesions may cause neuropathic pain that doesn’t go away even after the lesion has healed.
If you treat shingles early and aggressively with antivirals you may avoid this.
What is another name for trigeminal neuralgia?
Tic douloureux
True or false… neuropathic pain may be resolved by NSAIDs or opioids.
NSAIDs do not resolve pain
Opioids inconsistently may resolve pain
True or false… some antidepressants, anticonvulsants, and corticosteroids cause some reduction of neuropathic pain.
True
Name one antidepressant that is used to treat neuropathic pain
Cymbalta
Name two anticonvulsants that may be used to treat neuropathic pain
Lyrica (specifically for fibromyalgia)
Gapapentin
What is a diagnostic tool to determine if the pt is experiencing neuropathic pain?
Functional MRI