Flashcards in Exam #01h - Neuropathic and other difficult Pain Deck (14):
Which pain type is defined as pain arising as a consequence of a lesion or disease affecting the somatosensory system with indefinable damage to neurons?
Give an example of neuropathic pain?
phantom limb pain
True or False - Regarding neuropathic pain, the pain signal is maintained ectopically by dysfunction in the activity of tissue nociceptors and/or by abnormal pain signaling in the CNS?
True - pain can persist even after stimulus is gone
With regards to peripheral sensitization, increases in excitability of peripheral nociceptors DECREASES OR AMPLIFIES pain signals to the CNS?
With regards to central sensitization, increases in the excitability of pain-transmitting neurons within the CNS result in normal inputs producing MUTED/EXAGGERATED responses?
Name (7) different difficult pains to treat?
5. sickle cell
6. phantom limb
What are the first line agents to treat difficult pain. If neither of these 2 agents work, what is tried next?
first line are NSAIDs or APAP
if those don't work, try opioids
List the (4) extreme sensations that characterize neuropathic pain?
1. burning (like a blow torch)
3. extreme cold
4. numbness and tingling
Which nerve fiber, that responds to light touch/pressure, is particular to neuropathic pain?
A-beta nerve fiber
How would A-beta fiber that responds to light touch/pressure be involved in neuropathic pain?
A-beta fibers are in close proximity to C-fibers (the afferent neurons that transmit slow pain to CNS) and, after damage, A-beta fibers could synapse with C-fibers so the lightest touch on your body could be perceived as painful
What was the first FDA approved drug for Tx of fibromyalgia (brand and generic)
Explain the MOA of Gabapentin and Pregabalin?
They bind to subunits of voltage-gated Ca2+ channels and inhibit excitatory NT release
What are (7) common AE associated with Gabapentin and Pregabalin?
3. dry mouth
5. blurred vision
6. weight gain
7. difficulty concentrating