Pain & Inflammation Flashcards
1st step
Assess pain- scale of 0-10
<4/10
non-opioid meds (NSAIDs, Tylenol)
4-6/10
opioids, PO route (codeine, morphine)
> 6/10
higher potent opioids, IV route
Pain treatment: Analgesia
stops pain signal transmission @ peripheral and CNS
Peripheral level
non-opioid, NSAIDs- treatment for low-moderate pain, high efficacy for inflammation
CNS level
Acetaminophen, opioids (narcotics)
Acetaminophen
tylenol - centrally acting analgesic (not NSAID)
Acetaminophen Absorption
PO good bioavailability, peak plasma concentration after 30-60 mins
Acetaminophen Distribution
well distributed, low PPB (20%)
Acetaminophen Metabolism
active metabolite through hepatic metabolism toxic metabolite (N-acetyl benzo) is phase 2 metabolized by glutathione conjugation
Acetaminophen Excretion
renal excretion, 2-3 hrs
Opioids (morphine-like) as analgesic
are agonists, lock-key fit into receptors (mu, kappa, delta), fits into receptor decreasing release of substance p = less action potenial=less pain
Acetaminophen metabolite metabolism
phase 1 -> hydrolyze into N-acetyl-p-benzo. (hepatotoxic) -> Phase 2-> glutathione enzyme conjugation produces inactive metabolite
Mu receptor: effect, agonist, and antagonist
effect- analgesia, euphoria, low abuse potential, bradycardia, hypothermia
agonist- endorphins, morphine, synthetic opioids
antagonist- naloxone, naltrexone, nalmefene
Kappa receptor: effect, agonist, and antagonist
effect- analgesia, sedation, low abuse potential, diuresis
agonists- dynorphins
antagonist- naloxone, naltrexone, nalmefene
Delta receptor: effect, agonist, and antagonist
effect- analgesia, depression of ventilation, physical dependence, constipation
agonists- enkephalins
antagonist- naloxone, naltrexone, nalmefene
opioids meds
used for moderate to severe pain, also in general anesthesia
High efficacy opioids
mu-receptor agonists ex. fentanyl, meperidine, morphine, methadone, tramadol
Mod. efficacy opioids
hydrocodone, combination drugs