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48 Cards in this Set
- Front
- Back
specialized sensory receptor cells that are activated by noxious inputs to peripheral tissues
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nocireceptors
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inflamation causes which pain
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nocireceptor
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burning or an electric sensation
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neuropathic pain
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hypersensitivity to noxious stimuli
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hyperalgia
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hypersensititvity to an innocuous
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allodynia
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myelinated and mediate fast, sharp pain
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A
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unmyelinated and mediate slow burning and dull pain.
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C fibers
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how many months for neuropathic pain to be established as neuro
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6mo
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what opioids are for
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Analgesic /cough/ diarrhea/ acute pulmonary edema/ air hunger/ opiod overdose
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what nsaids are for
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Analgesic, Antipyretic, Anti inflammatory, Overdose-variable, Salicylates-CNS excitation,
Acetaminophen-liver toxicity |
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where are OH groiups on morphine
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3 and 6
cns depressant |
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what can codiene cause in kids?
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seizures
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codeine CH3 is where
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3
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order of strength / ease crossing BBB
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HEROIN> CODEINE> MORPHINE
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where is codeine and heroin converted to ...
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morphine in LIVER
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morphine exreted in .. how?
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KIDNEY
GLUCURONIDATION 6-glucuronyl-morphine 3 is inactive Both 3 and 6 glucuronyl-morphine forms are excreted by the kidney. |
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morphine binding site
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MU
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MU does what?
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therapeutic and adverse effects of opioids
o Analgesia, euphoria, respiratory depression, miosis, decreased GI motility, physical dependence |
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■ NE and 5-HT on spinal interneurons that inhibit transmission of pain
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descending inhibition
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pre post nocireceptors act how
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■ decrease the action potentials in nociceptive neurons reducing release of glutamate and substance P.
■ decrease the responses of the dorsal horn interneurons by activating K+ channels and hyperpolarizing the interneuron |
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3d way morphine works
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) reduced emotional reaction to pain mediated through the limbic system
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why is morphone PCA admin
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so pts cant feel IM and "get better now" always used to be ok and wotn have withdrawl
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: lacks other opioid activities “Robitussin DM” (may interact with MAOI's)
o Cough suppression: oral; depression of cough reflex centrally |
dextromethorphan
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to decrease abuse
o Antidiarrheal effect: oral; increases GI muscle tone, delays gastric emptying, reduces peristaltic activity |
diphenoxylate
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OTC, poorly absorbed, low abuse potential
o Antidiarrheal effect: oral; increases GI muscle tone, delays gastric emptying, reduces peristaltic activity |
Loperomide
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TOXICITY
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PHYS DEPENDANCE worst at 2 days past last dose
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Tolerance o Remain constipated and miotic |
respiraroty depression
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■ Must ventilate patients, sleepy |
Nausea vomiting, mess with CTZ zone activate vomit center
CNS stimulates SEIZURES on codeine and children |
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GI reduced motility and constipation. Biliary colic
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GU – increased tone in bladder sphincter, urinary retention
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. Pinpoint pupils
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miosis
eyes overdoise of opioid |
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less potent than morphine, but higher PO bioavailability.
2. Prodrug that must me metabolized to morphine 3. Primary use is antitussive. Second line analgesic, usually combined with an NSAID. |
codeine
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why is meperidine good in OB
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Shorter half life, good in OB bc doesn’t prolong labor
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meperidine is metabolized to what and where
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LIVER
to NORMEPERIDINE |
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causes what?
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in liver which has long half life and toxic can cause seizures.
Problem in renally compromised pts |
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why is meperidine abused by healthcare workers
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antimuscarinic effect, no pinpoint pupils
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meperidine has fatal reactions with what drugs
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MAOIS!!!!
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why is meperidine good for pancreatitis
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less sphincter of odi contraction
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80x more potent then morphine.
Anathesia + droperidol Spinal and epidural anathesia Available in patch for severe pain |
FENANYL
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Mixed with acetaminophen
Moderate opioid agonist |
hydrocodone
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a semisynthetic opioid derived from thebane
ORAL combined with aspirin or Tylenol As effective as morphine |
oxycodone
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how is oxycodone metabolized
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in liver
excretion in KIDNEYS |
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MU recepot agonist
Inhibits reuptake of SE and NE – pain transmission Seizures |
TRAMADOL
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mixed agonists are bettte why
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LESS RESPIRATORY DEPRESSION
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mixed agonist resistant to nalaxone
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buprenorphine
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o sublingually effective (lollipops)
o 25-50x more potent than morphine o partial agonist. o Ceiling effect on resp depression and analgesia o RESISTANT TO NALAXONE tx bc slowly comes off receptor s o Recently approved for therapy of opioid dependence. Also used for migraines (nasal spray). |
buprenirphine
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"pure" competitive opioid antagonist
o reverses acute opioid toxicity o Used IV or IM to reverse acute opioid intoxification o Complete first pass effect so not useful orally |
NALAXONE
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NALAXONE admin which wa
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IM or IV - short half life
first pass 100% |
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o Can be ORAL
o LONGER HALF LIFE – 10 hrs o Useful in smokers and addicts ? o Heroin effects blocked for 48 hrs |
NALTREXONE
antagonist |