Exam 1 - Orthopedics and Pain Mgmt. Flashcards
(137 cards)
Sharp, dull, aching, throbbing…
Nociceptive Pain
Burning, tingling, shooting
Neuropathic Pain
What organ FXC is important to check before administering pain meds?
Liver and Renal FXC
Make sure they’re clearing drug apropriately
WHO Ladder Approach
Step 1 - Nonopioids (Acetaminophen and NSAIDs)
Step 2 - Opioids for mild to moderate pain
Step 3 - Opioid for moderate to severe pain
Where do drugs treat pain?
Inflammation of tissue
CNS
What drug prevents transmission of pain signal from periphery to CNS?
Lidocaine
COX1
Constituitive enzyme; produces gastric barrier to prevent ulcers from forming.
COX2
Inducible, upregulated when injury occurs.
*main focus
What drugs should you start with when you have somatic/visceral pain?
Start with NSAIDs, APAP, or corticosteroids +/- opioids.
What drugs should you use for neuropathic pain?
Opioids are useful, but not as helpful as they would be in broken bone, etc.
Use antidepressants, anticonvulsants, and baclofen.
Acetaminophen (Tylenol)
Good analgesic and antipyretic.
Poor anti inflammatory, does not work out in periphery. Has anticoagulant effects.
1st line: osteoarthritis and back pain.
Can be mixed with opioids for synergistic effects.
What is the IV form of acetaminophen?
Ofirmev
Good to use when patient can’t tolerate oral or rectal acetaminophen.
Ex: Neutropenic HemOnc patients.
“Opioid sparing drug” - lets you use less opioids. Less side effects, so can recover quicker post-op with this than an opioid.
Why don’t you give rectal drugs to neutropenic patients?
You might perforate their rectum and cause septicemia..
What do you worry about with overuse of Acetaminophen (Tylenol)?
Hepatic injury
Limit to 4g of Tylenol per day for normal patient.
Lower threshold for cirrhosis (3g/day).
Make sure you take into account all sources of acetaminophen.
NSAIDs
Work at site of inflammation by inhibiting synthesis of COX1 and COX2 to decrease prostaglandin synthesis.
How does asthma happen from NSAIDs?
NORMAL: Inflammation has membrane phospholipids that go to arachodonic acid to go to COX to produce prostaglandins, prostacyclin, and thromboxanes.
NSAIDs: When you shut down this pathway, it shift towards leukotriene pathway = potent bronchoconstrictors, and can cause drug-induced asthma.
What NSAID is given rectally?
Aspirin
How long is NSAID response?
Give drug 2-3 weeks to assess patient’s response before trying a new drug.
NSAID Side Effects (5 listed)
Gastric or intestinal ulceration from inhibiting COX1 (gastric barrier), which decreases production of mucus barrier.
Decrease PLT aggregation; bleeding risk.
Hypersensitivity, Asthma (bronchospasm)
Pregnancy - can delay spontaneous labor in third trimester. Can have adverse fetal effects.
Possible increase in liver enzymes and decrease in renal function (it inhibits PG from keeping afferent arteriole open which leads to decrease in renal function).
How do NSAIDs impact the fetus during pregnancy?
Ductus arteriosus between two atria in the heart are open in fetus and allows for blood flow to mix between two.
PGs keep DA open, but when you give an NSAID, you inhibit PG and the DA can close early. If it closes early, blood may not circulate as well.
If a baby is born with patent DA, what can you use to treat them?
If you had a baby when the DA didn’t close, you can give NSAIDs (IV ibuprofen and IV indomethicin) to close it.
Acetylsalicylic acid (Aspirin)
Irreversible inhibitor; lasts for lifetime of PLT. Bleeding risk.
Nonselective for COX1 and COX2
If a baby has a congenital malformation and you want DA open for longer, what can you give?
IV prostaglandin
Alprostadyl drip to keep it open, while they dx the heart.
Aspirin Dosage
Used for heart protection, fever, etc. Can come in powders - pts don’t view this as a drug so its easy for them to overdo it.