Pain Flashcards
Nociceptive pain
When sensory nerves identify tissue damage
-visceral and somatic
Visceral pain
Injury to internal organs
Somatic pain
Injury to the skin, muscles, bones, or ligaments
Musculoskeletal
Pathophysiological pain
Damage or malfunction of the nervous system
Acetaminophen MOA
Thought to inhibit PG synthesis in CNS, resulting in decreased pain impulse generation
REMS
Risk Evaluation and Mitigation Strategy
COX1 or COX2 - which one protects gastric mucosa
COX1
_________ is an irreversible COX1 inhibitor
Aspirin
Ibuprofen max dose
OTC: 1.2g/day
Rx: 3.2g/day
Naproxen max dose
1000mg/day (BID dosing)
Highest COX2 selectivity NSAID
Celecoxib
COX2 selective NSAIDs risks
Decrease GI risk, Increase MI/stroke risk
COX2 selective NSAIDs
Celebrex Diclofenac Etodolac Meloxicam Nabumetone
Opioid MOA
Mu receptor agonists in the CNS, which primarily produce pain relief, but also euphoria and resp depression
Centrally-Acting Opioid Antagonists
Naloxone
Naltrexone
Codeine age CI
Less than 18yrs
Fentanyl patch dosing interval
q72hrs, can be q48hrs
Fentanyl pre-requirement of pt
NOT opioid-naive
-must have been using morphine 60mg/day or equivalent x7 days
Breakthrough pain dosing range
5-17% of total daily dose
Morphine 60mg/day = ______ fentanyl patch
25mcg/hr
Opioid equivalents PO
Morphine 30mg
Hydromorphone 7.5mg
Codeine 200mg
Opioid Equivalents IV/IM
Morphine 10mg
Hydromorphone 1.5mg
Codeine 130mg
Methadone dosing
If used for pain, dosed 2-3x/day
Peripherally-acting mu-opioid receptor antagonists (PAMORAs)
Blocks opioid receptors in the gut to decrease constipation w/o affecting analgesia
-methylnatrexone (Relistor)
-naloxegol (Movantik) take in AM on an empty stomach
D/C all laxatives prior to use
Mu receptor agonists and NE reuptake inhibitors
Tramadol - max 300/400mg day - inhibits reuptake of serotonin too
Tapentadol (Nucynta)
-decrease seizure threshold
Buprenorphine is a ________ mu-opioid agonist
PARTIAL
- agonist @ low doses (tx pain)
- antagonist @ high doses (tx addiction)
Buprenorphine/naloxone MOA for each
Buprenorphine suppresses withdrawal sx
Naloxone helps prevent misuse
If prescribing buprenorphine for opioid dependency, need
Data waiver. The DEA will then issue a unique number starting with “X”
How do TCAs and SNRIs work in neuropathic pain
Block NE uptake
Antispasmodics (muscle relaxants) with analgesic effects
Baclofen
Cyclobenzaprine (dry mouth)
Tizanidine (decrease BP, dry mouth)
Antispasmodics (muscle relaxants) that exert effects by sedation
Methocarbomol (decrease BP)
Carisoprodol (Soma) C-IV
Triptans MOA
Selective agonists for the 5-HT1 receptor and cause vasoconstriction by inhibiting neuropeptide release
Triptans SE
Tingling/numbness, CP/tightness, dizziness, dry mouth, drowsiness
Triptan for children
Rizatriptan
Longest half-life triptans (26hrs)
Frovatriptan
Naratriptan
To prevent med-overuse (rebound HAs)
Limit acute tx to 2-3x/week at most (10-15 days a month)
When to use prophylactic tx for migraines
If using acute tx greater than or equal to 2 days/wk, or greater than or equal to 3x/month
Uric acid crystals are an end-product of _______ metabolism
Purine
Foods to avoid for gout
Organ meats, alcohol, high-fructose corn syrup, fruit juices, shellfish, sardines
Drugs than increase uric acid
ASA (low dose)
Diuretics
Niacin
Calcineurin inhibitors
Xanthine Oxidase inhibitors
Allopurinol
Febuxostat
-use with colchicine or an NSAID for first 3-6 months
Allopurinol DI
Antacids decrease absorption
And take after a meal to decrease N
Uricosurics for gout
Inhibit uric acid resorption and increases excretion
- lesinurad (Zurampic) HAVE TO USE WITH ALLOPURINOL OR FEBUXOSTAT
- probenacid
Tumor lysis syndrome
Complication of chemo
- purines released into the blood = gout attack
- tx allopurinol