B. Analgesics Flashcards
Pain
- unpleasant sensory or emotional experience related to tissue injury - whatever the experiencing person says it is and when - fifth vital sign
Pain experience
- Perception of pain - ind. subjective 2. Pain threshold- intensity at which stimuli is judged as painful 3. Pain tolerance- max degree of pain intensity a person is will get to endure - variable
Addiction vs. physical dependence
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Types of pain- duration
- acute - sudden -chronic - persistent ( not cancer)
Types of pain - origin
- somatic ( superficial, visceral , vascular) - cancer - referred - phantom - neuropathic ( injury to peripheral nerve fibers)
In tissue injury , body releases these substances that stimulate nerve endings
- bradykinin - histamine - potassium - prostaglandins - serotonin
Endorphins and enkephalins
Produced by the body - considered the body’s painkillers “ runners high”
Analgesics - non opioid
- acetaminophen - NSAIDS- aspirin, ibuprofen,naproxen
Opioid analgesics
- morphine, hydromorphone, fentanyl - codeine, hydrocodone, oxycodone
Nonopioid analgesics use and effects
- use for mild to moderate pain - antipyretic ( acetaminophen and NSAIDS) - anti- platelet (aspirin primarily) - anti- inflammatory ( NSAIDS only )
Acetaminophen ( Tylenol)
- analgesic & antipyretic effects - no anti- inflammatory , no anti- platelet - less bleeding - less SE than opioid, avoid respiration depression
Acetaminophen ( Tylenol) Indc/contraindications
Indications : mild to moderate pain , fever Contraindications: known drug allergy, severe liver disease, genetic disease ( G6PD- enzyme deficiency)
Acetaminophen ( Tylenol) SE/AE
- generally well tolerated - may experience: rash, nausea & vomiting - less common: blood disorders ( anemia ) , ✨hepatic and nephroticities- esp. taken outside normal ranges ( + alcohol)
Acetaminophen ( Tylenol) Toxicities/ management
-potentially lethal when overdosed (150 mg/kg+ at a time ) -✨hepatic necrosis- most serious - long term ingestion of high doses cause nephrotoxicity
Treatment for Acetaminophen ( Tylenol) toxicity
Acetylcysteine