Week 2 Flashcards
(154 cards)
What are the characteristics of nociceptive pain?
• Noxious peripheral stimulus affects a structure
- Mechanical, chemical irritant, heat, cold
• Somatic versus visceral
- Somatic: injury to bone, skin, etc.
- Visceral: compression/ distension of internal organs (pancreatitis, cancer pain, etc)
What are the characteristics of neuropathic pain?
- More often chronic versus acute
* Damage to the peripheral or central nervous system
What are the ways to assess pain intensity?
- Word scale (none to excruciating)
- Visual Analogue Scale (0 – no pain; 10 = worst possible)
- Wong-Baker FACES Pain Scale
What are the descriptive terms used for pain?
“Throbbing, aching, cramping” – nociceptive pain
• “Burning, tingling, stabbing, shocking” – neuropathic pain
What is Acetaminophen (Tylenol) used for?
- Used in mild/moderate pain when used alone
- Used for moderate/severe pain when paired with opioids. Ex: oxycodone and acetaminophen (Percocet®)
- Commonly used to reduce fever
What are the characteristics of Acetaminophen (Tylenol)?
• Mild adverse effect profile
• Liver toxicity at high doses
- Commonly seen as a tool for suicide attempts
• Available for oral and intravenous administration
What are the types of NSAIDS (Non-steroidal, anti-inflammatory drugs)?
Aspirin, Cox-1, Cox-2 inhibitors
What do prostaglandins lead to?
Lead to inflammation and pain when injury occurs
What is the function of a cyclooxygenases(COX)?
Convert arachidonic acid to
prostaglandins
What is the function of an NSAID?
Inhibit COX enzymes and block pro-inflammatory prostaglandins
What does Cox-1 do?
Helps to protect the stomach lining via prostaglandins
What does a more COX-2 selective drugs lead to?
Leads to less stomach upset and bleeding
What does a more COX-2 selective drugs do?
Shifts the balance of platelet activity to favor increased clotting by inhibiting prostacyclin (promotes vasodilation and prevents platelet occlusion in carotid arteries), while continuing to allow thromboxane (promotes platelet aggregation) production.
What kind of risk is associated with a COX-2 selective drug?
Cardiac Risk
What are the actions of a NSAID?
- Analgesic
- Anti-inflammatory
- Anti-pyretic
- Anticoagulant
What are the side effects of a NSAID?
- Drowsiness
- Dizziness
- Blurred vision
- Bleeding
- Anemia
- Dermatologic rash
- Renal toxicity
- Hyperkalemia
- Cardiovascular Events: e.g. heart attack and/or stroke
- Gastrointestinal Events: e.g. GI irritation, inflammation, ulceration bleeding
What are the risk factors for increased risk of GI
bleed with the use of NSAIDs?
- Advanced Age
- Multiple NSAIDS
- High Dose of NSAIDS
- History of Ulcers
- Alcoholism
- Use of Other Agents (anticoags, steroids, etc.)
What is an opiod?
Endogenous and exogenous substances that act on opioid receptors
What are the 4 steps to nociceptive pain?
- Stimulation
- Transmission
- Perception
- Modulation
What is the feature of the 1st step to nociceptive pain?
Stimulate the nociceptors
What is the feature of the 2nd step to nociceptive pain?
- Afferent fibers transmit signals to the “dorsal horn” of the spinal cord
- Signal then travels to the cortex via the thalamus
What is the feature of the 3rd step to nociceptive pain?
- Information reaches the somatosensory cortex
* Pain is “felt.” Pain perception
What is the feature of the 4th step to nociceptive pain?
Pain can be tolerated or reduced by endogenous opiates
What type of receptor do endogenous opioid: endorphins have?
Mu (µ)