CCAT Pain Management and Pharmacology 4 — Questions and Answers
Question 1: In the gate control theory of pain, activation of large-diameter Aβ fibers is proposed to reduce pain by:
- Increasing the release of substance P in the dorsal horn
- Inhibiting transmission from small C-fibers at the spinal cord level (Correct answer)
- Directly suppressing opioid receptors in the brainstem
- Activating NMDA receptors in the thalamus
Correct answer: Inhibiting transmission from small C-fibers at the spinal cord level
Aβ fiber activation stimulates inhibitory interneurons in the dorsal horn that 'close the gate' to nociceptive input from C- and Aδ-fibers.
Question 2: Transdermal fentanyl patches in dogs differ from cats primarily in that dogs:
- Absorb fentanyl more slowly and achieve lower peak plasma concentrations
- Metabolize fentanyl faster and may need higher patch concentrations (Correct answer)
- Cannot use fentanyl patches due to skin thickness
- Require occlusive dressings to achieve adequate absorption
Correct answer: Metabolize fentanyl faster and may need higher patch concentrations
Dogs generally metabolize fentanyl faster than cats and may require larger patch sizes or more frequent changes to maintain therapeutic plasma levels.
Question 3: Which pain assessment tool is specifically validated for post-operative pain in dogs and uses behavioral and physiological indicators?
- Glasgow Composite Measure Pain Scale (GCMPS) (Correct answer)
- Numeric Rating Scale (NRS)
- Feline Grimace Scale (FGS)
- Visual Analog Scale (VAS)
Correct answer: Glasgow Composite Measure Pain Scale (GCMPS)
The Glasgow Composite Measure Pain Scale (GCMPS) is a validated multidimensional tool for assessing acute post-operative pain specifically in dogs.
Question 4: A rehabilitation patient is receiving maropitant (Cerenia) concurrently with opioids. The analgesic benefit of maropitant is related to its:
- Mu-opioid receptor potentiation
- Neurokinin-1 (NK-1) receptor antagonism (Correct answer)
- COX-2 inhibition at the spinal cord
- Alpha-2 adrenergic agonist properties
Correct answer: Neurokinin-1 (NK-1) receptor antagonism
Maropitant blocks NK-1 receptors, which are activated by substance P, providing visceral analgesia in addition to its primary antiemetic effect.
Question 5: Neuropathic pain in companion animals is BEST characterized by:
- Acute onset directly proportional to tissue damage severity
- Hypersensitivity and pain outlasting the original injury (Correct answer)
- Absence of inflammatory mediators at the injury site
- Exclusive response to opioid therapy
Correct answer: Hypersensitivity and pain outlasting the original injury
Neuropathic pain involves altered nervous system processing, leading to hypersensitivity (allodynia, hyperalgesia) that persists beyond the expected healing period.
Question 6: Which statement about buprenorphine is CORRECT in the context of veterinary rehabilitation?
- It is a full mu agonist with no ceiling effect on analgesia
- It is a partial mu agonist with a ceiling effect on analgesia (Correct answer)
- It blocks both mu and kappa receptors equally
- It produces analgesia exclusively via kappa receptor agonism
Correct answer: It is a partial mu agonist with a ceiling effect on analgesia
Buprenorphine is a partial mu-opioid agonist with high receptor affinity and a ceiling effect, making dose escalation beyond a threshold ineffective.
Question 7: During laser therapy for pain management, which wavelength range is considered optimal for tissue penetration and analgesic effect in companion animals?
- 200–400 nm (UV range)
- 400–600 nm (visible blue-green)
- 600–1100 nm (red to near-infrared) (Correct answer)
- 1200–1500 nm (mid-infrared)
Correct answer: 600–1100 nm (red to near-infrared)
Red to near-infrared wavelengths (600–1100 nm) penetrate tissues most effectively and are used in photobiomodulation for pain relief and tissue healing.
CCAT Pain Management and Pharmacology 4
In the gate control theory of pain, activation of large-diameter Aβ fibers is proposed to reduce pain by: