Pain Management and Analgesia accounts for 7% of the VTNE — around 14 questions. Topics include recognizing pain in animals, validated pain scoring scales, the major analgesic drug classes, multimodal strategies, and perioperative protocols. As pain assessment and treatment are increasingly the vet tech's responsibility, this domain has grown in clinical significance.
7% of the VTNE — approximately 14 questions. Allocate roughly 7% of your total study hours here to mirror the exam's weighting.
Pair each drug class with a pain scale: opioids are first-line for severe acute pain (high Glasgow score); NSAIDs for mild-to-moderate and post-op maintenance; adjuncts for chronic or neuropathic pain. Know the Feline Grimace Scale — it's the most frequently tested feline-specific scoring tool on recent exams.
Pain Assessment Scales (Feline Grimace, CBPI)
Feline Grimace Scale (FGS): five Action Units — orbital tightening, muzzle tension, ear position (flattened laterally), whisker change (stiffened and moved forward), head position (below shoulders). Score 0–2 each; total ≥ 4/10 indicates pain requiring analgesia. CBPI (Canine Brief Pain Inventory): owner-reported scale for chronic pain, assesses pain severity and interference with activities.
Recognizing Pain Signs
Acute: vocalization, guarding, hunched posture, reluctance to move, tachycardia, hypertension, dilated pupils, aggression when touched. Chronic: reduced activity, altered grooming, changes in social interaction, reduced appetite, weight loss. Prey species (rabbits, birds) mask pain — subtle behavioral changes are the main cue.
Opioids
Full mu-agonists: morphine, hydromorphone, fentanyl (highest efficacy for severe pain). Partial agonists: buprenorphine (long duration, ceiling effect — appropriate for mild-moderate pain). Agonist-antagonist: butorphanol (mild pain, sedation, short duration). Reversal: naloxone (opioid antagonist, reverses all opioid effects including analgesia — use smallest effective dose).
NSAIDs
Mechanism: inhibit cyclooxygenase (COX) enzymes → reduce prostaglandin synthesis. COX-2 selective (meloxicam, carprofen, deracoxib) preferred — spares GI-protective COX-1 prostaglandins. Contraindications: renal disease, GI ulcers, dehydration, concurrent corticosteroids (risk of GI perforation), coagulopathies. Never combine two NSAIDs. Cats: only meloxicam and robenacoxib approved — limited dosing frequency.
Multimodal Analgesia
Using multiple drugs with different mechanisms reduces total doses of each individual drug and side effects. Standard multimodal protocol: opioid (preop) + NSAID (periop or post-op) + local block (intraop) + adjunct (gabapentin for neuropathic component). Address pain at multiple points in the pain pathway for maximum efficacy.
Local Anesthetics & Nerve Blocks
Lidocaine: fast onset (1–3 min), 1–2 hr duration, appropriate for IV CRI. Bupivacaine: slow onset (5–15 min), 4–6 hr duration — never IV in cats. Mepivacaine: faster onset than bupivacaine, intermediate duration. Technique examples: splash blocks (incision site), dental blocks (infraorbital, mental, mandibular alveolar), epidural, ring blocks for digit surgeries.
Adjuncts (Gabapentin, Ketamine, Alpha-2s)
Gabapentin: modulates calcium channels, reduces neuropathic and chronic pain; used pre-operatively in anxious cats. Ketamine: NMDA antagonist; sub-anesthetic CRI prevents central sensitization intraoperatively. Alpha-2 agonists (dexmedetomidine): potent sedation + analgesia, reversible with atipamezole; causes bradycardia — monitor. Tramadol: weak mu-opioid agonist, serotonin/NE reuptake inhibitor; limited efficacy in dogs.
Perioperative Protocols
Pre-emptive analgesia: provide analgesia BEFORE the noxious stimulus (pre-op opioid or NSAID). Intraoperative: CRI ketamine ± lidocaine ± opioid, local/regional blocks. Post-op: scheduled analgesics (not PRN/"as needed") for at least 24–72 hr depending on procedure. Pain score at discharge; send home with appropriate medication.
Chronic Pain Management
Common conditions: osteoarthritis (NSAIDs long-term, gabapentin, adequan [polysulfated glycosaminoglycan]), intervertebral disk disease, cancer pain. Weight management: reduce load on arthritic joints. Rehabilitation: hydrotherapy, laser, TENS, massage. Acupuncture: adjunct for chronic musculoskeletal pain. Regular reassessment and dose adjustment.
Rehab & Physical Therapy
Hydrotherapy (underwater treadmill): reduces weight-bearing while maintaining muscle mass. Therapeutic laser (class IV): anti-inflammatory, analgesic effects. PROM (passive range of motion): maintain joint mobility in non-ambulatory patients. Sling support and assistive devices for neurologic patients. Document therapy session outcomes.
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Frequently Asked Questions
What is the Feline Grimace Scale and why is it tested on the VTNE?
The Feline Grimace Scale (FGS) is a validated pain assessment tool for cats based on five facial action units: orbital tightening, muzzle tension, ear position, whisker changes, and head position. Each is scored 0–2; a total score ≥ 4/10 suggests intervention is needed. It is tested because cats mask pain and traditional behavioral indicators are less reliable.
Why should NSAIDs not be given with corticosteroids?
Combining NSAIDs with corticosteroids dramatically increases the risk of gastrointestinal ulceration and perforation. Both drug classes independently inhibit GI-protective prostaglandins; together the effect is synergistic and potentially fatal. A washout period of at least 24–48 hours (often longer) is recommended when switching between them.
What is multimodal analgesia?
Multimodal analgesia combines analgesics with different mechanisms of action (e.g., opioid + NSAID + local anesthetic + adjunct) to address pain at multiple points in the pain pathway. This approach provides superior pain control at lower doses of each individual drug, reducing side effects and the risk of tolerance.
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