Post-operative pain in cats: buprenorphine-based vs NSAID-based analgesia — POSSIBLE

In cats after soft-tissue/orthopaedic surgery, how do buprenorphine-based and NSAID-based analgesic protocols compare for pain scores and rescue-analgesia need?

Shelf #197 · gate-verified and displayed under the developer's blinded-trial rule

POSSIBLE: The randomised feline ovariohysterectomy trials do not show an opioid-only protocol beating an NSAID-containing one. In the earliest head-to-head study, cats given meloxicam (oral or subcutaneous) had significantly lower interactive visual analogue pain scores than cats given oral buprenorphine, and no meloxicam cat needed rescue analgesia, against 3 of 10 on oral buprenorphine, 2 of 10 on subcutaneous buprenorphine and 1 of 11 saline controls. When an opioid and an NSAID were combined in all four arms (buprenorphine or butorphanol, each with carprofen or meloxicam), pain scores were low in every group with no significant differences. In the Steagall-group trial, adding meloxicam to buprenorphine numerically halved rescue need versus buprenorphine alone (13% vs 50% on the primary multidimensional scale) but the difference was not significant on that scale (P = 0.08) — it reached significance only on the second scoring system — so the honest reading is that NSAID-based or combined protocols are at least as good as buprenorphine alone, with the combination advantage suggestive rather than proven. All carded surgery is ovariohysterectomy/ovariohysterectomy in female cats; orthopaedic surgery is not represented in the carded records. Drafted Nov 10, 2026 (VetMed build, topic #197); all figures from abstracts fetched and verified at drafting.

Gassel 2005: meloxicam cats had lower pain scores than oral-buprenorphine cats and none needed rescue analgesia after ovariohysterectomy

Randomized controlled study (record's own design wording)

Who: Cats: 51 female cats (4 to 60 months old; 1.41 to 4.73 kg) undergoing ovariohysterectomy in a clinical setting, randomised to one of five preoperative treatments: oral buprenorphine 0.01 mg/kg (n = 10), subcutaneous buprenorphine 0.01 mg/kg (n = 10), subcutaneous meloxicam 0.3 mg/kg (n = 10), oral meloxicam 0.3 mg/kg (n = 10), or subcutaneous sterile saline control (n = 11), with sedation and pain behaviour scores to 20 hours after surgery.

Result: Cats receiving meloxicam orally or subcutaneously had significantly lower interactive visual analog scale (IVAS) scores (2.91 and 2.02, respectively) compared with cats receiving oral buprenorphine. Pain-associated behaviour scores for cats given buprenorphine or meloxicam by either route did not differ significantly from control-group scores. Rescue analgesia was not required by any cat receiving meloxicam, whereas 3 of 10 cats receiving oral buprenorphine, 2 of 10 receiving subcutaneous buprenorphine, and 1 of 11 control cats required rescue analgesia.

Watch out: The record does not state that pain assessors were blinded, and blinding is not claimed here. The significant IVAS contrast is specifically against oral buprenorphine; the authors' own conclusion is limited to cats receiving meloxicam appearing to have less pain than those receiving oral buprenorphine preoperatively. Single preoperative doses only.

Gassel AD, Tobias KM, Egger CM, Rohrbach BW. Comparison of oral and subcutaneous administration of buprenorphine and meloxicam for preemptive analgesia in cats undergoing ovariohysterectomy. Journal of the American Veterinary Medical Association. 2005;227(12):1937-44. PMID: 16379630. Registry ID: none in the record. MeSH: Administration, Oral · Analgesics, Non-Narcotic/administration & dosage · Analgesics, Opioid/administration & dosage · Animals · Behavior, Animal/drug effects · Buprenorphine/administration & dosage · Cats/physiology,surgery · Drug Administration Routes/veterinary · Female · Hysterotomy/methods,veterinary · Injections, Subcutaneous/veterinary · Meloxicam · Ovariectomy/methods,veterinary · Pain/prevention & control,veterinary · Postoperative Care/veterinary · Thiazines/administration & dosage · Thiazoles/administration & dosage · Time Factors · Treatment Outcome

Polson 2012: all four opioid-plus-NSAID combinations gave low pain scores with no significant differences after feline ovariohysterectomy

Blinded, randomised, prospective clinical study (record's own wording; publication types include Randomized Controlled Trial)

Who: Cats: 100 female cats undergoing routine ovariohysterectomy under midazolam-medetomidine-ketamine anaesthesia in a clinical setting, randomised to four preoperative combinations (n = 25 per group): buprenorphine 180 µg/m² with carprofen 4 mg/kg, butorphanol 6 mg/m² with carprofen, buprenorphine with meloxicam 0.3 mg/kg, or butorphanol with meloxicam; pain assessed with a simple descriptive scale, a dynamic interactive visual analogue scale (DIVAS) and mechanical nociceptive thresholds.

Result: All pain scores were low (DIVAS <10 mm, simple descriptive scale <2 and mechanical thresholds >10 N) and there were no significant differences between the groups. The authors concluded that all protocols provided adequate analgesia and, used with midazolam-medetomidine-ketamine, are effective for routine feline ovariohysterectomy.

Watch out: Every arm contained both an opioid and an NSAID, so this trial compares combinations, not buprenorphine-based versus NSAID-based protocols head-to-head — it shows the choice among these combinations did not matter on these scores, not that either class alone suffices. Medetomidine was not antagonised, which may itself contribute analgesia/sedation across all arms.

Polson S, Taylor PM, Yates D. Analgesia after feline ovariohysterectomy under midazolam-medetomidine-ketamine anaesthesia with buprenorphine or butorphanol, and carprofen or meloxicam: a prospective, randomised clinical trial. Journal of feline medicine and surgery. 2012;14(8):553-9. PMID: 22505603. Registry ID: none in the record. MeSH: Analgesics, Opioid/administration & dosage · Anesthesia, Obstetrical/veterinary · Anesthetics, Combined/administration & dosage · Animals · Behavior, Animal/drug effects · Buprenorphine/administration & dosage · Carbazoles/administration & dosage · Cat Diseases/prevention & control · Cats · Double-Blind Method · Female · Humans · Hysterectomy/veterinary · Meloxicam · Ovariectomy/veterinary · Postoperative Pain/prevention & control,veterinary · Postoperative Care/veterinary · Pregnancy · Premedication · Prenatal Exposure Delayed Effects/veterinary · Prospective Studies · Thiazines/administration & dosage · Thiazoles/administration & dosage · Time Factors · Treatment Outcome

Steagall 2018: rescue need was 50% on buprenorphine alone vs 13% on meloxicam-buprenorphine — not significant on the primary pain scale (P = 0.08)

Randomized, controlled, blinded study (record's own wording)

Who: Cats: 52 adult cats undergoing ovariohysterectomy in a clinical setting, randomised to gabapentin-buprenorphine (n = 19; gabapentin 50 mg orally plus buprenorphine 0.02 mg/kg intramuscularly), meloxicam-buprenorphine (n = 15; meloxicam 0.2 mg/kg subcutaneously plus buprenorphine and placebo capsules), or buprenorphine alone (n = 18; buprenorphine plus placebo capsules), under acepromazine-buprenorphine-propofol-isoflurane anaesthesia, with postoperative pain evaluated to 8 hours using a multidimensional composite pain scale (MCPS) and the Glasgow feline scale (rCMPS-F); rescue analgesia (buprenorphine and/or meloxicam) was given if MCPS was 6 or more.

Result: The prevalence of rescue analgesia on the MCPS was not significantly different between groups (P = 0.08; gabapentin-buprenorphine 5 of 19 [26%], meloxicam-buprenorphine 2 of 15 [13%], buprenorphine alone 9 of 18 [50%]), but it would have been significantly higher in the buprenorphine-alone group (14 of 18 [78%]) than in the gabapentin-buprenorphine (P = 0.003; 5 of 19 [26%]) and meloxicam-buprenorphine (P = 0.005; 4 of 15 [27%]) groups if intervention had been based on the rCMPS-F. Pain and sedation scores were not different among treatments, and the two scoring systems correlated strongly (P <0.0001).

Watch out: This is the Steagall-programme record the draft anchor pointed to. The headline comparison depends on which validated scale triggers rescue: null on the pre-specified MCPS, significant on the rCMPS-F — the authors themselves raise a potential type II error with the MCPS due to small sample size. The meloxicam arm is a combination (meloxicam plus buprenorphine), not an NSAID-only protocol.

Steagall PV, Benito J, Monteiro BP, Doodnaught GM, Beauchamp G, Evangelista MC. Analgesic effects of gabapentin and buprenorphine in cats undergoing ovariohysterectomy using two pain-scoring systems: a randomized clinical trial. Journal of feline medicine and surgery. 2018;20(8):741-748. PMID: 28920534. Registry ID: none in the record. MeSH: Analgesics, Opioid/administration & dosage · Animals · Buprenorphine/administration & dosage · Cat Diseases/drug therapy,surgery · Cats · Gabapentin/administration & dosage · Hysterectomy/adverse effects,veterinary · Ovariectomy/adverse effects,veterinary · Pain Management/veterinary · Pain Measurement/veterinary · Postoperative Pain/drug therapy,veterinary · Random Allocation

Synthesis: NSAID-based and combined protocols match or beat buprenorphine alone on pain scores and rescue need; no trial shows an opioid-only advantage

Synthesis

Who: Synthesis of the cards above: Gassel 2005 (51 female cats, randomised, five arms including saline control), Polson 2012 (100 female cats, blinded randomised, four opioid-plus-NSAID combinations) and Steagall 2018 (52 adult cats, randomised controlled blinded, buprenorphine alone vs meloxicam-buprenorphine vs gabapentin-buprenorphine) — all ovariohysterectomy/ovariohysterectomy in clinical settings.

Result: (1) Head-to-head, meloxicam produced lower interactive pain scores than oral buprenorphine and zero rescue use versus 20–30% with buprenorphine (Gassel). (2) Adding an NSAID to buprenorphine numerically reduced rescue need from 50% to 13%, significant on one validated scale but not the other (Steagall). (3) When every cat received an opioid plus an NSAID, the specific pairing made no detectable difference and all scores were low (Polson). The consistent direction favours including an NSAID; the size of any added benefit over buprenorphine alone is not precisely established.

Watch out: All carded evidence is soft-tissue surgery (ovariohysterectomy) in female cats under differing anaesthetic protocols; there is no carded orthopaedic-surgery trial, and results should not be silently transported to orthopaedic pain, male cats, or other NSAIDs and doses than those carded.

Synthesis of Gassel AD et al. PMID: 16379630; Polson S et al. PMID: 22505603; Steagall PV et al. PMID: 28920534. Registry IDs as on the individual cards.

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