Multimodal analgesia plan for bilateral TPLO in a 4yo Lab...

Excellent question. A robust, multimodal plan is critical for a bilateral TPLO, as the surgical insult and potential for post-operative pain are significant. My approach is phased, starting before the patient even enters the OR.

Here is the protocol I use for these cases:

1. Pre-Anesthetic/Pre-emptive Analgesia:
* Opioid: Methadone (0.3-0.5 mg/kg IM) or hydromorphone (0.1 mg/kg IM) given with the premedication. This provides initial sedation and strong mu-agonist analgesia.
* Adjunct: Gabapentin (10 mg/kg PO) given 1-2 hours prior to induction. This helps to prevent central sensitization.
* NSAID: I give carprofen (4.4 mg/kg SQ) at induction, provided the patient is normotensive and has no contraindications. This ensures anti-inflammatory effects are on board as soon as inflammation begins.

2. Intra-operative Analgesia:
* CRI: My preference is a Fentanyl-Lidocaine-Ketamine (FLK) CRI.
* Fentanyl: 2-5 mcg/kg/hr for potent, titratable analgesia.
* Lidocaine (dogs only): 25-50 mcg/kg/min for systemic analgesia and anti-inflammatory effects.
* Ketamine: 2-5 mcg/kg/min to antagonize NMDA receptors and prevent wind-up.
* Regional Block: A femoral and sciatic nerve block for each limb using bupivacaine (total dose not to exceed 2 mg/kg) is the gold standard. If you're not comfortable with nerve locator-guided blocks, a generous incisional and intra-articular line block with bupivacaine is still highly effective.

3. Post-operative Hospital Care (First 24-48h):
* Continue the FLK CRI for 12-24 hours post-op, then transition to injectable methadone (0.2-0.3 mg/kg IV q4-6h) as needed based on pain scoring.
* Continue carprofen (2.2 mg/kg PO q12h) once the patient is eating.
* Continue gabapentin (5-10 mg/kg PO TID).
* Cryotherapy (ice packs) applied to both stifles for 15 minutes every 4-6 hours is crucial for reducing inflammation and pain.

4. At-Home Analgesia (10-14 days):
* Cornerstone NSAID: Carprofen at 2.2 mg/kg PO q12h. An effective NSAID is the most important component of the at-home plan. Studies have shown that NSAIDs provide superior analgesia compared to tramadol alone for post-TPLO pain (Piras et al., 2021).
* Adjunct: Gabapentin at 5-10 mg/kg PO BID-TID.
* Breakthrough Pain: Tramadol at 2-5 mg/kg PO q8-12h can be used as an adjunct, but I counsel owners that its efficacy is variable in dogs and it should not be relied upon as the sole agent.
* Non-pharmacologic: Strict confinement is non-negotiable and is a form of pain management. Adjunctive therapies like low-level laser therapy may also be beneficial for managing inflammation and promoting healing (Moore, 2025).

This layered approach targets the pain pathway at multiple points, providing more effective and consistent analgesia than any single agent could achieve.

Colleague, a solid, multi-layered plan is critical for a bilateral procedure. The goal is to preemptively block pain pathways at multiple levels to reduce central sensitization and improve recovery. My focus will be on the systemic pharmacology.

Here is my recommended approach, assuming the patient is a healthy 4-year-old Lab with normal preoperative renal and hepatic function.

1. Peri-Operative Protocol:
* Pre-medication: I recommend methadone (0.3-0.5 mg/kg IM) for its dual mu-agonist and NMDA-antagonist properties, which helps prevent wind-up. Combine with a sedative like dexmedetomidine, dosed to effect.
* Pre-emptive NSAID: Administer carprofen (4.4 mg/kg SQ) pre-operatively, provided the patient is normotensive. Getting ahead of the inflammatory cascade is key.
* Intra-operative CRI: An FLK (Fentanyl-Lidocaine-Ketamine) infusion is my strong preference. This combination targets opioid receptors, sodium channels, and NMDA receptors simultaneously, reducing inhalant requirements and providing superior, stable analgesia.
* Loading Doses: Fentanyl (2-4 mcg/kg IV), Lidocaine (1 mg/kg IV), Ketamine (0.5 mg/kg IV).
* CRI Rates: Fentanyl (2-10 mcg/kg/hr), Lidocaine (1-2 mg/kg/hr), Ketamine (0.3-0.6 mg/kg/hr).
* Regional Block: Dr. Okafor will cover the technique, but from a pharmacologic standpoint, an epidural or bilateral femoral/sciatic nerve block is non-negotiable. It's the most effective way to reduce the systemic drug load and associated side effects.

2. Immediate Post-Operative (In-Hospital):
* Transition: Continue the FLK drip for 4-6 hours post-extubation, then transition to scheduled injectable opioids. Methadone (0.2-0.3 mg/kg IV q4-6h) is an excellent choice to maintain that NMDA antagonism.
* NSAID: Continue carprofen (2.2 mg/kg PO BID).
* Adjuncts: Begin loading gabapentin (10 mg/kg PO TID) immediately post-op to manage potential neuropathic pain and blunt maladaptive pain signaling. Add trazodone (3-5 mg/kg PO q8-12h PRN) for sedation to ensure strict rest.

3. Discharge Medications (10-14 day plan):
* NSAID: Carprofen (2.2 mg/kg PO BID).
* Gabapentin: 10-15 mg/kg PO TID. Taper off after 2-3 weeks.
* Tramadol: 3-5 mg/kg PO TID. Be aware that tramadol's efficacy is highly variable in dogs due to inconsistent metabolism to its active M1 metabolite. Its primary benefit may be from serotonin/norepinephrine reuptake inhibition. It's a reasonable part of a multimodal plan, but don't rely on it as your sole opioid-like analgesic.
* Trazodone: 3-5 mg/kg PO q8-12h as needed to enforce crate rest, which is paramount for a bilateral case.

A final point: I would not add a gastroprotectant like omeprazole unless there is a specific indication (e.g., history of GI ulceration, concurrent steroid use). Routine prophylactic use with NSAIDs in healthy dogs is not supported by current evidence.

Let me know if this patient is on any concurrent medications so I can run an interaction check.