Anesthesia Recommendations for the Brachycephalic Dog

1. Pre-Operative Management

A. Patient Assessment and Workup

1. Thorough History and Physical Exam
• Evaluate for exercise intolerance, heat intolerance, regurgitation/vomiting, respiratory changes, collapse episodes, and any known comorbidities (e.g., cardiac disease, GI disease).
• Check for previous anesthetic episodes and complications.
• Assess body condition: obesity can worsen airway issues.

2. Diagnostic Testing
• Blood work (CBC, chemistry), urinalysis, and ideally three-view thoracic radiographs for patients over two years of age or those showing respiratory or cardiac signs.
• Cardiac evaluation if indicated (e.g., murmurs, arrhythmias, breed predispositions).

3. GI Support
• Brachycephalic patients commonly have gastroesophageal reflux and/or esophagitis.
• Proton pump inhibitors (e.g., omeprazole) and antiemetics (e.g., maropitant) are recommended before anesthesia and often for a few days after.
• Consider prokinetics in patients with known regurgitation or hiatal hernia.

4. Fasting Protocol
• Long fasting (6–12 hours) is traditional, yet it may increase gastroesophageal reflux.
• Some studies suggest a small meal 3–6 hours pre-op can reduce reflux.
• No universal guidelines specifically for brachycephalic breeds, so use clinical judgment.

5. Stress Reduction
• High stress exacerbates respiratory compromise.
• Consider oral sedatives/anxiolytics (e.g., gabapentin, trazodone) the morning of surgery to minimize stress in the clinic.

6. Steroids Debate
• Low-dose corticosteroids might help reduce airway inflammation (especially if upper airway surgery is planned), but they preclude the use of nonsteroidal anti-inflammatories and have limited evidence.
• If used, weigh the risks (e.g., GI irritation) vs. benefits (reduced airway swelling).

2. Intraoperative Management

A. Preparation

1. Equipment Readiness
• Multiple endotracheal tube sizes (smaller and larger than estimated).
• Laryngoscope with adequate blade length and a bright light.
• Suction ready (especially for potential regurgitation).
• Tracheostomy kit available in case intubation is impossible.

2. Induction Technique
• Pre-oxygenate the patient in sternal recumbency (head elevated) before induction.
• Consider applying lidocaine to the arytenoids or giving a small IV bolus of lidocaine (1–1.5 mg/kg) to reduce coughing and laryngospasm.
• Gentle, controlled induction:
• Propofol or alfaxalone given slowly can minimize apnea and cardiovascular depression.
• Ketamine with a benzodiazepine is an option if no contraindication (e.g., significant cardiac disease).
• Once intubated, quickly inflate the cuff and confirm no leaks to reduce aspiration risk.
• Eye lubrication immediately after induction (and throughout the procedure).

B. Anesthetic Drug Choices

1. Premedications
• Opioids (pure mu or partial agonists) for analgesia, but be wary of panting, sedation, and potential vomiting.
• Methadone has fewer GI side effects but may be expensive or less available.
• Buprenorphine is milder but longer-acting.
• Pair with antiemetics to reduce vomiting risk.
• Alpha-2 agonists (dexmedetomidine) at low doses can provide sedation and some analgesia but can cause profound sedation, bradycardia, and possible airway obstruction if over-sedated. Keep reversals ready.
• Benzodiazepines (midazolam, diazepam) are reversible with minimal cardiovascular depression but risk excessive muscle relaxation (potentially worsening airway obstruction) or paradoxical excitation.
• Acepromazine is an option at low doses for sedation and MAC reduction with minimal respiratory impact but no analgesia.
• Anticholinergics are used less frequently as a premed due to tachycardia and decreased GI motility, but keep them on hand in case of vagal events.

2. Maintenance and Monitoring
• Inhalant anesthesia (iso or sevo) with vigilant monitoring.
• Ventilatory support may be necessary; monitor end-tidal CO₂ (target 35–45 mmHg) and SpO₂ (>95%).
• Blood pressure monitoring is critical, though it may be challenging with thick limbs; aim for mean arterial pressure ≥ 70 mmHg (systolic ≥ 100 mmHg).
• ECG to detect potential arrhythmias (bulldogs, boxers at risk).
• Temperature regulation: keep the patient from overheating or becoming hypothermic.

3. Analgesia
• Use multimodal strategies:
• Local/regional blocks to reduce systemic drug requirements.
• Ketamine CRI, lidocaine CRI, or dexmedetomidine CRI in very low doses for balanced analgesia and MAC reduction.
• NSAIDs with caution if no GI contraindication and if the patient is hemodynamically stable.

4. Ocular Protection
• Apply lubricant every 20–30 minutes; brachycephalics often have prominent globes at risk for corneal ulcers or dryness.

3. Post-Operative Management

A. Extubation and Airway Vigilance

1. Prolonged Intubation
• Keep the endotracheal tube in place until the patient is actively swallowing and rejecting the tube. Brachycephalics often need more time to protect their airway.

2. Positioning
• Recover in sternal recumbency, with head elevated but nose tilted slightly downward so fluid drains away from the airway.

3. Monitoring
• Dedicated staff to watch for airway obstruction, cyanosis, or respiratory distress.
• SpO₂ monitoring; consider supplemental oxygen (e.g., via flow-by or nasal cannula).

4. Possible Complications
• Be ready to re-intubate quickly if needed. Have fresh ET tubes, a functioning laryngoscope, and induction drugs ready.
• Consider low-dose steroids if signs of airway swelling.
• Have an emergency tracheostomy kit available if severe obstruction occurs.

B. Pain & Sedation

1. Post-Op Analgesia
• Continue opioids or switch to other analgesics if indicated.
• NSAIDs if no contraindications and patient remains stable hemodynamically and gastrointestinely.

2. Managing Anxiety or Panting
• Panting can be due to opioids, pain, or stress. Low doses of a sedative (e.g., acepromazine) or partial opioid reversals (e.g., small dose of butorphanol if a full mu was used) can help.
• Keep the environment quiet and calm to reduce stress and hyperventilation.

C. Client Communication

• Discuss risk of airway obstruction, need for re-intubation or tracheostomy, and potential for unplanned interventions in recovery.

• Emphasize that close monitoring is critical for a safe outcome and that sedation or intubation may be extended if airway swelling or obstruction occurs.

• Reinforce ongoing home GI protectants and any required follow-up for airway surgery if needed.

Key Takeaways

• Preparation and Vigilance are critical at every stage (pre-op, intra-op, and post-op).

• Multimodal Analgesia and individualized drug selection minimize cardiorespiratory compromise.

• Airway Protection is paramount: avoid over-sedation, maintain intubation as long as possible, and be ready for emergencies.

• GI Prophylaxis is important given brachycephalics’ propensity for reflux and aspiration.

• Calm, monitored recovery with sternal positioning, slow extubation, and readiness for intervention is essential.