Timing-Controlled Concept for Extubation in Brachycephalic Dogs: α2–Bridged On-Demand Extubation

Shotaro Nagahama^1,2*

• ¹JAVA Incorporated Association, Tokyo, Japan
• ²Gifu Daigaku, Gifu, Japan

Brachycephalic dogs are overrepresented among peri-and post-anesthetic respiratory complications, and many serious adverse events in small animals cluster around extubation and early recovery. A recurring clinical problem is a mismatch between apparent behavioral emergence and incomplete recovery of upper-airway stability, such that extubation may occur while residual anesthetic effect still depresses pharyngeal dilator activity and protective reflexes. Brachycephalic dogs have anatomically constrained, load-sensitive upper airways, making emergence a phase in which behavioral arousal may precede full recovery of airway stability. We propose a timing-controlled concept for extubation in brachycephalic dogs—α2–Bridged On-Demand Extubation (A2-ODE)— that decouples volatile washout from the timing of awakening and extubation. In A2-ODE, the vaporizer is turned off and washout is completed, as far as practicable, while the airway remains secured under a low-to moderate-dose α2-agonist sedative bridge; awakening is then intentionally triggered by atipamezole immediately before planned extubation. The sequence is designed to avoid extubation within a volatile-associated vulnerable emergence range, stabilize the emergence phenotype, and provide clinician-controlled timing of wakefulness and extubation. We outline a stepwise protocol, discuss key prerequisites, limitations and hemodynamic considerations, and propose testable predictions for prospective clinical and physiologic studies in brachycephalic patients. This is a conceptual, hypothesis-generating article; A2-ODE is intended as a framework for future clinical studies rather than a validated protocol for routine use.