Desflurane

Desflurane is a halogenated volatile inhalant anesthetic with a chemical structure nearly identical to isoflurane, differing only by the substitution of a fluorine atom for chlorine at the alpha-ethyl carbon. **Key Clinical Features:** * **Extremely Rapid Kinetics:** Its very low blood/gas partition coefficient (0.42) allows for exceptionally fast induction and recovery times compared to other inhalants. * **Specialized Equipment Required:** Because its boiling point (22-23°C) is near room temperature, desflurane requires a specific, electrically heated, and pressurized vaporizer, which can be expensive. * **Airway Irritant:** Unlike sevoflurane, desflurane has a pungent odor and is a respiratory irritant, making it poorly suited for mask inductions (can cause breath-holding, salivation, and laryngospasm). * **Minimal Metabolism:** It is highly resistant to biodegradation (only 0.02% metabolized), minimizing the risk of hepatotoxicity or nephrotoxicity.

กลไกการออกฤทธิ์: While the exact mechanism of inhalant anesthetics remains incompletely understood, desflurane is believed to produce general anesthesia by interacting with the **lipid matrix of neuronal membranes** and modulating multiple ligand-gated ion channels in the central nervous system. **Mechanistic Pathways:** * **GABA_A and Glycine Receptors:** Potentiates inhibitory neurotransmission → CNS depression. * **NMDA Receptors:** Inhibits excitatory glutamatergic transmission. **Minimum Alveolar Concentration (MAC) in Oxygen:** * Dogs: 7% * Cats: 9.8% * Horses: 7.23% * Rabbits: 8.9% * Alpacas/Llamas: 7.8-8.0% *Note: Desflurane causes dose-dependent cardiovascular (hypotension) and respiratory depression, but does not sensitize the myocardium to catecholamine-induced arrhythmias.*

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