## Desflurane: Properties and Clinical Characteristics **Key Point:** Desflurane is a volatile halogenated anesthetic with unique physicochemical properties that make it unsuitable for inhalational induction but excellent for rapid emergence. ### Desflurane vs. Other Volatile Agents: Comparative Profile | Property | Desflurane | Isoflurane | Sevoflurane | Halothane | |----------|-----------|-----------|------------|----------| | MAC (%) | 6.0 | 1.15 | 2.0 | 0.75 | | Odor | Pungent | Pungent | Non-pungent | Sweet | | Airway irritation | Severe | Moderate | Minimal | Minimal | | Suitable for inhalational induction | No | No | Yes | Yes | | Emergence time | Rapid | Intermediate | Rapid | Slow | | Hepatic metabolism (%) | < 0.02 | 0.2 | 2–5 | 20 | **High-Yield:** Among the three modern volatile agents (isoflurane, sevoflurane, desflurane), **desflurane has the HIGHEST MAC (6.0%)**, meaning it is the **least potent**. Its pungency and airway irritation preclude its use for inhalational induction — it must be introduced only after IV induction or after induction with sevoflurane. **Clinical Pearl:** Desflurane's minimal hepatic metabolism (< 0.02%) and rapid emergence make it ideal for short procedures and day-case surgery, despite its airway irritability. The pungent odor is a direct result of its chemical structure and is a reliable exam clue. **Mnemonic:** **"Desflurane is DEFIANT"** — Desflurane is pungent (Defiant odor), Emergence is Fast, Irritates airways, Avoided for induction, Not metabolized hepatically, Tough (highest MAC among volatiles).
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