## Blood-Gas Partition Coefficient and Emergence Speed The blood-gas partition coefficient determines how readily an anesthetic dissolves in blood relative to the alveolar gas phase. A lower coefficient indicates faster emergence because less anesthetic dissolves in blood, allowing rapid elimination via exhalation. ### Blood-Gas Partition Coefficients of Inhalational Agents | Agent | Blood-Gas Coefficient | Emergence Speed | Clinical Implication | |-------|----------------------|-----------------|---------------------| | Desflurane | 0.42 | Very rapid (fastest) | Quickest recovery; ideal for day surgery | | Nitrous oxide | 0.47 | Very rapid | Rapid but slightly slower than desflurane | | Sevoflurane | 0.65 | Rapid | Faster than isoflurane but slower than desflurane | | Isoflurane | 1.4 | Moderate | Slower emergence | **Key Point:** Desflurane has the LOWEST blood-gas partition coefficient (0.42) among volatile agents, making it the fastest agent for emergence from anesthesia. **High-Yield:** Blood-gas partition coefficient is inversely related to emergence speed — lower coefficient = faster emergence. This is a frequently tested concept in NEET PG anesthesia. **Clinical Pearl:** Desflurane's rapid emergence makes it ideal for outpatient and day-case surgeries where quick recovery and discharge are priorities. However, it is pungent and causes airway irritation, so it is not used for inhalational induction. **Mnemonic:** **DNIS** (in order of increasing blood-gas coefficient) — Desflurane (0.42), Nitrous oxide (0.47), Isoflurane (1.4), Sevoflurane (0.65) — remember desflurane is fastest for emergence.
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