Rapid induction of anesthesia occurs with which of the following inhalation anesthetics?
**Core Concept**
The question is testing the pharmacological properties of inhalation anesthetics, specifically their induction characteristics. The correct answer will be an anesthetic agent known for its rapid onset of action.
**Why the Correct Answer is Right**
Sevoflurane is a commonly used inhalation anesthetic that rapidly induces anesthesia due to its high blood/gas partition coefficient (0.69). This low coefficient allows for rapid equilibration between the alveoli and the bloodstream, resulting in a quick onset of action. Sevoflurane works by depressing the central nervous system through the potentiation of gamma-aminobutyric acid (GABA) receptors.
**Why Each Wrong Option is Incorrect**
* **Option A:** Desflurane has a low blood/gas partition coefficient (0.42), but it is not typically used for rapid induction due to its pungent smell and potential for airway irritation.
* **Option B:** Isoflurane has a moderate blood/gas partition coefficient (1.46), making it less suitable for rapid induction compared to Sevoflurane.
* **Option C:** Halothane has a high blood/gas partition coefficient (2.4), which is actually a disadvantage for rapid induction.
**Clinical Pearl / High-Yield Fact**
When choosing an inhalation anesthetic for rapid induction, consider agents with low blood/gas partition coefficients and minimal airway irritation potential.
**Correct Answer:** C. Sevoflurane.