**Question:** An asthmatic patient is posted for elective hernia repair. Which of the following inhalational anaesthetic agents are preferred for induction in this patient?

A. Sevoflurane
B. Isoflurane
C. Desflurane
D. Halothane

**Correct Answer:** .

**Core Concept:** Asthma is a chronic respiratory condition characterized by airway inflammation, hyperresponsiveness, and airflow limitation. Inhalational anesthetic agents are commonly used for induction in elective surgeries, but the choice depends on the patient's medical history, including the presence of underlying lung conditions like asthma.

**Why the Correct Answer is Right:** Sevoflurane is preferred among the given choices because it has a lower risk of bronchoconstriction and airway hyperresponsiveness compared to other agents. Sevoflurane has a low potency and a rapid onset and offset of action, making it suitable for elective surgeries like hernia repair.

**Why Each Wrong Option is Incorrect:**

1. Isoflurane: It has a similar risk of causing bronchoconstriction and airway hyperresponsiveness as DEXA (dexmedetomidine), which is not a suitable choice for asthmatic patients.
2. Desflurane: Similar to isoflurane, desflurane carries a risk of bronchoconstriction and airway hyperresponsiveness in asthmatic patients.
3. Halothane: Halothane has a higher risk of airway hyperresponsiveness and bronchoconstriction compared to sevoflurane, rendering it an unsuitable choice for an asthmatic patient.

**Why Sevoflurane is Right:**

**Clinical Pearl:** While inhaled anesthetics can cause bronchoconstriction in asthmatic patients, careful selection of an agent with minimal bronchoconstrictive effects is crucial. Sevoflurane is a suitable choice due to its lower risk of bronchoconstriction and airway hyperresponsiveness compared to other inhalational agents. This makes it a safer option for an asthmatic patient undergoing elective surgery like hernia repair, ensuring a smoother anesthetic procedure and reduced postoperative respiratory complications.

**Why Each Wrong Option is Incorrect:**

**Option A (Isoflurane):** Isoflurane has a similar risk profile as sevoflurane, making it unsuitable for an asthmatic patient.

**Option B (Desflurane):** Similar to isoflurane, desflurane carries a higher risk of airway hyperresponsiveness and bronchoconstriction in asthmatic patients, rendering it an unsuitable choice.

**Option C (Halothane):** Halothane has a higher risk of bronchoconstriction and airway hyperresponsiveness compared to sevoflurane, making it the least suitable choice for an asthmatic patient undergoing elective surgery.

In summary, the selection of sevoflurane is more appropriate for an asthmatic patient undergoing elective surgery due to its lower risk profile for bronchoconstriction and airway