**Question:** Anaesthetic agent contraindicated in Emphysema is –

A. Sevoflurane
B. Desflurane
C. Propofol
D. Ketamine

**Core Concept:** Emphysema is a chronic respiratory disease characterized by destruction of alveoli leading to air trapping, hyperinflation, and impaired gas exchange. Anaesthetic agents should be chosen carefully in patients with emphysema to minimize the risk of complications and exacerbation of respiratory failure.

**Why the Correct Answer is Right:** Sevoflurane and Desflurane are both volatile anaesthetic agents with rapid onset and offset of action, minimal sympathetic stimulation, and minimal respiratory depression. They are generally considered safe in patients with emphysema as they have a low cardiac output demand, minimal vasodilation, and maintain a stable respiratory rate and effort.

**Why Each Wrong Option is Incorrect:**

C. Propofol: Propofol is a short-acting intravenous anaesthetic agent that has a higher cardiac output demand and tendency to cause hypotension and bradycardia. These effects can potentially worsen respiratory depression and hypoxia in patients with emphysema.

D. Ketamine: Ketamine is a dissociative anaesthetic agent that can cause hypertension, tachycardia, and increased respiratory rate, which can exacerbate respiratory distress in patients with emphysema.

**Why the Correct Answer is Right:**

**Core Concept:** Emphysema is a chronic respiratory disease characterized by destruction of alveoli leading to air trapping, hyperinflation, and impaired gas exchange. Anaesthetic agents should be chosen carefully in patients with emphysema to minimize the risk of complications and exacerbation of respiratory failure.

**Why Each Wrong Option is Incorrect:**

A. Propofol: Propofol is a short-acting intravenous anaesthetic agent that has a higher cardiac output demand and tendency to cause hypotension and bradycardia. These effects can potentially worsen respiratory depression and hypoxia in patients with emphysema.

D. Ketamine: Ketamine is a dissociative anaesthetic agent that can cause hypertension, tachycardia, and increased respiratory rate, which can exacerbate respiratory distress in patients with emphysema.

In contrast, Sevoflurane and Desflurane are considered safe in patients with emphysema due to their low cardiac output demand, minimal vasodilation, and maintenance of stable respiratory rate and effort.

**Clinical Pearl:** When selecting anaesthetic agents for patients with emphysema, choose agents with minimal cardiovascular and respiratory side effects to avoid exacerbating the disease process and respiratory compromise. The use of Sevoflurane and Desflurane is generally preferred due to their lower cardiovascular and respiratory side effects compared to other agents like Propofol and Ketamine.