A patient with mitral stenosis had had to undergo surgery.pre-anaesthetic checkup revealed the increased liver enzymes. Which of the following inhalational agent should be preferred in this patient?
**Core Concept**
Mitral stenosis is a valvular heart disease characterized by the narrowing of the mitral valve opening, leading to increased pressure and resistance in the left atrium. In the context of anesthesia, it is essential to choose an inhalational agent that does not significantly increase cardiac preload or afterload, thus minimizing the risk of pulmonary congestion and cardiac decompensation.
**Why the Correct Answer is Right**
Desflurane is a low solubility inhalational agent that does not significantly increase cardiac preload or afterload. It also has a rapid onset and offset of action, allowing for quick adjustments in anesthesia depth. Additionally, desflurane does not have a significant effect on cardiac contractility or heart rate, making it an ideal choice for patients with mitral stenosis. Its low blood-gas partition coefficient also reduces the risk of hypotension and cardiac decompensation.
**Why Each Wrong Option is Incorrect**
**Option A:** Halothane is a high-solubility inhalational agent that can cause a significant increase in cardiac preload and afterload, making it a poor choice for patients with mitral stenosis.
**Option B:** Isoflurane can cause vasodilation, leading to a decrease in systemic vascular resistance and potentially worsening cardiac decompensation in patients with mitral stenosis.
**Option C:** Sevoflurane has a moderate solubility and can cause a slight increase in cardiac preload and afterload, although it is generally considered safe in patients with mitral stenosis. However, it is not the preferred choice compared to desflurane.
**Clinical Pearl / High-Yield Fact**
When choosing an inhalational agent for patients with mitral stenosis, it is essential to select an agent with low solubility and minimal effect on cardiac preload and afterload. Desflurane is a preferred choice due to its rapid onset and offset of action, as well as its minimal impact on cardiac contractility and heart rate.
**Correct Answer:** C. Desflurane.