Abrupt and large increases in the delivered concentration of which inhalational agent may produce transient increases in systemic blood pressure and heart rate?

Abrupt and large increases in the delivered concentration of which inhalational agent may produce transient increases in systemic blood pressure and heart rate?

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

Answer: (A)

The concept being tested is how abrupt jumps in the delivered concentration of a volatile anesthetic can trigger a sympathetic surge, depending on the agent’s airway irritability and pharmacokinetics. Desflurane is known for its high airway irritability and very low blood-gas solubility, so when you rapidly raise its concentration, the alveolar and arterial levels rise quickly. That rapid rise can provoke a transient sympathetic response with a surge of catecholamines, leading to a temporary increase in systemic vascular resistance, heart rate, and blood pressure. The effect tends to be short-lived as anesthesia depth catches up or the concentration is stabilized. Other agents are less likely to cause this pattern: sevoflurane is relatively non-irritating and smoother with rapid changes, iso­flurane is pungent but more associated with vasodilation and hypotension than a brisk hypertensive response, and halothane generally depresses myocardial function and lowers blood pressure rather than producing a transient tachycardic, hypertensive surge.

The concept being tested is how abrupt jumps in the delivered concentration of a volatile anesthetic can trigger a sympathetic surge, depending on the agent’s airway irritability and pharmacokinetics. Desflurane is known for its high airway irritability and very low blood-gas solubility, so when you rapidly raise its concentration, the alveolar and arterial levels rise quickly. That rapid rise can provoke a transient sympathetic response with a surge of catecholamines, leading to a temporary increase in systemic vascular resistance, heart rate, and blood pressure. The effect tends to be short-lived as anesthesia depth catches up or the concentration is stabilized. Other agents are less likely to cause this pattern: sevoflurane is relatively non-irritating and smoother with rapid changes, iso­flurane is pungent but more associated with vasodilation and hypotension than a brisk hypertensive response, and halothane generally depresses myocardial function and lowers blood pressure rather than producing a transient tachycardic, hypertensive surge.