Which action does adrenaline primarily produce in an anesthetic emergency?

• A. Stimulates heart rhythm and increases contractility
• B. Causes dizziness
• C. Directly lowers blood pressure
• D. Promotes bronchial constriction

Answer: (A)

Adrenaline’s main action in an anesthetic emergency is to stimulate the heart through beta-1 receptors, increasing both heart rate and the strength of each contraction. This raises cardiac output and improves tissue perfusion, which is crucial when circulation is compromised. While adrenaline also has vasoconstrictive effects that help raise blood pressure, the essential benefit in an acute crisis comes from the heart’s increased pumping action.

Dizziness and a direct drop in blood pressure aren’t the primary intended effects in this context, and adrenaline actually tends to raise blood pressure rather than lower it. Adrenaline also promotes bronchodilation (not constriction), which helps open the airways during airway compromise.