What is the initial action if the patient becomes hypotensive under anesthesia?

What is the initial action if the patient becomes hypotensive under anesthesia?

• A. Reduce vaporizer
• B. Bolus crystalloid fluids
• C. If bradycardic → anticholinergics
• D. Increase vaporizer

Answer: (A)

When a patient goes hypotensive under anesthesia, the most likely immediate issue is that the depth of anesthesia is too high, leading to vasodilation and reduced cardiac output from the volatile agent. The quickest fix is to decrease the inhaled anesthetic concentration, i.e., lower the vaporizer setting. This directly reduces the depth of anesthesia and lessens the depressant effects on heart and vessels, helping blood pressure to recover. If blood pressure stays low after reducing the anesthetic, you’d then evaluate other causes such as hypovolemia and treat with fluids or vasoactive drugs as needed. Anticholinergics for bradycardia can be considered if bradycardia accompanies hypotension, but they’re not the initial step for depth-related hypotension. Increasing the vaporizer would worsen the problem.

When a patient goes hypotensive under anesthesia, the most likely immediate issue is that the depth of anesthesia is too high, leading to vasodilation and reduced cardiac output from the volatile agent. The quickest fix is to decrease the inhaled anesthetic concentration, i.e., lower the vaporizer setting. This directly reduces the depth of anesthesia and lessens the depressant effects on heart and vessels, helping blood pressure to recover. If blood pressure stays low after reducing the anesthetic, you’d then evaluate other causes such as hypovolemia and treat with fluids or vasoactive drugs as needed. Anticholinergics for bradycardia can be considered if bradycardia accompanies hypotension, but they’re not the initial step for depth-related hypotension. Increasing the vaporizer would worsen the problem.