CRDTS Local Anesthesia Practice Test

What effect do beta blockers have on blood pressure?

Increase Decrease No effect Variable effect

Correct Answer:

Decrease

Explanation:

Beta blockers lower blood pressure by dampening the sympathetic signals that normally raise it. Blocking beta-1 receptors in the heart reduces heart rate and the force of contraction, which lowers cardiac output. They also decrease renin release from the kidneys, which reduces production of angiotensin II and aldosterone, leading to less vasoconstriction and fluid retention. Some beta blockers have additional vasodilatory effects, such as through alpha blockade or nitric oxide release, which can further help lower blood pressure. Taken together, the overall effect is a decrease in blood pressure.

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