Which statement best describes the difference between ARBs and ACE inhibitors?

Which statement best describes the difference between ARBs and ACE inhibitors?

• A. ARBs block the angiotensin II receptor while ACE inhibitors block the ACE enzyme.
• B. ARBs increase angiotensin II levels while ACE inhibitors decrease them.
• C. ARBs block bradykinin production while ACE inhibitors increase bradykinin.
• D. ARBs inhibit renin release while ACE inhibitors inhibit aldosterone.

Answer: (A)

The main idea is where each drug acts in the renin-angiotensin system. An ARB blocks the angiotensin II type 1 receptor, so angiotensin II cannot produce its usual effects like vasoconstriction and aldosterone release, even if angiotensin II levels are high. A true ACE inhibitor stops the formation of angiotensin II by inhibiting the ACE enzyme, lowering angiotensin II levels and thus reducing vasoconstriction and aldosterone. A notable difference is bradykinin: ACE inhibitors raise bradykinin by preventing its breakdown, which can lead to cough or angioedema, whereas ARBs do not affect bradykinin. This is why ARBs and ACE inhibitors have similar blood pressure and kidney-protective benefits, but different side effect profiles.

The main idea is where each drug acts in the renin-angiotensin system. An ARB blocks the angiotensin II type 1 receptor, so angiotensin II cannot produce its usual effects like vasoconstriction and aldosterone release, even if angiotensin II levels are high. A true ACE inhibitor stops the formation of angiotensin II by inhibiting the ACE enzyme, lowering angiotensin II levels and thus reducing vasoconstriction and aldosterone. A notable difference is bradykinin: ACE inhibitors raise bradykinin by preventing its breakdown, which can lead to cough or angioedema, whereas ARBs do not affect bradykinin. This is why ARBs and ACE inhibitors have similar blood pressure and kidney-protective benefits, but different side effect profiles.