Which statement best describes the effect of CAIs when added to PGAs?

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Boost your readiness for the Primary Open-Angle Glaucoma Test. Utilize flashcards and multiple-choice questions complete with hints and detailed explanations to enhance your understanding.

Multiple Choice

Which statement best describes the effect of CAIs when added to PGAs?

Explanation:
Adding a carbonic anhydrase inhibitor to a prostaglandin analogue gives an extra drop in IOP because they lower intraocular pressure through different mechanisms—PGAs increase outflow, while CAIs reduce aqueous humor production. When used together, the effect is additive, typically giving about an additional 3–4 mmHg reduction in IOP. This is why the statement describing an extra 3–4 mmHg decrease is the best choice. The other options aren’t consistent with how these drugs work together: there is an extra IOP-lowering effect, they don’t raise IOP, and cataracts aren’t a direct result of adding a CAI.

Adding a carbonic anhydrase inhibitor to a prostaglandin analogue gives an extra drop in IOP because they lower intraocular pressure through different mechanisms—PGAs increase outflow, while CAIs reduce aqueous humor production. When used together, the effect is additive, typically giving about an additional 3–4 mmHg reduction in IOP. This is why the statement describing an extra 3–4 mmHg decrease is the best choice. The other options aren’t consistent with how these drugs work together: there is an extra IOP-lowering effect, they don’t raise IOP, and cataracts aren’t a direct result of adding a CAI.

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