Which medication can be given to reduce blood pressure so that tPA can be administered?

Which medication can be given to reduce blood pressure so that tPA can be administered?

• A. Atenolol
• B. Labetalol
• C. Lisinopril
• D. Hydralazine

Answer: (B)

The key idea is lowering blood pressure quickly and safely to the level where IV tPA can be given. For ischemic stroke, tPA is approved only if blood pressure is below 185/110 mmHg; if it’s higher, you need rapid, controlled reduction. Labetalol is the best choice here because it provides fast, reliable BP lowering with a single IV agent that has both alpha- and beta-blocking effects. The alpha-blockade helps dilate vessels, while the beta-blockade reduces heart rate and contractility, allowing a controlled drop in blood pressure without severely compromising cerebral perfusion. Onset is minutes after IV administration, making it ideal for the time-sensitive context of thrombolysis. Atenolol is mainly a beta-blocker without the rapid alpha-blockade needed for quick BP control in acute settings. Lisinopril, an ACE inhibitor, has slower onset and is not ideal for rapid BP reduction in the ED. Hydralazine can lower BP quickly but often causes reflex tachycardia and unpredictable swings in pressure, which can be risky when preparing for tPA. So, intravenous labetalol provides the fastest, most controllable reduction to meet the tPA threshold.

The key idea is lowering blood pressure quickly and safely to the level where IV tPA can be given. For ischemic stroke, tPA is approved only if blood pressure is below 185/110 mmHg; if it’s higher, you need rapid, controlled reduction.

Labetalol is the best choice here because it provides fast, reliable BP lowering with a single IV agent that has both alpha- and beta-blocking effects. The alpha-blockade helps dilate vessels, while the beta-blockade reduces heart rate and contractility, allowing a controlled drop in blood pressure without severely compromising cerebral perfusion. Onset is minutes after IV administration, making it ideal for the time-sensitive context of thrombolysis.

Atenolol is mainly a beta-blocker without the rapid alpha-blockade needed for quick BP control in acute settings. Lisinopril, an ACE inhibitor, has slower onset and is not ideal for rapid BP reduction in the ED. Hydralazine can lower BP quickly but often causes reflex tachycardia and unpredictable swings in pressure, which can be risky when preparing for tPA.

So, intravenous labetalol provides the fastest, most controllable reduction to meet the tPA threshold.