Situation: A 64-year-old woman is brought to a stroke-ready hospital with sudden right-sided weakness and slurred speech that began 90 minutes ago. She weighs 104 kg. Noncontrast computed tomography (CT) shows no hemorrhage, and the team plans intravenous (IV) alteplase for acute ischemic stroke. Her blood pressure is 194/108 mmHg. What should the nurse do before the alteplase is started?

Blood pressure must be below 185/110 mmHg before thrombolysis and kept below 180/105 mmHg for 24 hours afterward to limit the risk of intracranial hemorrhage. Her pressure is lowered with an IV agent such as labetalol, and alteplase is given once the target is reached.

Why blood pressure must be controlled before alteplase
Alteplase is a recombinant tissue plasminogen activator that converts plasminogen to plasmin and dissolves the fibrin mesh of an acute clot. The most feared complication of IV alteplase is symptomatic intracranial hemorrhage, and the single strongest modifiable risk factor for that hemorrhage is uncontrolled arterial pressure at the time of thrombolysis and during the first 24 hours afterward. In a patient with an acute ischemic stroke, the brain has already lost autoregulation in the ischemic penumbra; that region becomes passively dependent on systemic pressure. However, when alteplase is given while the pressure is very high, the same elevated perfusion pressure can rupture reperfused, fragile microvessels and convert an ischemic infarct into a hemorrhagic one. The pre-thrombolysis blood pressure threshold of 185/110 mmHg is therefore not a suggestion; it is a safety gate that must be achieved before the alteplase infusion begins. ^[1][2]

Applying the threshold to this patient
This patient’s pressure is 194/108 mmHg. The systolic value is above the 185 mmHg cutoff, while the diastolic is just below 110 mmHg. Because either component exceeding the threshold disqualifies the patient from immediate alteplase, the nurse must recognize that the pressure must be actively lowered first. The correct sequence is to administer a short-acting IV antihypertensive such as labetalol, recheck the pressure, and proceed with alteplase only when the pressure is documented below 185/110 mmHg. Watch out! The target is below 185/110 mmHg before alteplase, not below 140/90 mmHg. Overly aggressive lowering can reduce perfusion to the ischemic penumbra and enlarge the infarct. ^[1]

Why permissive hypertension is not acceptable here
In patients who are not candidates for reperfusion therapy, guidelines generally allow blood pressure to remain untreated up to 220/120 mmHg because moderate hypertension may preserve cerebral perfusion through collateral vessels. This is the concept behind permissive hypertension. However, that principle applies only when thrombolysis is not being given. Once alteplase is planned, the acceptable upper limit drops to 185/110 mmHg, and pressures above that must be treated before the drug is started. The reason is that the hemorrhagic risk from alteplase outweighs any theoretical benefit of allowing the pressure to remain high during clot lysis. ^[2]

Post-thrombolysis blood pressure management
The blood pressure requirement does not end when the alteplase bolus is given. After thrombolysis, the pressure must be maintained below 180/105 mmHg for the next 24 hours. This is slightly lower than the pre-treatment threshold because the risk of reperfusion hemorrhage persists while the drug is active and while the infarcted tissue remains vulnerable. The nurse must therefore monitor blood pressure frequently—typically every 15 minutes for the first 2 hours, then every 30 minutes for 6 hours, then hourly—and report any rise above the post-thrombolysis target immediately. Key point! The pre-alteplase gate is 185/110 mmHg; the post-alteplase maintenance goal is below 180/105 mmHg for 24 hours. ^[1][2]

Why labetalol is the preferred agent
Labetalol is a combined alpha-1 and nonselective beta-adrenergic blocker that lowers blood pressure smoothly without causing reflex tachycardia or a precipitous drop in cerebral perfusion. It can be given as repeated small IV boluses, which allows the nurse to titrate the pressure down gradually and stop as soon as the target is reached. This titratability is critical in acute ischemic stroke because an abrupt fall in pressure can worsen neurologic deficits. Other IV options such as nicardipine or clevidipine may be used, but labetalol remains the most common first-line agent in thrombolysis protocols. The goal is controlled reduction to just below 185/110 mmHg, not rapid normalization.

Comparing the options

Option	Analysis
1. Give labetalol and recheck until below 185/110 mmHg	Correct. This follows the pre-thrombolysis safety gate and allows alteplase once the target is reached.
2. Start alteplase now, permissive hypertension protects the brain	Incorrect. Permissive hypertension applies to non-thrombolysis patients; alteplase candidates must be below 185/110 mmHg.
3. Hold alteplase, any pressure above 180/105 mmHg excludes her	Incorrect. The pre-treatment exclusion threshold is 185/110 mmHg, not 180/105 mmHg. Her pressure can be treated, and alteplase can still be given.
4. Give labetalol to bring pressure below 140/90 mmHg	Incorrect. This overshoots the target and risks reducing penumbral perfusion. The pre-alteplase target is below 185/110 mmHg.

Clinical reasoning for the nursing licensure examinee
The nurse’s role in this scenario is not simply to carry out an order but to recognize that the blood pressure must be treated before alteplase can safely be administered. The sequence is: assess the pressure, identify that it exceeds the 185/110 mmHg threshold, administer the ordered IV labetalol, recheck the pressure, and then proceed with alteplase once the target is confirmed. Watch out! The window for alteplase is time-sensitive, but giving the drug with an uncontrolled pressure above the threshold creates a greater risk of intracranial hemorrhage than the delay caused by brief, controlled blood pressure reduction. The nurse must also anticipate that the pressure will need to be monitored closely for the full 24 hours after thrombolysis, with a maintenance target below 180/105 mmHg. ^[1][2]