What blood pressure threshold excludes the use of tPA in ischemic stroke?

What blood pressure threshold excludes the use of tPA in ischemic stroke?

• A. 180/105
• B. 185/110
• C. 190/100
• D. 200/120

Answer: (B)

The key idea is that giving thrombolysis in acute ischemic stroke requires keeping blood pressure at a level that minimizes the risk of bleeding in the brain. The safety cutoff is a systolic pressure of 185 and a diastolic pressure of 110. If either value is at or above these numbers, thrombolysis should not be started until you lower the BP below that threshold. This is because higher pressures increase the risk of intracranial hemorrhage when a thrombolytic is given. In practice, you would start antihypertensive therapy (for example, IV labetalol or nicardipine) to bring BP below 185/110, then proceed with tPA within the eligible time window. After tPA, aim to keep BP below about 180/105 for the next 24 hours to reduce hemorrhagic risk. So, a BP of 180/105 is below the threshold and could still allow tPA, while 185/110 is at the threshold, and values like 190/100 or 200/120 exceed it and would exclude tPA until BP is lowered.

The key idea is that giving thrombolysis in acute ischemic stroke requires keeping blood pressure at a level that minimizes the risk of bleeding in the brain. The safety cutoff is a systolic pressure of 185 and a diastolic pressure of 110. If either value is at or above these numbers, thrombolysis should not be started until you lower the BP below that threshold. This is because higher pressures increase the risk of intracranial hemorrhage when a thrombolytic is given.

In practice, you would start antihypertensive therapy (for example, IV labetalol or nicardipine) to bring BP below 185/110, then proceed with tPA within the eligible time window. After tPA, aim to keep BP below about 180/105 for the next 24 hours to reduce hemorrhagic risk.

So, a BP of 180/105 is below the threshold and could still allow tPA, while 185/110 is at the threshold, and values like 190/100 or 200/120 exceed it and would exclude tPA until BP is lowered.