Task: Answer Verification
Input (English): Question: Is postischemic attenuation of cerebral artery reactivity increased in the presence of tissue plasminogen activator?
Answer: These results demonstrate that both ischemia and rtPA perfusion diminish cerebral artery reactivity and that the combination may produce an additive effect. This impaired reactivity may contribute to reperfusion-induced injury during or after thrombolysis by altering upstream cerebrovascular resistance.
Output (English): yes