Final answer:
True, tPA can be administered within up to 4.5 hours of symptom onset in select patients with ischemic stroke. Quick determination of the stroke's cause is essential as tPA is suitable for thrombotic strokes, not hemorrhagic ones. The FAST mnemonic can aid in the prompt recognition of stroke symptoms.
Step-by-step explanation:
The statement that tPA can be administered within up to 4.5 hours from symptom onset in select stroke patients is True. tPA, or tissue plasminogen activator, is a thrombolytic agent used in the treatment of ischemic stroke, which is caused by a blood clot obstructing blood flow to the brain. The timely administration of tPA is critical to improving the prognosis of stroke patients. Administering tPA to clear the clot can restore blood flow and minimize brain damage. It's important to note that not all strokes are due to clots; some are caused by hemorrhage, in which case tPA would be contra-indicated. Therefore, the cause of the stroke must be determined with urgency before proceeding with thrombolytic therapy. Remembering the FAST mnemonic—Face drooping, Arm weakness, Speech difficulties, Time to call emergency services—can help identify stroke symptoms quickly