A 58-year-old woman presents to the emergency department with a sudden onset of right-sided weakness and slurred speech that began 90 minutes ago. She has a history of hypertension and atrial fibrillation but is not currently on anticoagulation. A non-contrast head CT shows no evidence of intracranial hemorrhage. The medical team is considering intravenous tPA therapy for thrombolysis. Which of the following is an absolute contraindication to tPA administration in this patient?
