A client who has just experienced a pulmonary embolism is administered alteplase (Activase). Which of the following side effects associated with this medication would the nurse assess for?

A. Hypokalemia is not a common side effect of alteplase; instead, it may result from other factors. B. Internal bleeding is a significant risk associated with thrombolytics like alteplase, as they promote the breakdown of clots but can also affect hemostasis. C. Pancytopenia is not directly associated with alteplase use; it may occur with other medications or conditions. D. Hypertension is not a common side effect of alteplase; instead, blood pressure may fluctuate but is not typically increased as a direct result of the medication.