A nurse is assessing a client who is receiving heparin via continuous IV infusion. The client has an increased aPTT level. The nurse should monitor the client for which of the following changes in their vital signs?

A. Increased pulse rate may indicate hemorrhage or hypovolemia, which are risks associated with heparin therapy, especially if the aPTT is elevated. B. Increased blood pressure is not typically associated with heparin therapy and would not be expected with an elevated aPTT. C. Decreased respiratory rate is not a common effect of increased aPTT or heparin therapy. D. Decreased temperature is not typically related to an elevated aPTT level.