A client had a new artificial aortic heart valve implanted three days ago and is receiving a heparin IV infusion. The client's activated partial thromboplastin time (aPTT) is 60 seconds, and the international normalized ratio (INR) is 2. The nurse should prepare the client for which change in prescriptions? Reference Range: Activated partial thromboplastin time (aPTT) [1.5 to 2.5 times the control value in seconds.] International normalized ratio (INR) [0.8 to 1.1]