Nclex Practice Quiz: Aortic Valve Replacement Monitoring in the ICU Nclex Practice Quiz: Aortic Valve Replacement Monitoring in the ICU A client who underwent an aortic valve replacement 2 hours ago is in the ICU and their radial arterial line low pressure alarm sounds. What is the nurse's first action?* 1. Check for bleeding at tube connection sites 2. Perform a fast flush of the arterial line system 3. Re-level the transducer to the phlebostatic axis 4. Zero and re-balance the monitor and system Δ