The nurse is reviewing clinical practice guidelines on central line management in order to create a process improvement project that decreases central-line associated bloodstream infections (CLABSI). Which level of evidence is the nurse using?

The patient with severe, symptomatic anemia who is a Jehovah's Witness refuses a blood transfusion for religious reasons. The nurse instructs the provider to discontinue the order. This is an example of which ethical principle? 

The nurse is supervising the care of the patient who suffered an embolic stroke of the right middle cerebral artery after a clot formed on the patient’s prosthetic mitral valve. Which instruction does the nurse provide to the unlicensed assistive personnel that will be most important to prevent bacterial endocarditis?