A nurse is caring for a client who is using a continuous passive motion (CPM) machine following a total knee arthroplasty. Which of the following actions should the nurse take?

Choice A reason: Droplet precautions are used for diseases that are transmitted through large respiratory droplets produced by coughing, sneezing, or talking. AIDS, caused by the Human Immunodeficiency Virus (HIV), is not transmitted through respiratory droplets, so droplet precautions are not necessary for a client with AIDS.

Choice B reason: Standard precautions are the primary strategy for the prevention of infection transmission and apply to all patients receiving care in hospitals, regardless of their diagnosis or presumed infection status. These precautions include hand hygiene, the use of personal protective equipment (PPE) like gloves and gowns, and safe injection practices. Since HIV/AIDS can be transmitted through blood and certain body fluids, standard precautions are essential when caring for clients with AIDS.

Choice C reason: Airborne precautions are used for diseases that are transmitted by small droplet nuclei that remain suspended in the air and can be widely dispersed by air currents within a room or over a long distance. HIV/AIDS is not transmitted through the airborne route, so airborne precautions are not indicated for clients with AIDS.

Choice D reason: Contact precautions are used for infections that are spread by direct contact with the patient or indirect contact with surfaces or patient care items. While HIV can be present in body fluids, it is not easily transmitted through casual contact. Therefore, contact precautions are not specifically required for clients with AIDS unless they have other conditions that warrant such precautions.

Choice A reason: Epinephrine is primarily used in emergency situations for its vasoconstrictive and bronchodilatory effects, particularly in cases of anaphylaxis or cardiac arrest. It is not typically used to manage symptoms associated with brainstem contusions or to regulate urinary output.

Choice B reason: Furosemide is a loop diuretic commonly prescribed to reduce fluid retention in conditions such as heart failure or renal disease. Given that the client has already produced a large volume of urine (4,000 mL in 24 hours, which is above the normal range of 800 to 2,000 milliliters per day), administering furosemide would not be appropriate as it would likely exacerbate the excessive urinary output.

Choice C reason: Nitroprusside is a potent vasodilator used to treat acute hypertensive crises. It has no role in the management of thirst or regulation of urinary output and is not indicated for the treatment of brainstem contusions.

Choice D reason: Desmopressin is a synthetic analogue of the naturally occurring antidiuretic hormone vasopressin. It is used to treat conditions characterized by excessive urination, such as diabetes insipidus, and to manage polyuria and polydipsia (excessive thirst) following head trauma or surgery in the pituitary region. In the context of a brainstem contusion with a reported high urinary output, desmopressin would be the appropriate medication to prescribe to reduce urine volume and address the client's thirst.