In managing a patient with breathing discomfort after excessive fluid infusion, which action should the nurse take?

In the context of managing a patient experiencing breathing discomfort due to excessive fluid infusion, promoting oxygen saturation through oxygen therapy is the most critical intervention. When a patient has breathing difficulties, especially related to fluid overload, it is essential to ensure that their oxygen saturation levels remain adequate to prevent hypoxia and support bodily functions.

Oxygen therapy directly addresses the immediate issue of impaired gas exchange and enhances the patient's ability to breathe comfortably. It helps to alleviate symptoms associated with respiratory distress by increasing the amount of oxygen available to the lungs, which can be particularly beneficial if the fluid overload has led to pulmonary edema or impaired ventilation.

The other options, while they may provide some benefit, do not directly resolve the oxygenation issue. Encouraging fluid intake could exacerbate the problem by increasing fluid overload. Implementing deep breathing exercises may help improve lung capacity and promote relaxation, but they do not address the immediate need for oxygen. Teaching relaxation techniques could assist in comfort, but again, it doesn't tackle the underlying issue of insufficient oxygenation due to fluid overload. Thus, providing oxygen therapy is the most appropriate and effective action for the nurse to take in this situation.