Final answer:
The nurse's action that indicates the instillation of fluids into a body cavity is 3.flushing the vagina with medicated fluid, a process used to apply medication directly to the desired area, commonly utilized in health-care settings for targeted treatments.
Step-by-step explanation:
The action of the nurse that indicates the instillation of fluids into a body cavity is flushing the vagina with medicated fluid. This process involves the introduction of a fluid into a body cavity, usually for cleansing or therapeutic purposes. Instillation is a common practice in medical treatments and allows direct application of substances to specific areas. An example would be douching or vaginally administered medications. The instillation technique is used to ensure the medication comes into contact with the affected mucosa or tissues, allowing for better absorption and effectiveness. Unlike methods such as oral or parenteral administration, which aim for systemic effects, instillation targets local areas for specific results.
Fluid build-up in a body cavity can lead to complications such as infection, inflammation, or impairment of normal organ function. For example, in clinical settings, the accumulation of fluid around a central venous catheter can lead to infections, which might require both systemic and localized treatments with antibiotics. Accurate and sterile instillation of medication can mitigate such risks and aid in therapy.