A Cardiovascular nurse is preparing to measure a client's level of oxygen saturation and observes edema of both hands and thickened toenails. The nurse should apply the pulse oximeter probe to which of the following locations?

The correct answer is choice B. Necrotic subcutaneous tissue.

Choice A rationale:

Partial-thickness skin loss (Choice A) is characteristic of a stage II pressure ulcer, not a stage III ulcer. A stage II pressure ulcer involves the loss of the epidermis and possibly the dermis, resulting in a shallow open ulcer with a red-pink wound bed.

Choice B rationale:

Necrotic subcutaneous tissue is a manifestation of a stage III pressure ulcer. A stage III ulcer involves full-thickness skin loss where subcutaneous fat may be visible, but exposed bone or muscle is not yet present. Necrotic tissue in the wound bed indicates a more advanced level of tissue damage and the need for appropriate wound care to promote healing.

Choice C rationale:

Blood-filled blisters (Choice C) are not specific to pressure ulcers and are more commonly associated with friction or shear forces. These blisters are not indicative of a stage III pressure ulcer, which involves visible full-thickness tissue loss.

Choice D rationale:

Exposed bone (Choice D) is a characteristic of a stage IV pressure ulcer, not a stage III ulcer. A stage IV ulcer involves extensive tissue loss with exposure of muscle, tendon, or bone. This represents a severe level of tissue damage and requires intensive wound care and management.

Choice A rationale:

Justice. Justice refers to fair and equitable treatment for all individuals. While it is an important ethical principle, it does not directly relate to the nurse's action of returning a telephone call promptly and as promised. Justice involves issues of fairness and distribution of resources, and it's not the most applicable principle in this context.

Choice B rationale:

Nonmaleficence. Nonmaleficence refers to the principle of "do no harm." While it is crucial in healthcare, it doesn't directly address the nurse's action of returning a client's call promptly. This principle is more concerned with preventing harm in clinical interventions and decision-making.

Choice C rationale:

Fidelity. Fidelity, or faithfulness, is the ethical principle that aligns with the nurse's action in this scenario. By returning the call by the end of the day as promised, the nurse is demonstrating fidelity to the client's trust and expectations. This principle emphasizes the importance of keeping promises and being loyal to commitments made to clients.

Choice D rationale:

Autonomy. Autonomy pertains to an individual's right to make their own decisions about their care and treatment. While autonomy is a vital principle in healthcare, it does not directly relate to the nurse's action of returning a telephone call promptly. Autonomy focuses more on involving the client in their care decisions and respecting their choices.