A nurse is caring for a client who has an oxygen saturation of 88 percent. Which of the following actions should the nurse take?

Choice A rationale

Quality improvement involves using data to monitor the outcomes of care processes and using improvement methods to design and test changes to continuously improve the quality and safety of health care systems. It focuses on systemic changes rather than individual bedside actions like locking a bed. While locking the bed contributes to better outcomes, it is a direct safety protocol rather than a systemic data-driven process designed to change institutional policies or clinical procedures.

Choice B rationale

Patient-centered care emphasizes recognizing the patient or designee as the source of control and full partner in providing compassionate and coordinated care based on respect for the patient's preferences, values, and needs. While providing a call light respects the patient's need for communication and assistance, the primary motivation for ensuring the bed is locked and the light is reachable is to prevent physical harm and falls, which falls specifically under the safety competency.

Choice C rationale

The safety competency focuses on minimizing risk of harm to patients and providers through both system effectiveness and individual performance. Ensuring the bed is locked prevents sudden movement that could cause a fall during transfers. Placing the call light within reach ensures the patient can summon help without overreaching or attempting to ambulate unassisted. These actions are fundamental safety interventions designed to protect the patient from accidental injury while in the hospital environment.

Choice D rationale

Teamwork and collaboration involve functioning effectively within nursing and inter-professional teams, fostering open communication, mutual respect, and shared decision-making to achieve quality patient care. This competency focuses on how healthcare workers interact with one another to manage patient needs. Since the actions described involve a single nurse performing routine environmental safety checks for a client before leaving the room, it does not involve the multidisciplinary coordination characteristic of this specific QSEN competency.

Choice A rationale

Enamel is the hardest and most highly mineralized substance in the human body, covering the outer layer of each tooth. It acts as a protective barrier against the acids produced by plaque bacteria and mechanical wear from chewing. Because it lacks living cells, it cannot repair itself once damaged. Maintaining this mineralized shield is critical in preventing dental caries and preserving the structural integrity of the teeth.

Choice B rationale

Langerhans cells are dendritic cells found primarily in the stratum spinosum of the epidermis and are part of the immune system. They function as antigen-presenting cells, identifying foreign invaders and initiating an immune response. They have no role in the structural coating of teeth or protection against plaque. Their presence is vital for skin immunity and capturing pathogens that breach the physical skin barrier.

Choice C rationale

Cilia are microscopic, hair-like projections found on the surfaces of certain cells, such as those lining the respiratory tract. They function to move mucus and trapped particles out of the lungs through a rhythmic waving motion. Cilia are biological structures involved in clearance and transport within mucous membranes. They are not found in dental anatomy and do not provide a protective coating for the teeth.

Choice D rationale

Keratin is a fibrous structural protein that makes up the outer layer of the skin, hair, and nails, providing a waterproof and protective surface. While it is essential for the integrity of the integumentary system, it is not a component of dental tissue. Keratinization helps the skin withstand friction and environmental exposure, but the teeth rely on mineralized enamel rather than protein-based keratin for protection.