A nurse is providing care for four patients. Which patient should the nurse evaluate first for cognitive impairment?

Choice A rationale:
While providing information about post-operative care and pain management is important, it may not directly address the patient's underlying anxiety or encourage them to express their concerns.
It could be perceived as dismissive of their feelings or as an attempt to control the conversation. It focuses on the future rather than the patient's present experience.
Choice B rationale:
This response, while intended to be reassuring, may minimize the patient's individual experience and feelings. It could make the patient feel as though their concerns are not being taken seriously.
It implies that anxiety is a normal and expected reaction, which may discourage the patient from sharing their specific worries.
Choice C rationale:
This response is open-ended and invites the patient to share their thoughts and feelings.
It demonstrates active listening and encourages the patient to take an active role in the conversation.
It allows the nurse to assess the patient's understanding of the surgery and to address any misconceptions or concerns. It conveys a sense of empathy and understanding, which can help to build trust and rapport with the patient.
Choice D rationale:
While offering to explain the procedure may be helpful, it may not be what the patient needs at the moment. It could overwhelm the patient with information, particularly if they are already feeling anxious.
It could shift the focus away from the patient's emotional needs and onto the technical aspects of the surgery.

Choice A rationale:
Skin and mucous membranes are the most effective and crucial barriers to infection. They provide a continuous physical barrier that prevents pathogens from entering the body. Here's a detailed explanation of their protective mechanisms:
1. Physical Barrier:
Skin: The outermost layer of skin, the epidermis, is composed of tightly packed cells that are difficult for pathogens to penetrate. It's also covered in a layer of sebum, an oily substance that helps to repel water and microorganisms.
Mucous membranes: These moist linings cover the openings of the body, such as the nose, mouth, eyes, and digestive, respiratory, and urogenital tracts. They produce mucus, a sticky substance that traps pathogens and prevents them from entering the body. Mucus also contains enzymes and antibodies that can kill certain pathogens.
2. Chemical Barrier:
Skin and mucous membranes secrete a variety of substances that have antimicrobial properties. These include: Sebum: Contains fatty acids that can kill bacteria and fungi.
Sweat: Contains salt and lysozyme, an enzyme that can break down bacterial cell walls. Saliva: Contains enzymes that can break down food and kill bacteria.
Gastric acid: The highly acidic environment of the stomach kills most pathogens that are ingested.
3. Immune Barrier:
Skin and mucous membranes are home to a diverse community of microbes, known as the microbiome. These microbes play an important role in protecting against infection by competing with pathogens for resources and space.
Mucous membranes contain specialized immune cells, such as M cells and dendritic cells, that can recognize pathogens and initiate an immune response.
In contrast, the other choices are less effective barriers to infection:
Choice B: Gastrointestinal secretions, such as gastric acid, do play a role in preventing infection, but they are not as effective as skin and mucous membranes. Pathogens can still enter the body through the digestive tract, even in the presence of gastric acid.
Choice C: Colonization by host bacteria can actually help to protect against infection by competing with pathogens. However, it is not a primary barrier to infection.
Choice D: Inflammatory processes are a response to infection, not a barrier to it. They occur after pathogens have already entered the body.