A nurse studying infection control learns that which factor is the most effective and crucial barrier to infection?
Skin and mucous membranes
Gastrointestinal secretions
Colonization by host bacteria
Inflammatory processes
The Correct Answer is A
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.
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Related Questions
Correct Answer is A
Explanation
Choice A rationale:
Addresses the family's fear directly: By demonstrating how to avoid spreading the disease, the nurse directly addresses the family's primary concern, which is the fear of contracting the infection. This proactive approach provides education and reassurance, empowering the family to make informed decisions about visitation.
Promotes understanding and adherence to precautions: Clear instruction on how to don and doff personal protective equipment, hand hygiene techniques, and other infection control measures increases the likelihood that the family will follow the precautions correctly, reducing the risk of transmission.
Empowers the family to make informed choices: By providing knowledge and skills, the nurse enables the family to feel more confident in their ability to visit safely. This sense of control can help to alleviate anxiety and promote positive coping mechanisms.
Facilitates open communication and trust: The demonstration creates an opportunity for the nurse to answer questions, address concerns, and build rapport with the family. This open dialogue can foster trust and collaboration, which are essential for effective care.
Choice B rationale:
May provide false reassurance: While it's important to offer support and hope, it's not always possible to guarantee that family members will not contract the infection. Absolute reassurances could potentially lead to complacency or disregard for precautions, increasing the risk of transmission.
Fails to address the need for education: Simply stating that the family won't get sick doesn't provide them with the knowledge and skills needed to protect themselves and the client. This lack of understanding could result in accidental transmission.
Choice C rationale:
May pressure the family: Encouraging visitation without addressing underlying fears and concerns could be perceived as pressure, leading to resentment, anxiety, or even avoidance. It's important to respect the family's decision-making process and provide support regardless of their choice.
Doesn't prioritize safety: While emotional support is important, the primary focus should be on ensuring the safety of both the client and the family. Encouraging visitation without proper education and precautions could compromise safety.
Choice D rationale:
Focuses on compliance rather than understanding: Informing the family about legal mandates may come across as authoritarian and could potentially increase anxiety or resistance. It's more effective to focus on the rationale behind the precautions and emphasize their role in protecting both the client and the family.
Misses an opportunity to build trust: Simply stating the rules without engaging in dialogue may hinder open communication and trust-building. Taking a collaborative approach and addressing concerns can lead to better understanding and adherence to precautions.
Correct Answer is C
Explanation
Step 1: Divide the prescribed dose (40 mg) by the concentration on hand (30 mg/mL).
Step 2: Perform the calculation: 40 mg ÷ 30 mg/mL = 1.3333 mL.
Step 3: Round the answer to the nearest tenth: 1.3333 mL rounds to 1.3 mL.
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