Which of the following is a key strategy to break the chain of infection at the 'portal of entry' stage?
Appropriate wound care
Antibiotic administration
Isolation precautions
Use of hand sanitizer
The Correct Answer is A
A. Appropriate wound care: The portal of entry is the site through which a pathogen enters a susceptible host, such as a break in the skin. Maintaining intact skin or providing sterile occlusive dressings prevents microorganisms from accessing deeper tissues. This intervention directly targets the physical interface of entry.
B. Antibiotic administration: Antibiotics function by inhibiting the growth of or destroying microorganisms that have already established an infection within the host. This action primarily targets the pathogen itself rather than the portal through which it entered. It is a secondary defense mechanism used after infection has progressed.
C. Isolation precautions: Isolation is designed to contain the reservoir or the source of the pathogen to prevent its dissemination to others. This strategy focuses on the reservoir or mode of transmission links within the chain of infection. It does not specifically protect the anatomical entry points.
D. Use of hand sanitizer: Hand hygiene is the most effective method for disrupting the mode of transmission by removing pathogens from the hands of healthcare workers. While it reduces the microbial load, it does not specifically seal or protect the biological portal of entry on the patient.
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Correct Answer is D
Explanation
A. To prevent transmission of MRSA by airborne particles:Methicillin-resistant Staphylococcus aureus(MRSA) is not an airborne pathogen; it does not travel on small nuclei that remain suspended in the air. Airborne precautions require N95 respirators and negative pressure rooms, which are unnecessary for MRSA. Its primary mode of spread is through physical contact.
B. To ensure the patient receives adequate hydration:Hydration status is a physiological need that is managed through fluid intake protocols and has no relationship to infection control precautions. Precautions are designed to protect the environment and other patients, not to monitor the patient's fluid balance. This choice confuses clinical care with infection prevention.
C. To protect the patient's normal flora from MRSA:Contact precautions are designed to keep the patient's MRSA from reaching others, not to protect the patient from their own colonization. The patient's normal flora is already disrupted by the presence of the resistant organism. These measures are an extrinsic barrier for the benefit of the community.
D. To prevent MRSA transmission through direct or indirect contact:MRSA is easily spread via the hands of healthcare workers or contaminated surfaces such as bedrails and medical equipment. Contact precautions, including the use of gowns and gloves, provide a physical barrier to break the chain of infection. This is the evidence-based standard for containing multi-drug resistant organisms.
Correct Answer is B
Explanation
A. 50 gtt/min: This rate would deliver the 100 mL infusion in only 30 minutes, which is twice as fast as the prescribed rate. Rapid infusion of certain medications can lead to adverse effects or toxicity. Accurate calculation is essential when an electronic pump is not available.
B. 25 gtt/min: The manual drip rate is calculated by multiplying the total volume (100 mL) by the drop factor (15 gtt/mL) and dividing by the time in minutes (60 min). 1500 divided by 60 equals 25. This ensures the 100 mL is delivered precisely over the 1-hour period.
C. 75 gtt/min: This drip rate would result in the entire volume being infused in approximately 20 minutes. Such a high rate is incorrect for a 1-hour schedule and could cause fluid overload or infusion-related reactions. It significantly exceeds the required delivery speed of 1.67 mL per minute.
D. 60 gtt/min: Setting the rate to 60 drops per minute would infuse the medication in about 25 minutes. This does not align with the prescribed 1-hour duration for the 100 mL volume. Proper use of the drip factor formula prevents such timing errors in manual administration.
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