A nurse is caring for an elderly patient with a confirmed MRSA wound infection in a long-term care facility. Which nursing intervention demonstrates the most appropriate evidence-based practice for preventing transmission while promoting wound healing?

Strict contact precautions with hand hygiene and dedicated equipment are essential for MRSA transmission prevention while using normal saline for wound irrigation promotes healing. Other options are suboptimal for infection control or wound care.

Evidence-Based Rationale for Preventing MRSA Transmission

The correct answer is 4. The cornerstone of preventing methicillin-resistant Staphylococcus aureus (MRSA) transmission in any healthcare setting, including long-term care, is the rigorous and consistent application of contact precautions. This is not merely a task-based activity but a comprehensive strategy. The evidence underscores that MRSA transmission is a significant and persistent challenge within healthcare environments, driven by both patient and environmental reservoirs [1,3]. Implementing strict contact precautions, performing hand hygiene before and after every patient interaction, and dedicating non-critical equipment to a single patient are all essential, non-negotiable components of an evidence-based infection control bundle designed to interrupt the chain of transmission.

Let's analyze why the other options are incorrect and represent a lower standard of care.

Why Option 1 is Incorrect
Applying a topical antibiotic and changing a dressing every 48 hours using "clean technique" is insufficient and potentially harmful. First, MRSA wound management requires sterile technique for dressing changes, not clean technique, to prevent introducing new pathogens into an already compromised wound. Second, the decision to use a topical antibiotic must be guided by culture and sensitivity results, not applied empirically, especially given the complex antibiotic resistance patterns of MRSA ^[3]. A fixed 48-hour dressing change interval is not evidence-based; dressing changes should occur when the dressing is saturated, soiled, or as clinically indicated to maintain a moist wound environment conducive to healing while containing drainage.

Why Option 2 is Incorrect
Irrigating a wound with hydrogen peroxide is contraindicated. Hydrogen peroxide is a cytotoxic agent that indiscriminately destroys healthy granulation tissue and fibroblasts, which are critical for wound healing. This practice would actively delay wound closure. Standard wound cleansing involves irrigation with normal saline at a safe pressure. Furthermore, a dry gauze dressing is not an optimal choice for promoting a moist wound-healing environment, which is the gold standard for most chronic wounds.

Why Option 3 is Incorrect
Using contact precautions only when directly handling the wound is a fundamental misunderstanding of how MRSA is transmitted. Research on MRSA transmission dynamics reveals that the organism can be present on intact skin, in the nares, and on environmental surfaces far beyond the immediate wound site [1,3]. A patient with a confirmed MRSA infection is considered colonized or infected at multiple body sites. Therefore, contact precautions must be maintained for the entire patient encounter and the patient's immediate environment, not just during wound manipulation. Removing gloves immediately after wound care without performing hand hygiene and without considering environmental contamination creates a critical break in infection control practice.

Integrating Infection Control with Wound Healing
The question asks for a strategy that addresses both transmission prevention and wound healing. Option 4 achieves this by creating a safe care environment that allows the wound to heal without the risk of autoinoculation or cross-contamination. The use of dedicated equipment prevents the organism from being transferred to another patient via a shared blood pressure cuff or stethoscope, a concept supported by studies investigating potential MRSA reservoirs on surfaces and among healthcare workers ^[3]. By strictly adhering to this comprehensive contact precaution protocol, the nurse prevents the organism's spread, which is the foundational step that allows any subsequent wound-healing interventions to be effective and safe. The Bayesian modeling of transmission rates in hospitals confirms that consistent, unit-wide adherence to such barrier precautions is essential to controlling the basic reproduction number of HA-MRSA ^[1].