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Infectious Diseases
문제

A nurse is caring for multiple patients with different infectious diseases. Which patient requires the most stringent isolation precautions and poses the highest risk for healthcare-associated transmission?

해설
C. difficile with severe diarrhea and toxic megacolon poses the highest transmission risk due to spore formation and environmental persistence. Other infections (MRSA, VRE, mild C. diff) have lower environmental resistance or severity.
같은 주제 다음 문제A nurse is caring for a patient with confirmed Clostridioides difficile infection (CDI). W…

심화 해설

Correct Answer: 4

Analysis of the Clinical Scenario

This question tests your ability to prioritize infection control measures based on the virulence of the organism and the severity of the patient's clinical presentation. While all four patients require transmission-based precautions, the patient with Clostridioides difficile infection (CDI) experiencing severe diarrhea with toxic megacolon presents the highest risk for healthcare-associated transmission and requires the most stringent isolation protocol.

Rationale for the Correct Answer

The selection of Patient 4 as the highest priority is based on two compounding factors: the inherent environmental resilience of the pathogen and the magnitude of contamination associated with the patient's clinical status.

First, C. difficile is uniquely equipped to persist in the healthcare environment. A global meta-analysis of environmental contamination found that the overall prevalence of C. difficile contamination in healthcare settings was 0.26 (95% CI 0.23 to 0.28) . Unlike MRSA or VRE, which are susceptible to alcohol-based hand sanitizers, C. difficile forms spores that are resistant to alcohol and many standard hospital-grade disinfectants. This necessitates a strict contact-plus (contact enteric) protocol requiring soap and water for hand hygiene and a sporicidal agent, such as bleach, for environmental cleaning. Failure to adhere to these specific measures directly facilitates spore transmission on the hands of healthcare workers and via contaminated fomites .

Second, the severity of diarrhea directly correlates with the degree of environmental contamination. A patient with severe, fulminant CDI complicated by toxic megacolon will have a high volume of liquid stool, massively contaminating the immediate patient environment with spores. This creates an amplified source of transmission that far exceeds the risk posed by a patient with mild diarrhea (Patient 3) or an infection at a contained site like the urinary tract (Patient 2) or respiratory tract (Patient 1). The systematic review on CDI diagnosis highlights that populations with severe disease require a high index of suspicion, as their presentation represents a failure of the gut barrier and a systemic inflammatory response, leading to a significant bioburden of the organism .

Why the Other Options Are Incorrect

Option 1: A patient with MRSA pneumonia requires contact precautions and, if aerosol-generating procedures are performed, airborne precautions. However, MRSA is effectively killed by alcohol-based hand rubs and does not form spores. The risk of transmission from a respiratory source is generally lower than from massive fecal contamination with a spore-forming organism.

Option 2: A patient with VRE urinary tract infection requires contact precautions. The infectious material is contained within the urinary drainage system, and standard hand hygiene with alcohol-based products is effective against this organism. The transmission risk is localized and manageable with routine contact isolation, lacking the environmental persistence of C. difficile spores.

Option 3: A patient with community-acquired CDI and mild diarrhea certainly requires isolation, but the risk of widespread environmental contamination is significantly lower than that of a patient with severe, fulminant disease. The volume and frequency of infectious stool are key determinants of transmission risk, making this patient a lower priority than Patient 4. The link between antibiotic use, such as the fluoroquinolones mentioned in the context of oncology patients, and CDI is well-established, but the immediate transmission risk is driven by the clinical severity of the diarrhea .

임상 시나리오

Clinical Management of Severe C. difficile Infection

A patient with confirmed Clostridioides difficile infection (CDI) presenting with severe diarrhea and toxic megacolon requires immediate implementation of stringent isolation and clinical intervention to prevent healthcare-associated transmission and manage systemic toxicity.

Isolation and Infection Control
  • Initiate Contact-Enteric Precautions immediately. Place the patient in a private room with a dedicated toilet or commode.
  • Hand Hygiene: Mandatory use of soap and water for all individuals entering the room. Alcohol-based hand rubs are ineffective against C. difficile spores.
  • Personal Protective Equipment (PPE): Don gown and gloves upon entry. Ensure proper doffing sequence to avoid self-contamination.
  • Environmental Cleaning: Disinfect all high-touch surfaces with a sporicidal agent, such as a 1:10 dilution of sodium hypochlorite (bleach). Standard disinfectants do not kill spores.
Nursing Assessment and Monitoring
  • Monitor for signs of systemic toxicity: fever, tachycardia, hypotension, and altered mental status.
  • Assess abdomen frequently for worsening distension, rigidity, or rebound tenderness, indicating possible perforation.
  • Strict intake and output monitoring to manage severe fluid and electrolyte losses from diarrhea and third-spacing.
  • Monitor serum electrolytes, particularly potassium and magnesium, and replace aggressively per orders.
Collaborative Management
  • Discontinue the offending antibiotic agent if possible, in consultation with the provider.
  • Administer oral vancomycin or fidaxomicin as prescribed; note that antiperistaltic agents are contraindicated as they may precipitate toxic megacolon.
  • Prepare for surgical consultation if the patient fails to improve or develops signs of perforation; subtotal colectomy may be indicated.
  • Maintain strict documentation of stool frequency, consistency, and volume to evaluate treatment response.

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