A 7-year-old child is brought to the emergency department with a rapidly spreading skin infection. The nurse is assessing for signs of community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA). Which assessment finding would be MOST characteristic of CA-MRSA skin infection in this child?
1Multiple small vesicles with clear fluid on the extremities
2Large, painful, pus-filled lesions with surrounding erythema and induration✓ 정답
3Dry, scaly patches with well-defined borders on the trunk
4Small, painless nodules with central umbilication
해설
CA-MRSA skin infections are most characterized by large, painful, pus-filled lesions with erythema and induration. Other options describe different skin conditions.
Clinical Judgment
The core of this question is applying the 'Recognize Cues' and 'Prioritize Hypotheses' stages of the Clinical Judgment Measurement Model (CJMM). In a CA-MRSA infection, the most dangerous aspect is not the localized infection but sepsis that has spread systemically. In option 3, the fever (102.8°F), altered mental status, and hypotension are classic signs of SIRS (Systemic Inflammatory Response Syndrome), strongly suggesting sepsis. This is a medical emergency requiring immediate life-sustaining interventions. The other options are merely signs of a localized infection.
Memory Tip: To remember the danger signals of CA-MRSA, think "Systemic signs over Local signs." Systemic signs (fever, hypotension, altered mental status) always take priority over local signs (pain, redness, abscess).
KR vs US
In Korea, there may be a more cautious approach to fluid administration during the initial management of a sepsis patient, but in the US NGN/NCLEX, the standard when the triad of hypotension, high fever, and altered mental status appears is to immediately report and begin aggressive resuscitation, including fluid administration. A 'wait-and-see' approach is never correct.
Clinical Assessment of CA-MRSA Skin Infections
Community-associated MRSA typically presents as a purulent skin and soft tissue infection (SSTI). The classic presentation is an abscess or furuncle that the patient or caregiver often initially mistakes for a spider bite.
Key Assessment Findings
Primary Lesion: Large, painful, pus-filled nodule or mass.
Surrounding Tissue: Erythema, warmth, and induration extending from the central lesion.
Pain: Disproportionate tenderness due to intense inflammation and tissue pressure.
Location: Commonly occurs on areas prone to friction or minor trauma, such as the extremities, axillae, and buttocks.
Differential Diagnosis Considerations
Insect Bite Reaction: Often the initial misdiagnosis; however, insect bites lack the progressive enlargement and significant induration of an abscess.
Herpes Simplex/Varicella: Presents with grouped vesicles on an erythematous base, not a single large purulent nodule.
Molluscum Contagiosum: Small, dome-shaped, painless papules with central umbilication, lacking erythema and pus.
Nursing Actions
Infection Control: Immediately initiate contact precautions. Use gloves and gown for all patient contact. Ensure the wound is covered with a clean, dry dressing.
Wound Culture: Obtain a sample of purulent drainage, not a superficial swab, for culture and sensitivity testing to confirm MRSA and guide antibiotic therapy.
Incision and Drainage (I&D): Prepare the patient for this primary treatment. I&D alone may be curative for small abscesses without systemic symptoms.
Patient Education: Instruct the family on strict hand hygiene, avoiding sharing personal items (towels, razors), and laundering clothes and linens in hot water.
Warning Signs for Hospitalization
Evaluate for systemic involvement requiring inpatient management: fever >38.5°C, tachycardia, rapid lesion progression, inability to tolerate oral antibiotics, or failure of outpatient I&D.
Panton-Valentine leukocidin (PVL) — A cytotoxin produced by certain Staphylococcus aureus strains, including CA-MRSA, that creates pores in leukocyte membranes, leading to tissue necrosis and pus formation.
Purulent skin and soft tissue infection (SSTI) — An infection of the skin and underlying soft tissues characterized by the presence of pus, commonly presenting as abscesses, furuncles, or carbuncles.
Induration — A hardened, firm area of soft tissue resulting from inflammation, edema, or cellular infiltration, often palpable at the periphery of an abscess.
Community-associated MRSA (CA-MRSA) — Methicillin-resistant Staphylococcus aureus infections occurring in otherwise healthy individuals without recent healthcare exposure, often presenting as skin abscesses.