Related Experiment Video
Updated: Apr 22, 2026
Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
Published on: February 9, 2011
Targeted Antimicrobial Stewardship in a Pediatric Intensive Care Unit: Using the Methicillin-Resistant Staphylococcus
Bailey Bridges1, Sara Jones1, Whitney Mays1
1Department of Pharmacy, University of Mississippi Medical Center, Jackson, Mississippi, USA.
Background:
Vancomycin is commonly used in pediatric intensive care units (PICUs) to treat methicillin-resistant Staphylococcus aureus (MRSA) infections. While previous interventions in children's hospitals have successfully targeted vancomycin use, few have incorporated MRSA nasal polymerase chain reaction (PCR) testing. The MRSA PCR has been shown to reliably rule out MRSA infection and reduce vancomycin therapy duration in adults, but data in children are limited. This study aimed to evaluate the impact of an antimicrobial stewardship intervention on vancomycin use.
Methods:
This retrospective study included patients less than 18 years old who received vancomycin in the PICU between January 1, 2019 and June 30, 2024. The primary outcome was vancomycin days of therapy (DOT) before and after the antimicrobial stewardship intervention. Secondary outcomes included acute kidney injury (AKI), hospital length of stay, and MRSA PCR sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV).
Results:
A total of 251 patients were included, with 126 in the pre-group and 125 in the post-group. The median age was 2 years, and 60% were mechanically ventilated. The most common indication for vancomycin was sepsis of unknown origin (47%). The median vancomycin DOT was 4 days in both groups (p = 0.033). In patients without confirmed MRSA infection, the median duration was shorter in the post-group (4 vs. 3 days, p = 0.009). More patients in the post-group had vancomycin discontinued at 72 h (38.9% vs. 61.6%, p < 0.001). No significant differences were observed in secondary outcomes. The MRSA PCR sensitivity, specificity, PPV, and NPV were 66.7%, 92.7%, 34.5%, and 98.3%, respectively.
Conclusions:
This intervention in PICU patients at an academic medical center led to more rapid vancomycin discontinuation and shorter DOT. The MRSA PCR demonstrated a high NPV, supporting its use as an antimicrobial stewardship tool.
Insights
An antimicrobial stewardship intervention in pediatric intensive care units (PICUs) reduced vancomycin therapy duration. Methicillin-resistant Staphylococcus aureus (MRSA) nasal PCR testing proved valuable, especially with its high negative predictive value (NPV).
Area of Science:
- Infectious Diseases
- Pediatric Critical Care
- Antimicrobial Stewardship
Background:
- Vancomycin is a critical antibiotic for treating methicillin-resistant Staphylococcus aureus (MRSA) infections in pediatric intensive care units (PICUs).
- Previous interventions have optimized vancomycin use, but few integrated MRSA nasal polymerase chain reaction (PCR) testing.
- MRSA nasal PCR's utility in reducing vancomycin duration in pediatric patients requires further investigation.
Purpose of the Study:
- To evaluate the impact of an antimicrobial stewardship intervention on vancomycin utilization in PICU patients.
- To assess the role of MRSA nasal PCR testing as part of the stewardship intervention.
Main Methods:
- Retrospective study of pediatric patients (<18 years) receiving vancomycin in the PICU from January 2019 to June 2024.
- Primary outcome: vancomycin days of therapy (DOT) before and after the intervention.
- Secondary outcomes: acute kidney injury (AKI), hospital length of stay, and MRSA PCR performance (sensitivity, specificity, PPV, NPV).
Main Results:
- A total of 251 patients were analyzed (126 pre-intervention, 125 post-intervention).
- The intervention group showed a shorter median vancomycin duration in patients without confirmed MRSA infection (3 vs. 4 days) and increased discontinuation by 72 hours (61.6% vs. 38.9%).
- MRSA PCR demonstrated high specificity (92.7%) and negative predictive value (98.3%), though sensitivity (66.7%) and PPV (34.5%) were lower.
Conclusions:
- The antimicrobial stewardship intervention successfully accelerated vancomycin discontinuation and reduced overall DOT in PICU patients.
- MRSA nasal PCR testing, particularly its high NPV, is a valuable tool for antimicrobial stewardship, aiding in ruling out MRSA infections.
- Further research may explore optimizing MRSA PCR utilization to improve sensitivity and PPV in pediatric populations.
Related Concept Videos
01:25Clinical Significance of Antibiotic Resistance
01:25Mechanism of Antibiotic Resistance in MRSA
01:26Pharmacokinetics in Pediatric Patients: Drug Excretion
01:28Antimicrobial Effectiveness