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Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus MRSA in Rat
Published on: June 4, 2012
Methicillin Resistance Increased the Risk of Treatment Failure in Native Joint Septic Arthritis Caused by
Jungok Kim1,2, So Yeon Park3, Kyung Mok Sohn2
1Division of Infectious Diseases, Department of Internal Medicine, Chungnam National University Sejong Hospital, Sejong 30099, Republic of Korea.
Abstract:
This study aimed to compare clinical characteristics and outcomes in patients with native joint septic arthritis (NJSA) due to methicillin-resistant Staphylococcus aureus (MRSA) in comparison to methicillin-sensitive S. aureus (MSSA) and identify treatment failure risk factors. We conducted a multi-center retrospective study on adult NJSA patients at three teaching hospitals in South Korea from 2005 to 2017. Among 101 patients diagnosed with S. aureus NJSA, 39 (38.6%) had MRSA strains. Compared to MSSA, patients with MRSA had a higher prevalence of nosocomial infections (17.9% vs. 1.6%; p = 0.005) and received inappropriate antibiotics within 48 h more frequently (74.4% vs. 0%; p < 0.001). In total, twenty patients (19.8%) experienced treatment failure, which encompassed five patients (5.0%) who passed away, nine (8.9%) requiring repeated surgical drainage after 30 days of antibiotic therapy, and seven (6.9%) with relapse. The MRSA group showed a higher rate of overall treatment failure (33.3% vs. 11.3%; p = 0.007) with a notably increased frequency of requiring repeated surgical interventions after 30 days of antibiotic therapy (17.9% vs. 3.2%, p = 0.026), in contrast to the MSSA group. Independent risk factors for treatment failure included Charlson comorbidity score, elevated CRP levels, and methicillin resistance. Methicillin resistance is an independent risk factor for treatment failure, emphasizing the need for vigilant monitoring and targeted interventions in MRSA-related NJSA cases.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) causes more treatment failures in native joint septic arthritis (NJSA) than methicillin-sensitive strains. Methicillin resistance is a key risk factor for treatment failure in NJSA patients.
Area of Science:
- Infectious Diseases
- Orthopedic Surgery
- Clinical Microbiology
Background:
- Native joint septic arthritis (NJSA) is a severe infection requiring prompt treatment.
- Staphylococcus aureus is a common pathogen in NJSA, with increasing prevalence of methicillin-resistant strains (MRSA).
- Understanding differences between MRSA and methicillin-sensitive S. aureus (MSSA) NJSA is crucial for optimizing patient outcomes.
Purpose of the Study:
- To compare clinical characteristics and treatment outcomes of NJSA caused by MRSA versus MSSA.
- To identify independent risk factors for treatment failure in S. aureus NJSA.
Main Methods:
- Multi-center retrospective study of adult NJSA patients from 2005-2017 in South Korea.
- Comparison of clinical data and treatment outcomes between MRSA and MSSA infected patients.
- Statistical analysis to identify independent risk factors for treatment failure.
Main Results:
- Of 101 S. aureus NJSA patients, 39% were MRSA.
- MRSA patients had higher rates of nosocomial infections and received inappropriate initial antibiotics.
- Overall treatment failure occurred in 19.8% of patients, with higher rates in the MRSA group (33.3% vs. 11.3%).
- MRSA was an independent risk factor for treatment failure, including increased need for repeated surgical interventions.
Conclusions:
- Methicillin resistance in Staphylococcus aureus is an independent risk factor for treatment failure in native joint septic arthritis.
- MRSA-NJSA cases require vigilant monitoring and targeted therapeutic strategies.
- Clinical characteristics and outcomes differ significantly between MRSA and MSSA NJSA, necessitating distinct management approaches.
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