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Risk factors for methicillin-resistant Staphylococcus aureus (MRSA) infection in a Japanese geriatric hospital
Abstract:
A case control study on MRSA infection was carried out, with the purpose of evaluating the effect of age, gender, hypoalbuminemia, the limitation of activities of daily living (ADL), the administration of antibiotics and the use of the new cephems which include third generation cephalosporins and monobactam and carbapenems, on the occurrence of MRSA infection among the inpatients in a geriatric hospital. From April 1991 to March 1994, 285 patients underwent a bacterial culture in the various clinical aspects. 118 patients were positive for MRSA, who were then used as cases while 167 patients who were negative for MRSA were used as controls. The level of serum albumin and the ADL score were lower in the MRSA group than in the non-MRSA group (P < 0.01) while the number of antibiotics administered before bacterial culture was greater in the MRSA group than in the non-MRSA group (P < 0.01). The third generation cephems were more commonly used in the MRSA positive patients than the negative patients (P < 0.01). Even after controlling for the other factors, hypoalbuminemia (OR = 1.73, 95% CI = 1.27-2.36), the limited ADL (partially limited vs without limitation: OR = 1.88, 95% CI = 1.19-2.96, completely limited vs without limitation: OR = 2.50, 95% CI = 1.64-3.82), the use of antibiotics other than the third generation cephems (vs without antibiotics: OR = 1.73, 95% CI = 1.20-2.50) and the administration of the third generation cephems (vs without antibiotics: OR = 3.12, 95% CI = 2.16-4.50) increased the risk of MRSA infection.
Insights
Low serum albumin, limited daily living activities, and antibiotic use, particularly third-generation cephalosporins, significantly increase the risk of methicillin-resistant Staphylococcus aureus (MRSA) infection in geriatric hospital patients.
Area of Science:
- Geriatric Medicine
- Infectious Diseases
- Hospital Epidemiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in healthcare settings, especially among vulnerable geriatric populations.
- Identifying risk factors for MRSA infection is crucial for implementing effective prevention strategies in hospitals.
Purpose of the Study:
- To evaluate the impact of various factors on the occurrence of MRSA infection in hospitalized elderly patients.
- Specifically investigate the roles of hypoalbuminemia, limitations in activities of daily living (ADL), and antibiotic use, including third-generation cephalosporins.
Main Methods:
- A case-control study was conducted involving 285 geriatric inpatients from April 1991 to March 1994.
- 118 MRSA-positive patients (cases) were compared with 167 MRSA-negative patients (controls).
- Data collected included serum albumin levels, ADL scores, and antibiotic administration history.
Main Results:
- MRSA-positive patients exhibited lower serum albumin levels and ADL scores compared to controls (P < 0.01).
- A higher number of antibiotics were administered to MRSA-positive patients prior to bacterial culture (P < 0.01).
- Increased risk of MRSA infection was associated with hypoalbuminemia (OR=1.73), limited ADL (OR=1.88-2.50), non-cephalosporin antibiotics (OR=1.73), and third-generation cephalosporins (OR=3.12).
Conclusions:
- Hypoalbuminemia, functional decline (limited ADL), and the use of certain antibiotics, especially third-generation cephalosporins, are significant independent risk factors for MRSA infection in geriatric inpatients.
- These findings highlight the need for targeted interventions to mitigate MRSA risk in this population.