Journal List > Korean J Nosocomial Infect Control > v.19(2) > 1098344

Eun-seo, Hae-jin, Yu, Su, Kyung, Jeong, Yun, Jin, You, and You: The Rate of Nasal Colonization of Methicillin-resistant Staphylococcus aureus at Admission to Intensive Care Units in a Secondary Hospital: The Importance of Nasogastric Tube

Abstract

Background

Methicillin-resistant Staphylococcus aureus (MRSA) nasal colonization has been known as a predictor of intensive care unit (ICU)-acquired MRSA infections. We performed this study to survey the nasal colonization of MRSA among the patients admitted to an ICU and analyze risk factors associated with the colonization.

Methods

A retrospective 1 : 1 matched case-control study was conducted with patients admitted to the ICU from March to December 2010 at Samsung Changwon Hospital.

Results

A total of 602 patients among 846 patients admitted to the ICU during the study period were evaluated. The prevalence of nasal MRSA colonization was 67 (11.1%) of 602. Other factors, including underlying renal disease (odds ratio [OR]=12.37, 95% confidence interval [CI] 3.60-42.54; Pä.001), MRSA infection within the previous 3 months (OR=7.43, 95% CI 1.31-42.05; P=0.023), nursing home resident within the previous 1 month (OR=6.25, 95% CI 1.82-21.53; P=0.004), surgical procedure within the previous 1 month (OR=5.93, 95% CI 1.86-18.85; P=0.003), and current use of nasogastric tube (OR=4.98, 95% CI 1.84-13.45; P=0.002) were independently associated with nasal MRSA colonization in patients admitted to ICU.

Conclusion

A significant number of patients admitted to the ICU in a secondary hospital were colonized with MRSA. The present study showed the possible impact of the presence of a nasogastric tube on the nasal colonization by MRSA. More effective infection control procedures must be developed for patients with nasogastric tube use.

References

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Fig. 1.
Description of the study population.
kjnic-19-37f1.tif
Table 1.
Characteristics of MRSA nasal carrier and non-carrier
Factors MRSA nasal carrier(N=67) MRSA nasal non-carrier(N=67) P-value
Age, mean (SD) 64.4816.30 64.4014.76 0.978
Male, n (%) 42 (62.7) 47 (70.1) 0.360
Underlying disease, n (%)      
Solid cancer 20 (29.9) 18 (26.9) 0.436
Chronic lung disease 21 (31.3) 18 (26.9) 0.568
Liver cirrhosis 11 (16.4) 13 (19.4) 0.652
Congestive heart failure 29 (43.3) 14 (20.9) 0.006
Neurological disease 33 (49.3) 20 (29.9) 0.022
Diabetes 28 (41.8) 17 (25.4) 0.044
Renal disease 27 (40.3) 5 (7.5) ä0.001
Neutropenia 2 (3.0) 0 (0.0) 0.154
Splenectomy status 1 (1.5) 0 (0.0) 0.315
Tracheotomy status, n (%) 4 (6.0) 1 (1.5) 0.172
MRSA infection within previous 3 months, n (%) 10 (14.9) 2 (3.0) 0.016
Hospitalization for over 48 h within 3 months, n (%) 33 (49.3) 21 (31.3) 0.035
Previous history within 1 month, n (%)      
Nursing home resident 18 (26.9) 9 (13.4) 0.050
Dialysis 6 (9.0) 0 0.028
Surgery 20 (29.9) 6 (9.0) 0.002
Steroid use 12 (17.9) 14 (20.9) 0.662
Gastrointestinal bleeding 6 (9.0) 13 (19.4) 0.083
Antibiotic therapy 50 (74.6) 57 (85.1) 0.132
Indwelling catheter, n (%) 62 (92.5) 62 (92.5) 1.000
Central venous catheter 41 (61.2) 35 (52.2) 0.296
Dual lumen catheter 5 (7.5) 3 (4.5) 0.466
Urinary catheter 59 (88.1) 55 (82.1) 0.332
Nasogastric tube 39 (58.2) 25 (37.3) 0.015
Other catheter 16 (23.9) 16 (23.9) 1.000
Table 2.
Risk factors of MRSA nasal carrier using logistic regression analysis
Factors Odds ratio(95% CI) P-value Adjusted Odds ratio(95% CI) P-value
Congestive heart failure 2.89 (1.35-6.19) 0.006    
Neurological disease 2.28 (1.12-4.64) 0.023    
Renal disease 8.37 (2.98-23.53) ä0.001 12.37 (3.60-42.54) ä0.001
Diabetes 2.11 (1.10-4.40) 0.046    
MRSA infection within previous 3 months 5.70 (1.20-27.11) 0.029 7.43 (1.31-42.05) 0.023
Nursing home resident within previous 1 month 2.37 (1.00-5.74) 0.050 6.25 (1.82-21.53) 0.004
Operation history within previous 1 month 4.33 (1.61-11.63) 0.004 5.93 (1.86-18.85) 0.003
Nasogastric tube 2.34 (1.17-4.68) 0.016 4.98 (1.84-13.45) 0.002

Hosmer-Lemeshow statistic, χ2=5.435, P=0.607.

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