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2016 ; 36
(7
): 731-9
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Comparison of Linezolid and Vancomycin for Methicillin-Resistant Staphylococcus
aureus Pneumonia: Institutional Implications
#MMPMID27208687
Tong MC
; Wisniewski CS
; Wolf B
; Bosso JA
Pharmacotherapy
2016[Jul]; 36
(7
): 731-9
PMID27208687
show ga
OBJECTIVE: Recent studies suggesting clinical superiority of linezolid over
vancomycin in the treatment of methicillin-resistant Staphylococcus aureus (MRSA)
pneumonia led to a change in our institution's clinical pathway/order form for
hospital-acquired pneumonia, positioning linezolid as the preferred agent. Our
objective was to assess the impact of this change within our institution. DESIGN:
Retrospective electronic medical records review. METHODS: The analysis for this
observational study included eligible patients admitted to our medical center
between May 1, 2011, and August 31, 2014, with ICD-9 codes for MRSA and
pneumonia. Included patients were at least 18 years of age and had vancomycin or
linezolid initiated at least 2 days after admission and continued for at least 2
consecutive days. The primary end points were extent of antibiotic use before and
after order form change and length of stay (LOS) and hospital charges in the two
treatment groups. A secondary aim was to detect any gross discrepancies in
patient outcomes such as treatment duration, mechanical ventilation duration,
all-cause mortality rate, nephrotoxicity, and 30-day readmission between the two
treatment groups. MEASUREMENTS AND MAIN RESULTS: Outcomes in 227 patients were
assessed. Linezolid use increased 16.2% subsequent to the change in the order
form. Although not statistically significant, the median hospital admission
charge was $6200 lower in patients treated with linezolid compared with those
treated with vancomycin ($25,900 vs $32,100). Hospital LOS was significantly
associated with Charlson Comorbidity Index score (p<0.001), type of treatment
(p=0.032), duration of treatment (p<0.001), mechanical ventilation (p<0.001), and
intensive care unit admission (p<0.001). All-cause mortality favored linezolid
treatment, and these patients were more likely to be discharged (shorter LOS).
CONCLUSIONS: Although linezolid use increased markedly with this pathway/order
form change, no negative institutional consequences or unfavorable patient
outcomes were detected, justifying the change in policy from these perspectives.