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Given the lack of clinical data to guide optimal dosing of vancomycin in critically ill patients with life-threatening infections, the objective was to characterise vancomycin pharmacodynamics in MRSA-associated septic shock. Cases were extracted from an observational, multicentre study in Canadian Intensive Care Units and included 35 adult patients with MRSA-associated septic shock who received vancomycin and had a measured serum concentration within the first 72h of therapy. Univariate and multivariate analyses were used to assess variables predictive of in-hospital mortality. Patients who survived were significantly younger and had better renal function, lower probability of chronic obstructive pulmonary disease, higher probability of intravenous drug use, lower probability of healthcare-associated infection and lower APACHE II score. Survivors also received higher vancomycin doses and had higher serum …