Pharmacodynamics of empirical antibiotic monotherapies for an intensive care unit (ICU) population based on Canadian surveillance data
Bibliographic record
Abstract
OBJECTIVES: To evaluate, using Monte Carlo simulation, the pharmacodynamics (PD) of empirical antibiotic monotherapies for serious infections consistent with Canadian intensive care unit (ICU) surveillance data. METHODS: Meropenem, piperacillin/tazobactam and cefepime, along with ceftobiprole, a broad-spectrum cephalosporin active against methicillin-resistant Staphylococcus aureus (MRSA), were tested at standard and highest recommended doses with and without prolonged infusion times (t'). Population pharmacokinetic models were used to simulate antibiotic serum concentrations (n = 5000). Cumulative target attainment (CTA) at >50%, >75% and 100% fT( > MIC) (percentage of time free concentrations exceed the MIC) targets were determined based on ICU surveillance data including 4798 pathogens, most commonly methicillin-susceptible S. aureus (20.1%), Escherichia coli (15.2%) and Pseudomonas aeruginosa (12.3%). RESULTS: With standard doses, ceftobiprole (500 mg every 8 h, t' 2 h) had 0.90 CTA at the >50% fT( > MIC) target while meropenem (1 g every 8 h, t' 0.5 h), piperacillin/tazobactam (3.375 g every 6 h, t' 0.5 h) and cefepime (2 g every 12 h, t' 0.5 h) reached >50% fT( > MIC) in 0.79-0.82 of the population (0.84-0.88 when MRSA was excluded). Piperacillin/tazobactam had the largest reduction in CTA at the >75% and 100% fT( > MIC) targets requiring prolonged infusions to maintain comparable PD. For all agents, prolonged infusions and/or high doses were required to achieve >0.9 CTA at the lowest target, to reach higher targets or to cover less susceptible pathogens such as P. aeruginosa. CONCLUSIONS: This study provides important comparative data on empirical antibiotic monotherapies in an ICU setting including preliminary data on ceftobiprole. Ceftobiprole was most active overall, but similar to meropenem, piperacillin/tazobactam (lowest target only) and cefepime when MRSA was excluded. Prolonged infusions in particular and high doses were effective at improving antibiotic PD.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".