1. Comparison of vancomycin area under the concentration‐time curve (AUC) using two‐point pharmacokinetics versus two open‐access online single‐concentration vancomycin calculators.
- Author
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Ondrush, Nicole M., Ademovic, Rejs, Seabury, Robert W., Darko, William, Miller, Christopher D., and Mogle, Bryan T.
- Subjects
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ANTIBIOTICS , *STATISTICS , *STATISTICAL significance , *PREDICTIVE tests , *METHICILLIN-resistant staphylococcus aureus , *VANCOMYCIN , *RETROSPECTIVE studies , *MANN Whitney U Test , *STAPHYLOCOCCAL diseases , *DESCRIPTIVE statistics , *DATA analysis , *STATISTICAL correlation , *DATA analysis software , *MICROBIAL sensitivity tests , *LONGITUDINAL method - Abstract
What Is Known and Objective: Current vancomycin monitoring guidelines recommend the use of area under the concentration‐time curve (AUC24) monitoring in patients with serious Methicillin‐Resistant Staphylococcus aureus (MRSA) infections by utilizing either a Bayesian approach or first‐order analytic equations. Several open‐access websites exist that allow estimation of vancomycin AUC24 with the use of a single steady‐state concentration. It is uncertain how these open‐access calculators perform against guideline‐recommended methods. The objective was to compare AUC24 estimates from two online, open‐access, single‐concentration vancomycin calculators compared with the two‐point pharmacokinetic (2PK) method. Methods: AUC24 estimates were made using the 2PK reference method and the single‐concentration vancomycin calculators, ClinCalc and VancoPK. The AUC24 estimates from the 2PK reference method were compared to the online calculators by assessing bias (median AUC24 difference) and precision (AUC24 difference ± 100 mg*h/L). Clinical precision was also assessed by characterizing the frequency that the 2PK reference method and the online calculators showed clinical disagreement based on the following AUC24 categories: (1) AUC24 < 400 mg*h/L; (2) AUC24 400–600 mg*h/L and (3) AUC24 > 600 mg*h/L. Results and Discussion: A total of 253 patients were included in the study. The AUC24 estimates from the ClinCalc and VancoPK single‐concentration vancomycin calculators showed some bias and imprecision, though VancoPK appeared to have less. Clinical disagreement versus the 2PK reference method occurred in 31.2% and 19.4% of AUC24 estimates from the ClinCalc and VancoPK single‐concentration vancomycin calculators, suggesting clinical imprecision. What Is New and Conclusion: The AUC24 estimates from single‐concentration, online vancomycin calculators showed some bias and imprecision in comparison to the 2PK method. Institutions should validate these online, trough‐only calculators relative to a 2PK method in their patient populations prior to adoption as standard‐of‐care. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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