Vancomycin dosing design method considering risk factors for nephrotoxicity

Area of Science:

• Pharmacology
• Nephrology
• Clinical Pharmacy

Background:

• Vancomycin (VCM) nephrotoxicity is a significant concern, occurring in a dose-dependent manner.
• Patients with pre-existing risk factors are susceptible to VCM-induced kidney damage even within therapeutic ranges.
• Individualized dosing strategies are crucial for optimizing VCM therapy and mitigating adverse events.

Purpose of the Study:

• To assess the risk of VCM-induced nephrotoxicity using logistic regression curves.
• To differentiate between high-risk and low-risk patient groups based on nephrotoxicity risk factors.
• To establish appropriate AUCss (area under the concentration-time curve) thresholds for each patient group.

Main Methods:

• Multivariate logistic regression analysis identified key risk factors for nephrotoxicity.
• CART analysis and ROC curves determined the optimal AUCss thresholds.
• Logistic regression examined the relationship between AUCss and nephrotoxicity probability in distinct risk groups.

Main Results:

• Nephrotoxicity incidence was significantly higher in the high-risk group (31.7%) compared to the low-risk group (13.0%).
• Recommended AUCss thresholds were 575 mg·h/L for high-risk and 650 mg·h/L for low-risk patients.
• Target concentration ranges were proposed: 400–500 mg·h/L for high-risk and 400–650 mg·h/L for low-risk patients.

Conclusions:

• Quantitative analysis of AUCss-specific nephrotoxicity risk was performed for both high- and low-risk groups.
• Individualized target AUCss concentrations are proposed to balance therapeutic efficacy and nephrotoxicity prevention.
• This approach supports strategic VCM dosing tailored to individual patient risk profiles.