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Age-Related Differences in Vancomycin-Associated Nephrotoxicity and Efficacy in Methicillin-Resistant Staphylococcus

Lin Xi1,2,3, Shanshan Li4, Mengting Chen1,2,3

  • 1Institute of Antibiotics, Huashan Hospital, Fudan University, Shanghai 200040, China.

Antibiotics (Basel, Switzerland)
|April 26, 2024
PubMed

Insights

Elderly patients are at higher risk of vancomycin-induced kidney damage (nephrotoxicity) from methicillin-resistant Staphylococcus aureus (MRSA) infections. Close monitoring of vancomycin trough concentrations (Ctrough) is crucial, especially above 20 mg/L.

Area of Science:

  • Pharmacology
  • Nephrology
  • Infectious Diseases

Background:

  • Elderly patients (≥ 65 years) are more vulnerable to methicillin-resistant Staphylococcus aureus (MRSA) infections.
  • MRSA infections in the elderly can lead to worse treatment outcomes and complications compared to younger adults.
  • Vancomycin is a critical antibiotic for treating MRSA, but its use in the elderly requires careful management.

Purpose of the Study:

  • To compare vancomycin-associated nephrotoxicity and efficacy between elderly and adult patients with MRSA infections.
  • To investigate the relationship between vancomycin pharmacokinetic/pharmacodynamic (PK/PD) indices and clinical outcomes in different age groups.
  • To identify risk factors for vancomycin-induced nephrotoxicity in elderly patients.

Main Methods:

  • A prospective study involving 164 patients (83 elderly, 81 adult) with MRSA infections across 10 hospitals in Shanghai (October 2012–November 2019).
  • Vancomycin therapeutic drug monitoring (TDM) was conducted for all patients.
  • PK/PD indices, including vancomycin trough concentrations (Ctrough) and 24-h area under the curve (AUC24), were analyzed and correlated with clinical outcomes and nephrotoxicity.

Main Results:

  • Elderly patients exhibited significantly higher vancomycin Ctrough, AUC24, and AUC24/MIC values compared to adult patients.
  • The incidence of vancomycin-associated nephrotoxicity was nearly three times higher in elderly patients (18.1%) than in adult patients (6.2%, p = 0.020).
  • A Ctrough > 20 mg/L was identified as an independent risk factor for nephrotoxicity in the elderly. Even in patients with eGFR > 60 mL/min/1.73 m², elderly patients showed higher vancomycin PK/PD indices and nephrotoxicity.

Conclusions:

  • Elderly patients receiving vancomycin therapy have an elevated risk of nephrotoxicity.
  • Close therapeutic drug monitoring of vancomycin is essential in elderly patients, particularly when Ctrough levels exceed 20 mg/L.
  • Optimizing vancomycin dosing and monitoring strategies is crucial to mitigate nephrotoxicity risk in the aging population.
Keywords:
AUC24adult patientselderly patientsnephrotoxicitytrough concentrationvancomycin

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