Optimising Meropenem and Piperacillin Dosing in Patients Undergoing Extracorporeal Membrane Oxygenation Without Renal...

Area of Science:

• Pharmacology
• Critical Care Medicine
• Infectious Diseases

Background:

• Antibiotic pharmacokinetics (PK) and pharmacodynamics (PD) are significantly altered in patients undergoing extracorporeal membrane oxygenation (ECMO).
• Meropenem and piperacillin are frequently used antibiotics in this critically ill population.
• Limited guidance exists for adjusting antibiotic dosages in ECMO patients.

Purpose of the Study:

• To evaluate meropenem and piperacillin concentrations in ECMO patients.
• To identify clinical, physiological, and mechanical factors affecting antibiotic exposure.
• To assess the achievement of PK/PD targets for these antibiotics in the ECMO setting.

Main Methods:

• Retrospective, single-centre, observational study comparing an ECMO cohort with a non-renal dysfunction control group.
• Analysis of demographic, clinical, PK/PD, and ECMO-related data.
• Univariate and generalized estimating equations used for analysis, with a PK/PD target of 100%fT>4xMIC.

Main Results:

• 130 critically ill patients included (18 ECMO, 112 control).
• Meropenem exposure was influenced by renal function and ECMO support, achieving PK/PD targets in 67% of measurements.
• Piperacillin exposure showed high variability, driven by renal function and mechanical ventilation, with targets met in only 20% of measurements.

Conclusions:

• Significant variability exists in β-lactam antibiotic exposure and PK/PD target attainment in critically ill patients.
• Therapeutic drug monitoring and individualized dosing are crucial for optimizing antimicrobial efficacy in ECMO patients.
• Improved patient outcomes may be achieved through tailored antibiotic strategies in this complex patient group.