Doripenem Treatment during Continuous Renal Replacement Therapy.

Area of Science:

• Pharmacology
• Critical Care Medicine
• Nephrology

Background:

• Doripenem dosing for continuous renal replacement therapy (cRRT) lacks updated data.
• Previous recommendations were based on nonseptic patients and may use suboptimal target concentrations.
• Septic patients on cRRT require optimized doripenem dosing for effective treatment.

Purpose of the Study:

• To determine optimal doripenem dosing for septic patients undergoing cRRT.
• To evaluate doripenem pharmacokinetics and pharmacodynamics in this patient population.
• To propose updated dosing recommendations for doripenem in critically ill patients on cRRT.

Main Methods:

• A pharmacokinetic study involving 13 oliguric septic patients on cRRT.
• Patients received 1 gram of doripenem every 8 hours via hemodiafiltration, hemodialysis, or hemofiltration.
• Plasma and ultrafiltrate doripenem concentrations were measured over 48 hours.

Main Results:

• Mean hemofilter clearance was 36.53 ml/min; mean volume of distribution was 59.26 liters.
• Steady-state trough levels averaged 8.5 mg/liter with no significant accumulation.
• The proposed 1 g q8h regimen achieved therapeutic drug concentrations.

Conclusions:

• A doripenem dosage of 1 g every 8 hours is recommended for septic patients on cRRT.
• A loading dose of 1.5 to 2 g may be beneficial for critically ill patients.
• Updated dosing ensures effective antibiotic therapy in this vulnerable patient group.