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Doripenem Treatment during Continuous Renal Replacement Therapy.

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This study suggests a 1-gram doripenem dose every 8 hours for septic patients on continuous renal replacement therapy (cRRT). This regimen, potentially with a loading dose, ensures effective drug levels without significant accumulation.

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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.