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Related Experiment Videos

Increased aminoglycoside dosage requirements in hematologic malignancy.

R G Zeitany1, N S El Saghir, C R Santhosh-Kumar

  • 1Department of Clinical Pharmacy, King Khalid University Hospital, Riyadh, Saudi Arabia.

Antimicrobial Agents and Chemotherapy
|May 1, 1990
PubMed
Summary

Aminoglycoside dosing in hematologic malignancy patients is often underestimated. This study found altered pharmacokinetics, necessitating higher doses for optimal therapeutic drug concentrations in these vulnerable patients.

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Area of Science:

  • Pharmacology
  • Oncology
  • Infectious Disease

Background:

  • Aminoglycosides are critical antibiotics for febrile neutropenia in hematologic malignancies.
  • Standard dosing may be inadequate due to altered drug disposition in these patients.

Purpose of the Study:

  • To prospectively evaluate aminoglycoside pharmacokinetics in patients with hematologic malignancy and fever with neutropenia.
  • To compare these parameters with a control group and identify factors influencing drug disposition.

Main Methods:

  • Prospective pharmacokinetic study in 27 hematologic malignancy patients and 18 controls.
  • One-compartment model analysis using linear regression (Sawchuk et al.).
  • Correlation analysis with clinical and laboratory parameters.

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Main Results:

  • Significantly higher volume of distribution and clearance, with shorter half-life and faster elimination rate in malignancy patients.
  • Bone marrow blast cell percentage correlated with increased clearance (R2=36.98%).
  • Stage IV lymphomas showed increased clearance compared to lower stages.

Conclusions:

  • Manufacturer and nomogram dosages underestimate aminoglycoside volume of distribution and clearance in hematologic malignancy patients.
  • Suboptimal peak serum concentrations are common, potentially impacting treatment efficacy.
  • Recommended amikacin initiation dose: 7.5-10 mg/kg every 8h; gentamicin: 2-2.5 mg/kg every 8h, with adjustments based on individual pharmacokinetics.