Gentamicin disposition kinetics in humans with spinal cord injury

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Abstract
The disposition kinetics of gentamicin, an aminoglycoside antibiotic, were studied in seven tetraplegic and six paraplegic volunteers. The volume of distribution of gentamicin in 1/ kg of body weight varied in a statistically significant way from values of this parameter measured in normal subjects. The elimination of gentamicin in spinal man proceeded in a log-linear fashion accurately characterized by a one compartment open-model with a half-life of approximately 2 hours. The clinical significance of altered disposition kinetics and an increased inter subject variability in gentamicin disposition in spinal man as compared to normal subjects is unknown. The existence of these observed differences in pharmacokinetic parameters, however, emphasizes the need to define individual pharmacokinetic profiles and individualize dosing regimens in spinal man. The data presented are supportive of the hypothesis that spinal man constitutes a discreet therapeutic population.

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