Therapeutic drug monitoring of high-dose gentamicin in an elderly patient: a case report.
OBJECTIVE
To report the pharmacokinetics of gentamicin using traditional multiple daily doses and a high-dose regimen in an elderly patient.


METHODS
An 80-year-old male who presented with mild renal failure received two different gentamicin dosing regimens, 60 mg every 8 h for septicemia and a high dose of 400 mg with extended interval for suspected endocarditis. Based on population parameters of k(e) (0.1030 h(-1)) and Vd (18.1 liters), the initial gentamicin dosage regimen was calculated to be 80 mg every 12 h. The measured peak and trough concentrations were used to calculate the individual parameters of k(e) (0.0749 h(-1)) and Vd (30.9 liters). After a 5-mg.kg(-1) gentamicin dose, the Hartford nomogram was used to estimate the extended dosage interval.


CONCLUSIONS
The Hartford nomogram may be a valid tool for estimating the dosage interval after a 5-mg.kg(-1) single dose of gentamicin.
Al-Lanqawi
Yousef M
YM
Department of Pharmacy, Al-Amiri Hospital, Hawali, Kuwait. yousefl@hsc.edu.kw
Capps
Phillip
P
Abdulmalik
Kefaya
K
D058186:Acute Kidney Injury / Q000150:complications / Q000188:drug therapy*; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D016903:Drug Monitoring; D004696:Endocarditis / Q000150:complications / Q000188:drug therapy*; D005839:Gentamicins / Q000008:administration & dosage / Q000493:pharmacokinetics*; D006801:Humans; D007730:Kuwait; D008297:Male; D049451:Nomograms; D011654:Pulmonary Edema / Q000150:complications
D000900:Anti-Bacterial Agents; D005839:Gentamicins