Worldwide rates of obesity have doubled in the last 30 years, and obesity has been associated as a risk factor for hospital-acquired infections and increased occurrence of death in critically-ill patients. Piperacillin/tazobactam is a commonly prescribed antibiotic for critically ill patients with an infection, however, limited information exists for dosing this drug in obese patients. In these limited reports, standard doses of piperacillin/tazobactam given to the small number of obese patients resulted in lower blood concentrations, which could lead to inadequate killing of bacteria. The purpose of this study is to compare blood concentrations from standard piperacillin/tazobactam dosing compared to higher dosing regimens in obese patients. This study will also include information on the safety and tolerability of the higher dose regimens. The study investigators believe that the higher dosing regimen will produce adequate blood levels in obese patients and will not add any more risk of harm to obese patients receiving this higher dose.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
29
Patients will receive a standard dose of piperacillin/tazobactam, then will have subsequent pharmacokinetic analyses on the blood concentrations drawn while on standard dose. Patients will be switched to higher dose after receiving the standard dose, with subsequent pharmacokinetic analyses performed on those blood concentrations while on higher dose. These pharmacokinetics of each dosing regimen will be compared.
Loma Linda University Medical Center
Loma Linda, California, United States
Serum Maximum Concentrations for Piperacillin
Pharmacokinetic parameters for piperacillin of maximum serum concentration (Cmax) will be measured in both standard dosing and high dosing.
Time frame: 0, 1, 3, and 6 hours post-dose
Serum Minimum Concentrations of Piperacillin
Minimum serum concentrations (Cmin) of piperacillin will be measured in both standard and high doses
Time frame: 0, 1, 3, and 6 hours post-dose
Half-life of Piperacillin
Half-life (t1/2) of piperacillin will be calculated from serum concentrations in both standard and high doses
Time frame: 0, 1, 3, and 6 hours post-dose
Volume of Distribution of Piperacillin
Volume of distribution (Vd) of piperacillin will be calculated from serum concentrations in both standard and high doses
Time frame: 0, 1, 3, and 6 hours post-dose
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