Are Standard Dosing Regimens of Piperacillin-Tazobactam Suitable in Critically Ill Patients With Open Abdomen and Negative Pressure Wound Therapy? A Population Pharmacokinetic Study.

Blood sample (5 ml) at 30 minutes after the loading dose of 4g/0.5g over 30 minutes for therapeutic drug monitoring at peak concentration (Cmax)

"\- T1 : Day of the first surgical revision, under PTZ administered by continuous infusion : Blood sample (5 ml) for therapeutic drug monitoring at steady state concentration (Css).~Urinary sample and collection of urinary volume between T0 and T1 (Urinary Clearance) NPT fluid sample and collection of NPT volume between T0 and T1 (Peritoneal Clearance) Peritoneal sampling for therapeutic drug monitoring at the site of infection (CPt)"