The objective is to compare the plasma concentrations of patients with acute renal failure (ARF) or requiring extra renal replacement therapy (RRT) with those of patients without these characteristics to look for differences in concentration.
Trimethoprim/sulfamethoxazole (TMP/SMX, cotrimoxazole) is the first-line therapy for Pneumocystis jirovecii pneumonia and bacterial infections in critically ill patients, where acute kidney injury (AKI) and renal replacement therapy (RRT) are regularly observed. Both may change half-life and subsequent concentrations. Specifically, Trimethoprim (TMP) is eliminated renally, whereas sulfamethoxazole (SMX) elimination is 80%metabolic/20%renal. Despite decades of cotrimoxazole use, data in acute kidney injury (AKI) are scarce and no consensus on dosing strategy has been established. Besides, pharmacodynamic parameter has not been determined, leading to an uncertainty on the dosing regimen.