Pharmacogenetic association of CYP enzymes with therapeutic propofol doses during mechanical ventilation.

Propofol is commonly used to sedate patients, but variations in how individuals metabolize the drug may affect dosing requirements. The objective of this study was to explore how genetic variations in CYP450 enzymes, particularly CYP2B6 , influence propofol metabolism in ICU patients receiving mechanical ventilation. Genetic variants of CYP2B6 , CYP2C9 , CYP2C19 , and CYP3A5 were collected from an institutional genetic data repository. Patients were dichotomized into low and high metabolic activity for each enzyme, and the mean weight- and time-normalized propofol dose administered was compared between groups via t test. There was no significant difference in average daily propofol dose between patients with low and high CYP2B6 activity (11 vs. 11 mg/kg/h, P  = 0.78), or any of the other CYP enzymes analyzed (all P  > 0.05). This study could not replicate previous studies indicating that patients carrying genetic variants with diminished CYP2B6 activity required lower propofol doses. Future studies with prospectively collected dosing and outcomes data, and measurement of plasma drug concentrations, may provide insights into personalized propofol dosing strategies.