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• W1625888159 abstract "An appropriate plasma concentration of fentanyl is the key to achieving good pain control in cancer patients. Cachexia, a multifactorial syndrome, is known to affect drug-metabolizing enzymes. However, the fentanyl concentrations in the blood of patients with cachexia have not been analyzed. The aim of this study was to evaluate the influence of cancer cachexia on dose-adjusted plasma fentanyl concentrations in cancer patients.Blood was collected from 21 Japanese cancer patients treated with a 24-hour trans-dermal fentanyl patch during the steady state of fentanyl plasma concentration. Plasma fentanyl concentrations were analyzed using liquid chromatography with tandem mass spectrometry (LC-MS/MS), and the levels were adjusted with the dose of fentanyl. Laboratory data were collected, and the cachexia stage was determined, based on study by Fearon et al. Multiple regression analysis was performed to identify the factors that affected fentanyl plasma concentrations.Eight patients were classified as precachexia, nine as cachexia, and four as refractory cachexia, and the median dose-adjusted fentanyl concentrations (ng/mL per mg/kg/day) were 27.5, 34.4, and 44.5, respectively. The dose-adjusted fentanyl concentration in patients with refractory cachexia was higher than that in patients with precachexia (Kruskal-Wallis test and post hoc Mann-Whitney U-test, P<0.01). The factors that were found to possibly affect the dose-adjusted concentration of fentanyl included aspartate aminotransferase, C-reactive protein, and estimated glomerular filtration rate, when analyzed as six independent variables (multiple regression analysis, P<0.05).The dose-adjusted plasma concentrations of fentanyl increased with progression of cancer cachexia. Such an increase is associated with a multifactorial and systemic syndrome in cancer cachexia patients, including lower albumin, higher C-reactive protein, and impaired kidney function. In patients with cancer cachexia, we suggest that evaluation of cancer cachexia might help pain management when using a transdermal fentanyl patch in palliative care." @default.
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• W1625888159 date "2015-05-01" @default.
• W1625888159 modified "2023-09-25" @default.
• W1625888159 title "Refractory cachexia is associated with increased plasma concentrations of fentanyl in cancer patients" @default.
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• W1625888159 doi "https://doi.org/10.2147/tcrm.s79374" @default.
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