[논문]Determining zolpidem compliance: urinary metabolite detection and prevalence in chronic pain patients.

Schwope, David M; DePriest, Anne; Black, David L; Caplan, Yale H; Cone, Edward J; Heltsley, Rebecca

doi:10.1093/jat/bku068

Determining zolpidem compliance: urinary metabolite detection and prevalence in chronic pain patients. 원문보기

Journal of analytical toxicology, v.38 no.8, 2014년, pp.513 - 518

Schwope, David M , DePriest, Anne , Black, David L , Caplan, Yale H , Cone, Edward J , Heltsley, Rebecca

Abstract ▼ AI-Helper

Zolpidem (Ambien(?)) is the most prescribed insomnia treatment in the USA; however, little is known about zolpidem metabolite excretion in chronic pain patients. As zolpidem is extensively metabolized in vivo to zolpidem 4-phenyl carboxylic acid (ZCA), metabolite detection may provide improved accuracy for compliance determinations, thereby improving clinical decisions. Zolpidem and ZCA were extracted from 1 mL human urine by mixed-mode solid-phase extraction. Samples were analyzed by LC-MS-MS using positive electrospray ionization with multiple reaction monitoring mode employed for detection and quantification. Gradient chromatographic separation was achieved with a reversed-phase column in a rapid 1.8 min analysis. The assay was linear from 4 to 1,000 ?g/L for zolpidem and 4 to 10,000 ?g/L for ZCA. Interday recovery (bias) and imprecision (n = 20) were 100-107% of target and 2.4-3.7% relative standard deviation, respectively. Extraction efficiencies were 78-90%. Pain compliance samples (n = 3,142) were de-identified and analyzed for zolpidem and ZCA. Zolpidem was detected greater than limit of quantification in 720 specimens (22.9%), while ZCA was detected in 1,579 specimens (50.3%). Only five specimens contained zolpidem alone. ZCA was observed without parent zolpidem in 864 specimens, thereby increasing population detection rates by 27.5%. Addition of a zolpidem metabolite to compliance determinations substantially improved detection for zolpidem intake and also should prove useful in clinical and forensic settings.

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Determining zolpidem compliance: urinary metabolite detection and prevalence in chronic pain patients. 원문보기

Abstract ▼ AI-Helper

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