Publications by authors named "Kayla Ellefsen"

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From promise to practice: why HRMS has yet to fully revolutionize forensic toxicology.
Luke N Rodda, Kayla N Ellefsen, Marie Mardal, Peter Stockham, Andrea E Steuer

J Anal Toxicol· September 2025

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New and Emerging "Nitazene" Analogues Appearing in Medicolegal Death Investigations: N -Pyrrolidino Protonitazene and N -Desethyl Isotonitazene.
Sara Walton, Donna Papsun, Elisa Shoff, Kayla Ellefsen, Alex Krotulski

Am J Forensic Med Pathol· June 2025

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The rise of bromazolam in postmortem cases from Travis County, TX, and surrounding areas: 2021 to 2023.
Kayla N Ellefsen, Christina R Smith, Paul D Simmons, Lauren A Edelman, Brad J Hall

J Anal Toxicol· January 2025

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Seized drug reporting of NPS helps to guide regional toxicological practice: A 17 month review between 2022 and 2023.
Kayla N Ellefsen, Donna M Papsun, Dani C Mata, Jessica L Ayala, Celia Modell

J Forensic Sci· July 2024

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Emergence of fentanyl-related deaths in Travis County, Texas and surrounding areas: A retrospective review of postmortem fentanyl-related drug toxicities from 2020 to 2022.
Kayla N Ellefsen, Christina R Smith, Elizabeth A Taylor, Brad J Hall

J Forensic Sci· September 2023

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Subtherapeutic Acetazolamide Doses as a Noninvasive Method for Assessing Medication Adherence.
Aidan J Hampson, Jennifer R Schroeder, Kayla N Ellefsen, Luba Yammine, David H Epstein

Clin Pharmacol Ther· December 2020

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Acute effects of intravenous cocaine administration on serum concentrations of ghrelin, amylin, glucagon-like peptide-1, insulin, leptin and peptide YY and relationships with cardiorespiratory and subjective responses.
Sofia Bouhlal, Kayla N Ellefsen, Mikela B Sheskier, Erick Singley, Sandrine Pirard

Drug Alcohol Depend· November 2017

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Multiple Drug-Toxicity Involving Novel Psychoactive Substances, 3-Fluorophenmetrazine and U-47700.
Kayla N Ellefsen, Elizabeth A Taylor, Paul Simmons, Vickie Willoughby, Brad J Hall

J Anal Toxicol· November 2017

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Pharmacokinetic Profiles and Pharmacodynamic Effects for Methylone and Its Metabolites in Rats.
Joshua S Elmore, Ora Dillon-Carter, John S Partilla, Kayla N Ellefsen, Marta Concheiro

Neuropsychopharmacology· February 2017

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Cocaine and benzoylecgonine oral fluid on-site screening and confirmation.
Kayla N Ellefsen, Marta Concheiro, Sandrine Pirard, David A Gorelick, Marilyn A Huestis

Drug Test Anal· January 2017

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In vitro, in vivo and in silico metabolic profiling of α-pyrrolidinopentiothiophenone, a novel thiophene stimulant.
Madeleine J Swortwood, Jeremy Carlier, Kayla N Ellefsen, Ariane Wohlfarth, Xingxing Diao

Bioanalysis· September 2016

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First metabolic profile of PV8, a novel synthetic cathinone, in human hepatocytes and urine by high-resolution mass spectrometry.
Madeleine J Swortwood, Kayla N Ellefsen, Ariane Wohlfarth, Xingxing Diao, Marta Concheiro-Guisan

Anal Bioanal Chem· July 2016

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Cocaine and metabolite concentrations in DBS and venous blood after controlled intravenous cocaine administration.
Kayla N Ellefsen, Jose Luiz da Costa, Marta Concheiro, Sebastien Anizan, Allan J Barnes

Bioanalysis· June 2016

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Pharmacodynamic effects and relationships to plasma and oral fluid pharmacokinetics after intravenous cocaine administration.
Kayla N Ellefsen, Marta Concheiro, Sandrine Pirard, David A Gorelick, Marilyn A Huestis

Drug Alcohol Depend· June 2016

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Synthetic cathinone pharmacokinetics, analytical methods, and toxicological findings from human performance and postmortem cases.
Kayla N Ellefsen, Marta Concheiro, Marilyn A Huestis

Drug Metab Rev· May 2016

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Oral fluid cocaine and benzoylecgonine concentrations following controlled intravenous cocaine administration.
Kayla N Ellefsen, Marta Concheiro, Sandrine Pirard, David A Gorelick, Marilyn A Huestis

Forensic Sci Int· March 2016

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4-Methoxy-α-PVP: in silico prediction, metabolic stability, and metabolite identification by human hepatocyte incubation and high-resolution mass spectrometry.
Kayla N Ellefsen, Ariane Wohlfarth, Madeleine J Swortwood, Xingxing Diao, Marta Concheiro

Forensic Toxicol· August 2015

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Method validation of the biochip array technology for synthetic cannabinoids detection in urine.
Marisol S Castaneto, Nathalie A Desrosiers, Kayla Ellefsen, Sebastien Anizan, Thomas M Martin

Bioanalysis· July 2015

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Validation of the only commercially available immunoassay for synthetic cathinones in urine: Randox Drugs of Abuse V Biochip Array Technology.
Kayla N Ellefsen, Sébastien Anizan, Marisol S Castaneto, Nathalie A Desrosiers, Thomas M Martin

Drug Test Anal· March 2015

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Quantification of cocaine and metabolites in exhaled breath by liquid chromatography-high-resolution mass spectrometry following controlled administration of intravenous cocaine.
Kayla N Ellefsen, Marta Concheiro, Olof Beck, David A Gorelick, Sandrine Pirard

Anal Bioanal Chem· October 2014

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3,4-Methylenedioxypyrovalerone (MDPV) and metabolites quantification in human and rat plasma by liquid chromatography-high resolution mass spectrometry.
Sebastien Anizan, Kayla Ellefsen, Marta Concheiro, Masaki Suzuki, Kenner C Rice

Anal Chim Acta· May 2014

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Simultaneous quantification of 28 synthetic cathinones and metabolites in urine by liquid chromatography-high resolution mass spectrometry.
Marta Concheiro, Sebastien Anizan, Kayla Ellefsen, Marilyn A Huestis

Anal Bioanal Chem· November 2013

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Examination of some performance characteristics of breath alcohol measurements obtained with the intoxilyzer 8000C following social drinking conditions.
James H Watterson, Kayla N Ellefsen

J Anal Toxicol· October 2009

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