Publications by authors named "Donna Austin"

4 Publications

  • Page 1 of 1

Validation of a liquid chromatography tandem mass spectrometry method for the simultaneous determination of hydroxychloroquine and metabolites in human whole blood.

Clin Chem Lab Med 2020 09 13;58(12):2047-2061. Epub 2020 Sep 13.

Biochemical Sciences, Viapath, Guys & St Thomas' NHSFT, London, UK.

Objectives Hydroxychloroquine (HCQ) is an anti-malarial and immunomodulatory drug reported to inhibit the Corona virus, SARS-CoV-2, in vitro. At present there is insufficient evidence from clinical trials to determine the safety and efficacy of HCQ as a treatment for COVID-19. However, since the World Health Organisation declared COVID-19 a pandemic in March 2020, the US Food and Drug Administration issued an Emergency Use Authorisation to allow HCQ and Chloroquine (CQ) to be distributed and used for certain hospitalised patients with COVID-19 and numerous clinical trials are underway around the world, including the UK based RECOVERY trial, with over 1000 volunteers. The validation of a liquid chromatography tandem mass spectrometry (LC-MS/MS) method for the simultaneous determination of HCQ and two of its major metabolites, desethylchloroquine (DCQ) and di-desethylchloroquine (DDCQ), in whole blood is described. Methods Blood samples were deproteinised using acetonitrile. HCQ, DCQ and DDCQ were chromatographically separated on a biphenyl column with gradient elution, at a flow rate of 500 μL/min. The analysis time was 8 min. Results For each analyte linear calibration curves were obtained over the concentration range 50-2000 μg/L, the lower limit of quantification (LLOQ) was 13 μg/L, the inter-assay relative standard deviation (RSD) was <10% at 25, 800 and 1750 μg/L and mean recoveries were 80, 81, 78 and 62% for HCQ, d4-HCQ, DCQ and DDCQ, respectively. Conclusion This method has acceptable analytical performance and is applicable to the therapeutic monitoring of HCQ, evaluating the pharmacokinetics of HCQ in COVID-19 patients and supporting clinical trials.
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http://dx.doi.org/10.1515/cclm-2020-0610DOI Listing
September 2020

Challenging the status quo: A comparison of ion exchange chromatography with liquid chromatography-mass spectrometry and liquid chromatography-tandem mass spectrometry methods for the measurement of amino acids in human plasma.

Ann Clin Biochem 2020 07;57(4):277-290

Biochemical Sciences, Viapath, St Thomas' Hospital, London, UK.

Background: Plasma amino acid analysis is key to the diagnosis and monitoring of inherited disorders of amino acid synthesis, catabolism and transport. Ion exchange chromatography (IEC) is widely accepted as the gold standard method of analysis, but with the introduction of liquid chromatography tandem mass spectrometry (LC-MS/MS) and liquid chromatography mass spectrometry (LC-MS) methods, this should now be questioned.

Methods: The analytical performance of three commercially available reagent kits, Waters AccQ Tag™ ULTRA LC-MS, SpOtOn Amino Acids LC-MS/MS and Chromsystems MassChrom® Amino Acid Analysis LC-MS/MS, were evaluated and compared with Biochrom Physiological Amino Acids ion exchange chromatography. Correlation with IEC was assessed by Passing-Bablok regression, concordance correlation coefficients (CCC) and Bland-Altman analysis for 21 common amino acids. Calculation of the total error from imprecision and bias was also used to benchmark performance.

Results: The MassChrom® and SpOtOn kits demonstrated acceptable inter-batch imprecision (CV < 10%) and accuracy (mean bias < 10%), whereas the AccQ Tag™ ULTRA kit did not. Good correlation (CCC > 0.95) with Biochrom IEC was demonstrated for 10/21 analytes in both the MassChrom® and SpOtOn kits and 6/21 in the AccQ Tag™ ULTRA kit.

Conclusions: The LC-MS assay demonstrated variable analytical performance and correlated poorly with ion exchange chromatography. Both LC-MS/MS assays demonstrated comparable analytical performance and reasonable correlation with ion exchange chromatography. They also confer practical advantages which cannot be realized by ion exchange chromatography, superior specificity and significantly faster analysis time, suggesting that ion exchange chromatography should no longer be described as the gold standard method for plasma amino acid analysis.
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http://dx.doi.org/10.1177/0004563220933303DOI Listing
July 2020

The child's experience of single room isolation: a literature review.

Nurs Child Young People 2013 Apr;25(3):18-24

University Hospital Southampton.

Studies have shown that people who require single room isolation while in hospital often feel lonely, sad, worried, bored and in need of information. A literature review identified only 16 papers reporting on the child's experience of isolation. Findings indicate that children feel lonely, are scared of the personal protective equipment and feel bored. Patients' parents feel guilty, worried and under increased pressure to visit their children. It is also suggested that isolation may affect child development.
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http://dx.doi.org/10.7748/ncyp2013.04.25.3.18.e145DOI Listing
April 2013

The psychophysiological effects of music therapy in intensive care units.

Authors:
Donna Austin

Paediatr Nurs 2010 Apr;22(3):14-20

Basingstoke and North Hampshire Foundation Trust, Hampshire.

This article reviews the evidence for using music therapy with young people who are supported by mechanical ventilation. The author argues that music therapy is essential for developing a holistic approach focusing on the developmental level of a child or young person, as well as being an inexpensive, non-pharmacological, non-invasive therapy, with significant physiological and psychological benefits. She argues that more research is needed in this area to develop a sound evidence base on which guidelines to inform practice could be based.
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http://dx.doi.org/10.7748/paed2010.04.22.3.14.c7637DOI Listing
April 2010
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