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Rees CA, Colbourn T, Hooli S, King C, Lufesi N, McCollum ED, Mwansambo C, Cutland C, Madhi SA, Nunes M, Matthew JL, Addo-Yobo E, Chisaka N, Hassan M, Hibberd PL, Jeena PM, Lozano JM, MacLeod WB, Patel A, Thea DM, Nguyen NTV, Kartasasmita CB, Lucero M, Awasthi S, Bavdekar A, Chou M, Nymadawa P, Pape JW, Paranhos-Baccala G, Picot VS, Rakoto-Andrianarivelo M, Rouzier V, Russomando G, Sylla M, Vanhems P, Wang J, Asghar R, Banajeh S, Iqbal I, Maulen-Radovan I, Mino-Leon G, Saha SK, Santosham M, Singhi S, Basnet S, Strand TA, Bhatnagar S, Wadhwa N, Lodha R, Aneja S, Clara AW, Campbell H, Nair H, Falconer J, Qazi SA, Nisar YB, Neuman MI. Derivation and validation of a novel risk assessment tool to identify children aged 2–59 months at risk of hospitalised pneumonia-related mortality in 20 countries. BMJ Glob Health 2022; 7:bmjgh-2021-008143. [PMID: 35428680 PMCID: PMC9014031 DOI: 10.1136/bmjgh-2021-008143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/20/2022] [Indexed: 11/27/2022] Open
Abstract
Introduction Existing risk assessment tools to identify children at risk of hospitalised pneumonia-related mortality have shown suboptimal discriminatory value during external validation. Our objective was to derive and validate a novel risk assessment tool to identify children aged 2–59 months at risk of hospitalised pneumonia-related mortality across various settings. Methods We used primary, baseline, patient-level data from 11 studies, including children evaluated for pneumonia in 20 low-income and middle-income countries. Patients with complete data were included in a logistic regression model to assess the association of candidate variables with the outcome hospitalised pneumonia-related mortality. Adjusted log coefficients were calculated for each candidate variable and assigned weighted points to derive the Pneumonia Research Partnership to Assess WHO Recommendations (PREPARE) risk assessment tool. We used bootstrapped selection with 200 repetitions to internally validate the PREPARE risk assessment tool. Results A total of 27 388 children were included in the analysis (mean age 14.0 months, pneumonia-related case fatality ratio 3.1%). The PREPARE risk assessment tool included patient age, sex, weight-for-age z-score, body temperature, respiratory rate, unconsciousness or decreased level of consciousness, convulsions, cyanosis and hypoxaemia at baseline. The PREPARE risk assessment tool had good discriminatory value when internally validated (area under the curve 0.83, 95% CI 0.81 to 0.84). Conclusions The PREPARE risk assessment tool had good discriminatory ability for identifying children at risk of hospitalised pneumonia-related mortality in a large, geographically diverse dataset. After external validation, this tool may be implemented in various settings to identify children at risk of hospitalised pneumonia-related mortality.
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Affiliation(s)
- Chris A Rees
- Division of Pediatric Emergency Medicine, Emory University School of Medicine, Children's Healthcare of Atlanta, Atlanta, Georgia, USA
| | - Tim Colbourn
- Institute for Global Health, University College London, London, UK
| | - Shubhada Hooli
- Section of Pediatric Emergency Medicine, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas, USA
| | - Carina King
- Department of Global Public Health, Karolinska Institutet, Stockholm, Sweden
| | - Norman Lufesi
- Acute Respiratory Illness Unit, Government of Malawi Ministry of Health, Lilongwe, Malawi
| | - Eric D McCollum
- Global Program in Respiratory Sciences, Eudowood Division of Pediatric Respiratory Sciences, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Charles Mwansambo
- Acute Respiratory Illness Unit, Government of Malawi Ministry of Health, Lilongwe, Malawi
| | - Clare Cutland
- South African Medical Research Council: Vaccines and Infectious Diseases Analytics Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg-Braamfontein, South Africa
| | - Shabir Ahmed Madhi
- South African Medical Research Council: Vaccines and Infectious Diseases Analytics Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg-Braamfontein, South Africa
| | - Marta Nunes
- South African Medical Research Council: Vaccines and Infectious Diseases Analytics Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg-Braamfontein, South Africa
| | - Joseph L Matthew
- Advanced Pediatrics Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | | | - Noel Chisaka
- World Bank, World Bank, Washington, District of Columbia, USA
| | - Mumtaz Hassan
- Department of Pediatrics, Children's Hospital, Islamabad, Pakistan
| | - Patricia L Hibberd
- Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Prakash M Jeena
- Department of Paediatrics and Child Health, University of KwaZulu-Natal Nelson R Mandela School of Medicine, Durban, South Africa
| | - Juan M Lozano
- Division of Medical and Population Health Science Education and Research, Florida International University, Miami, Florida, USA
| | - William B MacLeod
- Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Archana Patel
- Lata Medical Research Foundation, Nagpur and Datta Meghe Institute of Medical Sciences, Sawangi, India
| | - Donald M Thea
- Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | | | - Cissy B Kartasasmita
- Department of Child Health, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Marilla Lucero
- Department of Pediatrics, Research Institute for Tropical Medicine, Muntinlupa City, Philippines
| | - Shally Awasthi
- Department of Pediatrics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | | | - Monidarin Chou
- Rodolph Mérieux Laboratory, Faculty of Medicine, University of Health Sciences, Phnom Penh, Cambodia
| | - Pagbajabyn Nymadawa
- Department of Pediatrics, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
| | | | | | | | | | | | - Graciela Russomando
- Departamento de Biología Molecular y Genética, Instituto de Investigaciones en Ciencias de la Salud, Asuncion, Paraguay
| | - Mariam Sylla
- Department of Pediatrics, Gabriel Touré University Hospital Center, Bamako, Mali
| | - Philippe Vanhems
- Unité d'Hygiène, Epidémiologie, Infectiovigilance et Prévention, Hospices Civils de Lyon, Lyon, France
| | - Jianwei Wang
- MOH Key Laboratory of Systems Biology of Pathogens and Dr Christophe Mérieux Laboratory, Chinese Academy of Medical Sciences & Peking Union, Beijing, China
| | - Rai Asghar
- Department of Paediatrics, Rawalpindi Medical College, Rawalpindi, Pakistan
| | - Salem Banajeh
- Department of Pediatrics, Sana'a University, Sana'a, Yemen
| | - Imran Iqbal
- Department of Pediatrics, Nishtar Medical College, Multan, Pakistan
| | - Irene Maulen-Radovan
- Division de Investigacion Insurgentes, Instituto Nactional de Pediatria, Mexico City, Mexico
| | - Greta Mino-Leon
- Infectious Diseases, Children's Hospital Dr Francisco de Ycaza Bustamante, Guayaquil, Ecuador
| | - Samir K Saha
- Child Health Research Foundation, Dhaka Shishu Hosp, Dhaka, Bangladesh
| | - Mathuram Santosham
- International Vaccine Access Center (IVAC), Department of International Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Sunit Singhi
- Department of Pediatrics, Medanta, The Medicity, Gurgaon, India
| | - Sudha Basnet
- Department of Pediatrics, Tribhuvan University Institute of Medicine, Kathmandu, Nepal
| | - Tor A Strand
- Department of Research, Innlandet Hospital Trust, Lillehammer, Norway
| | - Shinjini Bhatnagar
- Department of Maternal and Child Health, Translational Health Science and Technology Institute, Faridabad, India
| | - Nitya Wadhwa
- Department of Maternal and Child Health, Translational Health Science and Technology Institute, Faridabad, India
| | - Rakesh Lodha
- Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
| | - Satinder Aneja
- Department of Pediatrics, Sharda University School of Medical Sciences and Research, Greater Noida, Uttar Pradesh, India
| | - Alexey W Clara
- Central American Region, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Harry Campbell
- Population Health Sciences and Informati, The University of Edinburgh, Edinburgh, UK
| | - Harish Nair
- Centre for Global Health, Usher Institute, The University of Edinburgh, Edinburgh, Scotland
| | - Jennifer Falconer
- Centre for Global Health, Usher Institute, The University of Edinburgh, Edinburgh, Scotland
| | - Shamim A Qazi
- Department of Maternal, Newborn, Child, and Adolescent Health (Retired), World Health Organization, Geneva, Switzerland
| | - Yasir B Nisar
- Department of Maternal, Newborn, Child and Adolescent Health and Ageing, World Health Organization, Geneva, Switzerland
| | - Mark I Neuman
- Division of Emergency Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
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2
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Rees CA, Hooli S, King C, McCollum ED, Colbourn T, Lufesi N, Mwansambo C, Lazzerini M, Madhi SA, Cutland C, Nunes M, Gessner BD, Basnet S, Kartasasmita CB, Mathew JL, Zaman SMAU, Paranhos-Baccala G, Bhatnagar S, Wadhwa N, Lodha R, Aneja S, Santosham M, Picot VS, Sylla M, Awasthi S, Bavdekar A, Pape JW, Rouzier V, Chou M, Rakoto-Andrianarivelo M, Wang J, Nymadawa P, Vanhems P, Russomando G, Asghar R, Banajeh S, Iqbal I, MacLeod W, Maulen-Radovan I, Mino G, Saha S, Singhi S, Thea DM, Clara AW, Campbell H, Nair H, Falconer J, Williams LJ, Horne M, Strand T, Qazi SA, Nisar YB, Neuman MI. External validation of the RISC, RISC-Malawi, and PERCH clinical prediction rules to identify risk of death in children hospitalized with pneumonia. J Glob Health 2021; 11:04062. [PMID: 34737862 PMCID: PMC8542381 DOI: 10.7189/jogh.11.04062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Existing scores to identify children at risk of hospitalized pneumonia-related mortality lack broad external validation. Our objective was to externally validate three such risk scores. METHODS We applied the Respiratory Index of Severity in Children (RISC) for HIV-negative children, the RISC-Malawi, and the Pneumonia Etiology Research for Child Health (PERCH) scores to hospitalized children in the Pneumonia REsearch Partnerships to Assess WHO REcommendations (PREPARE) data set. The PREPARE data set includes pooled data from 41 studies on pediatric pneumonia from across the world. We calculated test characteristics and the area under the curve (AUC) for each of these clinical prediction rules. RESULTS The RISC score for HIV-negative children was applied to 3574 children 0-24 months and demonstrated poor discriminatory ability (AUC = 0.66, 95% confidence interval (CI) = 0.58-0.73) in the identification of children at risk of hospitalized pneumonia-related mortality. The RISC-Malawi score had fair discriminatory value (AUC = 0.75, 95% CI = 0.74-0.77) among 17 864 children 2-59 months. The PERCH score was applied to 732 children 1-59 months and also demonstrated poor discriminatory value (AUC = 0.55, 95% CI = 0.37-0.73). CONCLUSIONS In a large external application of the RISC, RISC-Malawi, and PERCH scores, a substantial number of children were misclassified for their risk of hospitalized pneumonia-related mortality. Although pneumonia risk scores have performed well among the cohorts in which they were derived, their performance diminished when externally applied. A generalizable risk assessment tool with higher sensitivity and specificity to identify children at risk of hospitalized pneumonia-related mortality may be needed. Such a generalizable risk assessment tool would need context-specific validation prior to implementation in that setting.
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Affiliation(s)
- Chris A Rees
- Division of Pediatric Emergency Medicine, Emory University School of Medicine, Children's Healthcare of Atlanta, Atlanta, Georgia, USA
| | - Shubhada Hooli
- Section of Pediatric Emergency Medicine, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas, USA
| | - Carina King
- Department of Global Public Health, Karolinska Institutet, Stockholm, Sweden and Institute for Global Health, University College London, London, UK
| | - Eric D McCollum
- Global Program in Respiratory Sciences, Eudowood Division of Pediatric Respiratory Sciences, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, USA and Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, USA
| | - Tim Colbourn
- Institute for Global Health, University College London, London, UK
| | | | | | - Marzia Lazzerini
- WHO Collaborating Centre for Maternal and Child Health, Institute for Maternal and Child Health IRCCS Burlo Garofolo, Trieste, Italy
| | - Shabir Ahmed Madhi
- South African Medical Research Council: Vaccines and Infectious Diseases Analytics Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Clare Cutland
- South African Medical Research Council: Vaccines and Infectious Diseases Analytics Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases Unit, University of the Witwatersrand, Johannesburg, South Africa
| | - Marta Nunes
- South African Medical Research Council: Vaccines and Infectious Diseases Analytics Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases Unit, University of the Witwatersrand, Johannesburg, South Africa
| | | | - Sudha Basnet
- Center for Intervention Science in Maternal and Child Health, University of Bergen, Norway
| | - Cissy B Kartasasmita
- Department of Child Health, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Joseph L Mathew
- Pediatric Pulmonology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | | | | | | | - Nitya Wadhwa
- Translational Health Science and Technology Institute, Faridabad, India
| | - Rakesh Lodha
- All India Institute of Medical Sciences, New Delhi, India
| | - Satinder Aneja
- School of Medical Sciences & Research, Sharda University, Greater Noida, India
| | - Mathuram Santosham
- Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | | | - Mariam Sylla
- Gabriel Touré Hospital, Department of Pediatrics, Bamako, Mali
| | - Shally Awasthi
- King George's Medical University, UP, Department of Pediatrics, Lucknow, India
| | | | | | | | - Monidarin Chou
- University of Health Sciences Faculty of Medicine, Rodolph Mérieux Laboratory, Phom Phen, Cambodia
| | | | - Jianwei Wang
- Chinese Academy of Medical Sciences & Peking Union, Medical College Institute of Pathogen Biology, MOH Key Laboratory of Systems Biology of Pathogens and Dr Christophe Mérieux Laboratory, Beijing, China
| | - Pagbajabyn Nymadawa
- Mongolian Academy of Sciences, Academy of Medical Sciences, Ulaanbaatar, Mongolia
| | - Philippe Vanhems
- Hospices Civils de Lyon, Infection Control Unit; CIRI, Centre International de Recherche en Infectiologie, (Team PHE3ID), Université Claude Bernard Lyon, Lyon, France
| | - Graciela Russomando
- Universidad Nacional de Asuncion, Instituto de Investigaciones en Ciencias de la Salud, San Lorenzo, Paraguay
| | - Rai Asghar
- Rawalpindi Medical College, Rawalpindi, Pakistan
| | | | | | - William MacLeod
- Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Irene Maulen-Radovan
- Instituto Nactional de Pediatria Division de Investigacion Insurgentes, Mexico City, Mexico
| | - Greta Mino
- Children's Hospital Dr Francisco de Ycaza Bustamante, Head of Department, Infectious diseases, Guayaquil, Ecuador
| | - Samir Saha
- Dhaka Shishu Hospital, Dhaka, Bangladesh
| | | | - Donald M Thea
- Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Alexey W Clara
- US Centers for Disease Control, Central American Region, Guatemala City, Guatemala
| | - Harry Campbell
- Centre for Global Health, Usher Institute, The University of Edinburgh, Edinburgh, Scotland
| | - Harish Nair
- Centre for Global Health, Usher Institute, The University of Edinburgh, Edinburgh, Scotland
| | - Jennifer Falconer
- Institute for Global Health and Development, Queen Margaret University, Edinburgh, Scotland
| | - Linda J Williams
- Centre for Global Health, Usher Institute, The University of Edinburgh, Edinburgh, Scotland
| | - Margaret Horne
- Centre for Global Health, Usher Institute, The University of Edinburgh, Edinburgh, Scotland
| | - Tor Strand
- Research Department, Innlandet Hospital Trust, Lillehammer, Norway
| | - Shamim A Qazi
- Department of Maternal, Newborn, Child and Adolescent Health (Retired), World Health Organization, Geneva, Switzerland
| | - Yasir B Nisar
- Department of Maternal, Newborn, Child and Adolescent Health and Ageing, World Health Organization, Geneva, Switzerland
| | - Mark I Neuman
- Division of Emergency Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
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Raboni SM, Moura FEA, Caetano BC, Avanzi VM, Pereira LA, Nogueira MB, Vidal LR, Tavares ICF, Pradel FK, Picot VS, Puig-Barbera J, Siqueira MM. Global Influenza Hospital-based Surveillance Network (GIHSN): results of surveillance of influenza and other respiratory viruses in hospitalised patients in Brazil, 2015. BMJ Open 2018; 8:e017603. [PMID: 29449287 PMCID: PMC5829850 DOI: 10.1136/bmjopen-2017-017603] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Influenza-like illness occurs annually worldwide, with peak timing and severity varying seasonally, resulting in significant annual mortality. OBJECTIVES There were three objectives: (1) to describe the epidemiological and clinical features of hospitalised patients with severe acute respiratory infection caused by influenza and other respiratory viruses (ORVs); (2) to report the influenza seasonality in the region and (3) to correlate findings of influenza circulation and immunisation time in Brazil. PATIENTS/METHODS This study took place in three Brazilian hospitals located in cities with different climatic conditions (Curitiba (south), Rio de Janeiro (south-east) and Fortaleza (north-east)). Patients presenting with an acute process with indication for admission consisting of a predefined set of conditions potentially associated with recent influenza infection were enrolled. RESULTS We screened 1666 patients, with 595 meeting the inclusion criteria. Influenza viruses and ORVs were detected in 6.5% and 59% of patients, respectively. Influenza-positive cases fell into the severe spectrum as compared with those with ORVs (30% vs 11%), but without any difference in mortality rates. Epidemiological results revealed variations in the peak time of influenza infections between north-east (Fortaleza) and south (Curitiba) Brazil, basically following the rain period of each region. In north-east Brazil, viral circulation was prevalent in the first 4 months of the year, indicating that the vaccination campaign occurred in a postseasonal period, possibly explaining the low effectiveness. CONCLUSIONS The active-surveillance model is a valuable tool for investigating respiratory virus impact on hospitalised patients, with influenza-infection monitoring enabling implementation of adequate preventive measures.
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Affiliation(s)
- Sonia M Raboni
- Departamento de Doenças Infecciosas, Universidade Federal do Paraná, Curitiba, Brazil
- Laboratório de Virologia, Universidade Federal do Paraná, Curitiba, Brazil
| | - Fernanda E A Moura
- Departamento de Patologia e Medicina Legal, Universidade Federal do Ceará, Fortaleza, Brazil
| | - Braulia C Caetano
- Laboratório de Vírus Respiratórios e do Sarampo, Instituto Oswaldo Cruz, Fundacao Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Valéria M Avanzi
- Programa de Pós-graduação em Medicina Interna e Ciências da Saúde, Universidade Federal do Paraná, Curitiba, Brazil
| | - Luciane A Pereira
- Laboratório de Virologia, Universidade Federal do Paraná, Curitiba, Brazil
| | - Meri B Nogueira
- Laboratório de Virologia, Universidade Federal do Paraná, Curitiba, Brazil
| | - Luine R Vidal
- Laboratório de Virologia, Universidade Federal do Paraná, Curitiba, Brazil
| | - Isabel C F Tavares
- Hospital Quinta D'Or, Rio de Janeiro, Brazil
- Instituto Nacional de Infectologia, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | | | | | | | - Marilda M Siqueira
- Laboratório de Vírus Respiratórios e do Sarampo, Instituto Oswaldo Cruz, Fundacao Oswaldo Cruz, Rio de Janeiro, Brazil
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Abstract
1. Direct injection h.p.l.c. methods for zaprinast, and pantoprazole and its sulphone metabolite were developed. 2. Optimal recovery of pantoprazole and its sulphone metabolite was effected by the absence of transfer losses and the effective adjustment of sample pH on-line. 3. Acetonitrile reduced the recovery of pantoprazole and its sulphone metabolite at acetonitrile concentrations greater than 5% in serum. 4. Direct injection h.p.l.c. methods minimize sample handling losses, reduce human contact with biological samples and are sufficiently accurate and reproducible to be used to support pharmacodynamic and toxicokinetic studies.
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Affiliation(s)
- E Doyle
- Department of Metabolism and Pharmacokinetics, SmithKline Beecham, Welwyn, Hertfordshire, UK
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Doyle E, Mitchell AM, Picot VS, Rogers SJ. Determination of temelastine and a hydroxymethyl-pyridyl metabolite in biological fluid by high-performance liquid chromatography. J Pharm Sci 1990; 79:524-6. [PMID: 2395097 DOI: 10.1002/jps.2600790614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A high-performance liquid chromatographic method for the analysis of temelastine (1) and 2-[4-(5-bromo-3-methylpyrid-2-yl)-butylamino]-5-[6-hydroxymethy lpyrid-3- ylmethyl]-pyrimidin-4(1H)-one (1-A) in biological fluid is presented. The method combines the previously reported extraction procedure and new chromatography conditions capable of resolving 1, 1-A, and structurally similar compounds formed by the oxidation of 1. The modified method has been used to measure concentrations of 1 and 1-A in biological fluids taken from the rat and dog, and to look for the presence of 1-A in humans following administration of 1.
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Affiliation(s)
- E Doyle
- Department of Drug Analysis, Smith Kline and French Research Limited, Welwyn, Hertfordshire, United Kingdom
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Picot VS, Doyle E, Pearce JC. Analysis of zaprinast in rat and human plasma by automated solid-phase extraction and reversed-phase high-performance liquid chromatography. J Chromatogr 1990; 527:454-60. [PMID: 2167325 DOI: 10.1016/s0378-4347(00)82131-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- V S Picot
- Product Opportunity Evaluation Group, Smith Kline and French Research Limited, The Frythe, Welwyn, Hertfordshire, U.K
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7
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Doyle E, McDowall RD, Murkitt GS, Picot VS, Rogers SJ. Two systems for the automated analysis of drugs in biological fluids using high-performance liquid chromatography. J Chromatogr 1990; 527:67-77. [PMID: 2164038 DOI: 10.1016/s0378-4347(00)82084-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This paper describes two fully automated assays. One for zaprinast, a cGMP specific phosphodiesterase inhibitor, which uses the Gilson-Advanced Automated Sample Processor combination, and the other for an H+/K+ ATPase inhibitor and its sulphone metabolite, which uses direct injection. Both assays were developed to support pharmacokinetic studies at therapeutic doses in small animals as well as in man. Plasma or serum (20-200 microliters) is placed directly into an autosampler and all subsequent manipulations are performed mechanically.
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Affiliation(s)
- E Doyle
- Department of Drug Analysis, Smith Kline and French Research Ltd., Frythe, Welwyn, Hertfordshire, U.K
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8
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Abstract
Sample preparation for the analysis of drugs in biological fluids consists of a number of unit operations that are used for (i) release of the drug from a conjugate or biological matrix; (ii) removal of endogenous compounds that could interfere with the assay; and (iii) techniques for liquid handling. The trends in sample preparation that have occurred over the past 10 years in the authors' laboratory are discussed. In general, there has been a move from the traditional liquid-liquid extraction to methods using bonded-silica which permit rapid throughput and efficient extraction. Automation of sample preparation has seen further gains in productivity; however, the present generation of equipment lack the control and communication systems that are essential for the development of the automated integrated laboratory of the future.
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Affiliation(s)
- R D McDowall
- Department of Drug Analysis, Smith Kline and French Research Ltd., Welwyn, Hertfordshire, UK
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9
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Abstract
The traditional liquid-liquid extraction method for the removal of drug from biological matrix is being superseded by solid phase extraction. This involves the selection of an appropriate sorbent (normal-phase, reversed-phase, ion-exchange etc.), but once this has been achieved the method is quick and simple to operate. Most sample handling losses are avoided so recovery of drug is high and it is easily automated. Disposable columns have several advantages. Samples of 0.05-2.0 ml can be analysed routinely. Several wash stages can be included in a method to provide a specific extraction prior to a quick analysis by high-performance liquid chromatography (HPLC), radioimmunoassay, UV etc. A potential problem is that retention of the drug may involve more than one mechanism. Elution of drug may therefore require a stronger eluting solvent than analytical HPLC systems using the same stationary phase.
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Affiliation(s)
- E Doyle
- Smith Kline & French Research Ltd., Welwyn, Hertfordshire, U.K
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