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Ittleman B, Lowenstein S, Edwards LA, Caris E, Bhat A, Conwell J, Lewin M, Arya B. Fetal Echocardiographic Evaluation of Tricuspid Valve and Right Ventricular Function Including Global Longitudinal Strain in Hypoplastic Left Heart Syndrome and Association with Postnatal Outcomes. Pediatr Cardiol 2024:10.1007/s00246-024-03453-5. [PMID: 38647657 DOI: 10.1007/s00246-024-03453-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 02/12/2024] [Indexed: 04/25/2024]
Abstract
Despite significant advancements in the care of patients with hypoplastic left heart syndrome (HLHS) morbidity and mortality remain high. Postnatal right ventricular dysfunction and tricuspid regurgitation (TR) are associated with worse outcomes in HLHS. We aim to determine if right ventricle functional parameters and TR on fetal echocardiogram are associated with postnatal outcomes in HLHS patients. Retrospective review was performed on all fetuses with HLHS from 2014 to 2022 at our institution. Initial and follow up fetal echocardiogram measurements of right ventricular myocardial performance index (MPI), fractional area change (FAC) and global longitudinal strain (GLS) were retrospectively measured. The presence and severity of TR was recorded from the fetal echocardiogram reports. Postnatal outcomes including transplant-free survival, hospital length of stay > 30 days after initial palliation and need for bidirectional Glenn at < 4 months were reviewed. Forty-three subjects met inclusion criteria. Mean gestational age at presentation was 26.1 ± 5.9 weeks. Nine subjects died and 3 required heart transplantation. Initial fetal echocardiogram MPI was significantly lower (better) (0.36 ± 0.06 vs 0.44 ± 0.11; p = < 0.001) and FAC was significantly higher (better) (45 ± 6% vs 40 ± 8%; p = 0.035) in transplant-free survivors. Fetal right ventricular GLS and presence of mild TR were not associated with postnatal outcome. In fetuses with HLHS, abnormal MPI and right ventricular FAC are associated with decreased transplant-free survival. There was no observed association between GLS and postnatal outcomes. To our knowledge this is the first study examining fetal right ventricular function and GLS in HLHS patients and its link to postnatal outcomes.
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Affiliation(s)
- Benjamin Ittleman
- Arkansas Children's Hospital, University of Arkansas Medical Sciences, Little Rock, AR, USA.
| | | | - Lindsay A Edwards
- Department of Pediatrics, Division of Cardiology, Duke University School of Medicine, Durham, NC, USA
| | - Elizabeth Caris
- University of Pittsburgh School of Medicine, University of Pittsburgh Medical Center Children's Hospital of Pittsburgh, Pittsburgh, PA, USA
| | - Aarti Bhat
- Seattle Children's Hospital, University of Washington School of Medicine, Seattle, WA, USA
| | - Jeffrey Conwell
- Seattle Children's Hospital, University of Washington School of Medicine, Seattle, WA, USA
| | - Mark Lewin
- Seattle Children's Hospital, University of Washington School of Medicine, Seattle, WA, USA
| | - Bhawna Arya
- Seattle Children's Hospital, University of Washington School of Medicine, Seattle, WA, USA
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Edwards LA, Feng F, Iqbal M, Fu Y, Sanyahumbi A, Hao S, McElhinney DB, Ling XB, Sable C, Luo J. Machine Learning for Pediatric Echocardiographic Mitral Regurgitation Detection. J Am Soc Echocardiogr 2023; 36:96-104.e4. [PMID: 36191670 DOI: 10.1016/j.echo.2022.09.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 09/23/2022] [Accepted: 09/24/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND Echocardiography-based screening for valvular disease in at-risk asymptomatic children can result in early diagnosis. These screening programs, however, are resource intensive and may not be feasible in many resource-limited settings. Automated echocardiographic diagnosis may enable more widespread echocardiographic screening, early diagnosis, and improved outcomes. In this feasibility study, the authors sought to build a machine learning model capable of identifying mitral regurgitation (MR) on echocardiography. METHODS Echocardiograms were labeled by clip for view and by frame for the presence of MR. The labeled data were used to build two convolutional neural networks to perform the stepwise tasks of classifying the clips (1) by view and (2) by the presence of any MR, including physiologic, in parasternal long-axis color Doppler views. The view classification model was developed using 66,330 frames, and model performance was evaluated using a hold-out testing data set with 45 echocardiograms (11,730 frames). The MR detection model was developed using 938 frames, and model performance was evaluated using a hold-out testing data set with 42 echocardiograms (182 frames). Metrics to evaluate model performance included accuracy, precision, recall, F1 score (average of precision and recall, ranging from 0 to 1, with 1 suggesting perfect precision and recall), and receiver operating characteristic analysis. RESULTS For the parasternal long-axis view with color Doppler, the view classification convolutional neural network achieved an F1 score of 0.97. The MR detection convolutional neural network achieved testing accuracy of 0.86 and an area under the receiver operating characteristic curve of 0.91. CONCLUSIONS A machine learning model is capable of discerning MR on transthoracic echocardiography. This is an encouraging step toward machine learning-based diagnosis of valvular heart disease on pediatric echocardiography.
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Affiliation(s)
- Lindsay A Edwards
- Department of Pediatrics, Seattle Children's Hospital, Seattle, Washington
| | - Fei Feng
- University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Mehreen Iqbal
- Department of Pediatrics, Stanford University School of Medicine, Stanford, California
| | - Yong Fu
- University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Amy Sanyahumbi
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Shiying Hao
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Palo Alto, California
| | - Doff B McElhinney
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Palo Alto, California
| | - X Bruce Ling
- Department of Surgery, Stanford University School of Medicine, Stanford, California
| | - Craig Sable
- Department of Pediatrics, Children's National Health System, Washington, District of Columbia
| | - Jiajia Luo
- Biomedical Engineering Department, Peking University, Beijing, China.
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Sood E, Gramszlo C, Perez Ramirez A, Braley K, Butler SC, Davis JA, Divanovic AA, Edwards LA, Kasparian N, Kelly SL, Neely T, Ortinau CM, Riegel E, Shillingford AJ, Kazak AE. Partnering With Stakeholders to Inform the Co-Design of a Psychosocial Intervention for Prenatally Diagnosed Congenital Heart Disease. J Patient Exp 2022; 9:23743735221092488. [PMID: 35493441 PMCID: PMC9039438 DOI: 10.1177/23743735221092488] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Input from diverse stakeholders is critical to the process of designing healthcare interventions. This study applied a novel mixed-methods, stakeholder-engaged approach to co-design a psychosocial intervention for mothers expecting a baby with congenital heart disease (CHD) and their partners to promote family wellbeing. The research team included parents and clinicians from 8 health systems. Participants were 41 diverse parents of children with prenatally diagnosed CHD across the 8 health systems. Qualitative data were collected through online crowdsourcing and quantitative data were collected through electronic surveys to inform intervention co-design. Phases of intervention co-design were: (I) Engage stakeholders in selection of intervention goals/outcomes; (II) Engage stakeholders in selection of intervention elements; (III) Obtain stakeholder input to increase intervention uptake/utility; (IV) Obtain stakeholder input on aspects of intervention design; and (V) Obtain stakeholder input on selection of outcome measures. Parent participants anticipated the resulting intervention, HEARTPrep, would be acceptable, useful, and feasible for parents expecting a baby with CHD. This model of intervention co-design could be used for the development of healthcare interventions across chronic diseases.
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Affiliation(s)
- Erica Sood
- Nemours Cardiac Center, Nemours Children’s Hospital Delaware, Wilmington, DE, USA
- Nemours Center for Healthcare Delivery Science, Nemours Children’s Hospital Delaware, Wilmington, DE, USA
- Department of Pediatrics, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Colette Gramszlo
- Nemours Cardiac Center, Nemours Children’s Hospital Delaware, Wilmington, DE, USA
| | - Alejandra Perez Ramirez
- Nemours Center for Healthcare Delivery Science, Nemours Children’s Hospital Delaware, Wilmington, DE, USA
| | - Katherine Braley
- Nemours Cardiac Center, Nemours Children’s Hospital Florida, Orlando, FL, USA
| | | | - Jo Ann Davis
- Department of Pediatrics, Nationwide Children’s Hospital, Columbus, OH, USA
| | - Allison A Divanovic
- Department of Pediatrics, Cincinnati Children’s Hospital, Cincinnati, OH, USA
| | | | - Nadine Kasparian
- Center for Heart Disease and Mental Health, Department of Pediatrics, Cincinnati Children’s Hospital, Cincinnati, OH, USA
| | - Sarah L Kelly
- Departments of Pediatrics and Psychiatry, University of Colorado School of Medicine, Aurora, CO, USA
| | | | - Cynthia M Ortinau
- Department of Pediatrics, Washington University in St. Louis, St. Louis, MO, USA
| | - Erin Riegel
- Parent Research Partner, Wilmington, DE, USA
| | | | - Anne E Kazak
- Nemours Center for Healthcare Delivery Science, Nemours Children’s Hospital Delaware, Wilmington, DE, USA
- Department of Pediatrics, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
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Hansen K, Edwards LA, Yohannes K, Luong R, Lin A, Long J, Halpern-Felsher B, Cohen H, Kaufman BD. Advance Care Planning Preferences for Adolescents With Cardiac Disease. Pediatrics 2022; 149:184391. [PMID: 34984466 DOI: 10.1542/peds.2020-049902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/02/2021] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Adolescents with cardiac disease are at risk for life-changing complications and premature death. The importance of advance care planning (ACP) in adults with congenital heart disease and in pediatric patients with HIV and cancer has been demonstrated. ACP preferences of adolescents with heart disease have not been evaluated. We describe ACP preferences of adolescents with heart disease and compare with those of their caregivers. METHODS Outpatient adolescents aged 12 to 18 years with heart failure, cardiomyopathy, heart transplantation, or who were at risk for cardiomyopathy, as well as their caregivers, completed self-administered questionnaires which evaluated participants' opinions regarding content and timing of ACP discussions, preferences for end-of-life communication, and emotional responses to ACP. RESULTS Seventy-eight adolescents and 69 caregivers participated, forming 62 adolescent-caregiver dyads. Adolescents and caregivers reported that adolescent ACP discussions should occur early in the disease course (75% and 61%, respectively). Adolescents (92%) wanted to be told about terminal prognosis, whereas only 43% of caregivers wanted the doctor to tell their child this information. Most adolescents (72%) and caregivers (67%) anticipated that discussing ACP would make the adolescent feel relieved the medical team knew their wishes. Most caregivers (61%) believed that adolescents would feel stress associated with ACP discussions, whereas only 31% of adolescents anticipated this. CONCLUSIONS Adolescents and their caregivers agree that ACP should occur early in disease course. There are discrepancies regarding communication of prognosis and perceived adolescent stress related to ACP discussions. Facilitated conversations between patient, caregiver, and providers may align goals of care and communication preferences.
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Affiliation(s)
| | - Lindsay A Edwards
- Divisions of Cardiology.,Division of Cardiology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, Washington
| | | | | | - Amy Lin
- Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Jin Long
- Department of Medicine, Stanford University School of Medicine, Stanford, California
| | - Bonnie Halpern-Felsher
- Adolescent Medicine, Department of Pediatrics, Stanford University, Stanford, California
| | - Harvey Cohen
- Division of Hematology/Oncology, Lucile Packard Children's Hospital Stanford, Palo Alto, California
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Cacciottolo TM, Perikari A, van der Klaauw A, Henning E, Stadler LKJ, Keogh J, Farooqi IS, Tenin G, Keavney B, Ryan E, Budd R, Bewley M, Coelho P, Rumsey W, Sanchez Y, McCafferty J, Dockrell D, Walmsley S, Whyte M, Liu Y, Choy MK, Tenin G, Abraham S, Black G, Keavney B, Ford T, Stanley B, Good R, Rocchiccioli P, McEntegart M, Watkins S, Eteiba H, Shaukat A, Lindsay M, Robertson K, Hood S, McGeoch R, McDade R, Sidik N, McCartney P, Corcoran D, Collison D, Rush C, McConnachie A, Touyz R, Oldroyd K, Berry C, Gazdagh G, Diver L, Marshall J, McGowan R, Ahmed F, Tobias E, Curtis E, Parsons C, Maslin K, D'Angelo S, Moon R, Crozier S, Gossiel F, Bishop N, Kennedy S, Papageorghiou A, Fraser R, Gandhi S, Prentice A, Inskip H, Godfrey K, Schoenmakers I, Javaid MK, Eastell R, Cooper C, Harvey N, Watt ER, Howden A, Mirchandani A, Coelho P, Hukelmann JL, Sadiku P, Plant TM, Cantrell DA, Whyte MKB, Walmsley SR, Mordi I, Forteath C, Wong A, Mohan M, Palmer C, Doney A, Rena G, Lang C, Gray EH, Azarian S, Riva A, Edwards H, McPhail MJW, Williams R, Chokshi S, Patel VC, Edwards LA, Page D, Miossec M, Williams S, Monaghan R, Fotiou E, Santibanez-Koref M, Keavney B, Badat M, Mettananda S, Hua P, Schwessinger R, Hughes J, Higgs D, Davies J. Scientific Business Abstracts of the 113th Annual Meeting of the Association of Physicians of Great Britain and Ireland. QJM 2019; 112:724-729. [PMID: 31505685 DOI: 10.1093/qjmed/hcz175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - A Perikari
- University of Cambridge Metabolic Research Laboratories
| | | | - E Henning
- University of Cambridge Metabolic Research Laboratories
| | - L K J Stadler
- University of Cambridge Metabolic Research Laboratories
| | - J Keogh
- University of Cambridge Metabolic Research Laboratories
| | - I S Farooqi
- University of Cambridge Metabolic Research Laboratories
| | - G Tenin
- From University of Manchester
| | | | - E Ryan
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - R Budd
- Department of Infection Immunity and Cardiovascular Disease, The Florey Institute for Host-Pathogen Interactions, University of Sheffield
| | - M Bewley
- Department of Infection Immunity and Cardiovascular Disease, The Florey Institute for Host-Pathogen Interactions, University of Sheffield
| | - P Coelho
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - W Rumsey
- Stress and Repair Discovery Performance Unit, Respiratory Therapy Area
| | - Y Sanchez
- Stress and Repair Discovery Performance Unit, Respiratory Therapy Area
| | - J McCafferty
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - D Dockrell
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - S Walmsley
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - M Whyte
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - Y Liu
- From the University of Manchester
| | - M-K Choy
- From the University of Manchester
| | - G Tenin
- From the University of Manchester
| | | | - G Black
- From the University of Manchester
| | | | - T Ford
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | | | - R Good
- Golden Jubilee National Hospital
| | - P Rocchiccioli
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - M McEntegart
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | | | - H Eteiba
- Golden Jubilee National Hospital
| | | | | | | | - S Hood
- Golden Jubilee National Hospital
| | | | - R McDade
- Golden Jubilee National Hospital
| | - N Sidik
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - P McCartney
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - D Corcoran
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - D Collison
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - C Rush
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | | | - R Touyz
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
| | - K Oldroyd
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - Colin Berry
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - G Gazdagh
- School of Medicine, Dentistry & Nursing, College of Medical, Veterinary and Life Sciences, University of Glasgow
| | - L Diver
- West of Scotland Regional Genetics Service, Laboratory Medicine Building, Queen Elizabeth University Hospital
| | - J Marshall
- Institute of Cancer Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow
| | - R McGowan
- West of Scotland Regional Genetics Service, Laboratory Medicine Building, Queen Elizabeth University Hospital
| | - F Ahmed
- Developmental Endocrinology Research Group, Royal Hospital for Children, University of Glasgow
| | - E Tobias
- Academic Unit of Medical Genetics and Clinical Pathology, Laboratory Medicine Building, Queen Elizabeth University Hospital, University of Glasgow
| | - E Curtis
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - C Parsons
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - K Maslin
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - S D'Angelo
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - R Moon
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - S Crozier
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - F Gossiel
- Academic Unit of Bone Metabolism, University of Sheffield
| | - N Bishop
- Academic Unit of Child Health, University of Sheffield
| | - S Kennedy
- Nuffield Department of Women's & Reproductive Health, John Radcliffe Hospital, University of Oxford
| | - A Papageorghiou
- Nuffield Department of Women's & Reproductive Health, John Radcliffe Hospital, University of Oxford
| | - R Fraser
- Department of Obstetrics and Gynaecology, Sheffield Hospitals NHS Trust, University of Sheffield
| | - S Gandhi
- Department of Obstetrics and Gynaecology, Sheffield Hospitals NHS Trust, University of Sheffield
| | | | - H Inskip
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - K Godfrey
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - I Schoenmakers
- Department of Medicine, Faculty of Medicine and Health Sciences, University of East Anglia
| | - M K Javaid
- NIHR Oxford Biomedical Research Centre, University of Oxford
| | - R Eastell
- Academic Unit of Bone Metabolism, University of Sheffield
| | - C Cooper
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - N Harvey
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | | | - A Howden
- School of Life Sciences, University of Dundee
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - E H Gray
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - S Azarian
- Institute of Hepatology, Foundation for Liver Research
| | - A Riva
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - H Edwards
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - M J W McPhail
- School of Immunology and Microbial Sciences, King's College London
- Institute of Liver Studies & Transplantation, King's College Hospital
| | - R Williams
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - S Chokshi
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - V C Patel
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
- Institute of Liver Studies & Transplantation, King's College Hospital
| | - L A Edwards
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - D Page
- University of Manchester
- Manchester Metropolitan University
| | - M Miossec
- Manchester Metropolitan University
- University of Newcastle
| | | | | | | | | | | | - M Badat
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - S Mettananda
- Department of Paediatrics, Faculty of Medicine, University of Kelaniya
| | - P Hua
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - R Schwessinger
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - J Hughes
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - D Higgs
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - J Davies
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
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Edwards LA, Arunamata A, Maskatia SA, Quirin A, Bhombal S, Maeda K, Tacy TA, Punn R. Fetal Echocardiographic Parameters and Surgical Outcomes in Congenital Left-Sided Cardiac Lesions. Pediatr Cardiol 2019; 40:1304-1313. [PMID: 31338561 DOI: 10.1007/s00246-019-02155-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 07/10/2019] [Indexed: 10/26/2022]
Abstract
This study aimed to evaluate fetal echocardiographic parameters associated with neonatal intervention and single-ventricle palliation (SVP) in fetuses with suspected left-sided cardiac lesions. Initial fetal echocardiograms (1/2002-1/2017) were interpreted by the contemporary fetal cardiologist as coarctation of the aorta (COA), left heart hypoplasia (LHH), hypoplastic left heart syndrome (HLHS), mitral valve hypoplasia (MVH) ± stenosis, and aortic valve hypoplasia ± stenosis (AS). The cohort comprised 68 fetuses with suspected left-sided cardiac lesions (COA n = 15, LHH n = 9, HLHS n = 39, MVH n = 1, and AS n = 4). Smaller left ventricular (LV) length Z score, aortic valve Z score, ascending aorta Z score, and aorta/pulmonary artery ratio; left-to-right shunting at the foramen ovale; and retrograde flow in the aortic arch were associated with the need for neonatal intervention (p = 0.005-0.04). Smaller mitral valve (MV) Z score, LV length Z score, aortic valve Z score, ascending aorta Z score, aorta/pulmonary artery ratio, and LV ejection fraction, as well as higher tricuspid valve-to-MV (TV/MV) ratio, right ventricular-to-LV (RV/LV) length ratio, left-to-right shunting at the foramen ovale, abnormal pulmonary vein Doppler, absence of prograde aortic flow, and retrograde flow in the aortic arch were associated with SVP (p < 0.001-0.008). The strongest independent variable associated with SVP was RV/LV length ratio (stepwise logistical regression, p = 0.03); an RV/LV length ratio > 1.28 was associated with SVP with a sensitivity of 76% and specificity of 96% (AUC 0.90, p < 0.001). A fetal RV/LV length ratio of > 1.28 may be a useful threshold for identifying fetuses requiring SVP.
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Affiliation(s)
- Lindsay A Edwards
- Division of Cardiology, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Road, Suite 305, Palo Alto, CA, 94304, USA.
| | - Alisa Arunamata
- Division of Cardiology, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Road, Suite 305, Palo Alto, CA, 94304, USA
| | - Shiraz A Maskatia
- Division of Cardiology, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Road, Suite 305, Palo Alto, CA, 94304, USA
| | - Amy Quirin
- Division of Cardiology, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Road, Suite 305, Palo Alto, CA, 94304, USA
| | - Shazia Bhombal
- Division of Neonatology, Department of Pediatrics, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Katsuhide Maeda
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Theresa A Tacy
- Division of Cardiology, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Road, Suite 305, Palo Alto, CA, 94304, USA
| | - Rajesh Punn
- Division of Cardiology, Department of Pediatrics, Stanford University School of Medicine, 750 Welch Road, Suite 305, Palo Alto, CA, 94304, USA
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7
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Aggarwal V, Castellanos D, Becker JA, Edwards LA, Morris SA. Idiopathic congenital right atrial dilation: Fetal presentation. J Clin Ultrasound 2018; 46:553-554. [PMID: 29701295 DOI: 10.1002/jcu.22598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 02/12/2018] [Accepted: 03/28/2018] [Indexed: 06/08/2023]
Affiliation(s)
- Varun Aggarwal
- Texas Children's Hospital and Baylor College of Medicine, The Lillie Frank Abercrombie Section of Pediatric Cardiology, Houston, Texas
| | - Daniel Castellanos
- Texas Children's Hospital and Baylor College of Medicine, The Lillie Frank Abercrombie Section of Pediatric Cardiology, Houston, Texas
| | - Judith A Becker
- Texas Children's Hospital and Baylor College of Medicine, The Lillie Frank Abercrombie Section of Pediatric Cardiology, Houston, Texas
| | - Lindsay A Edwards
- Texas Children's Hospital and Baylor College of Medicine, The Lillie Frank Abercrombie Section of Pediatric Cardiology, Houston, Texas
| | - Shaine A Morris
- Texas Children's Hospital and Baylor College of Medicine, The Lillie Frank Abercrombie Section of Pediatric Cardiology, Houston, Texas
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8
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Edwards LA, Lara DA, Sanz Cortes M, Hunter JV, Andreas S, Nguyen MJ, Schoppe LJ, Zhang J, Smith EM, Maskatia SA, Sexson-Tejtel SK, Lopez KN, Lawrence EJ, Wang Y, Challman M, Ayres NA, Altman CA, Aagaard K, Becker JA, Morris SA. Chronic Maternal Hyperoxygenation and Effect on Cerebral and Placental Vasoregulation and Neurodevelopment in Fetuses with Left Heart Hypoplasia. Fetal Diagn Ther 2018; 46:45-57. [PMID: 30223262 DOI: 10.1159/000489123] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 04/09/2018] [Indexed: 11/19/2022]
Abstract
INTRODUCTION In a pilot study of chronic maternal hyperoxygenation (CMH) in left heart hypoplasia (LHH), we sought to determine effect estimates of CMH on head size, vascular resistance indices, and neurodevelopment compared to controls. MATERIAL AND METHODS Nine gravidae meeting the inclusion criteria (fetal LHH, ≥25.9 weeks' gestation, and ≥10% increase in percent aortic flow after acute hyperoxygenation) were prospectively enrolled. Controls were 9 contemporary gravidae with fetal LHH without CMH. Brain growth and Doppler-derived estimates of fetal cerebrovascular and placental resistance were blindly evaluated and compared using longitudinal regression. Postnatal anthropomorphic and neurodevelopmental assessments were compared. RESULTS There was no difference in baseline fetal measures between groups. There was significantly slower biparietal diameter (BPD) growth in the CMH group (z-score change -0.03 ± 0.02 vs. +0.09 ± 0.05 units/week, p = 0.02). At 6 months postnatal age, the mean head circumference z-score in the CMH group was smaller than that of controls (-0.20 ± 0.58 vs. +0.85 ± 1.11, p = 0.048). There were no differences in neurodevelopmental testing at 6 and 12 months. DISCUSSION In this pilot study, relatively diminished fetal BPD growth and smaller infant head circumference z-scores at 6 months were noted with in utero CMH exposure.
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Affiliation(s)
- Lindsay A Edwards
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Diego A Lara
- Division of Pediatric Cardiology, Ochsner Hospital for Children, New Orleans, Louisiana, USA
| | - Magdalena Sanz Cortes
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA
| | - Jill V Hunter
- Department of Radiology, Baylor College of Medicine, Houston, Texas, USA
| | - Shelley Andreas
- Cardiovascular Clinical Research Core, Baylor College of Medicine, Houston, Texas, USA
| | | | - Lacey J Schoppe
- Fetal Center, Texas Children's Hospital, Houston, Texas, USA
| | - Jianhong Zhang
- Fetal Center, Texas Children's Hospital, Houston, Texas, USA
| | - Eboni M Smith
- Section of Developmental Pediatrics, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Shiraz A Maskatia
- Section of Cardiology, Department of Pediatrics, Stanford University Medical Center, Stanford, California, USA
| | - S Kristen Sexson-Tejtel
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Keila N Lopez
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Emily J Lawrence
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Yunfei Wang
- Cardiovascular Clinical Research Core, Baylor College of Medicine, Houston, Texas, USA
| | - Melissa Challman
- Cardiovascular Clinical Research Core, Baylor College of Medicine, Houston, Texas, USA
| | - Nancy A Ayres
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Carolyn A Altman
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Kjersti Aagaard
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas, USA
| | - Judith A Becker
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Shaine A Morris
- Section of Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA,
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9
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Edwards LA, Bui C, Cabrera AG, Jarrell JA. Improving outpatient advance care planning for adults with congenital or pediatric heart disease followed in a pediatric heart failure and transplant clinic. CONGENIT HEART DIS 2018; 13:362-368. [DOI: 10.1111/chd.12579] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 12/26/2017] [Indexed: 11/29/2022]
Affiliation(s)
- Lindsay A. Edwards
- Texas Children's Hospital; Lillie Frank Abercrombie Section of Pediatric Cardiology; Houston Texas USA
- Department of Pediatrics; Baylor College of Medicine; Houston Texas USA
| | - Christine Bui
- Department of Pediatrics; Baylor College of Medicine; Houston Texas USA
- Department of Medicine; Baylor College of Medicine; Houston Texas USA
| | - Antonio G. Cabrera
- Texas Children's Hospital; Lillie Frank Abercrombie Section of Pediatric Cardiology; Houston Texas USA
- Department of Pediatrics; Baylor College of Medicine; Houston Texas USA
| | - Jill Ann Jarrell
- Department of Pediatrics; Baylor College of Medicine; Houston Texas USA
- Section of Academic General Pediatrics; Texas Children's Hospital; Houston Texas USA
- Texas Children's Hospital; Section of Palliative Care; Houston Texas USA
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10
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Edwards LA, Masand P, Morris SA. Atypical Circular Shunt and Diffuse Emphysema in a Fetus with Double-Outlet Right Ventricle and Absent Pulmonary Valve. ACTA ACUST UNITED AC 2017; 1:237-241. [PMID: 30062290 PMCID: PMC6058304 DOI: 10.1016/j.case.2017.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
APVS is usually associated with agenesis of the ductus arteriosus. APVS is frequently accompanied by dilation of the main and branch pulmonary arteries, often leading to tracheal and bronchial compression with varying degrees of respiratory distress. A rare variation of APVS with circular shunt physiology is reported, expanding the clinical spectrum of the disease.
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Affiliation(s)
- Lindsay A Edwards
- Department of Pediatric Cardiology, Texas Children's Hospital and Baylor College of Medicine, Houston, Texas
| | - Prakash Masand
- Department of Pediatric Radiology, Texas Children's Hospital and Baylor College of Medicine, Houston, Texas
| | - Shaine A Morris
- Department of Pediatric Cardiology, Texas Children's Hospital and Baylor College of Medicine, Houston, Texas
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11
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Edwards EA, Lumsden J, Rivas C, Steed L, Edwards LA, Thiyagarajan A, Sohanpal R, Caton H, Griffiths CJ, Munafò MR, Taylor S, Walton RT. Gamification for health promotion: systematic review of behaviour change techniques in smartphone apps. BMJ Open 2016; 6:e012447. [PMID: 27707829 PMCID: PMC5073629 DOI: 10.1136/bmjopen-2016-012447] [Citation(s) in RCA: 187] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
OBJECTIVE Smartphone games that aim to alter health behaviours are common, but there is uncertainty about how to achieve this. We systematically reviewed health apps containing gaming elements analysing their embedded behaviour change techniques. METHODS Two trained researchers independently coded apps for behaviour change techniques using a standard taxonomy. We explored associations with user ratings and price. DATA SOURCES We screened the National Health Service (NHS) Health Apps Library and all top-rated medical, health and wellness and health and fitness apps (defined by Apple and Google Play stores based on revenue and downloads). We included free and paid English language apps using 'gamification' (rewards, prizes, avatars, badges, leaderboards, competitions, levelling-up or health-related challenges). We excluded apps targeting health professionals. RESULTS 64 of 1680 (4%) health apps included gamification and met inclusion criteria; only 3 of these were in the NHS Library. Behaviour change categories used were: feedback and monitoring (n=60, 94% of apps), reward and threat (n=52, 81%), and goals and planning (n=52, 81%). Individual techniques were: self-monitoring of behaviour (n=55, 86%), non-specific reward (n=49, 82%), social support unspecified (n=48, 75%), non-specific incentive (n=49, 82%) and focus on past success (n=47, 73%). Median number of techniques per app was 14 (range: 5-22). Common combinations were: goal setting, self-monitoring, non-specific reward and non-specific incentive (n=35, 55%); goal setting, self-monitoring and focus on past success (n=33, 52%). There was no correlation between number of techniques and user ratings (p=0.07; rs=0.23) or price (p=0.45; rs=0.10). CONCLUSIONS Few health apps currently employ gamification and there is a wide variation in the use of behaviour change techniques, which may limit potential to improve health outcomes. We found no correlation between user rating (a possible proxy for health benefits) and game content or price. Further research is required to evaluate effective behaviour change techniques and to assess clinical outcomes. TRIAL REGISTRATION NUMBER CRD42015029841.
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Affiliation(s)
- E A Edwards
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - J Lumsden
- School of Experimental Psychology, University of Bristol, Bristol, UK MRC Integrative Epidemiology Unit at the University of Bristol, Bristol, UK
| | - C Rivas
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK Faculty of Health Sciences, University of Southampton, Southampton, UK
| | - L Steed
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - L A Edwards
- Institute of Liver Studies, King's College Hospital, London, UK
| | - A Thiyagarajan
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - R Sohanpal
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - H Caton
- Department of Computing and Information Systems, Kingston University, London, UK
| | - C J Griffiths
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - M R Munafò
- School of Experimental Psychology, University of Bristol, Bristol, UK MRC Integrative Epidemiology Unit at the University of Bristol, Bristol, UK
| | - S Taylor
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - R T Walton
- Centre for Primary Care and Public Health, Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
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12
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Nowocin AK, Brown K, Edwards LA, Meader L, Hill JI, Wong W. An Extraperitoneal Technique for Murine Heterotopic Cardiac Transplantation. Am J Transplant 2015; 15:2491-4. [PMID: 25997384 DOI: 10.1111/ajt.13307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 02/23/2015] [Accepted: 03/05/2015] [Indexed: 01/25/2023]
Abstract
The mouse heterotopic cardiac transplantation model has been used extensively by investigators in the field of organ transplantation to study the rejection process, test new antirejection treatments, tolerance induction protocols or to understand basic immunological principles. Due to its extensive use, any small refinement of the technique would have a major impact on replacement, reduction and refinement (commonly known as the 3Rs). Here, we describe a novel approach to refine this model. The donor aorta and pulmonary artery are anastomosed peripherally to the femoral artery and vein of the recipient, respectively. The technical success rate is comparable to the conventional abdominal site, but it avoids a laparotomy and handling of the bowels making it less invasive method. As a result, recipients recover faster and require less postoperative analgesia. It is a major refinement under one of the 3Rs and would represent an advance in animal welfare in scientific research.
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Affiliation(s)
- A K Nowocin
- Medical Research Council (MRC) Centre for Transplantation, King's College London, London, UK
| | - K Brown
- Medical Research Council (MRC) Centre for Transplantation, King's College London, London, UK
| | - L A Edwards
- Medical Research Council (MRC) Centre for Transplantation, King's College London, London, UK
| | - L Meader
- Medical Research Council (MRC) Centre for Transplantation, King's College London, London, UK
| | - J I Hill
- Medical Research Council (MRC) Centre for Transplantation, King's College London, London, UK
| | - W Wong
- Medical Research Council (MRC) Centre for Transplantation, King's College London, London, UK
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13
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Edwards LA, Lucas M, Edwards EA, Torrente F, Heuschkel RB, Klein NJ, Murch SH, Bajaj-Elliott M, Phillips AD. Aberrant response to commensal Bacteroides thetaiotaomicron in Crohn's disease: an ex vivo human organ culture study. Inflamm Bowel Dis 2011; 17:1201-8. [PMID: 21484962 DOI: 10.1002/ibd.21501] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Accepted: 08/23/2010] [Indexed: 12/15/2022]
Abstract
BACKGROUND Human ex vivo evidence indicating that an inappropriate immune response(s) to nonpathogenic bacteria contributes to disease pathogenesis in pediatric Crohn's disease (CD) is limited. The aim of the present study was to compare and contrast the early innate immune response of pediatric "healthy" versus CD mucosa to pathogenic, probiotic, and commensal bacteria. METHODS "Healthy control" and CD pediatric mucosal biopsies (terminal ileum and transverse colon) were cocultured for 8 hours with E. coli O42, Lactobacillus GG (LGG), Bacteroidesthetaiotaomicron (B. theta), or stimulated with interleukin (IL)-1β (positive control). Matched nonstimulated biopsies served as experimental controls. IL-8 was the immune marker of choice. IL-8 mRNA and protein levels were quantified by quantitative polymerase chain reaction and sandwich enzyme-linked immunosorbent assay, respectively. RESULTS IL-8 secretion was observed when control, ileal biopsies were exposed to pathogenic O42 and probiotic LGG, with no response noted to commensal B. theta. In comparison, Crohn's ileal biopsies showed impaired ability to induce IL-8 in response to O42 and LGG. Control colonic tissue showed a limited response to O42 or B. theta and LGG significantly reduced IL-8 secretion. Unlike control tissue, however, Crohn's ileal and colonic tissue did respond to B. theta, with more enhanced expression in the colon. CONCLUSIONS We provide the first ex vivo data to support the notion that aberrant mucosal recognition of commensal bacteria may contribute to pediatric CD. While IL-8 responses to O42 and LGG varied with disease status and anatomical location, B. theta consistently induced significant IL-8 both in ileal and colonic CD tissue, which was not seen in control, healthy tissue.
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Affiliation(s)
- L A Edwards
- Centre for Paediatric Gastroenterology, Lower Ground Floor, Royal Free Hospital, London, UK.
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14
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Rowland RE, Edwards LA, Podd JV. Elevated sister chromatid exchange frequencies in New Zealand Vietnam War veterans. Cytogenet Genome Res 2007; 116:248-51. [PMID: 17431321 DOI: 10.1159/000100407] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2006] [Accepted: 12/15/2006] [Indexed: 11/19/2022] Open
Abstract
From July 1965 until November 1971, New Zealand Defence Force Personnel fought in the Vietnam War. During this time more than 76,500,000 litres of phenoxylic herbicides were sprayed over parts of Southern Vietnam and Laos, the most common being known as 'Agent Orange'. The current study aimed to ascertain whether or not New Zealand Vietnam War veterans show evidence of genetic disturbance arising as a consequence of their now confirmed exposure to these defoliants. A sample group of 24 New Zealand Vietnam War veterans and 23 control volunteers were compared using an SCE (sister chromatid exchange) analysis. The results from the SCE study show a highly significant difference (P < 0.001) between the mean of the experimental group (11.05) and the mean of a matched control group (8.18). The experimental group also has an exceptionally high proportion of HFCs (cells with high SCE frequencies) above the 95th percentile compared to the controls (11.0 and 0.07%, respectively). We conclude that the New Zealand Vietnam War veterans studied here were exposed to a clastogenic substance(s) which continues to exert an observable genetic effect today, and suggest that this is attributable to their service in Vietnam.
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Affiliation(s)
- R E Rowland
- Institute of Molecular Biosciences, Massey University, Palmerston North, New Zealand.
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15
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Stoll B, Edwards LA. Critical Incident Stress Management with inmates: an atypical application. Int J Emerg Ment Health 2002; 3:245-7. [PMID: 12025484] [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] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
In March 2001, Centerstone Community Mental Health Centers, Inc.'s CISM Team was asked to debrief 14 inmates after a murder in a rural county jail. We had no specific experience providing CISM in this particular setting, so we contacted ICISF and local law enforcement personnel for their input. We found that neither had a significant amount of experience with this population. In general, although our Team found significant differences related to the restrictions inherent in the environmental setting and the overall group dynamic, we also found similarities in the general manner in which the CISM model was utilized.
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Affiliation(s)
- B Stoll
- Centerstone Community Mental Health Centers, Inc., Nashville, TN, USA
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16
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Abstract
Aside from their ability to bind to multiple antigens, the classic hallmark of polyreactive antibodies is their autoreactivity. Because of their ability to bind a number of common autoantigens, it has long been speculated that polyreactive antibodies are involved in the clearance of self-antigens. However, it has been demonstrated more recently that polyreactive antibodies are also capable of binding to some foreign and synthetic antigens. Although data regarding the relative reactivity of polyreactive antibodies with self versus foreign antigens is lacking, it is generally thought that both activities may play an important biological role. In this study, the relative reactivity of polyclonal human polyreactive IgM with human proteins and tissue extracts versus foreign (xenogeneic) proteins and tissue extracts was probed. The binding of affinity purified anti-ssDNA IgM from adult human serum and the binding of polyreactive IgM in human cord serum and in human adult serum were evaluated. Using competitive and direct binding assays, human polyreactive IgM were found to be generally more reactive with foreign (xenogeneic) proteins than with self or allogeneic proteins. These data shed light on the fundamental nature of polyreactive antibodies, and may provide additional insight into their putative biological roles.
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Affiliation(s)
- Winston Lee
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
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17
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Edwards LA, Read LC, Nishio SJ, Weir AJ, Hull W, Barry S, Styne D, Whitsett JA, Tarantal AF, George-Nascimento C. Comparison of the distinct effects of epidermal growth factor and betamethasone on the morphogenesis of the gas exchange region and differentiation of alveolar type II cells in lungs of fetal rhesus monkeys. J Pharmacol Exp Ther 1995; 274:1025-32. [PMID: 7636717] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
To compare the effects of epidermal growth factor (EGF) and betamethasone on the morphogenesis of the gas exchange region and the differentiation of the alveolar type II cell during fetal lung development, fetal rhesus monkeys (78% gestation) were treated in utero with EGF (5.33 mg/kg total dose), beta-methasone (2.6 mg/kg total dose) or the carrier, saline (control), every other day for 7 days. EGF-treated monkeys had significantly increased body and adrenal weights. Betamethasone-treated monkeys had significantly decreased body and adrenal weights. Exogenous EGF reduced cytoplasmic glycogen and increased the cytoplasmic organelle and SP-A content within alveolar type II cells. In contrast, exogenous betamethasone did not alter alveolar type II cell cytodifferentiation. Neither EGF nor betamethasone treatment significantly altered the structure of the gas exchange region as shown by a lack of change from controls in alveolar airspace size or in the fraction of the gas exchange region that was potential airspace. We conclude that at clinically relevant doses, EGF greatly accelerates the maturation of alveolar type II cells, whereas betamethasone does not. Exogenous EGF may act directly on alveolar type II cells because these cells contain EGF receptor. Neither EGF nor betamethasone had dramatic effects on the morphogenesis of the gas exchange region.
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Affiliation(s)
- L A Edwards
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, USA
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18
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Affiliation(s)
- L A Edwards
- Family Medicine Programme, North Adelaide, SA
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19
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Martinez-Bilbao M, Holdsworth RE, Edwards LA, Huber RE. A highly reactive beta-galactosidase (Escherichia coli) resulting from a substitution of an aspartic acid for Gly-794. J Biol Chem 1991; 266:4979-86. [PMID: 1900512] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The beta-galactosidases of several mutagenized strains of Escherichia coli K12 which grew on lactobionate were found to be heat labile. Sequence analysis of the lacZ gene (ligated into Bluescript) of one of these strains (E. coli REH4) showed that the only change in the amino acid sequence was a substitution of an Asp for Gly-794. This change caused a dramatic increase of the activity when lactose was the substrate. The kcat of the purified enzyme from E. coli REH4 (G794D-beta-galactosidase) with lactose as the substrate was five to six times as large as the kcat of the normal enzyme with lactose. Purified G794D-beta-galactosidase was, however, less stable to heat and also to chymotrypsin (which cleaves next to Trp-585) than was normal beta-galactosidase. G794D-beta-Galactosidase bound substrates and substrate analog inhibitors less well than did normal beta-galactosidase while planar transition state analog inhibitors were more strongly bound. The ability to bind 2-amino-D-galactose (a positively charged transition state analog inhibitor) was either unaltered or was decreased somewhat. The data showed that the alteration in structure caused an increase in the value of k2 (the rate constant for the step in which the glycosidic bond is cleaved) with each substrate tested (the increase was at least 25-fold when lactose was the substrate) while k3 was decreased about 4-fold (k3 is the rate constant for the common hydrolysis step with each substrate). Since k2 is rate determining when lactose is the substrate of the normal enzyme, the increase in k2 resulted in a large increase in rate despite the fact that the value of k3 decreased. Large rate increases were not found with the other two substrates because the k2 values were not increased by large factors and because the decrease in the value of k3 negated the effects of the increased k2 values. The destabilization of the substrate binding coupled with a stabilization of the binding of a planar transition state is a possible cause of the significant increase in the value of k2 and of the enhanced activity with lactose.
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Affiliation(s)
- M Martinez-Bilbao
- Division of Biochemistry, Faculty of Science, University of Calgary, Alberta, Canada
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Abstract
Electrical field stimulation of dog isolated basilar artery produced neurogenically mediated contractions which were unaffected by phentolamine (1 microM), atropine (1 microM), ketanserin (1 microM) or methiothepin (0.1 microM). Responses were abolished by GR32191 (1-10 nM), BM 13.177 (0.1-10 microM) or flurbiprofen (0.5 microM) and markedly attenuated by dazoxiben (1-10 microM). Removal of the endothelium by Triton X-100-perfusion did not modify the magnitude of contractions to electrical stimulation and GR32191 still abolished the responses. GR32191 (1-10 nM) did not modify neurogenically mediated contraction of rabbit ear artery or potassium chloride-induced contraction of dog basilar artery. The results suggest that electrical field stimulation of dog basilar artery causes contractions which are mediated via a cyclo-oxygenase product with characteristics similar to thromboxane. This thromboxane-like substance is not endothelial in origin, nor released by contraction of the cerebrovascular smooth muscle per se and is therefore derived from a subendothelial, possibly neuronal, source.
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Affiliation(s)
- H E Connor
- Department of Cardiovascular Pharmacology, Glaxo Group Research Ltd., Ware, Hertfordshire, U.K
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22
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Ellis JS, Jennings AC, Edwards LA, Mavandad M, Lamb CJ, Dixon RA. Defense gene expression in elicitor-treated cell suspension cultures of french bean cv. Imuna. Plant Cell Rep 1989; 8:504-507. [PMID: 24233540 DOI: 10.1007/bf00269060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/1989] [Revised: 10/03/1989] [Indexed: 06/02/2023]
Abstract
Cell suspension cultures of bean (Phaseolus vulgaris) cv. Imuna accumulated isoflavonoid phytoalexins on exposure to elicitor from the phytopathogenic fungus Colletotrichum lindemuthianum (CL). This was preceeded by rapid increases in the activities of phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS). However, the patterns of expression of PAL and CHS genes differed from those observed in cultures of a previously studied bean cultivar. The relative levels of transcripts from individual members of the CHS multigene family differed significantly at 1.5 h compared to 22.5 h after elicitation. More strikingly, three PAL genes were expressed in cultivar Imuna in response to fungal elicitor, whereas two are expressed in elicitor-treated cell cultures of cultivar Canadian Wonder.
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Affiliation(s)
- J S Ellis
- Department of Biochemistry, Royal Holloway and Bedford New College, University of London, Egham Hill, TW20 OEX, Egham, Surrey, UK
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Huber RE, Edwards LA, Carne TJ. Studies on the mechanism of the iodination of tyrosine by lactoperoxidase. J Biol Chem 1989; 264:1381-6. [PMID: 2912960] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Studies with lactoperoxidase showed that a highly reactive intermediate is produced (on the enzyme) from I- and H2O2 which then diffuses from the enzyme and very rapidly and indiscriminately iodinates any Tyr or peptides containing Tyr which are in the same solution. The evidence supporting these conclusions follows. 1) The rate followed the Michaelis-Menten pattern with I- and H2O2 while the concentration of Tyr peptides had no measurable effect on the rate; 2) the rates of reaction were independent of the type of peptide in which Tyr was located; 3) the amount of iodination which had occurred after the reaction had gone to completion and the amounts of monoiodination and diiodination after completion of the reaction were independent of the peptide type, the pH, the solvent polarity, or the ionic strength; 4) competition for reaction by two very different Tyr peptides depended only on their initial concentrations; and 5) iodination of a large protein occurred through a dialysis membrane. Free Tyr was iodinated at the same rate as Tyr peptides by lactoperoxidase, but monoiodotyrosine and m-fluorotyrosine were iodinated at one-half that rate. The results also showed that one can choose ratios of [peptide] to [H2O2] such that monoiodination is maximized relative to diiodination. It was also found that the iodination capacity of a mixture of I- and H2O2 with lactoperoxidase (when Tyr was absent) was only slowly dissipated. Finally, the results showed that lactoperoxidase can be used to brominate and chlorinate Tyr peptides at a slow rate.
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Affiliation(s)
- R E Huber
- Division of Biochemistry, Faculty of Science, University of Calgary, Alberta, Canada
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24
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Edwards LA, Tian MR, Huber RE, Fowler AV. The use of limited proteolysis to probe interdomain and active site regions of beta-galactosidase (Escherichia coli). J Biol Chem 1988; 263:1848-54. [PMID: 3123481] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Limited proteolysis by pancreatic elastase (EC 3.4.21.36) and chymotrypsin (EC 3.4.21.1) was used to study the domain structure and active site of beta-galactosidase (EC 3.2.1.23) (Escherichia coli). Treatment with elastase resulted in a rapid cleavage between residues Ala-732 and Ala-733. No inactivation accompanied this cleavage suggesting that this bond is in a hinge region of the protein. Some slow cleavages beyond the initial one were observed to occur and were accompanied by inactivation. Treatment of beta-galactosidase with chymotrypsin resulted in cleavages first between Trp-585 and Ser-586 and then between Phe-601 and Cys-602. The first of these cleavages resulted in total inactivation of beta-galactosidase. The presence of monovalent ions or isopropyl-beta-D-thiogalactopyranoside protected against the cleavages but when Mg2+ or Mn2+ was present in the reaction mixture, the bond between Trp-585 and Ser-586 was more susceptible to the action of chymotrypsin. These data demonstrate that the conformation of beta-galactosidase around Trp-585 and Ser-586 is dramatically affected by the binding of ions and isopropyl-beta-D-thiogalactopyranoside. The mutant M15 beta-galactosidase, which is missing residues 11 through 41 and is an inactive dimer rather than an active tetramer, was found to be much more labile to proteases than native beta-galactosidase, but the same initial cleavages were found to occur. In addition, trypsin cleaved the M15 protein between Arg-431 and Trp-432 while native beta-galactosidase was stable to trypsin.
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Affiliation(s)
- L A Edwards
- Department of Biological Sciences, University of Calgary, Alberta, Canada
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Edwards LA, Tian MR, Huber RE, Fowler AV. The use of limited proteolysis to probe interdomain and active site regions of beta-galactosidase (Escherichia coli). J Biol Chem 1988. [DOI: 10.1016/s0021-9258(19)77954-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Abstract
Separation of tyrosine, fluorotyrosine, monoiodotyrosine and diiodotyrosine was achieved by reversed-phase high-performance liquid chromatography (HPLC) using a gradient of acetonitrile with water and using trifluoroacetic acid for ion pairing. No derivatization of the amino acids, prior to separation, was needed. The spectral properties of Tyr and its fluorine and iodine derivatives and the dependence of their absorbance maxima on pH, made it possible to analyze and differentiate between these derivatives in the free amino acid form or in peptides. This analysis was accomplished by adjusting the post column HPLC eluate from two identical runs to different pH values and then comparing the spectra of the peaks from these two runs with a diode array detector. Hydrolysis in 6 M hydrochloric acid was totally destructive to mono- and diiodotyrosine. However, base hydrolysis in 13.5 M sodium hydroxide for 30 min at 121 degrees C in an autoclave caused no destruction and allowed excellent recovery of all of the Tyr derivatives. This is the first report of simple methods for the detection and analysis of these amino acids and of a hydrolytic method which protects against their loss. A method of storage was also proposed.
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Edwards LA, Huber RE. A detailed examination of the iodination of beta-galactosidase: stoichiometric inactivation by nonspecific iodination. Biochem Cell Biol 1986; 64:523-7. [PMID: 3091051 DOI: 10.1139/o86-073] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The incorporation of 125I, using lactoperoxidase, and the subsequent inactivation of beta-galactosidase in the period when incorporation and inactivation were stoichiometric were investigated in detail. The high pressure liquid chromatographic (HPLC) radioactive profiles of the tryptic peptides of samples taken in the stoichiometric period showed that, although two labelled peptides predominated, there were other labelled peptides. The predominating peptides were shown to be the mono- and di-iodinated forms of the peptide containing Tyr-253. This confirmed the result of an earlier study, but quantitation showed that this iodination accounted for only 15-18% of the total. To show that the other labelled peptides in the HPLC profiles were not merely oxidized or partially digested forms of the peptide containing Tyr-253, two experiments were carried out. In one of the experiments, two of the other labelled peptides were isolated and identified as iodinated forms of the peptide containing Tyr-285 (5-7% of the incorporation). In the other experiment, four additional labelled fractions from the HPLC eluate were treated further with trypsin. No further digestion was observed and thus these peptides did not result from incomplete digestion of the sequence containing Tyr-253. Overall, these results show that, although the incorporation of 125I was stoichiometric with inactivation, no single Tyr was responsible for the inactivation as was tentatively suggested previously. The competitive inhibitor isopropyl-beta-D-thiogalactopyranoside (IPTG) was effective in reducing the rates of inactivation of the enzyme and incorporation of 125I, but the same peptides were labelled in the presence of IPTG as in its absence.
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Muhitch MJ, Edwards LA, Fletcher JS. Influence of diamines and polyamines on the senescence of plant suspension cultures. Plant Cell Rep 1983; 2:82-84. [PMID: 24257954 DOI: 10.1007/bf00270171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/1982] [Indexed: 06/02/2023]
Abstract
The diamines putrescine and cadaverine and the polyamines spermine and spermidine inhibited the senescence of nonphotosynthetic cultures of Paul's Scarlet rose. Response was observed when the media of stationary phase cultures was adjusted to either 1 mM of cadaverine or putrescine; or 0.1 μM of either spermine or spermidine along with 2% sucrose in all cases. Senescence of the cultures was followed by microscopic examination of cell aliquots removed at 10 day intervals and treated with the vital stain, fluorescein diacetate.
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Affiliation(s)
- M J Muhitch
- Department of Botany and Microbiology, University of Oklahoma, 73019, Norman, OK, USA
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Edwards LA. Symposium on diarrhea. 6. Infectious diarrhea. Can Med Assoc J 1977; 116:753-5. [PMID: 849557 PMCID: PMC1879424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Diarrhea may be primarily infectious in origin. Causes can be conveniently classified according to the etiologic agent, which may be viral, chlamydial, bacterial, protozoal, helminthic or fungal. The most common type of infectious diarrhea in Canada is viral. Bacterial infection, particularly staphylococcal and salmonellal, also is relatively common.
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Abstract
Two cases of meglumine iodipamide (Cholografin) hepatotoxicity were confirmed by liver biopsy. The hepatic lesion was centrilobular in location and resolved within a short period of time. Nausea and vomiting commonly reported after intravenous cholangiography may be clinical manifestations of this entity.
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Edwards LA, Hilliard JR, Wood DE. Axillary vein thrombosis and pulmonary embolism possibly due to oral contraception. Can Med Assoc J 1969; 100:78-80. [PMID: 5762476 PMCID: PMC1945510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Hawley CA, Detmer JE, Edwards LA. An electronic data processing method for rapid assessment of potential off-site radiological effects. Health Phys 1966; 12:1356-1362. [PMID: 5970988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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