1
|
Kirkby S, Nicholson K, Boyer D, Cohen S, Baker P, Galantowicz M, McConnell P. Donor Derived Cell-Free DNA as a Marker of Allograft Dysfunction in Pediatric Lung Transplant Recipients. J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
|
2
|
Girault C, Boyer D, Jolly G, Carpentier D, Béduneau G, Frat JP. Principes de fonctionnement, effets physiologiques et aspects pratiques de l’oxygénothérapie à haut débit. Rev Mal Respir 2022; 39:455-468. [DOI: 10.1016/j.rmr.2022.03.012] [Citation(s) in RCA: 1] [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] [Received: 12/29/2021] [Accepted: 03/27/2022] [Indexed: 12/29/2022]
|
3
|
Beduneau G, Boyer D, Guitard PG, Gouin P, Carpentier D, Grangé S, Veber B, Girault C, Tamion F. Covid-19 severe hypoxemic pneumonia: A clinical experience using high-flow nasal oxygen therapy as first-line management. Respir Med Res 2021; 80:100834. [PMID: 34153702 PMCID: PMC8175099 DOI: 10.1016/j.resmer.2021.100834] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 05/03/2021] [Accepted: 05/18/2021] [Indexed: 01/16/2023]
Abstract
PURPOSE To report a French experience in patients admitted to Intensive Care Unit (ICU) for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) requiring high fractional concentration of inspired oxygen supported by high flow nasal cannula (HFNC) as first-line therapy. METHODS Retrospective cohort study conducted in two ICUs of a French university hospital. All consecutive patients admitted during 28-days after the first admission for SARS-CoV-2 pneumonia were screened. Demographic, clinical, respiratory support, specific therapeutics, ICU length-of-stay and survival data were collected. RESULTS Data of 43 patients were analyzed: mainly men (72%), median age 61 (51-69) years, median body mass index of 28 (25-31) kg/m2, median simplified acute physiology score (SAPS II) of 29 (22-37) and median PaO2/fraction of inspired oxygen (FiO2) (P/F) ratio of 146 (100-189) mmHg. HFNC was initiated at ICU admission in 76% of patients. Median flow was 50 (45-50) L/min and median FiO2 was 0.6 (0.5-0.8). 79% of patients presented at least one comorbidity, mainly hypertension (58%). At day (D) 28, 32% of patients required invasive mechanical ventilation, 3 patients died in ICU. Risk factors for intubation were diabetes (10% vs. 43%, P=0.04) and extensive lesions on chest computed tomography (CT) (P=0.023). Patients with more than 25% of lesions on chest CT were more frequently intubated during ICU stay (P=0.012). At ICU admission (D1), patients with higher SAPS II and Sequential Organ Failure Assessment (SOFA) scores (respectively 39 (28-50) vs. 27 (22-31), P=0.0031 and 5 (2-8) vs. 2 (2-2.2), P=0.0019), and a lower P/F ratio (98 (63-109) vs. 178 (126-206), P=0.0005) were more frequently intubated. Among non-intubated patients, the median lowest P/F was 131 (85-180) mmHg. Four caregivers had to stop working following coronavirus 2 contamination, but did not require hospitalization. CONCLUSION Our clinical experience supports the use of HFNC as first line-therapy in patients with SARS-COV-2 pneumonia for whom face mask oxygen does not provide adequate respiratory support.
Collapse
Affiliation(s)
- G Beduneau
- UNIROUEN, EA 3830, medical intensive care unit, Rouen university hospital, Normandie university, 76000 Rouen, France.
| | - D Boyer
- Medical intensive care unit, Rouen university hospital, 76000 Rouen, France
| | - P-G Guitard
- Department of anesthesiology and critical care, Rouen university hospital, 76000 Rouen, France
| | - P Gouin
- Department of anesthesiology and critical care, Rouen university hospital, 76000 Rouen, France
| | - D Carpentier
- Medical intensive care unit, Rouen university hospital, 76000 Rouen, France
| | - S Grangé
- Medical intensive care unit, Rouen university hospital, 76000 Rouen, France
| | - B Veber
- Department of anesthesiology and critical care, Rouen university hospital, 76000 Rouen, France
| | - C Girault
- UNIROUEN, EA 3830, medical intensive care unit, Rouen university hospital, Normandie university, 76000 Rouen, France
| | - F Tamion
- UNIROUEN, Inserm U1096, medical intensive care unit, Rouen university hospital, Normandie university, 76000 Rouen, France
| |
Collapse
|
4
|
Ho AD, Verkerke H, Allen JW, Saeedi BJ, Boyer D, Owens J, Shin S, Horwath M, Patel K, Paul A, Wu SC, Chonat S, Zerra P, Lough C, Roback JD, Neish A, Josephson CD, Arthur CM, Stowell SR. An automated approach to determine antibody endpoint titers for COVID-19 by an enzyme-linked immunosorbent assay. Immunohematology 2021; 37:33-43. [PMID: 33962490 DOI: 10.21307/immunohematology-2021-007] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
While a variety of therapeutic options continue to emerge for COVID-19 treatment, convalescent plasma (CP) has been used as a possible treatment option early in the pandemic. One of the most significant challenges with CP therapy, however, both when defining its efficacy and implementing its approach clinically, is accurately and efficiently characterizing an otherwise heterogenous therapeutic treatment. Given current limitations, our goal is to leverage a SARS antibody testing platform with a newly developed automated endpoint titer analysis program to rapidly define SARS-CoV-2 antibody levels in CP donors and hospitalized patients. A newly developed antibody detection platform was used to perform a serial dilution enzyme-linked immunosorbent assay (ELISA) for immunoglobulin (Ig)G, IgM, and IgA SARS-CoV-2 antibodies. Data were then analyzed using commercially available software, GraphPad Prism, or a newly developed program developed in Python called TiterScape, to analyze endpoint titers. Endpoint titer calculations and analysis times were then compared between the two analysis approaches. Serial dilution analysis of SARS-CoV-2 antibody levels revealed a high level of heterogeneity between individuals. Commercial platform analysis required significant time for manual data input and extrapolated endpoint titer values when the last serial dilution was above the endpoint cutoff, occasionally producing erroneously high results. By contrast, TiterScape processed 1008 samples for endpoint titer results in roughly 14 minutes compared with the 8 hours required for the commercial software program analysis. Equally important, results generated by TiterScape and Prism were highly similar, with differences averaging 1.26 ± 0.2 percent (mean ± SD). The pandemic has created unprecedented challenges when seeking to accurately test large numbers of individuals for SARS-CoV-2 antibody levels with a rapid turnaround time. ELISA platforms capable of serial dilution analysis coupled with a highly flexible software interface may provide a useful tool when seeking to define endpoint titers in a high-throughput manner. Immunohematology 2021;37:33-43. While a variety of therapeutic options continue to emerge for COVID-19 treatment, convalescent plasma (CP) has been used as a possible treatment option early in the pandemic. One of the most significant challenges with CP therapy, however, both when defining its efficacy and implementing its approach clinically, is accurately and efficiently characterizing an otherwise heterogenous therapeutic treatment. Given current limitations, our goal is to leverage a SARS antibody testing platform with a newly developed automated endpoint titer analysis program to rapidly define SARS-CoV-2 antibody levels in CP donors and hospitalized patients. A newly developed antibody detection platform was used to perform a serial dilution enzyme-linked immunosorbent assay (ELISA) for immunoglobulin (Ig)G, IgM, and IgA SARS-CoV-2 antibodies. Data were then analyzed using commercially available software, GraphPad Prism, or a newly developed program developed in Python called TiterScape, to analyze endpoint titers. Endpoint titer calculations and analysis times were then compared between the two analysis approaches. Serial dilution analysis of SARS-CoV-2 antibody levels revealed a high level of heterogeneity between individuals. Commercial platform analysis required significant time for manual data input and extrapolated endpoint titer values when the last serial dilution was above the endpoint cutoff, occasionally producing erroneously high results. By contrast, TiterScape processed 1008 samples for endpoint titer results in roughly 14 minutes compared with the 8 hours required for the commercial software program analysis. Equally important, results generated by TiterScape and Prism were highly similar, with differences averaging 1.26 ± 0.2 percent (mean ± SD). The pandemic has created unprecedented challenges when seeking to accurately test large numbers of individuals for SARS-CoV-2 antibody levels with a rapid turnaround time. ELISA platforms capable of serial dilution analysis coupled with a highly flexible software interface may provide a useful tool when seeking to define endpoint titers in a high-throughput manner. Immunohematology 2021;37:33–43.
Collapse
Affiliation(s)
- A D Ho
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA , and Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , Boston, MA
| | - H Verkerke
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA , and Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , Boston, MA
| | - J W Allen
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA , and Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , Boston, MA
| | - B J Saeedi
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - D Boyer
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - J Owens
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - S Shin
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - M Horwath
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - K Patel
- Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , Boston, MA
| | - A Paul
- Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , Boston, MA
| | - S-C Wu
- Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , Boston, MA
| | - S Chonat
- Department of Pediatrics, Emory University School of Medicine , Atlanta, GA
| | - P Zerra
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - C Lough
- Lifesouth Blood Donation Services , Gainesville, FL
| | - J D Roback
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - A Neish
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - C D Josephson
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - C M Arthur
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , Atlanta, GA
| | - S R Stowell
- Center for Transfusion Medicine and Cellular Therapies, and Department of Pathology and Laboratory Medicine, Emory University School of Medicine , 201 Dowman Drive, Atlanta, GA 30322 , and Joint Program in Transfusion Medicine, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School , 630E New Research Building, 77 Avenue Louis Pasteur, Boston, MA 02115
| |
Collapse
|
5
|
Allen JWL, Verkerke H, Owens J, Saeedi B, Boyer D, Shin S, Roback JD, Neish AS, Stowell SR. Serum pooling for rapid expansion of anti-SARS-CoV-2 antibody testing capacity. Transfus Clin Biol 2020; 28:51-54. [PMID: 33096207 PMCID: PMC7575425 DOI: 10.1016/j.tracli.2020.10.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 01/04/2023]
Abstract
Objectives Examine possible pooling strategies designed to expand SARS-CoV-2 serological testing capacity. Methods Negative pools were assessed to determine optimal optical density (OD) cutoffs, followed by spiking weak or strong positive samples to assess initial assay performance. Samples were then randomly subjected to pool and individual testing approaches. Results Single positive specimens consistently converted pools of 5, 10, or 20 into positive outcomes. However, weaker IgG-positive samples failed to similarly convert pools of 50 to a positive result. In contrast, a stronger individual positive sample converted all pools tested into positive outcomes. Finally, examination of 150 samples configured into pools of 5, 10, 20 or 50 accurately predicted the presence of positive or negative specimens within each pool. Conclusions These results suggest that pooling strategies may allow expansion of serological testing capacity. While limitations exist, such strategies may aid in large-scale epidemiological screening or identification of optimal convalescent plasma donors.
Collapse
Affiliation(s)
- J W L Allen
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States; Department of Pathology, Joint Program in Transfusion Medicine, Harvard Medical School, Brigham and Women's Hospital, 630D New Research Building, 02115 Boston, MA, United States
| | - H Verkerke
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States; Department of Pathology, Joint Program in Transfusion Medicine, Harvard Medical School, Brigham and Women's Hospital, 630D New Research Building, 02115 Boston, MA, United States
| | - J Owens
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States
| | - B Saeedi
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States
| | - D Boyer
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States
| | - S Shin
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States
| | - J D Roback
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States
| | - A S Neish
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States
| | - S R Stowell
- Department of Laboratory Medicine and Pathology, Center for Transfusion Medicine and Cellular Therapies, Emory University School of Medicine, 201, Dowman Dr, 30322 Atlanta, GA, United States; Department of Pathology, Joint Program in Transfusion Medicine, Harvard Medical School, Brigham and Women's Hospital, 630D New Research Building, 02115 Boston, MA, United States.
| |
Collapse
|
6
|
Giry M, Boyer D, Etienne M, Gueudin M, Carpentier D, Grange S, Girault C, Tamion F, Beduneau G. Impact du diagnostic des pneumopathies aiguës communautaires par PCR multiplex sur la prescription antibiotique en réanimation. Med Mal Infect 2020. [DOI: 10.1016/j.medmal.2020.06.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
7
|
Boyer D, Astier A, Carpentier D, Béduneau G. Comment j’évalue les fonctions des voies aériennes supérieures en périextubation, hors dyspnée laryngée. Méd Intensive Réa 2019. [DOI: 10.3166/rea-2019-0089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
8
|
Boyer D. 432 A Systems Perspective on the Hydrological Aspects of Sustainable Livestock Production. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- D Boyer
- West Virginia University, School of Public Health,Morgantown, WV, United States
| |
Collapse
|
9
|
Boyer D, Morisse-Pradier H, Pramil S, Dominique S, Thiberville L. Place de la ventilation non invasive dans la mucoviscidose : état des lieux des pratiques au centre de ressource et de compétence de Rouen. Rev Mal Respir 2018. [DOI: 10.1016/j.rmr.2017.10.103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
10
|
Soin N, Boyer D, Prashanthi K, Sharma S, Narasimulu AA, Luo J, Shah TH, Siores E, Thundat T. Exclusive self-aligned β-phase PVDF films with abnormal piezoelectric coefficient prepared via phase inversion. Chem Commun (Camb) 2015; 51:8257-60. [PMID: 25874745 DOI: 10.1039/c5cc01688f] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Self-polarised poly(vinylidene fluoride), (PVDF), films were prepared via a facile phase-inversion technique wherein the polymorphism of the films was controlled from exclusive α- (>90%) to β-phase (>98%) by simply varying the quenching temperature from 100 °C to -20 °C, respectively. At low temperatures, the β-phase crystallites were found to be self-aligned, with the PVDF thin films possessing a high piezoelectric coefficient of up to -49.6 pm V(-1). The extraordinarily high β-phase and piezoelectric coefficient of these PVDF films make them suitable for electroactive and energy harvesting applications.
Collapse
Affiliation(s)
- N Soin
- Inst. Renew. Energy & Environ. Technol. Uni. of Bolton, Deane Road, Bolton, BL3 5AB, UK.
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Boyer D, Romo-Cruz JCR. Solvable random-walk model with memory and its relations with Markovian models of anomalous diffusion. Phys Rev E Stat Nonlin Soft Matter Phys 2014; 90:042136. [PMID: 25375467 DOI: 10.1103/physreve.90.042136] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Indexed: 06/04/2023]
Abstract
Motivated by studies on the recurrent properties of animal and human mobility, we introduce a path-dependent random-walk model with long-range memory for which not only the mean-square displacement (MSD) but also the propagator can be obtained exactly in the asymptotic limit. The model consists of a random walker on a lattice, which, at a constant rate, stochastically relocates at a site occupied at some earlier time. This time in the past is chosen randomly according to a memory kernel, whose temporal decay can be varied via an exponent parameter. In the weakly non-Markovian regime, memory reduces the diffusion coefficient from the bare value. When the mean backward jump in time diverges, the diffusion coefficient vanishes and a transition to an anomalous subdiffusive regime occurs. Paradoxically, at the transition, the process is an anticorrelated Lévy flight. Although in the subdiffusive regime the model exhibits some features of the continuous time random walk with infinite mean waiting time, it belongs to another universality class. If memory is very long-ranged, a second transition takes place to a regime characterized by a logarithmic growth of the MSD with time. In this case the process is asymptotically Gaussian and effectively described as a scaled Brownian motion with a diffusion coefficient decaying as 1/t.
Collapse
Affiliation(s)
- D Boyer
- Instituto de Física, Universidad Nacional Autónoma de México, D.F. 04510, México and Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, D.F. 04510, México
| | - J C R Romo-Cruz
- Instituto de Física, Universidad Nacional Autónoma de México, D.F. 04510, México
| |
Collapse
|
12
|
Ramos-Fernandez G, Boyer D. Complex behavior can also emerge from simple linear interactions: comment on Bradbury and Vehrencamp. Behav Ecol 2014. [DOI: 10.1093/beheco/aru092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
13
|
Yousef S, Benden C, Boyer D, Elidemir O, Frischer T, Goldfarb S, Lopez-Mitnik G, Mallory G, Visner G, Westall G, Schecter MG. Lung transplantation in children following bone marrow transplantation: a multi-center experience. Pediatr Transplant 2013; 17:231-6. [PMID: 23217003 DOI: 10.1111/petr.12023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [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: 10/02/2012] [Indexed: 12/19/2022]
Abstract
Allogenic BMT has been successfully performed as a treatment for hematologic diseases with an expected long-term survival. This survival is truncated by respiratory complications including airway obstruction especially BO. Chronic GVHD has been reported to precede almost all cases reported. LTx has become a therapeutic life-saving option for patients with end-stage lung disease that maybe offered for the treatment of GVHD. We report a multi-center experience of pediatric LTx following BMT in 11 patients age- and gender-matched with 11 controls who received LTx for end-stage lung disease secondary to CF. Overall death was 36.4% over a follow-up period of 19 months (range 3-36 months) for the cases and 27.3% for the control group followed for 17 months (range 8-32 months). Median FEV1 one yr post-transplant for the cases was 78% predicted compared with 67.3% predicted for the controls. The median for episodes of infection was comparable at a median of one episode per patient through the entire follow-up period among both groups. Acute rejection episodes were significantly higher in the control group with a median of one episode per patient in the control group compared to none within the cases. Our data suggest that LTx may be a valuable therapeutic option for children with end-stage lung disease post-BMT with comparable survival outcome to that after LTx in children for other indications such as CF. Hospital stay was significantly longer in our case group. Infection rate was comparable between groups albeit type of infection varied. Significantly and of interest is that acute rejection episodes were non-existent in these cases.
Collapse
Affiliation(s)
- S Yousef
- Division of Pediatric Pulmonology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Felizardo M, Girard TA, Morlat T, Fernandes AC, Ramos AR, Marques JG, Kling A, Puibasset J, Auguste M, Boyer D, Cavaillou A, Poupeney J, Sudre C, Miley HS, Payne RF, Carvalho FP, Prudêncio MI, Gouveia A, Marques R. Final analysis and results of the Phase II SIMPLE dark matter search. Phys Rev Lett 2012; 108:201302. [PMID: 23003137 DOI: 10.1103/physrevlett.108.201302] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 03/15/2012] [Indexed: 06/01/2023]
Abstract
We report the final results of the Phase II SIMPLE measurements, comprising two run stages of 15 superheated droplet detectors each, with the second stage including an improved neutron shielding. The analyses include a refined signal analysis, and revised nucleation efficiency based on a reanalysis of previously reported monochromatic neutron irradiations. The combined results yield a contour minimum of σp=5.7×10(-3) pb at 35 GeV/c2 in the spin-dependent sector of weakly interacting massive particle (WIMP) proton interactions, the most restrictive to date for MW}≤60 GeV/c2 from a direct search experiment and overlapping, for the first time, with results previously obtained only indirectly. In the spin-independent sector, a minimum of 4.7×10(-6) pb at 35 GeV/c2 is achieved, with the exclusion contour challenging a significant part of the light mass WIMP region of current interest.
Collapse
Affiliation(s)
- M Felizardo
- Department of Physics, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal and Centro de Física Nuclear, Universidade de Lisboa, 1649-003 Lisbon, Portugal
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Schaellibaum G, Lammers AE, Faro A, Moreno-Galdo A, Parakininkas D, Schecter MG, Solomon M, Boyer D, Conrad C, Frischer T, Wong J, Boehler A, Benden C. Bilateral lung transplantation for pediatric idiopathic pulmonary arterial hypertension: a multi-center experience. Pediatr Pulmonol 2011; 46:1121-7. [PMID: 21634032 DOI: 10.1002/ppul.21484] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [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: 12/30/2010] [Revised: 04/17/2011] [Accepted: 04/17/2011] [Indexed: 11/09/2022]
Abstract
Many children with idiopathic pulmonary arterial hypertension (IPAH) experience disease progression despite advanced medical therapy. In these children, heart-lung or bilateral lung transplantation (BLTx) remain the only therapeutic options when other treatments fail. Data on functional outcome after BLTx in children with IPAH are limited. We report a multi-center experience of BLTx for pediatric IPAH. We performed a retrospective study including 25 centers within the International Pediatric Lung Transplant Collaborative. Children with IPAH who underwent BLTx were included (1996-2006). Twenty-three children underwent BLTx for IPAH, most of whom were in WHO class III or IV level of function pre-transplantation. At 6 months post-transplantation, 82% of children reported improvement in level of function to WHO class I. The median FEV(1) was 89% (12-126) of predicted at 12 months post-transplantation. Ten patients (44%) developed BOS at a median of 42 months (3-85), of whom five died at a median of 27 months (4-86) post-transplantation. Overall mortality was 4% at 3 months post-transplantation. The median survival for children in this cohort was 45 months (2-123). Our data suggest that BLTx is a valuable therapeutic option for children with end-stage IPAH with outcomes comparable to that after heart-lung transplantation in children with pulmonary arterial hypertension or those patients undergoing lung transplantation for other indications. In the majority of children, a good cardiopulmonary function is possible following BLTx, making BLTx a good therapeutic option and maximizing donor organ utilization by allowing more hearts to be available for children needing cardiac transplantation.
Collapse
Affiliation(s)
- G Schaellibaum
- Division of Pulmonary Medicine, University Hospital Zurich, Zurich, Switzerland
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Felizardo M, Morlat T, Fernandes AC, Girard TA, Marques JG, Ramos AR, Auguste M, Boyer D, Cavaillou A, Sudre C, Poupeney J, Payne RF, Miley HS, Puibasset J. First results of the Phase II SIMPLE dark matter search. Phys Rev Lett 2010; 105:211301. [PMID: 21231283 DOI: 10.1103/physrevlett.105.211301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Revised: 10/08/2010] [Indexed: 05/30/2023]
Abstract
We report results of a 14.1 kg d measurement with 15 superheated droplet detectors of total active mass 0.208 kg, comprising the first stage of a 30 kg d Phase II experiment. In combination with the results of the neutron-spin sensitive XENON10 experiment, these results yield a limit of |a(p)|<0.32 for M(W)=50 GeV/c² on the spin-dependent sector of weakly interacting massive particle-nucleus interactions with a 50% reduction in the previously allowed region of the phase space, formerly defined by XENON, KIMS, and PICASSO. In the spin-independent sector, a limit of 2.3×10⁻⁵ pb at M(W)=45 GeV/c² is obtained.
Collapse
Affiliation(s)
- M Felizardo
- Department of Physics, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Yousef S, Benden C, Frischer T, Westall G, Goldfarb S, Ballman M, Aurora P, Doherty G, Boyer D, Visner G. 201: Lung Transplantation in Children after Hematopoietic Stem-Cell Transplantation. J Heart Lung Transplant 2010. [DOI: 10.1016/j.healun.2009.11.212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
|
18
|
Liu M, Worley S, Arrigain S, Aurora P, Ballmann M, Boyer D, Conrad C, Eichler I, Elidemir O, Goldfarb S, Mallory GB, Mogayzel PJ, Parakininkas D, Visner G, Sweet S, Faro A, Michaels M, Danziger-Isakov LA. Respiratory viral infections within one year after pediatric lung transplant. Transpl Infect Dis 2009; 11:304-12. [PMID: 19422670 PMCID: PMC7169860 DOI: 10.1111/j.1399-3062.2009.00397.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [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: 11/30/2022]
Abstract
Abstract: To characterize epidemiology and risk factors for respiratory viral infections (RVI) in pediatric lung transplant recipients within the first post‐transplant year, a retrospective multicenter study of pediatric lung transplant recipients from 1988 to 2005 was conducted at 14 centers in the United States and Europe. Data were recorded for 1 year post transplant. Associations between RVI and continuous and categorical risk factors were assessed using Wilcoxon's rank‐sum and χ2 tests, respectively. Associations between time to RVI and risk factors or survival were assessed by multivariable Cox proportional hazards models. Of 576 subjects, 79 subjects (14%) had 101 RVI in the first year post transplant. Subjects with RVI were younger than those without RVI (median ages 9.7, 13; P<0.01). Viruses detected included adenovirus (n=25), influenza (n=9), respiratory syncytial virus (n=21), parainfluenza virus (n=19), enterovirus (n=4), and rhinovirus (n=22). In a multivariable model for time to first RVI, etiology other than cystic fibrosis (CF), younger age, and no induction therapy were independently associated with risk of RVI. Cytomegalovirus serostatus and acute rejection were not associated with RVI. RVI was independently associated with decreased 12‐month survival (hazard ratio 2.6, 95% confidence interval 1.6–4.4). RVI commonly occurs after pediatric lung transplantation with risk factors including younger age and non‐CF diagnosis. RVI is associated with decreased 1‐year survival.
Collapse
Affiliation(s)
- M Liu
- The Children's Hospital at Cleveland Clinic, Cleveland, Ohio 44195, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Benden C, Faro A, Worley S, Arrigain S, Aurora P, Ballmann M, Boyer D, Conrad C, Eichler I, Elidemir O, Goldfarb S, Mallory G, Mogayzel P, Parakininkas D, Solomon M, Visner G, Sweet S, Danziger-Isakov L. 165: A Single Episode of Minimal Acute Rejection after Lung Transplantation – Does It Matter in Children? J Heart Lung Transplant 2009. [DOI: 10.1016/j.healun.2008.11.172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
20
|
Lepoutre S, Boyer D, Potdevin A, Dubois M, Briois V, Mahiou R. Structural investigations of sol–gel-derived LiYF4 and LiGdF4 powders. J SOLID STATE CHEM 2007. [DOI: 10.1016/j.jssc.2007.09.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
21
|
Gomez-Solano JR, Boyer D. Coarsening in potential and nonpotential models of oblique stripe patterns. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 76:041131. [PMID: 17994960 DOI: 10.1103/physreve.76.041131] [Citation(s) in RCA: 2] [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: 05/16/2007] [Indexed: 05/25/2023]
Abstract
We study the coarsening of two-dimensional oblique stripe patterns by numerically solving potential and nonpotential anisotropic Swift-Hohenberg equations. Close to onset, all models exhibit isotropic coarsening with a single characteristic length scale growing in time as t1/2. Further from onset, the characteristic lengths along the preferred directions x and ŷ grow with different exponents, close to 1/3 and 1/2, respectively. In this regime, one-dimensional dynamical scaling relations hold. We draw an analogy between this problem and model A in a stationary, modulated external field. For deep quenches, nonpotential effects produce a complicated dislocation dynamics that can lead to either arrested or faster-than-power-law growth, depending on the model considered. In the arrested case, small isolated domains shrink down to a finite size and fail to disappear. A comparison with available experimental results for electroconvection in nematics is presented.
Collapse
Affiliation(s)
- J R Gomez-Solano
- Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 México, Distrito Federal, Mexico
| | | |
Collapse
|
22
|
|
23
|
Santos MC, Boyer D, Miramontes O, Viswanathan GM, Raposo EP, Mateos JL, da Luz MGE. Origin of power-law distributions in deterministic walks: the influence of landscape geometry. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 75:061114. [PMID: 17677227 DOI: 10.1103/physreve.75.061114] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Indexed: 05/16/2023]
Abstract
We investigate the properties of a deterministic walk, whose locomotion rule is always to travel to the nearest site. Initially the sites are randomly distributed in a closed rectangular (ALxL) landscape and, once reached, they become unavailable for future visits. As expected, the walker step lengths present characteristic scales in one (L-->0) and two (AL approximately L) dimensions. However, we find scale invariance for an intermediate geometry, when the landscape is a thin striplike region. This result is induced geometrically by a dynamical trapping mechanism, leading to a power-law distribution for the step lengths. The relevance of our findings in broader contexts--of both deterministic and random walks--is also briefly discussed.
Collapse
Affiliation(s)
- M C Santos
- Departamento de Física, Universidade Federal do Paraná, 81531-990 Curitiba--PR, Brazil
| | | | | | | | | | | | | |
Collapse
|
24
|
|
25
|
Cognet L, Tardin C, Boyer D, Choquet D, Tamarat P, Lounis B. Single metallic nanoparticle imaging for protein detection in cells. Proc Natl Acad Sci U S A 2003; 100:11350-5. [PMID: 13679586 PMCID: PMC208760 DOI: 10.1073/pnas.1534635100] [Citation(s) in RCA: 192] [Impact Index Per Article: 9.1] [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: 06/11/2003] [Indexed: 11/18/2022] Open
Abstract
We performed a visualization of membrane proteins labeled with 10-nm gold nanoparticles in cells, using an all-optical method based on photothermal interference contrast. The high sensitivity of the method and the stability of the signals allows 3D imaging of individual nanoparticles without the drawbacks of photobleaching and blinking inherent to fluorescent markers. A simple analytical model is derived to account for the measurements of the signal amplitude and the spatial resolution. The photothermal interference contrast method provides an efficient, reproducible, and promising way to visualize low amounts of proteins in cells by optical means.
Collapse
Affiliation(s)
- L Cognet
- Centre de Physique Moléculaire Optique et Hertzienne, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5798 et Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence, France
| | | | | | | | | | | |
Collapse
|
26
|
Abstract
We study domain coarsening of two-dimensional stripe patterns by numerically solving the Swift-Hohenberg model of Rayleigh-Bénard convection. Near the bifurcation threshold, the evolution of disordered configurations is dominated by grain-boundary motion through a background of largely immobile curved stripes. A numerical study of the distribution of local stripe curvatures, of the structure factor of the order parameter, and a finite size scaling analysis of the grain-boundary perimeter, suggest that the linear scale of the structure grows as a power law of time t(1/z), with z=3. We interpret theoretically the exponent z=3 from the law of grain-boundary motion.
Collapse
Affiliation(s)
- D Boyer
- School of Computational Science and Information Technology, Florida State University, Tallahassee, Florida 32306-4120, USA
| | | |
Collapse
|
27
|
Abstract
We study the motion of a grain boundary that separates two sets of mutually perpendicular rolls in Rayleigh-Bénard convection above onset. The problem is treated either analytically from the corresponding amplitude equations, or numerically by solving the Swift-Hohenberg equation. We find that if the rolls are curved by a slow transversal modulation, a net translation of the boundary follows. We show analytically that although this motion is a nonlinear effect, it occurs in a time scale much shorter than that of the linear relaxation of the curved rolls. The total distance traveled by the boundary scales as epsilon(-1/2), where epsilon is the reduced Rayleigh number. We obtain analytical expressions for the relaxation rate of the modulation and for the time-dependent traveling velocity of the boundary, and especially their dependence on wave number. The results agree well with direct numerical solutions of the Swift-Hohenberg equation. We finally discuss the implications of our results on the coarsening rate of an ensemble of differently oriented domains in which grain-boundary motion through curved rolls is the dominant coarsening mechanism.
Collapse
Affiliation(s)
- D Boyer
- School of Computational Science and Information Technology, Florida State University, Tallahassee, Florida 32306-4120, USA
| | | |
Collapse
|
28
|
Boyer D, Lund F. Ultrasound scattering and the study of vortex correlations in disordered flows. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 2000; 61:1491-1496. [PMID: 11046429 DOI: 10.1103/physreve.61.1491] [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] [Subscribe] [Scholar Register] [Received: 06/30/1999] [Indexed: 05/23/2023]
Abstract
In an idealized way, some turbulent flows can be pictured by assemblies of many vortices characterized by a set of particle distribution functions. Ultrasound provides a useful, nonintrusive, tool to study the spatial structure of vorticity in flows. This is analogous to the use of elastic neutron scattering to determine liquid structure. We express the dispersion relation, as well as the scattering cross section, of sound waves propagating in a "liquid" of identical vortices as a function of vortex pair correlation functions. In two dimensions, formal analogies with ionic liquids are pointed out.
Collapse
Affiliation(s)
- D Boyer
- Departamento de Fisica, Facultad de Ciencias Fisicas y Matematicas, Universidad de Chile, Casilla 487-3, Santiago, Chile
| | | |
Collapse
|
29
|
Boyer D. Critical behavior of vorticity in two-dimensional turbulence. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1999; 60:6769-75. [PMID: 11970596 DOI: 10.1103/physreve.60.6769] [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] [Subscribe] [Scholar Register] [Received: 05/04/1999] [Indexed: 04/18/2023]
Abstract
We point out some similarities between the statistics of high Reynolds number turbulence and critical phenomena. An analogy is developed for two-dimensional decaying flows, in particular by studying the scaling properties of the two-point vorticity correlation function within a simple phenomenological framework. The inverse of the Reynolds number is the analog of the small parameter that separates the system from criticality. It is possible to introduce a set of three critical exponents; for the correlation length, the autocorrelation function, and the so-called susceptibility, respectively. The exponents corresponding to the well-known enstrophy cascade theory of Kraichnan and Batchelor are, remarkably, the same as the Gaussian approximation exponents for spin models. The limitations of the analogy, in particular the lack of universal scaling functions, are also discussed.
Collapse
Affiliation(s)
- D Boyer
- Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 487-3, Santiago, Chile
| |
Collapse
|
30
|
Abstract
We analyzed the ability of the Wisconsin Card Sorting Test to distinguish between 41 malingering and 31 normal undergraduates, and 17 probable malingering and 16 brain injured patients. A logistic regression consisting of number of categories (CAT) and failure to maintain set (FMS) distinguished malingering and normal undergraduates with 70.7% sensitivity, 87.1% specificity, and 77.8% overall classification, and distinguished patients suspected of malingering from brain injured controls with 82.4% sensitivity, 93. 3% specificity, and 87.5% overall classification.
Collapse
Affiliation(s)
- J A Suhr
- Ohio University, Athens, OH, USA.
| | | |
Collapse
|
31
|
|
32
|
Abstract
OBJECTIVES The purpose of this in vitro study was to compare the shear bond strength to enamel and dentine of two resin modified glass ionomers (Fuji Bond L.C. and Vitrebond) and two resin based adhesives (Prime&Bond 2.1 and Scotchbond Multi-Purpose). METHODS A total of 120 bond sites were prepared on either enamel (n = 60) or dentine (n = 60) on human molars by grinding the teeth flat with a 600 grit sandpaper. Each tooth substrate group was divided into four groups (n = 15) to match each material. Each of the four material systems was applied, according to the manufacturers instructions, to the bond sites. On top of the placed material, a microfilled composite was placed in a 2.5 mm diameter matrix and light-cured for 40 s. All specimens were thermocycled 500 times (5-55 degrees C). Shear bond strength values were determined 120 h after bonding using a Zwick testing machine. One-way ANOVA was used to determine whether significant differences (p < 0.05) existed among the material groups on enamel and dentine. Pairwise comparisons were used to determine significant differences (p < 0.05) among the four products. RESULTS The ANOVA revealed strong significant differences on enamel (p = 0.0001) and dentine (p = 0.0172). The enamel bond strength values of the two resin based adhesives were significantly higher than one of the resin modified glass ionomers (Vitrebond), while the other resin modified glass ionomers did not differ from Scotchbond Multi-Purpose. On dentine, however, Vitrebond performed significantly better than the two resin based adhesives. CONCLUSIONS The investigated resin modified glass ionomers bonded better to dentine surfaces than to enamel surfaces, while the investigated resin based adhesive systems bonded better to enamel than to dentine.
Collapse
Affiliation(s)
- V V Gordan
- University of Florida, College of Dentistry, Department of Operative Dentistry, Gainesville 32610-0415, USA.
| | | | | |
Collapse
|
33
|
Benevolenskaia LI, Boyer D, Erdes S, Templin D, Alekseeva LI, Lorence R, Hase S, Goring V. [Comparative study of epidemiology of spondylarthropathies in indigenous population of the Chukot peninsula and Alaska]. TERAPEVT ARKH 1998; 70:41-6. [PMID: 9532651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
UNLABELLED The paper sums up the many-year cooperative Russian-American studies of the epidemiology of spondylarthropathies in the arctic populations of the Chukot Peninsula and Alaska. AIM Comparison of the epidemiology of spondylarthropathies in the indigenous population of the Chukot Peninsula and Alaska. MATERIALS AND METHODS A universal design of investigation with the same diagnostic criteria was used in both countries. A total of 974 indigenous residents of the Chukot Peninsula were examined simultaneously, on the Alaska the sampling was formed as the residents applied for care. RESULTS In both regions the study revealed 1) a high incidence of HLA-B27, reaching 40% in the Chukot Eskimos; 2) a similarly high incidence of spondylarthropathies varying from 2 to 3.4%; 3) a similar spectrum of diseases, including, primarily, ankylosing spondylarthritis and Reiter's syndrome and undifferentiated spondylarthropathies and (rarely) psoriatic arthritis. Among HLA-B27 positive adults, the incidence of spondylarthropathies in all groups is 4.2% and of ankylosing spondylarthritis 1.5%. CONCLUSION A high incidence of spondylarthropathies, varying from 2 to 3.4%, was revealed in the Arctic populations of the Chukot Peninsula and Alaska with a high incidence of HLA-B27 antigen. Although the spectrum of detected diseases was similar in the two groups, ankylosing sponditis was more incident on the Chukot Peninsula, whereas on the Alaska reactive arthritis and nondifferentiated spondylarthropathies predominated, which can be explained by difference in the methods of examination.
Collapse
|
34
|
Affiliation(s)
- O Kahyaoglu
- Department of Pediatrics, Hurley Medical Center, Flint, MI 48503, USA
| | | | | | | |
Collapse
|
35
|
Affiliation(s)
- K Kannenberg
- Department of women's studies, University of Washington, Seattle 98195, USA
| | | |
Collapse
|
36
|
Boyer D, Abdelfattah A. [Designation of symptoms in mental disorder]. Ann Med Psychol (Paris) 1995; 153:467-9; discussion 469-70. [PMID: 8526335] [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: 01/31/2023]
Abstract
In the author's opinion, language and clinical facts in psychiatry are misused and it is hypothesized that many malfunctions of psychiatric practise are symptomatic. It is indeed very hard to modelise mental illness: what terms should be chosen and how should they be articulated? Considering the complexity of the relationship between language, ideas and memory, an empirical and experimental approach has been chosen; working out structures of concepts isomorphic to psychiatric reality, either from observed phenomena or from words. In our view, language skills are sufficient to build these sophisticated models, and language skills can be trained as can be trained sensorimotor skills. Experimenting psychiatric language in using their encyclopedic knowledge will allow staff members to teach themselves and will have a heuristic value in changing their beliefs about reality. These experiments have been undertaken for a year and an half, in a general psychiatry ward, in a ward for retarded and autistic adults and in a rehabilitation ward. Rigour and perseverance are required but these experiments seem particularly promising.
Collapse
Affiliation(s)
- D Boyer
- Centre hospitalier, Prémontré
| | | |
Collapse
|
37
|
|
38
|
Boyer D, Tarjus G, Viot P. Shattering transition in a multivariable fragmentation model. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1995; 51:1043-1046. [PMID: 9962747 DOI: 10.1103/physreve.51.1043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
39
|
Abstract
The literature on blink rate as a measure of fatigue is reviewed. The evidence of increases in blink rate as a function of time on task is compelling. However, variables other than time on task also affect blink rate. These variables range from perceptual demandingness of the task to cognitive variables. Other aspects of blinking, such as flurries of blinks, timing with respect to information-processing demands, and blink closure duration, are reviewed as additional variables sensitive to task demands and fatigue effects.
Collapse
Affiliation(s)
- J A Stern
- Department of Psychology, Washington University, St. Louis, MO 63130
| | | | | |
Collapse
|
40
|
Boyer D, Talbot J, Tarjus G, Viot P. Exactly solvable models of irreversible adsorption with particle spreading. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1994; 49:5525-5534. [PMID: 9961878 DOI: 10.1103/physreve.49.5525] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
41
|
Boyer D, Gordon RC, Baker T. Lack of clinical usefulness of a positive latex agglutination test for Neisseria meningitidis/Escherichia coli antigens in the urine. Pediatr Infect Dis J 1993; 12:779-80. [PMID: 8414808 DOI: 10.1097/00006454-199309000-00017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- D Boyer
- Department of Pediatrics, Hurley Medical Center, Flint, MI
| | | | | |
Collapse
|
42
|
|
43
|
Boyer D, Fine D. Sexual abuse as a factor in adolescent pregnancy and child maltreatment. Fam Plann Perspect 1992; 24:4-11, 19. [PMID: 1601126] [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] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Two-thirds of a sample of 535 young women from the state of Washington who became pregnant as adolescents had been sexually abused: Fifty-five percent had been molested, 42 percent had been victims of attempted rape and 44 percent had been raped. Compared with adolescent women who became pregnant but had not been abused, sexually victimized teenagers began intercourse a year earlier, were more likely to have used drugs and alcohol and were less likely to practice contraception. The abused adolescents were also more likely to have been hit, slapped or beaten by a partner and to have exchanged sex for money, drugs or a place to stay. Young women in the abused group were also more likely to report that their own children had been abused or had been taken from them by Child Protective Services.
Collapse
Affiliation(s)
- D Boyer
- Women's Studies Program, University of Washington, Seattle
| | | |
Collapse
|
44
|
Inoue S, Boyer D, Gordon R. Interstitial pneumonia and alpha-hemolytic Streptococcus sepsis in a child with malignancy who recently received cytosine arabinoside. Pediatr Infect Dis J 1990; 9:598-600. [PMID: 2235181 DOI: 10.1097/00006454-199008000-00019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
45
|
Marois Y, Guidoin R, Boyer D, Assayed F, Doillon CJ, Paynter R, Marois M. In vivo evaluation of hydrophobic and fibrillar microporous polyetherurethane urea graft. Biomaterials 1989; 10:521-31. [PMID: 2605286 DOI: 10.1016/0142-9612(89)90057-4] [Citation(s) in RCA: 19] [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] [Indexed: 01/01/2023]
Abstract
Mitrathane hydrophobic and fibrillar microporous prosthesis was implanted as infrarenal arterial substitute in dogs; it was evaluated in terms of patency rates, healing characteristics and biostability. Segments of grafts were implanted in duplicate for a period of implantation of 24 h, 1 wk, 1 month and 6 month. Two control grafts from the Ontario Research Foundation were implanted: one for 1 month, the other for six month. All except the two Mitrathane grafts implanted for 6 month were patent at death. The Mitrathane grafts showed kinking at one and 6 month post-implantation. The ORF graft implanted for 1 month was found crinkled in its mid-section and the external capsule was ruptured in the graft implanted for 6 month, without crinkling. Histological studies showed fibrin deposits on the flow surface and infiltration of blood elements into the wall of the Mitrathane grafts implanted for 24 h and 1 wk. A thin internal capsule was present on the graft flow surface of both types of graft tested 1 month post-implantation; scanning electron microscopy revealed the presence of endothelial-like cells on the luminal surface, particularly in the vicinity of the anastomoses. At 6 month, the Mitrathane grafts were occluded by a thick thrombus originating from the anastomoses, while the ORF graft showed infiltration of collagen through the polyurethane fibrillar structure of the wall with an endothelial-like lining covering the flow surface in the vicinity of both anastomoses.
Collapse
Affiliation(s)
- Y Marois
- Biomaterials Unit, St-François d'Assise Hospital, Quebec, Canada
| | | | | | | | | | | | | |
Collapse
|
46
|
Marois Y, Boyer D, Guidoin R, Douville Y, Marois M, Teijeira FJ, Roy PE. In vivo evaluation of four chemically processed biological grafts implanted as infrarenal arterial substitutes in dogs. Biomaterials 1989; 10:369-79. [PMID: 2804226 DOI: 10.1016/0142-9612(89)90128-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Four chemically processed grafts implanted as arterial substitutes in dogs were evaluated as blood conduits in terms of patency rates, healing characteristics and biostability. Omniflow, Biopolymeric, Dardik-Biograft of the second generation and BIMA grafts were implanted as infrarenal aortic substitutes for 4, 24 and 48 h (short-term), 1, 2 and 4 wk (medium-term), 3 and 6 month (long-term), each type of graft being implanted for a complete series. The explanted grafts were evaluated macroscopically and processed for light and scanning electron microscopy. One Omniflow graft was occluded at 6 months and two Dardik-Biografts were thrombosed, one at 24 h and one at 1 month. All explanted grafts in the Biopolymeric series and in the BIMA were patent at the animals' death. Histological studies revealed frequent subintimal fibrosis in the Biopolymeric and Omniflow grafts. A peripheral inflammatory reaction was present in most grafts explanted. Scanning electron microscopy showed an aggravation of flow surface irregularities, after implantation of Omniflow, Biopolymeric and Dardik-Biograft, compared to virgin prostheses. These grafts presented an internal capsulae on the graft flow surface along the anastomoses. The capsulae slightly extended towards the centre of the graft after long-term implantation, (6 month) and corresponded to the pannus. Endothelial-like cells covered this pannus. The BIMA graft performed the most satisfactorily and retained its blood compatibility best, that is, the luminal surface was smooth with only minor thrombotic deposits and a thin pannus along the anastomotic lines.
Collapse
Affiliation(s)
- Y Marois
- Laboratory of Experimental Surgery, Laval University, Québec, Canada
| | | | | | | | | | | | | |
Collapse
|
47
|
Teijeira FJ, Marois Y, Aguiar L, Guidoin R, Bauset R, Lamoureux G, Downs A, Marois M, Boyer D. Comparison of processed bovine internal mammary arteries and autologous veins as arterial femoral substitutes in dogs: blood compatibility and pathological characteristics. Can J Surg 1989; 32:180-7. [PMID: 2713772] [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: 01/02/2023] Open
Abstract
This study was undertaken to compare the chemically processed internal mammary artery (BIMA) and the autologous femoral vein as arterial grafts. The BIMA prosthesis was implanted as a left femoral artery bypass and the femoral vein as a right femoral artery bypass graft in 27 dogs. In groups of three dogs the grafts were implanted for predetermined durations: 4, 24 and 48 hours (short term), 1, 2 and 4 weeks (medium term) and 3, 6 and 9 months (long term). All autologous veins were patent when the dogs were killed. The patency rates of the BIMA grafts were 100% in the short-term group, 67% in the medium-term group and 29% in the long-term group. The deposition of labelled fibrinogen and platelets on flow surfaces, the structural preservation of the wall of the BIMA prosthesis and accumulation of thrombi during the period of implantation were studied.
Collapse
Affiliation(s)
- F J Teijeira
- Service of Cardiovascular Surgery, Université de Sherbrooke, PQ
| | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Rao NA, Zimmerman PL, Boyer D, Biswas J, Causey D, Beniz J, Nichols PW. A clinical, histopathologic, and electron microscopic study of Pneumocystis carinii choroiditis. Am J Ophthalmol 1989; 107:218-28. [PMID: 2784287 DOI: 10.1016/0002-9394(89)90303-6] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We studied the clinical and histopathologic features of Pneumocystis carinii choroiditis in three patients with acquired immunodeficiency syndrome. In two cases, a provisional diagnosis of disseminated P. carinii infection was made by ophthalmologic examination. The characteristic fundus changes in this infection consisted of numerous slightly elevated, plaque-like, yellow-white lesions located in the choroid and unassociated with signs of intraocular inflammation. The diagnosis was confirmed by postmortem examination of the eyes and other organs. Histopathologically, the globes showed many choroidal infiltrates that were eosinophilic, acellular, vacuolated, and frothy. Several such infiltrates were noted within the choroidal vessels and choriocapillaries. Gomori's methenamine silver stain demonstrated many cystic and crescentic organisms. Electron microscopy disclosed thick-walled cystic organisms and large numbers of trophozoites.
Collapse
Affiliation(s)
- N A Rao
- Estell Doheny Eye Institute, Los Angeles CA 90033
| | | | | | | | | | | | | |
Collapse
|
49
|
Torché D, Guidoin R, Boyer D, Marceau D, Marois Y, Debille E, Lacombe J, King M. An arterial prosthesis from Argentina: the Barone Microvelour arterial graft. J Biomater Appl 1989; 3:427-53. [PMID: 2715920 DOI: 10.1177/088532828800300302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The manufacture of a polyester vascular prosthesis in the southern hemisphere is a new development in the global dissemination of this maturing technology. Hence the recent introduction of the Barone Microvelour arterial graft from Argentina has highlighted the need for a comparative in vitro and in vivo study to compare its structure and performance with that of existing commercial products. Following a series of laboratory tests and implantations as a thoracoabdominal bypass in dogs, the Barone Microvelour has been identified as a strong graft constructed after the style of early weft-knitted designs. It provides an equivalent sequence and rate of healing to that of other polyester knitted grafts.
Collapse
Affiliation(s)
- D Torché
- Laboratory of Experimental Surgery, Laval University Québec, QC, Canada
| | | | | | | | | | | | | | | |
Collapse
|
50
|
White CM, Gere DR, Boyer D, Pacholec F, Wong LK. Analysis of pharmaceuticals and other solutes of biochemical importance by supercritical fluid chromatography. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/jhrc.1240110124] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|