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Cox A, Stevens M, Kallon D, Gupta A, White E. Comparative evaluation of Luminex based assays for detection of SARS-CoV-2 antibodies in a transplantation laboratory. J Immunol Methods 2023; 517:113472. [PMID: 37059296 PMCID: PMC10091782 DOI: 10.1016/j.jim.2023.113472] [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] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 03/31/2023] [Accepted: 04/11/2023] [Indexed: 04/16/2023]
Abstract
BACKGROUND Detection of SARS-CoV-2 antibodies is essential in establishing the parameters of an individual's immune response to COVID-19, from both natural infection and vaccination. Despite this, there is currently limited clinical guidance or recommendations for serological methods for their measurement. Here, we evaluate and compare four Luminex-based assays for the multiplex detection of IgG SARS-CoV-2 antibodies. METHODS The four assays tested were Magnetic Luminex Assay, MULTICOV-AB Assay, Luminex xMAP SARS-CoV-2 Multi-Antigen IgG Assay and LABScreen COVID Plus Assay. Each assay's ability to detect antibodies to SARS-CoV-2 Spike (S), Nucleocapsid (N) and Spike-Receptor Binding Domain (RBD) was evaluated using 50 test samples (25 positive, 25 negative), previously tested by a widely used ELISA technique. RESULTS The MULTICOV-AB Assay had the highest clinical performance detecting antibodies to S trimer and RBD in 100% (n = 25) of known positive samples. Both the Magnetic Luminex Assay and LABScreen COVID Plus Assay showed significant diagnostic accuracy with sensitivities of 90% and 88% respectively. The Luminex xMAP SARS-CoV-2 Multi-Antigen IgG Assay demonstrated limited detection of antibodies to the S antigen resulting in a sensitivity of 68%. CONCLUSION Luminex-based assays provide a suitable serological method for multiplex detection of SARS-CoV-2 specific antibodies, with each assay able to detect antibodies to a minimum of 3 different SARS-CoV-2 antigens. Assay comparison identified there is moderate performance variability between manufacturers and further inter-assay variation of antibodies detected to different SARS-CoV-2 antigens.
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Affiliation(s)
- A Cox
- Clinical Transplantation Laboratory, 3rd Floor Pathology & Pharmacy Building, 80 Newark Street, London E1 2ES, United Kingdom; The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
| | - M Stevens
- Immunology Laboratory, Royal Sussex County Hospital Barry, Eastern Rd, Brighton BN2 5BE, United Kingdom
| | - D Kallon
- Clinical Transplantation Laboratory, 3rd Floor Pathology & Pharmacy Building, 80 Newark Street, London E1 2ES, United Kingdom
| | - A Gupta
- Clinical Transplantation Laboratory, 3rd Floor Pathology & Pharmacy Building, 80 Newark Street, London E1 2ES, United Kingdom
| | - E White
- Clinical Transplantation Laboratory, 3rd Floor Pathology & Pharmacy Building, 80 Newark Street, London E1 2ES, United Kingdom
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van Kesteren Z, Veldman J, Parkes M, Tienhoven G, van den Aardweg J, Stevens M, Bel A, van Dijk I. PD-0233 Breathing amplitude is reduced by rapid shallow breathing at 60 breaths/minute. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02788-8] [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: 10/18/2022]
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Parkes M, Van Dijk I, Veldman J, Van Kesteren Z, Stevens M, Van Tienhoven G, Van Den Aardweg J, Green S, Clutton-Brock T, Bel A. PO-1072 Mechanical re-inflation to maintain chest inflation during prolonged breath-holds for radiotherapy. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03036-5] [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: 11/16/2022]
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Veldman J, van Kesteren Z, Gunwhy E, Parkes M, Stevens M, van den Aardweg J, van Tienhoven G, Bel A, van Dijk I. PD-0229 3D abdominal organ motion correlates strongly with the diaphragm during prolonged breath-holds. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02784-0] [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: 11/29/2022]
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Vantomme E, Sulymka B, Stevens M, Duerksen D. A252 DO GLIM CRITERIA FOR DIAGNOSING MALNUTRITION AGREE WITH SGA IN HOSPITALIZED PATIENTS RECEIVING TPN? J Can Assoc Gastroenterol 2022. [PMCID: PMC8859297 DOI: 10.1093/jcag/gwab049.251] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Background The Global Leadership Initiative on Malnutrition (GLIM) proposed a new two-step model for diagnosing malnutrition in 2019. A combination of two etiologic and three phenotypic criteria are used to assess malnutrition. The Subjective Global Assessment (SGA) is the most well validated assessment tool for diagnosing malnutrition in hospitalized patients. Evaluation of the performance of GLIM criteria in comparison to SGA is necessary before implementing this new diagnostic tool in practice. Aims To compare GLIM criteria to SGA in assessing malnutrition severity in hospitalized patients requiring parenteral nutrition (PN). Methods This is a retrospective analysis of a prospectively collected database of malnourished hospitalized adult patients requiring PN admitted between March 2020 and March 2021 to an academic hospital in Winnipeg, Canada. 172 cases were evaluated. GLIM malnutrition screening was considered positive if one etiologic (high CRP or low food intake) and one phenotypic (weight loss or low BMI) criteria were identified. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were calculated and expressed with a Wilson 95% confidence interval. Results The prevalence of malnutrition using SGA B or C criteria was 82.3% (CI 73.8, 85.5). Using GLIM criteria, the prevalence of malnutrition was 33.7% (27.1, 41.1). The prevalence of severe malnutrition using SGA C was 32.6% (26.0, 40.0) and using GLIM criteria the prevalence was 19.2% (14.0, 25.7). Using any combination of GLIM criteria versus SGA B or C combined, the PPV was 100% (90.4, 100) and the specificity was 100% (89.9, 100); NPV was 30.0% (22.0, 38.5) and the sensitivity was 42.0% (34.1, 50.4). Using any combination of GLIM criteria versus only SGA C patients, PPV decreased to 72.4% (59.8, 82.3) and specificity was 86.2% (78.8, 91.3); NPV increased to 87.7% (80.4, 92.5) and sensitivity was 75.0% (62.3, 84.5). Comparing severely malnourished patients by GLIM criteria to only SGA C patients, PPV was 97% (84.7, 99.5) and specificity was 99.1% (95.3, 100). NPV was 82.7% (75.6, 88.1) and sensitivity was 57.1% (44.1, 69.2). Conclusions Using SGA as the gold standard for diagnosing malnutrition in hospitalized patients requiring PN, GLIM criteria had a very high PPV but unacceptably low NPV in diagnosing malnutrition. The NPV improved when GLIM criteria was compared only to severely malnourished patients by SGA. Importantly, in comparing severely malnourished patients by GLIM and SGA criteria, the sensitivity was also unacceptably low. Based on these results, GLIM criteria are most useful in confirming the diagnosis of malnutrition or severe malnutrition; a negative result should not reassure clinicians that severe malnutrition is absent. Further studies evaluating GLIM criteria are needed before it replaces SGA as a decision making tool. Funding Agencies None
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Affiliation(s)
- E Vantomme
- University of Manitoba, Winnipeg, MB, Canada
| | - B Sulymka
- University of Manitoba, Winnipeg, MB, Canada
| | - M Stevens
- University of Manitoba, Winnipeg, MB, Canada
| | - D Duerksen
- University of Manitoba, Winnipeg, MB, Canada
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Kleemann S, Sandow D, Stevens M, Schultz DJ, Taggart DA, Croxford A. Non-invasive monitoring and reintroduction biology of the brush-tailed rock-wallaby (. AUST J ZOOL 2022. [DOI: 10.1071/zo21009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Thirty-nine endangered brush-tailed rock-wallabies (Petrogale penicillata) were reintroduced to Grampians National Park, western Victoria, between 2008 and 2012. Subsequent high mortality, low breeding, and no recruitment were linked to fox predation and physical disturbance during monitoring. From 2014 to 2017, the colony was left undisturbed and monitored only by remote camera. Five adult animals were identified across this period (1 ♂ and 3 ♀s – all tagged; and one untagged female), and an average of 0.7 pouch young were birthed per tagged female per year. In 2019, camera-monitoring and non-invasive genetic monitoring (faecal) were used to identify colony members, genetic diversity, and breeding. Camera monitoring in 2019 identified the same five individuals, whereas genetic monitoring using 12 microsatellites identified eight individuals (two male and six female genotypes). Genetic diversity within the colony was moderate (expected heterozygosity (He) = 0.655, observed heterozygosity (Ho) = 0.854). Leaving the colony undisturbed after 2013 correlated with improved adult survival, increased breeding, and successful recruitment of young to the population. Recommendations for the Grampians colony include continuation of regular camera- and scat monitoring to improve our understanding of the reintroduction biology of P. penicillata and other marsupials in open, unfenced landscapes.
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Blikman T, Rienstra W, van Raaij TM, ten Hagen AJ, Dijkstra B, Zijlstra WP, Bulstra SK, Stevens M, van den Akker-Scheek I. Duloxetine in OsteoArthritis (DOA) study: effects of duloxetine on pain and function in end-stage hip and knee OA – a pragmatic enriched randomized controlled trial. BMC Musculoskelet Disord 2022; 23:115. [PMID: 35123461 PMCID: PMC8818142 DOI: 10.1186/s12891-022-05034-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 01/10/2022] [Indexed: 12/27/2022] Open
Abstract
Background Some osteoarthritis (OA) patients experience inadequate pain relief from analgesics like acetaminophen and nonsteroidal anti-inflammatory drugs. This could be the result of experienced non-nociceptive centralized pain. Placebo-controlled randomized trials (RCT) have proven the effectiveness of duloxetine for OA and several chronic pain conditions where central sensitization (CS) is one of the key underlying pain mechanisms. Objectives Assess the efficacy of an 8-week duloxetine treatment compared to usual care in end-stage knee and hip OA patients with a level of centralized pain. Design Pragmatic, enriched, open-label RCT. Methods Patients were randomized to duloxetine or to care-as-usual. Primary outcome was pain in the index joint, measured with the pain domain of the Knee injury and Osteoarthritis Outcome Score (KOOS) or the Hip disability and Osteoarthritis Outcome Score (HOOS). The intention-to-treat principle was used, with mixed-model repeated measures to analyze the effect. Results One hundred eleven patients were randomized. Nearly 44% felt much to very much better after duloxetine usage compared to 0% in the care-as-usual group (p < 0.001). The duloxetine group scored 11.3 points (95%CI: 5.8, 16.8) better on the pain domain of the KOOS/HOOS (p < 0.001). Knee patients improved significantly more than hip patients (18.7 [95%CI: 11.3, 26.1] versus 6.0 [95%CI: − 2.6, 14.5] points better). Conclusions Adding duloxetine treatment seems to be beneficial for end-stage knee OA patients with neuropathic-like symptoms (at risk of CS). End stage Hip OA patients seem to be nonresponsive to duloxetine. Trial registration Dutch Trial Registry with number NTR 4744 (15/08/2014) and in the EudraCT database with number 2013–004313-41. Supplementary Information The online version contains supplementary material available at 10.1186/s12891-022-05034-0.
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Barua S, Lo P, Stevens M, Vazquez G, Diab S, Heuring J, Krisher J, Muthiah K, Hayward C. A Mock Circulatory Loop Analysis of an Intra-Aortic Cardiorenal Pump. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.053] [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: 11/17/2022]
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Kasper JC, Klein KG, Lichko E, Huang J, Chen CHK, Badman ST, Bonnell J, Whittlesey PL, Livi R, Larson D, Pulupa M, Rahmati A, Stansby D, Korreck KE, Stevens M, Case AW, Bale SD, Maksimovic M, Moncuquet M, Goetz K, Halekas JS, Malaspina D, Raouafi NE, Szabo A, MacDowall R, Velli M, Dudok de Wit T, Zank GP. Parker Solar Probe Enters the Magnetically Dominated Solar Corona. Phys Rev Lett 2021; 127:255101. [PMID: 35029449 DOI: 10.1103/physrevlett.127.255101] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 11/09/2021] [Accepted: 11/15/2021] [Indexed: 06/14/2023]
Abstract
The high temperatures and strong magnetic fields of the solar corona form streams of solar wind that expand through the Solar System into interstellar space. At 09:33 UT on 28 April 2021 Parker Solar Probe entered the magnetized atmosphere of the Sun 13 million km above the photosphere, crossing below the Alfvén critical surface for five hours into plasma in casual contact with the Sun with an Alfvén Mach number of 0.79 and magnetic pressure dominating both ion and electron pressure. The spectrum of turbulence below the Alfvén critical surface is reported. Magnetic mapping suggests the region was a steady flow emerging on rapidly expanding coronal magnetic field lines lying above a pseudostreamer. The sub-Alfvénic nature of the flow may be due to suppressed magnetic reconnection at the base of the pseudostreamer, as evidenced by unusually low densities in this region and the magnetic mapping.
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Affiliation(s)
- J C Kasper
- BWX Technologies, Inc., Washington, DC 20001, USA and Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K G Klein
- Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85719, USA
| | - E Lichko
- Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85719, USA
| | - Jia Huang
- Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - C H K Chen
- Department of Physics and Astronomy, Queen Mary University of London, London E1 4NS, United Kingdom
| | - S T Badman
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - J Bonnell
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - P L Whittlesey
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - R Livi
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - D Larson
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - M Pulupa
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - A Rahmati
- Space Sciences Laboratory at University of California, Berkeley, California, USA
| | - D Stansby
- Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Surrey RH5 6NT, United Kingdom
| | - K E Korreck
- Smithsonian Astrophysical Observatory, Cambridge, Massachusetts 02138, USA
| | - M Stevens
- Smithsonian Astrophysical Observatory, Cambridge, Massachusetts 02138, USA
| | - A W Case
- Smithsonian Astrophysical Observatory, Cambridge, Massachusetts 02138, USA
| | - S D Bale
- Physics Department, University of California, Berkeley, California 94720-7300, USA and Space Sciences Laboratory at University of California, Berkeley, California 94720-7300, USA
| | - M Maksimovic
- LESIA, Observatoire de Paris, Universite PSL, CNRS, Sorbonne Universite, Universite de Paris, 5 place Jules Janssen, 92195 Meudon, France
| | - M Moncuquet
- LESIA, Observatoire de Paris, Universite PSL, CNRS, Sorbonne Universite, Universite de Paris, 5 place Jules Janssen, 92195 Meudon, France
| | - K Goetz
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - J S Halekas
- Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
| | - D Malaspina
- Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, Colorado 80303, USA
| | - Nour E Raouafi
- The Johns Hopkins Applied Physics Laboratory, Laurel, Maryland 20723, USA
| | - A Szabo
- Heliospheric Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771, USA
| | - R MacDowall
- Heliospheric Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771, USA
| | - Marco Velli
- Earth Planetary and Space Sciences, UCLA, California 90095, USA
| | | | - G P Zank
- Department of Space Science and Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, Alabama 35805, USA
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Shen C, Gharleghi R, Li DD, Stevens M, Dokos S, Beier S. Secondary flow in bifurcations - Important effects of curvature, bifurcation angle and stents. J Biomech 2021; 129:110755. [PMID: 34601214 DOI: 10.1016/j.jbiomech.2021.110755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 09/01/2021] [Accepted: 09/16/2021] [Indexed: 12/27/2022]
Abstract
Coronary bifurcations have complex flow patterns including secondary flow zones and helical flow, which directly affect pathophysiological mechanisms such as the development of atherosclerosis. The objective of this study was to generate insights into the effects of curvature, bifurcation angle and the presence of stents on flow patterns and resulting haemodynamics in coronary left main bifurcations. The blood flow and associated metrics were modelled in both idealised and patient-specific bifurcations with varying curvature and bifurcation angles with and without stents, resulting in a total of 128 geometries considered. The results showed that larger curvature of bifurcating vessels has a significant influence on secondary flow, especially with distance to the bifurcation region, causing a skew, spin and asymmetry of Dean vortices, an increase in helical flow intensity with symmetry loss, and a decrease in adversely low time-average wall shear stress (TAWSS). Generally, asymmetric flow patterns coincided with adversely low TAWSS regions. In identical stented geometries, the presence of the stents induced local recirculation immediately adjacent to the stent struts, thus generating adversely low TAWSS in these areas, with some effect on the overall secondary flow. Overall, the effect of stents outweighed the effect of curvature and BA. This new knowledge contributes to a better understanding of the joint effects of curvature, bifurcation angle, and stents on flow patterns and haemodynamics in coronary bifurcations.
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Affiliation(s)
- C Shen
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney NSW 2052, Australia.
| | - R Gharleghi
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney NSW 2052, Australia
| | - D D Li
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney NSW 2052, Australia
| | - M Stevens
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney NSW 2052, Australia
| | - S Dokos
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney NSW 2052, Australia
| | - S Beier
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney NSW 2052, Australia
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Bevilacqua G, D'Angelo S, Ntani G, Stevens M, Linaker CH, Walker-Bone K. Shift work amongst older UK workers and job exit. Occup Med (Lond) 2021; 71:429-438. [PMID: 34693446 DOI: 10.1093/occmed/kqab131] [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] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Night/shift work may be increasing but there are few data about the prevalence amongst older workers. With governments encouraging people to work to older ages, it is important to know how feasible night/shift work is for them and whether there are any adverse health consequences. AIMS Amongst current older workers (aged 50-64 years), to explore the prevalence of night/shift working and evaluate its health impacts and sustainability over 4 years of follow-up. METHODS Data from the Health and Employment After Fifty cohort were used to describe the demographic, job and health characteristics of men and women undertaking night/shift work. Longitudinal data were used to examine the number and nature of exits annually thereafter. RESULTS Amongst the 5409 working at baseline, 32% reported night/shift work in sectors which differed by sex. Night/shift workers were more likely to be: current smokers; doing physically demanding work; struggling to cope at work; dissatisfied with their hours; depressed; sleeping poorly; rating their health poorly. Women whose job involves night work were more likely to exit the workforce over 4 years. CONCLUSIONS Almost one in three contemporary UK older workers report night/shift work. We found some evidence of adverse impacts on health, sleep and well-being and higher rates of job exit amongst women. More research is needed but night/shift work may be challenging to sustain for older workers and could have health consequences.
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Affiliation(s)
- G Bevilacqua
- MRC Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton SO16 6YD, UK.,MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton SO16 6YD, UK
| | - S D'Angelo
- MRC Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton SO16 6YD, UK.,MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton SO16 6YD, UK
| | - G Ntani
- MRC Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton SO16 6YD, UK.,MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton SO16 6YD, UK
| | - M Stevens
- MRC Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton SO16 6YD, UK.,MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton SO16 6YD, UK
| | - C H Linaker
- MRC Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton SO16 6YD, UK.,MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton SO16 6YD, UK
| | - K Walker-Bone
- MRC Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton SO16 6YD, UK.,MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton SO16 6YD, UK
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Hylkema TH, Stevens M, van Beveren J, Rijk PC, Brouwer RW, Bulstra SK, Kuijer PPFM, Brouwer S. Recovery Courses of Patients Who Return to Work by 3, 6 or 12 Months After Total Knee Arthroplasty. J Occup Rehabil 2021; 31:627-637. [PMID: 33515342 PMCID: PMC8298243 DOI: 10.1007/s10926-021-09959-6] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/08/2021] [Indexed: 05/26/2023]
Abstract
Purpose This study compared the preoperative levels and postoperative recovery courses of physical and mental impairments, activity limitations and participation restrictions of working-age patients who return to work (RTW) by 3, 6 or 12 months after total knee arthroplasty (TKA). Methods A prospective survey study including TKA patients (aged < 65) (n = 146) who returned to work (RdTW) in the first postoperative year. Three groups were compared: those who returned by 3 (n = 35), 6 (n = 40) or 12 (n = 29) months. Surveys were completed preoperatively and at 6 weeks and 3, 6 and 12 months postoperatively. Outcomes represented domains of the International Classification of Functioning, i.e. physical impairments (pain, stiffness, vitality), mental impairments (mental health and depressive symptoms), activity limitations (physical functioning) and participation restrictions (social and work functioning). Results Preoperative knee-specific pain and physical functioning levels were better among patients who RdTW by 3 months, compared to those who returned by 12 months. Patients who RdTW by 3 months experienced significantly better recovery from physical impairments than those who returned by 6 months (on general pain) or 12 months (on general and knee-specific pain and on stiffness). Patients returning by 3 months experienced significantly better recovery from activity limitations (on knee-specific physical functioning). Conclusions To optimize return to work outcome after TKA surgery, the focus should lie on physical impairments (general and knee-specific pain, stiffness) and activity limitations (knee-specific physical functioning) during recovery.
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Affiliation(s)
- T H Hylkema
- Department of Orthopedics, University Medical Center Groningen, University of Groningen, PO Box 30.001, 9700 RB, Groningen, The Netherlands.
- Department of Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
| | - M Stevens
- Department of Orthopedics, University Medical Center Groningen, University of Groningen, PO Box 30.001, 9700 RB, Groningen, The Netherlands
| | - J van Beveren
- Department of Orthopedics, Röpcke-Zweers Hospital Hardenberg, Hardenberg, The Netherlands
| | - P C Rijk
- Department of Orthopedics, Medical Center Leeuwarden, Leeuwarden, The Netherlands
| | - R W Brouwer
- Department of Orthopedics, Martini Hospital Groningen, Groningen, The Netherlands
| | - S K Bulstra
- Department of Orthopedics, University Medical Center Groningen, University of Groningen, PO Box 30.001, 9700 RB, Groningen, The Netherlands
| | - P P F M Kuijer
- Coronel Institute of Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands
| | - S Brouwer
- Department of Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Hylkema TH, Brouwer S, Kooijman CM, De Vries AJ, Breukelman F, Dekker H, Almansa J, Kuijer PPFM, Bulstra SK, Stevens M. Accelerometer Measured Sedentary and Physical Activity Behaviors of Working Patients after Total Knee Arthroplasty, and their Compensation Between Occupational and Leisure Time. J Occup Rehabil 2021; 31:350-359. [PMID: 32946009 PMCID: PMC8172507 DOI: 10.1007/s10926-020-09924-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Purpose Objective measurements of sedentary and physical activity (PA) behavior are scarce among working-age patients who undergo total knee arthroplasty (TKA). Aim was to assess sedentary and PA behaviors using accelerometers and to identify compensation effects between occupational and leisure time of sedentary and PA behavior. Methods One year post-TKA, 51 patients wore an ActiGraph(GT3x) accelerometer for 7 days. Sedentary time, prolonged sedentary bouts (≥ 30 min) and PA (light-intensity and moderate-to-vigorous PA) were examined. Compliance with the guideline of > 150 min moderate-to-vigorous PA per week was calculated. Compensation effects were analyzed using multilevel models, splitting effects into routine and within-day compensation, stratifying by physical and non-physical jobs. The routine compensation effects are the ones of interest, representing habitual compensation during a week. Results Participants spent 60% of time in sedentary bouts and 17% in prolonged sedentary bouts, with 37% of PA spent in light-intensity and 3% in moderate-to-vigorous activity. About 70% of patients met the PA guideline. Routine compensation effects were found for workers in physical jobs, who compensated for their occupational light-intensity PA with less light-intensity PA during leisure time. Workers in non-physical jobs did not compensate for their occupational prolonged sedentary bouts, as these continued during leisure time. Conclusion This study showed that working TKA patients are highly sedentary 1 year after surgery, but most met the PA guideline. Especially those with non-physical jobs do not compensate for their occupational prolonged sedentary bouts. This stresses the need to stimulate PA among TKA patients not complying with the guidelines and those with non-physical jobs.
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Affiliation(s)
- T H Hylkema
- Department of Orthopedics, University Medical Center Groningen, University of Groningen, PO Box 30.001, 9700 RB, Groningen, The Netherlands.
- Department of Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
| | - S Brouwer
- Department of Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - C M Kooijman
- Department of Orthopedics, Nij Smellinghe Hospital, Drachten, The Netherlands
| | - A J De Vries
- Department of Orthopedics, Martini Hospital Groningen, Groningen, The Netherlands
| | - F Breukelman
- Department of Orthopedics, Wilhelmina Hospital Assen, Assen, The Netherlands
| | - H Dekker
- Department of Orthopedics, Ommelander Ziekenhuishuisgroep Delfzijl, Delfzijl, The Netherlands
| | - J Almansa
- Department of Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - P P F M Kuijer
- Coronel Institute of Occupational Health, Amsterdam Public Health Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - S K Bulstra
- Department of Orthopedics, University Medical Center Groningen, University of Groningen, PO Box 30.001, 9700 RB, Groningen, The Netherlands
| | - M Stevens
- Department of Orthopedics, University Medical Center Groningen, University of Groningen, PO Box 30.001, 9700 RB, Groningen, The Netherlands
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Fetanat M, Stevens M, Hayward C, Lovell N. Aortic Valve Status Detection for Heart Failure Patient with LVAD Using Deep Neural Networks. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.522] [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
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Emmanuel S, Stevens M, Vazquez G, Fetanat M, Abed A, Lovell N, Hayward C. Using the Sinoatrial Node to Induce Pulsatility in Mechanical Circulatory Support Devices. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.544] [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
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Legerer C, Stevens M, Vazquez GM, Müller T, Ferrington L. An experimental evaluation of a concept to improve conventional aortic prostheses. J Biomech 2020; 112:110010. [PMID: 32977296 DOI: 10.1016/j.jbiomech.2020.110010] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 07/31/2020] [Accepted: 08/18/2020] [Indexed: 11/18/2022]
Abstract
Conventionally used textile prosthesis for traditional open surgical repair (OSR) of aortic aneurysms have a lower compliance than the native aortic tissue. Graft placements lead to an acute drop in compliance which effects cardiovascular risk and the development of graft related complications. A custom-made spring casing was applied to a Dacron graft segment under physiological pressure conditions within a five-element biventricular mock circulation loop, to investigate experimentally a concept to improve the compliance of a conventional aortic prosthesis by changing the transverse graft cross-section. Two different prosthesis locations, proximal and distal of compliant silicone tubing were used to study uniaxial graft compression with an elastic device. To characterise the devices' performance by means of pulse pressure (PP), diastolic pressure (Pdia) and pulse wave velocity(PWV), fluid pressures and flow were recorded. In a proximal graft setting (ascending aorta repair) elastic uniaxial compression with a custom-made spring casing (2 cm width) could significantly reduce PP by 10-14% (p < .001) and slowed PWV from 6.7 to 5.2 m/s (22%, p = .002). Applied to a graft in a distal position, the spring casing demonstrated less impact on PP (2-10%), but significantly reduced PWV in this mock aorta segment from 13.7 to 5.5 m/s (60%, p = .004). In conclusion, a newly conceptualised spring casing applied to the external wall of synthetic aortic grafts can reduce PP and slow PWV. By restoring elastic aortic recoil in stiff textile aortic prostheses, the presented concept is a potential solution to improve long-term aortic prosthesis related complications.
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Affiliation(s)
- C Legerer
- Rural Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia.
| | - M Stevens
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - G M Vazquez
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - T Müller
- Medical University of Graz, 8036 Graz, Austria
| | - L Ferrington
- Rural Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia
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Ball J, Radunovic A, Scott C, Stevens M. AB1078 USE OF MYOSITIS SPECIFIC AUTOANTIBODIES TEST ACROSS A LARGE NHS HOSPITAL TRUST. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.4630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:The immunology laboratory at Barts Health supports a large clinical myopathy service, providing blood tests for myositis-specific autoantibodies (MSA) by a commercial line immunoblot panel for Jo1, PL7, PL12, SRP, Mi2, Ku, PM-Scl and Scl-70.As Idiopathic Inflammatory Myositis (IIM) disease subtype definitions have evolved from the 1975 Bohan & Peter criteria, the discovery of new antibodies has proven useful in the hands of neuromuscular clinicians whose patients have a high pre-test probability of disease. Ready availability of the test has led to increased demand from:Respiratory physicians with patients with severe Interstitial Lung Disease (ILD) whichcanbe a symptom of some IIMs.The connective tissue disease (CTD) screening section of the laboratory in which many patients are screened for antinuclear antibodies (ANA), which occasionally produces a pattern thatmaybe associated with an MSA.Objectives:Determine the frequency of MSA requests from different departments.To investigate the possibility of rejecting requests for MSAs at the laboratory in the absence of an elevated creatine kinase (CK), a hallmark of muscle damage associated with myositis (1).Methods:MSA were measured by a commercial line blot (Bluediver) which included Jo-1, PL-7, PL-12, Mi-2, Ku, SRP-54 and PM-Scl-100. Demographics and results for all MSA requested between September 2017 and November 2019 were pulled from laboratory records, together with CK results (if performed). CK was interpreted as low, normal or elevated according to reference ranges of 25-200 U/L (female) or 40-320 U/L (male).Results:597 tests were performed between 2017 and 2019. In total 59/597 (10%) were positive for the audited antibodies (Table 1). General Practitioner (GP) requests accounted for 41/597 (6.9%) tests, internal 464/597 (78%) and external 82/597 (14%). External requests were the most frequently positive at 10/82 (12%), internal requests 46/464 (10%), and GP requests only 3/41 (7%) of the time. Of all internal requesting sources, Respiratory accounted for the largest number at 108/597 (18%), followed by neurology with 85/597 (14%) (Figure 1). GPs constituted the 4thlargest source of requests.Table 1.Positive on polymyositis screen% positivityAll tests597Total599.9%Jo-140.7%PL-720.3%PL-1250.8%SRP-54101.7%Mi-240.7%Ku30.5%PM-Scl 100254.2%Scl-7071.2%Figure 1.MSAs had an associated CK result in 75% of internal and 12% of GP requests. A cohort of 17 patients had positive MSAs (3 x SRP, 1 x PL-7, 1 x Jo-1, 2 x Mi-2, 1 x Ku, 8 x PM-Scl100 and 1 x Scl-70) with normal CK.Of the 41 GP requests, MSA had been requested by the lab on the basis of ANA pattern for 33 (80%) of them, 3 of which were positive (2 x Scl-70, 1 x SRP-54).Conclusion:Demand for MSA from the Respiratory department (screening for ILD) currently exceeds demand from Neurology and from Rheumatology. In the GP cohort, 33 requests (80% of GPs, 5% of all requests) were generated by the laboratory.A cohort of patients with normal CK results had a positive MSA, implying CK alone cannot be used to limit test access. Interestingly, 10 positive results had no CK requested implying they were not being investigated for myositis.Further work is needed to determine the specificity and sensitivity of these antibodies for patients with clinically defined myositis, and the appropriateness of allowing the test to be applied in the absence of any clinical evidence of IIM.The findings of this audit need to be further extended to look at other myositis including other anti-synthetases, HMGCoAR, MDA5, TIF-1γ, NPX-2.References:[1]Dalakas MC, Hohlfeld R (2003) Polymyositis and dermatomyositis. Lancet 362:971–982Disclosure of Interests:None declared
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Stevens M, Proudlove N, Ball J, Scott C. AB1131 STATISTICAL PROCESS CONTROL AND PROCESS MAPPING QUANTIFY THE EFFECTS OF HISTORICAL CHANGES TO THE CONNECTIVE TISSUE DISEASE TESTING ALGORITHM AND IDENTIFY AREAS FOR FUTURE IMPROVEMENT IN A LARGE DIAGNOSTIC IMMUNOLOGY SERVICE. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Pathology test turnaround times (TATs) are a limiting factor in patient flow through rheumatology services. Quality improvement (QI) methodologies such as Lean use tools including statistical process control (SPC) and process mapping to study the performance of the whole of a clinical pipeline, expose unnecessary complexity (non-value-adding activity), and streamline processes and staff roles.Objectives:Understand effects of changes made to CTD testing algorithm over last 12 years by measuring some of the effects on TATs. Model current processes and suggest changes to workflow to improve TAT.Methods:High-level flow diagrams of the current testing algorithm, and low-level process maps of analyser and staff processes were drawn.Activity and TATs (working days between report and booking date) for ANA, ENA, DNA and CCP tests were plotted as XmR control charts.Results:Finding 1: Largest referral laboratory does not currently operate a separate DNA monitoring workstream, resulting in unnecessary ANA and ENA testing (figure 1).Figure 1.Current testing strategy (left) and suggested improvement (right)Finding 2:Samples are handed off between 3 different lab benches, each of which may be staffed by a different staff member on a different day, and results processing involves handoff to a further 2 different staff members.Finding 3:ANA demand is close to capacity, ENA demand exceeds current capacity (table 1).Table 1.Demand for ANA, ENA and DNA tests, compared to capacityTestMedian Demand(tests/ day)Approx. Capacity(tests/ day)NotesANA74100Close to 80% recommended by the ILGsENA3836*Less capacity than demand!!DNA34100PlentyFinding 4:Stopping screening DNA requests on ANA result increased the number of DNA tests performed by about 10 samples per day (30%), but decreased turnaround time by a similar proportion (3.3 to 2.3 days, figure 2). It also reduced turnaround times of ANA and ENA tests.Figure 2.Control chart of average TAT of dsDNA antibodies by request dateConclusion:Typically for a QI project, the initially simple CTD testing pipeline has accumulated many changes made without consideration of whole system performance, and is now a struggle to run.Improvement ideas to be explored from this work include:Liaising with main referral lab to develop a DNA monitoring workstream to reduce unnecessary ANA and ENA testingReduce handoffs, sample journey around lab analysers, and staff hands-on time by:changing ANA test methodology to same as DNAcreating new staff roles (analyser operators to perform validation/ authorisation steps)Create more capacity for ENA testing by increasing the frequency of this test on the weekly rotaCreate more capacity for service expansion by running analysers at weekends (staff consultation required)Reduce demand on service by engaging and educating requestorsImprove TAT for DNA by:processing samples the day they are booked in, instead of 1 day laterauto-validating runs…using control charts to measure improvementDisclosure of Interests:None declared
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Brooks H, Addeo A, Comins C, Stevens M, Li L, Wade L, Oltean S. EP1.01-66 Detection of Genomic Mutations in Blood and Urine ctDNA in Lung Adenocarcinoma with EGFR Mutation on Tissue – An Interim Progress Report. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.2039] [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: 10/25/2022]
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Stevens M, Star E, Lee M, Innes E, Li L, Bowler E, Harper S, Bates DO, Oltean S. The VEGF-A exon 8 splicing-sensitive fluorescent reporter mouse is a novel tool to assess the effects of splicing regulatory compounds in vivo. RNA Biol 2019; 16:1672-1681. [PMID: 31432737 PMCID: PMC6844573 DOI: 10.1080/15476286.2019.1652522] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 02/08/2023] Open
Abstract
Vascular endothelial growth factor (VEGF)-A is differentially spliced to give two functionally different isoform families; pro-angiogenic, pro-permeability VEGF-Axxx and anti-angiogenic, anti-permeability VEGF-Axxxb. VEGF-A splicing is dysregulated in several pathologies, including cancer, diabetes, and peripheral arterial disease. The bichromatic VEGF-A splicing-sensitive fluorescent reporter harboured in a transgenic mouse is a novel approach to investigate the splicing patterns of VEGF-A in vivo. We generated a transgenic mouse harbouring a splicing-sensitive fluorescent reporter designed to mimic VEGF-A terminal exon splicing (VEGF8ab) by insertion into the ROSA26 genomic locus. dsRED expression denotes proximal splice site selection (VEGF-Axxx) and eGFP expression denotes distal splice site selection (VEGF-Axxxb). We investigated the tissue-specific expression patterns in the eye, skeletal muscle, cardiac muscle, kidney, and pancreas, and determined whether the splicing pattern could be manipulated in the same manner as endogenous VEGF-A by treatment with the SRPK1 inhibitor SPHINX 31. We confirmed expression of both dsRED and eGFP in the eye, skeletal muscle, cardiac muscle, kidney, and pancreas, with the highest expression of both fluorescent proteins observed in the exocrine pancreas. The ratio of dsRED and eGFP matched that of endogenous VEGF-Axxx and VEGF-Axxxb. Treatment of the VEGF8ab mice with SPHINX 31 increased the mRNA and protein eGFP/dsRED ratio in the exocrine pancreas, mimicking endogenous VEGF-A splicing. The VEGF-A exon 8 splicing-sensitive fluorescent reporter mouse is a novel tool to assess splicing regulation in the individual cell-types and tissues, which provides a useful screening process for potentially therapeutic splicing regulatory compounds in vivo.
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Affiliation(s)
- M Stevens
- Institute of Biomedical and Clinical Science, Medical School, College of Medicine and Health, University of Exeter, Exeter, UK
| | - E Star
- Bristol Renal, School of Clinical Sciences, University of Bristol, Bristol, UK
| | - M Lee
- Bristol Renal, School of Clinical Sciences, University of Bristol, Bristol, UK
| | - E Innes
- Institute of Biomedical and Clinical Science, Medical School, College of Medicine and Health, University of Exeter, Exeter, UK
| | - L Li
- Institute of Biomedical and Clinical Science, Medical School, College of Medicine and Health, University of Exeter, Exeter, UK
| | - E Bowler
- Institute of Biomedical and Clinical Science, Medical School, College of Medicine and Health, University of Exeter, Exeter, UK
| | - S Harper
- Institute of Biomedical and Clinical Science, Medical School, College of Medicine and Health, University of Exeter, Exeter, UK.,School of Physiology, Pharmacology & Neuroscience, University of Bristol, Bristol, UK
| | - D O Bates
- Cancer Biology, Division of Cancer and Stem Cells, School of Medicine, University of Nottingham, Nottingham, UK
| | - S Oltean
- Institute of Biomedical and Clinical Science, Medical School, College of Medicine and Health, University of Exeter, Exeter, UK
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Supré K, Roupie V, Ribbens S, Stevens M, Boyen F, Roels S. Short communication: Mycolicibacterium smegmatis, basonym Mycobacterium smegmatis, causing pyogranulomatous mastitis and its cross-reactivity in bovine (para)tuberculosis testing. J Dairy Sci 2019; 102:8405-8409. [PMID: 31301842 DOI: 10.3168/jds.2019-16610] [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] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 04/16/2019] [Indexed: 11/19/2022]
Abstract
Different mycobacterial species are encountered in bovine medicine. The fastidiously growing mycobacteria (Mycobacterium bovis as the cause of bovine tuberculosis, and Mycobacterium avium ssp. paratuberculosis, MAP, as the cause of paratuberculosis) are well known and targeted in eradication/control or monitoring programs in different countries, whereas the rapidly growing species is only rarely identified from bovine disease. The latter have occasionally been reported as the cause of bovine clinical mastitis, but recent reports are scarce. In this study, Mycolicibacterium smegmatis (basonym Mycobacterium smegmatis) was identified as cause of granulomatous, relapsing clinical mastitis in 2 cows from one Belgian dairy herd. Milk, blood, and fecal samples were collected, as well as tissue samples after the cows were culled. Serological analysis conducted on milk and serum samples resulted in positive reactions for MAP, but negative for Mycobacterium bovis. Production of IFN-γ showed sensitization with mycobacteria or similar organisms, other than M. bovis, in one cow. Detection of MAP by bacteriological culture and IS900-based quantitative PCR on milk and feces remained negative. In conclusion, this paper describes M. smegmatis as a cause of bovine clinical mastitis in Belgium and suggests cross-reactivity of the intramammary M. smegmatis infection with routinely used serological tests for MAP.
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Affiliation(s)
- K Supré
- Flanders Milk Control Centre (MCC-Vlaanderen), 2500 Lier, Belgium.
| | - V Roupie
- Sciensano, Scientific Direction "Infectious diseases in animals," 1180 Brussel, Belgium
| | - S Ribbens
- Animal Health Service (DGZ-Vlaanderen), 8820 Torhout, Belgium
| | - M Stevens
- Vetoquinol, 2630 Aartselaar, Belgium
| | - F Boyen
- Department of Pathology, Bacteriology, and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium
| | - S Roels
- Sciensano, Scientific Direction "Infectious diseases in animals," 1180 Brussel, Belgium
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Tjalma W, Bosteels J, Cooremans I, Cosyns S, De Greve M, De Vree BP, Debruyne D, De Jonge ET, Desmedt E, Dubois P, Faes T, Francx M, Hamerlynck T, Makar AP, Maryns AS, Michiels I, Orye G, Platteeuw L, Pouseele B, Schutyser V, Segaert A, Stevens M, Tomassetti C, Trinh XB, Tummers P, van Calenbergh S, van Dam PA, Van Herendael B, Vanspauwen R, Vergote IB, Verguts J, Watty K, Weyers S. The rationale of opportunistic bilateral salpingectomies (OBS) during benign gynaecological and obstetric surgery: a consensus text of the Flemish Society of Obstetrics and Gynaecology (VVOG). Facts Views Vis Obgyn 2019; 11:177-187. [PMID: 31824638 PMCID: PMC6897518] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Ovarian cancer (OC), is a disease difficult to diagnose in an early stage implicating a poor prognosis. The 5-year overall survival in Belgium has not changed in the last 18 years and remains 44 %. There is no effective screening method (secondary prevention) to detect ovarian cancer at an early stage. Primary prevention of ovarian cancer came in the picture through the paradigm shift that the fallopian tube is often the origin of ovarian cancer and not the ovary itself. Opportunistic bilateral salpingectomy (OBS) during benign gynaecological and obstetric surgery might have the potential to reduce the risk of ovarian cancer by as much as 65 %. Bilateral risk-reducing salpingectomy during a benign procedure is feasible, safe, appears to have no impact on the ovarian function and seems to be cost effective. The key question is whether we should wait for a RCT or implement OBS directly in our daily practice. Guidelines regarding OBS within our societies are therefore urgently needed. Our recommendation is to inform all women without a child wish, undergoing a benign gynaecological or obstetrical surgical procedure about the pro's and the con's of OBS and advise a bilateral salpingectomy. Furthermore, there is an urgent need for a prospective registry of OBS. The present article is the consensus text of the Flemish Society of Obstetrics and Gynaecology (VVOG) regarding OBS.
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Affiliation(s)
- Waa Tjalma
- Antwerp University Hospital - University of Antwerp, Antwerpen
| | | | | | - S Cosyns
- Vrije Universiteit Brussel - Universitair Ziekenhuis Brussel, Brussel
| | | | - B P De Vree
- Antwerp University Hospital - University of Antwerp, Antwerpen
- ZNA Middelheim, Antwerpen
| | | | | | | | | | - T Faes
- AZ Sint Blasius Dendermonde, Dendermonde
| | | | | | - A P Makar
- ZNA Middelheim, Antwerpen
- Universitair Ziekenhuis Gent, Gent
| | | | | | - G Orye
- Jessa Ziekenhuis, Hasselt
| | | | | | - V Schutyser
- Vrije Universiteit Brussel - Universitair Ziekenhuis Brussel, Brussel
| | | | - M Stevens
- AZ Rivierenland campus Bornem, Bornem
| | | | - X B Trinh
- Antwerp University Hospital - University of Antwerp, Antwerpen
| | | | | | - P A van Dam
- Antwerp University Hospital - University of Antwerp, Antwerpen
| | | | | | | | - J Verguts
- OLV van Lourdes Ziekenenhuis, Waregem
| | - K Watty
- AZ Delta campus Roeselare, Roeselare, Belgium
| | - S Weyers
- Universitair Ziekenhuis Gent, Gent
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23
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Stevens M, Piepers S, De Vliegher S. The effect of mastitis management input and implementation of mastitis management on udder health, milk quality, and antimicrobial consumption in dairy herds. J Dairy Sci 2019; 102:2401-2415. [PMID: 30692005 DOI: 10.3168/jds.2018-15237] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 06/18/2018] [Accepted: 11/08/2018] [Indexed: 11/19/2022]
Abstract
The main objective of this study was to evaluate evolutions in herd-level antimicrobial consumption (AMC) and in udder health and milk quality parameters between herds that received mastitis management input on a regular basis (actively advised by the first author; referred to as intervention herds) and herds that did not (referred to as control herds). Strikingly, herds in the intervention group had a significantly higher prevalence of new intramammary infections compared with those in the control group. No significant differences were observed in the percentage of chronically infected cows, the bulk milk somatic cell count, and the bacterial and coliform count between the intervention and control herds, nor did the herd-level AMC differ between them. Furthermore, the level of mastitis management applied in each herd was assessed and scored [mastitis management score (MMS); higher is better], as was the level of implementation of different recommended mastitis management practices over time, expressed as the mastitis management implementation score (MMIS; higher is better). A large variation was observed in MMS and MMIS in the intervention herds (median = 16 and range = 12 to 22; median = 13 and range = -5 to 31, respectively) and the control herds (median = 16 and range = 9 to 22; median = 9 and range = -13 to 22, respectively). Also, intervention herds in which the herd veterinarian attended each herd visit executed by the first author had a higher MMS and MMIS (median = 20 and 24, respectively) compared with herds in which the veterinarian sometimes (median = 16 and 17, respectively) or never (median = 16.5 and 7.5, respectively) attended the herd visits. Further, the association between MMS or MMIS on one hand and udder health, milk quality, and the herd-level AMC over time on the other was studied using the data of both groups of herds. Better mastitis management was associated with a reduction in the consumption of antimicrobials that are critically important for human health over time and with lower bacterial counts and bulk milk somatic cell count. Better mastitis management can be helpful in obtaining better milk quality and more responsible use of critically important antimicrobials on dairy farms.
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Affiliation(s)
- M Stevens
- M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium
| | - S Piepers
- M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium
| | - S De Vliegher
- M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium.
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Jabbour R, Kapnisi K, Mawad D, Handa B, Couch L, Mansfield C, Perbillini F, Terracciano C, Stevens M, Lyon A, Smith G, Peters N, Ng FS, Harding S. P5705Conductive polymers affect myocardial conduction velocity but are not pro-arrhythmic. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5705] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- R Jabbour
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - K Kapnisi
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - D Mawad
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - B Handa
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - L Couch
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - C Mansfield
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - F Perbillini
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - C Terracciano
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - M Stevens
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - A Lyon
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - G Smith
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - N Peters
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - F S Ng
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
| | - S Harding
- Imperial College Healthcare NHS Trust, imperial, London, United Kingdom
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Stevens M, Rees T, Coffee P, Haslam SA, Steffens NK, Polman R. Leaders promote attendance in sport and exercise sessions by fostering social identity. Scand J Med Sci Sports 2018; 28:2100-2108. [PMID: 29772093 DOI: 10.1111/sms.13217] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/08/2018] [Indexed: 11/30/2022]
Abstract
Sport and exercise participation exert a positive effect on numerous aspects of individuals' health. Although sport and exercise leaders have generally been observed to play a key role in shaping group members' behavior, our understanding of their impact on group members' attendance in sport and exercise sessions is limited. To address this, and building on promising findings in other domains, we examined the associations between perceptions of sport and exercise leaders' engagement in social identity leadership, group identification, and attendance. A sample of 583 participants from sports teams (n = 307) and exercise groups (n = 276) completed questionnaires measuring identity leadership, group identification, and attendance. Analyses demonstrated that perceptions of leader engagement in social identity leadership were positively associated with members' group identification, and that this in turn was positively associated with their attendance in either a sports group or an exercise group. Moreover, there was a significant indirect effect for perceptions of leader engagement in identity leadership on group members' attendance through their greater identification with these groups. Findings highlight the importance of considering the impact sport and exercise leaders have on group members' attendance and suggest that leaders who represent, advance, create, and embed a shared sense of identity (ie, a shared sense of "us") among attendees can promote participation in sport and exercise.
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Affiliation(s)
- M Stevens
- Bournemouth University, Department of Sport and Physical Activity, Faculty of Management, Bournemouth, Poole, UK
| | - T Rees
- Bournemouth University, Department of Sport and Physical Activity, Faculty of Management, Bournemouth, Poole, UK
| | - P Coffee
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, UK
| | - S A Haslam
- School of Psychology, The University of Queensland, Brisbane, QLD, Australia
| | - N K Steffens
- School of Psychology, The University of Queensland, Brisbane, QLD, Australia
| | - R Polman
- School of Exercise and Nutrition Sciences, Queensland University of Technology, Brisbane, QLD, Australia
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Gerbers JG, Dierselhuis EF, Stevens M, Ploegmakers JJW, Bulstra SK, Jutte PC. Computer-assisted surgery compared to fluoroscopy in curettage of atypical cartilaginous tumors / chondrosarcoma grade 1 in the long bones. PLoS One 2018; 13:e0197033. [PMID: 29771927 PMCID: PMC5957352 DOI: 10.1371/journal.pone.0197033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Accepted: 04/25/2018] [Indexed: 11/18/2022] Open
Abstract
Introduction Fluoroscopy is currently the standard imaging modality for curettage of atypical cartilaginous tumors/chondrosarcoma grade 1 (ACT/CS1). Computer-assisted surgery (CAS) is a possible alternative, offering higher resolution imaging and continuous three-dimensional feedback without ionizing radiation use. CAS hypothetically makes curettage more accurate, thereby decreasing residue or recurrence rate. This study aims to compare CAS and fluoroscopy in curettage of ACT/CS1. Patients and methods A single center retrospective cohort study was performed. CAS and fluoroscopy were used in parallel. Included were patients who had curettage for ACT/CS1in the long bones, with a minimum follow-up of 24 months. Tumor volume was determined on pre-operative MRI scans. Outcome comprised local recurrence rates, residue rates, complications and procedure time. Results Seventy-seven patients were included, 17 in the CAS cohort, 60 in the fluoroscopy cohort. Tumor volume was significantly larger in the CAS cohort (p = 0.04). There were no recurrences in either group. Residual tumor (2/17 vs. 7/60), complications did not differ significantly: fracture rate (3/17 vs. 6/60); nor did surgical time (1.26h vs. 1.34h). Discussion CAS curettage showed good oncologic results. Outcome was comparable to fluoroscopy, while not using ionizing radiation. There was no significant difference in surgical time. Residue rates can likely be decreased with specific software functions and surgical tools.
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Affiliation(s)
- J. G. Gerbers
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- * E-mail:
| | - E. F. Dierselhuis
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - M. Stevens
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - J. J. W. Ploegmakers
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - S. K. Bulstra
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - P. C. Jutte
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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Stevens M, Piepers S, Supré K, De Vliegher S. Antimicrobial consumption on dairy herds and its association with antimicrobial inhibition zone diameters of non-aureus staphylococci and Staphylococcus aureus isolated from subclinical mastitis. J Dairy Sci 2018; 101:3311-3322. [DOI: 10.3168/jds.2017-13365] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 11/27/2017] [Indexed: 01/05/2023]
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Badás EP, Martínez J, Rivero-de Aguilar J, Ponce C, Stevens M, Merino S. Colour change in a structural ornament is related to individual quality, parasites and mating patterns in the blue tit. Naturwissenschaften 2018; 105:17. [PMID: 29404701 DOI: 10.1007/s00114-018-1539-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 07/21/2017] [Revised: 10/27/2017] [Accepted: 01/11/2018] [Indexed: 10/18/2022]
Abstract
Carry-over effects refer to processes that occur in one season and influence fitness in the following. In birds, two costly activities, namely reproduction and moult, are restricted to a small time window, and sometimes overlap. Thus, colour in newly moulted feathers is likely to be affected by the costs of reproduction. Using models of bird vision we investigated male colour change in a free-living population of blue tits (Cyanistes caeruleus) in three sampling occasions: spring 1, winter and spring 2. We related crown, tail, breast and cheek feather colouration after the moult (winter) to the intensity of infections by blood parasites during reproduction (spring 1). In the following spring (spring 2), we explored mating patterns with respect to changes in feather colour (springs 1 vs. 2). Males that were less intensely infected by the malaria parasite Plasmodium while breeding showed purer white cheek feathers in winter, which may indicate higher feather quality. Increased brightness in the white cheek was associated with better body condition during reproduction. In the following season, males with brighter cheeks paired with females that had noticeably brighter cheek patches compared to the male's previous mate. These results suggest that the conditions experienced during reproduction are likely to affect moult and thus feather colouration, at least in the white patch. High quality individuals may allocate resources efficiently during reproduction increasing future reproductive success through variation in mating patterns. Carry-over effects from reproduction might extend not only to the non-breeding phase, but also to the following breeding season.
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Affiliation(s)
- E P Badás
- Department of Evolutionary Ecology, National Museum of Natural Sciences, Jose Gutierrez Abascal 2, 28006, Madrid, Spain.
| | - J Martínez
- Department of Biomedicine and Biotechnology, University of Alcalá de Henares, Ctra. Madrid-Barcelona km 33600, 28871 Alcalá de Henares, Madrid, Spain
| | - J Rivero-de Aguilar
- Department of Biomedicine and Biotechnology, University of Alcalá de Henares, Ctra. Madrid-Barcelona km 33600, 28871 Alcalá de Henares, Madrid, Spain
| | - C Ponce
- Department of Evolutionary Ecology, National Museum of Natural Sciences, Jose Gutierrez Abascal 2, 28006, Madrid, Spain
| | - M Stevens
- Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, Cornwall, TR10 9FE, UK
| | - S Merino
- Department of Evolutionary Ecology, National Museum of Natural Sciences, Jose Gutierrez Abascal 2, 28006, Madrid, Spain
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Olthof M, Stevens M, Dijkstra B, Bulstra SK, Van Den Akker-Scheek I. Actual and perceived nursing workload and the complexity of patients with total hip arthroplasty. Appl Nurs Res 2018; 39:195-199. [PMID: 29422158 DOI: 10.1016/j.apnr.2017.11.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 11/17/2017] [Accepted: 11/19/2017] [Indexed: 11/30/2022]
Affiliation(s)
- M Olthof
- University of Groningen, University Medical Center Groningen, Department of Orthopedics, The Netherlands.
| | - M Stevens
- University of Groningen, University Medical Center Groningen, Department of Orthopedics, The Netherlands.
| | - B Dijkstra
- Medical Center Leeuwarden, The Netherlands.
| | - S K Bulstra
- University of Groningen, University Medical Center Groningen, Department of Orthopedics, The Netherlands.
| | - I Van Den Akker-Scheek
- University of Groningen, University Medical Center Groningen, Department of Orthopedics, The Netherlands.
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Jain P, Shehab S, Stevens M, Jansz P, Macdonald P, Hayward C. Evidence for Pulsatile Inertance as a Cause of Outflow Conduit Pressure Loss in the Heartware HVAD. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.124] [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: 10/28/2022]
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31
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Abali F, Stevens M, Tibbe AGJ, Terstappen LWMM, van der Velde PN, Schasfoort RBM. Isolation of single cells for protein therapeutics using microwell selection and Surface Plasmon Resonance imaging. Anal Biochem 2017; 531:45-47. [PMID: 28545866 DOI: 10.1016/j.ab.2017.05.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 03/30/2017] [Revised: 05/17/2017] [Accepted: 05/19/2017] [Indexed: 10/19/2022]
Abstract
Here the feasibility is demonstrated that by combining Surface Plasmon Resonance Imaging (SPRi) and self-sorting microwell technology product secretion of individual cells can be monitored. Additionally isolation of the selected cells can be performed by punching the cells from the microwells using coordinates of the positions of microwells obtained with SPRi. Cells of interest can be retrieved sterile from the microwell array for further cultivation.
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Affiliation(s)
- F Abali
- Medical Cell Biophysics Group, MIRA Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands
| | - M Stevens
- VyCAP, Abraham Rademakerstraat 41, 7425PG Deventer, The Netherlands
| | - A G J Tibbe
- VyCAP, Abraham Rademakerstraat 41, 7425PG Deventer, The Netherlands
| | - L W M M Terstappen
- Medical Cell Biophysics Group, MIRA Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands.
| | | | - R B M Schasfoort
- Medical Cell Biophysics Group, MIRA Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands; Interfluidics BV, Duizendblad 28, 7483 AL Haaksbergen, The Netherlands
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Arenas LM, Stevens M. Diversity in warning coloration is easily recognized by avian predators. J Evol Biol 2017; 30:1288-1302. [PMID: 28338250 PMCID: PMC5518184 DOI: 10.1111/jeb.13074] [Citation(s) in RCA: 14] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 01/14/2017] [Accepted: 03/10/2017] [Indexed: 11/29/2022]
Abstract
Warning coloration is a widespread strategy to alert predators about prey unprofitability. The success of this strategy partly depends on predators being able to learn and recognize certain signals as indicators of toxicity, and theory predicts that this is easier if signals converge on similar colours. However, the diversity in warning signal form is astonishing, contradicting predictions. Here, we quantified ladybird signal diversity with respect to avian vision, measuring how unique and discernible each signal is from one another. In addition, we measured signal conspicuousness against a series of backgrounds, namely an average green, average brown, and where we collected each species, to determine whether signals are more contrasting against the ladybirds' local substrates than compared to average ones. This allowed us to establish whether there are local adaptations in conspicuousness that promote signal diversity. We found that while ladybird signals are unique and recognizable, specialist species are more contrasting against the background they are most commonly found on. However, overall our study suggests that warning signals have evolved to be effective against a wide range of natural backgrounds, partly explaining the success of this strategy in nature.
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Affiliation(s)
- L M Arenas
- Department of Zoology, University of Cambridge, Cambridge, UK.,Centre for Ecology & Conservation, College of Life & Environmental Sciences, University of Exeter, Penryn, Cornwall, UK
| | - M Stevens
- Centre for Ecology & Conservation, College of Life & Environmental Sciences, University of Exeter, Penryn, Cornwall, UK
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Kumar M, Dosaj A, Cook J, Modi S, Sanogo K, Masroor N, Bearman G, Stevens M. Use of an Anti-Helminth Tracking Card to Promote Adherence to Deworming
Treatment in Rural Honduras. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.378] [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: 11/27/2022] Open
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Modi S, Kosturakis D, Dosaj A, Bearman G, Cook J, Sanogo K, Masroor N, Bearman P, Stevens M. Improving Indoor Air Quality in Rural Honduras, One Stove at a
Time. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.394] [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: 11/15/2022] Open
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35
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Nijland H, Gerbers JG, Bulstra SK, Overbosch J, Stevens M, Jutte PC. Evaluation of accuracy and precision of CT-guidance in Radiofrequency Ablation for osteoid osteoma in 86 patients. PLoS One 2017; 12:e0169171. [PMID: 28384223 PMCID: PMC5383031 DOI: 10.1371/journal.pone.0169171] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 12/13/2016] [Indexed: 12/01/2022] Open
Abstract
Background and purpose Osteoid osteoma is a benign skeletal tumour that accounts for 2–3% of all bone tumours. The male-to-female ratio is around 4:1 and it predominates in children and young adults. The most common symptom is pain, frequently at night-time. Historically the main form of treatment has been surgical excision. With the development of Radiofrequency Ablation (RFA) there is a percutaneus alternative. Success rates of RFA are lower but the main advantage is the minimal invasive character of the therapy and the low complication rate. As a result of the minimal invasiveness the hospitalization- and rehabilitation periods are relatively short. However, in current literature no values for accuracy and precision are known for the CT-guided positioning. Methods Accuracy and precision of the needle position are determined for 86 procedures. Furthermore the population is divided into groups based on tumour diameter, location and procedure outcome. Results The clinical success rate was 81.4%. In 79% of procedures complete ablation was achieved. Accuracy was 2.84 mm on average, precision was 2.94 mm. Accuracy was significantly lower in more profound lesions. Accuracy in tibia and fibula was significantly higher compared to the femur. No significant difference was found between different tumour diameters. Interpretation The accuracy and precision found are considered good. Needle position is of major importance for procedure outcomes. The question however rises how the results of this therapy will turn out in treatment of larger tumours.
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Affiliation(s)
- H. Nijland
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
- * E-mail:
| | - J. G. Gerbers
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - S. K. Bulstra
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - J. Overbosch
- Department of Radiology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - M. Stevens
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - P. C. Jutte
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
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Thompson A, Stevens M, Collin I, Wennike N. Evolving sepsis definitions and their impact on Acute Medical Units. Acute Med 2017; 16:25-29. [PMID: 28424802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
BACKGROUND There are currently several different definitions for sepsis. This study looked at what proportion of acute medical admissions were identified by the different definitions, what correlation they have, and how many patients would require a review with results in 1 hour. METHODS Data on 212 admissions was collected, on time of admission and review, and number of patients with sepsis by each diagnostic criteria calculated. RESULTS The NICE criteria identified 69% of admissions as requiring review within one hour, compared to 6% with qSOFA and 18% with previous sepsis definitions. The mean time to review was 1hr 18min, and only 50% of patients meeting the NICE criteria were reviewed within one hour. CONCLUSIONS The proposed NICE guidance will be challenging to implement with current resources.
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Mattart L, Stevens M, Magis D, Magotteaux P, Jehaes C, Monami B, Markiewicz S. [Clinical pathway evaluation for left colectomy in abdominal surgery]. Rev Med Liege 2017; 72:45-50. [PMID: 28387078] [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: 06/07/2023]
Abstract
At the end of 2008, a left colectomy clinical pathway was implemented at Clinique Saint-Joseph (CHC) in Liège (Belgium). A sample of 213 patients with benign or malignant pathology requiring laparoscopic left colon resection was included in this clinical pathway during the years 2009 to 2015. We focused on the compliance with the protocol, on the complication rate and the incidence of re-hospitalization within 30 days after surgery. In comparison with a historical control group, we observed that the compliance was excellent (superior to 80 %) from 2009 to 2015. The re-hospitalization did not differ though the complication rate decreased. Although the hospital stay was not our primary objective, it decreased significantly from 8 to 4 days (average). This analysis leads to the conclusion that the introduction of a clinical pathway, when it is well prepared and brings together all the implicated persons with the same goal, is directly beneficial to the patient and the quality of its management.
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Affiliation(s)
- L Mattart
- Service de Chirurgie Abdominale, Clinique Saint-Joseph (CHC), Liège, Belgique
| | - M Stevens
- Service de Chirurgie Abdominale, Clinique Saint-Joseph (CHC), Liège, Belgique
| | - D Magis
- Département de l'Education, Université de Liège, Belgique
| | - P Magotteaux
- Service de Chirurgie Abdominale, Clinique Saint-Joseph (CHC), Liège, Belgique
| | - C Jehaes
- Service de Chirurgie Abdominale, Clinique Saint-Joseph (CHC), Liège, Belgique
| | - B Monami
- Service de Chirurgie Abdominale, Clinique Saint-Joseph (CHC), Liège, Belgique
| | - S Markiewicz
- Service de Chirurgie Abdominale, Clinique Saint-Joseph (CHC), Liège, Belgique
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Doll M, Masroor N, Major Y, Doern C, Stevens M, Flemming M, Cooper K, Bearman G. Patient level risk factors for Carbapenem-Resistant Enterobacteriaceae at a low prevalence tertiary care center in the United States. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.11.108] [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: 10/20/2022] Open
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Wei C, Unsworth R, Davis N, Cox R, Bradley K, Stevens M, Crowne E. Survivors of childhood leukaemia treated with haematopoietic stem cell transplantation and total body irradiation should undergo screening for diabetes by oral glucose tolerance tests. Diabet Med 2016; 33:1347-51. [PMID: 26757409 DOI: 10.1111/dme.13060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/07/2016] [Indexed: 11/29/2022]
Abstract
AIMS Childhood cancer survivors treated with haematopoietic stem cell transplantation (HSCT) and total body irradiation are at an increased risk of developing diabetes early in life due to insulin resistance and β-cell dysfunction, but the optimal screening method is unknown. The National Institute for Health and Care Excellence guidelines for community diabetes screening recommend using fasting glucose ≥ 7 mmol/l and/or HbA1c ≥ 48 mmol/mol (6.5%) for diagnosis and, fasting glucose 5.5-6.9 mmol/l or HbA1c 42-47 mmol/mol (6-6.5%) to indicate high risk. This study aimed to evaluate the sensitivities of fasting glucose and HbA1c in the diagnosis of diabetes and impaired glucose tolerance in childhood HSCT survivors. METHOD The patients were 35 (male = 19) HSCT survivors from a single UK centre under follow-up from 2006 to 2013. Patients had a median age (range) of 19.2 (13.1-26.2) years and had been treated for acute lymphoblastic (n = 31) or myeloid (n = 4) leukaemia when aged 7.8 (2.4-16.7) years. The outcome measures were oral glucose tolerance test (OGTT), fasting glucose and HbA1c . RESULTS OGTT identified 6 patients with diabetes (120-min glucose ≥ 11.1 mmol/l), 12 with impaired glucose tolerance (120-min glucose 7.8-11.0 mmol/l) and 2 with impaired fasting glucose (≥ 7 mmol/l). Fasting glucose ≥ 7 mmol/l or HbA1c ≥ 48 mmol/mol identified two of the six patients with diabetes diagnosed on OGTT. Fasting glucose ≥ 5.5 mmol/l and HbA1c ≥ 42 mmol/mol identified three and two patients, respectively, with diabetes. Only 1 of 12 patients with impaired glucose tolerance had a fasting glucose ≥ 5.5 mmol/l and none had HbA1c ≥ 42 mmol/mol (≥ 6%). CONCLUSIONS The fasting glucose and HbA1c cut-offs used in UK population screening only identified one-third of HSCT survivors with diabetes and do not identify those at risk. Diabetes screening in HSCT survivors requires standard OGTTs.
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Affiliation(s)
- C Wei
- Bristol Royal Hospital for Children, Bristol, UK
| | - R Unsworth
- Bristol Royal Hospital for Children, Bristol, UK
| | - N Davis
- Bristol Royal Hospital for Children, Bristol, UK
| | - R Cox
- Bristol Royal Hospital for Children, Bristol, UK
| | - K Bradley
- Bristol Royal Hospital for Children, Bristol, UK
| | - M Stevens
- Bristol Royal Hospital for Children, Bristol, UK
| | - E Crowne
- Bristol Royal Hospital for Children, Bristol, UK.
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Huffman B, Stevens M. Preliminary Results of 10 Cases of Endoscopic Orbital Floor Repair. J Oral Maxillofac Surg 2016. [DOI: 10.1016/j.joms.2016.06.047] [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: 11/29/2022]
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41
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Gonzalez-Ocasio J, Stevens M. Autotransplantation of Third Molars With Platelet Rich Plasma for Immediate Replacement of Extracted Non-Restorable Teeth. J Oral Maxillofac Surg 2016. [DOI: 10.1016/j.joms.2016.06.056] [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]
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Paquin R, Stevens M. The Pectoralis Major Flap Anchor Design: A Novel Modification. J Oral Maxillofac Surg 2016. [DOI: 10.1016/j.joms.2016.06.145] [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]
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Kaumaya M, Guraker M, Dinnel J, Ryan M, Pryor R, Bearman G, Stevens M. Cervical cancer screening in developing regions: observations from
Paraiso, an underserved community in the Dominican Republic. Ann Glob Health 2016. [DOI: 10.1016/j.aogh.2016.04.193] [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: 11/30/2022] Open
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Caillet V, Colvill E, Szymura K, Stevens M, Booth J, Keall P. SU-G-JeP1-05: Clinical Impact of MLC Tracking for Lung SABR. Med Phys 2016. [DOI: 10.1118/1.4956980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Stevens M, Piepers S, De Vliegher S. Mastitis prevention and control practices and mastitis treatment strategies associated with the consumption of (critically important) antimicrobials on dairy herds in Flanders, Belgium. J Dairy Sci 2016; 99:2896-2903. [DOI: 10.3168/jds.2015-10496] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 12/28/2015] [Indexed: 01/10/2023]
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Blikman T, Rienstra W, van Raaij TM, ten Hagen AJ, Dijkstra B, Zijlstra WP, Bulstra SK, van den Akker-Scheek I, Stevens M. Duloxetine in OsteoArthritis (DOA) study: study protocol of a pragmatic open-label randomised controlled trial assessing the effect of preoperative pain treatment on postoperative outcome after total hip or knee arthroplasty. BMJ Open 2016; 6:e010343. [PMID: 26932142 PMCID: PMC4785324 DOI: 10.1136/bmjopen-2015-010343] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/14/2015] [Accepted: 12/17/2015] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION Residual pain is a major factor in patient dissatisfaction following total hip arthroplasty or total knee arthroplasty (THA/TKA). The proportion of patients with unfavourable long-term residual pain is high, ranging from 7% to 34%. There are studies indicating that a preoperative degree of central sensitisation (CS) is associated with poorer postoperative outcomes and residual pain. It is thus hypothesised that preoperative treatment of CS could enhance postoperative outcomes. Duloxetine has been shown to be effective for several chronic pain syndromes, including knee osteoarthritis (OA), in which CS is most likely one of the underlying pain mechanisms. This study aims to evaluate the postoperative effects of preoperative screening and targeted duloxetine treatment of CS on residual pain compared with care-as-usual. METHODS AND ANALYSIS This multicentre, pragmatic, prospective, open-label, randomised controlled trial includes patients with idiopathic hip/knee OA who are on a waiting list for primary THA/TKA. Patients at risk for CS will be randomly allocated to the preoperative duloxetine treatment programme group or the care-as-usual control group. The primary end point is the degree of postoperative pain 6 months after THA/TKA. Secondary end points at multiple time points up to 12 months postoperatively are: pain, neuropathic pain-like symptoms, (pain) sensitisation, pain catastrophising, joint-associated problems, physical activity, health-related quality of life, depressive and anxiety symptoms, and perceived improvement. Data will be analysed on an intention-to-treat basis. ETHICS AND DISSEMINATION The study is approved by the local Medical Ethics Committee (METc 2014/087) and will be conducted according to the principles of the Declaration of Helsinki (64th, 2013) and the Good Clinical Practice standard (GCP), and in compliance with the Medical Research Involving Human Subjects Act (WMO). TRIAL REGISTRATION NUMBER 2013-004313-41; Pre-results.
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Affiliation(s)
- T Blikman
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - W Rienstra
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - T M van Raaij
- Department of Orthopaedics, Martini Hospital Groningen, Groningen, The Netherlands
| | - A J ten Hagen
- Department of Anaesthesiology, Martini Hospital Groningen, Groningen, The Netherlands
| | - B Dijkstra
- Department of Orthopaedics, Medical Center Leeuwarden, Leeuwarden, The Netherlands
| | - W P Zijlstra
- Department of Orthopaedics, Medical Center Leeuwarden, Leeuwarden, The Netherlands
| | - S K Bulstra
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - I van den Akker-Scheek
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - M Stevens
- Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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Stevens M, Piepers S, Supré K, Dewulf J, De Vliegher S. Quantification of antimicrobial consumption in adult cattle on dairy herds in Flanders, Belgium, and associations with udder health, milk quality, and production performance. J Dairy Sci 2016; 99:2118-2130. [DOI: 10.3168/jds.2015-10199] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 11/15/2015] [Indexed: 11/19/2022]
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48
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Abstract
A mixed Müllerian mesodermal tumour (MMMT) is a rare aggressive carcinosarcoma. Metastatic progression is uncommon, and occurs via haematological, lymphatic and intraperitoneal spread. Although the latter is seen most frequently, the small intestine seems to be relatively preserved from disease progression with only one reported case of synchronous involvement. We report a case of metachronous MMMT involvement of the small bowel presenting with subacute obstruction that was successfully resected at operation.
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Affiliation(s)
| | - M Stevens
- Taunton and Somerset NHS Foundation Trust , UK
| | - D Mahon
- Taunton and Somerset NHS Foundation Trust , UK
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49
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Jakosky BM, Grebowsky JM, Luhmann JG, Connerney J, Eparvier F, Ergun R, Halekas J, Larson D, Mahaffy P, McFadden J, Mitchell DF, Schneider N, Zurek R, Bougher S, Brain D, Ma YJ, Mazelle C, Andersson L, Andrews D, Baird D, Baker D, Bell JM, Benna M, Chaffin M, Chamberlin P, Chaufray YY, Clarke J, Collinson G, Combi M, Crary F, Cravens T, Crismani M, Curry S, Curtis D, Deighan J, Delory G, Dewey R, DiBraccio G, Dong C, Dong Y, Dunn P, Elrod M, England S, Eriksson A, Espley J, Evans S, Fang X, Fillingim M, Fortier K, Fowler CM, Fox J, Gröller H, Guzewich S, Hara T, Harada Y, Holsclaw G, Jain SK, Jolitz R, Leblanc F, Lee CO, Lee Y, Lefevre F, Lillis R, Livi R, Lo D, Mayyasi M, McClintock W, McEnulty T, Modolo R, Montmessin F, Morooka M, Nagy A, Olsen K, Peterson W, Rahmati A, Ruhunusiri S, Russell CT, Sakai S, Sauvaud JA, Seki K, Steckiewicz M, Stevens M, Stewart AIF, Stiepen A, Stone S, Tenishev V, Thiemann E, Tolson R, Toublanc D, Vogt M, Weber T, Withers P, Woods T, Yelle R. MAVEN observations of the response of Mars to an interplanetary coronal mass ejection. Science 2015; 350:aad0210. [PMID: 26542576 DOI: 10.1126/science.aad0210] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Coupling between the lower and upper atmosphere, combined with loss of gas from the upper atmosphere to space, likely contributed to the thin, cold, dry atmosphere of modern Mars. To help understand ongoing ion loss to space, the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft made comprehensive measurements of the Mars upper atmosphere, ionosphere, and interactions with the Sun and solar wind during an interplanetary coronal mass ejection impact in March 2015. Responses include changes in the bow shock and magnetosheath, formation of widespread diffuse aurora, and enhancement of pick-up ions. Observations and models both show an enhancement in escape rate of ions to space during the event. Ion loss during solar events early in Mars history may have been a major contributor to the long-term evolution of the Mars atmosphere.
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Affiliation(s)
| | - J M Grebowsky
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - J G Luhmann
- University of California at Berkeley, Berkeley, CA, USA
| | - J Connerney
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - F Eparvier
- University of Colorado, Boulder, CO, USA
| | - R Ergun
- University of Colorado, Boulder, CO, USA
| | - J Halekas
- University of Iowa, Iowa City, IA, USA
| | - D Larson
- University of California at Berkeley, Berkeley, CA, USA
| | - P Mahaffy
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - J McFadden
- University of California at Berkeley, Berkeley, CA, USA
| | - D F Mitchell
- University of California at Berkeley, Berkeley, CA, USA
| | | | - R Zurek
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - S Bougher
- University of Michigan, Ann Arbor, MI, USA
| | - D Brain
- University of Colorado, Boulder, CO, USA
| | - Y J Ma
- University of California at Los Angeles, Los Angeles, CA, USA
| | - C Mazelle
- CNRS-Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France. University Paul Sabatier, Toulouse, France
| | | | - D Andrews
- Swedish Institute of Space Physics, Uppsala, Sweden
| | - D Baird
- NASA/Johnson Space Center, Houston, TX, USA
| | - D Baker
- University of Colorado, Boulder, CO, USA
| | - J M Bell
- National Institute of Aerospace, Hampton, VA, USA
| | - M Benna
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - M Chaffin
- University of Colorado, Boulder, CO, USA
| | - P Chamberlin
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - Y-Y Chaufray
- Laboratoire atmosphères, milieux et observations spatiales (LATMOS)-CNRS, Paris, France
| | - J Clarke
- Boston University, Boston, MA, USA
| | - G Collinson
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - M Combi
- University of Michigan, Ann Arbor, MI, USA
| | - F Crary
- University of Colorado, Boulder, CO, USA
| | - T Cravens
- University of Kansas, Lawrence, KS, USA
| | - M Crismani
- University of Colorado, Boulder, CO, USA
| | - S Curry
- University of California at Berkeley, Berkeley, CA, USA
| | - D Curtis
- University of California at Berkeley, Berkeley, CA, USA
| | - J Deighan
- University of Colorado, Boulder, CO, USA
| | - G Delory
- University of California at Berkeley, Berkeley, CA, USA
| | - R Dewey
- University of Colorado, Boulder, CO, USA
| | - G DiBraccio
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - C Dong
- University of Michigan, Ann Arbor, MI, USA
| | - Y Dong
- University of Colorado, Boulder, CO, USA
| | - P Dunn
- University of California at Berkeley, Berkeley, CA, USA
| | - M Elrod
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - S England
- University of California at Berkeley, Berkeley, CA, USA
| | - A Eriksson
- Swedish Institute of Space Physics, Uppsala, Sweden
| | - J Espley
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - S Evans
- Computational Physics, Inc., Boulder, CO, USA
| | - X Fang
- University of Colorado, Boulder, CO, USA
| | - M Fillingim
- University of California at Berkeley, Berkeley, CA, USA
| | - K Fortier
- University of Colorado, Boulder, CO, USA
| | - C M Fowler
- University of Colorado, Boulder, CO, USA
| | - J Fox
- Wright State University, Dayton, OH, USA
| | - H Gröller
- University of Arizona, Tucson, AZ, USA
| | - S Guzewich
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - T Hara
- University of California at Berkeley, Berkeley, CA, USA
| | - Y Harada
- University of California at Berkeley, Berkeley, CA, USA
| | - G Holsclaw
- University of Colorado, Boulder, CO, USA
| | - S K Jain
- University of Colorado, Boulder, CO, USA
| | - R Jolitz
- University of California at Berkeley, Berkeley, CA, USA
| | - F Leblanc
- Laboratoire atmosphères, milieux et observations spatiales (LATMOS)-CNRS, Paris, France
| | - C O Lee
- University of California at Berkeley, Berkeley, CA, USA
| | - Y Lee
- University of Michigan, Ann Arbor, MI, USA
| | - F Lefevre
- Laboratoire atmosphères, milieux et observations spatiales (LATMOS)-CNRS, Paris, France
| | - R Lillis
- University of California at Berkeley, Berkeley, CA, USA
| | - R Livi
- University of California at Berkeley, Berkeley, CA, USA
| | - D Lo
- University of Arizona, Tucson, AZ, USA
| | | | | | - T McEnulty
- University of Colorado, Boulder, CO, USA
| | - R Modolo
- Laboratoire atmosphères, milieux et observations spatiales (LATMOS)-CNRS, Paris, France
| | - F Montmessin
- Laboratoire atmosphères, milieux et observations spatiales (LATMOS)-CNRS, Paris, France
| | - M Morooka
- University of Colorado, Boulder, CO, USA
| | - A Nagy
- University of Michigan, Ann Arbor, MI, USA
| | - K Olsen
- University of Michigan, Ann Arbor, MI, USA
| | - W Peterson
- University of Colorado, Boulder, CO, USA
| | - A Rahmati
- University of Kansas, Lawrence, KS, USA
| | | | - C T Russell
- University of California at Los Angeles, Los Angeles, CA, USA
| | - S Sakai
- University of Kansas, Lawrence, KS, USA
| | - J-A Sauvaud
- CNRS-Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France. University Paul Sabatier, Toulouse, France
| | - K Seki
- Nagoya University, Nagoya, Japan
| | - M Steckiewicz
- CNRS-Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France. University Paul Sabatier, Toulouse, France
| | - M Stevens
- Naval Research Laboratory, Washington, DC, USA
| | | | - A Stiepen
- University of Colorado, Boulder, CO, USA
| | - S Stone
- University of Arizona, Tucson, AZ, USA
| | - V Tenishev
- University of Michigan, Ann Arbor, MI, USA
| | - E Thiemann
- University of Colorado, Boulder, CO, USA
| | - R Tolson
- North Carolina State University, Raleigh, NC, USA
| | - D Toublanc
- CNRS-Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France. University Paul Sabatier, Toulouse, France
| | - M Vogt
- Boston University, Boston, MA, USA
| | - T Weber
- University of Colorado, Boulder, CO, USA
| | | | - T Woods
- University of Colorado, Boulder, CO, USA
| | - R Yelle
- University of Arizona, Tucson, AZ, USA
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50
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Bougher S, Jakosky B, Halekas J, Grebowsky J, Luhmann J, Mahaffy P, Connerney J, Eparvier F, Ergun R, Larson D, McFadden J, Mitchell D, Schneider N, Zurek R, Mazelle C, Andersson L, Andrews D, Baird D, Baker DN, Bell JM, Benna M, Brain D, Chaffin M, Chamberlin P, Chaufray JY, Clarke J, Collinson G, Combi M, Crary F, Cravens T, Crismani M, Curry S, Curtis D, Deighan J, Delory G, Dewey R, DiBraccio G, Dong C, Dong Y, Dunn P, Elrod M, England S, Eriksson A, Espley J, Evans S, Fang X, Fillingim M, Fortier K, Fowler CM, Fox J, Gröller H, Guzewich S, Hara T, Harada Y, Holsclaw G, Jain SK, Jolitz R, Leblanc F, Lee CO, Lee Y, Lefevre F, Lillis R, Livi R, Lo D, Ma Y, Mayyasi M, McClintock W, McEnulty T, Modolo R, Montmessin F, Morooka M, Nagy A, Olsen K, Peterson W, Rahmati A, Ruhunusiri S, Russell CT, Sakai S, Sauvaud JA, Seki K, Steckiewicz M, Stevens M, Stewart AIF, Stiepen A, Stone S, Tenishev V, Thiemann E, Tolson R, Toublanc D, Vogt M, Weber T, Withers P, Woods T, Yelle R. Early MAVEN Deep Dip campaign reveals thermosphere and ionosphere variability. Science 2015; 350:aad0459. [PMID: 26542579 DOI: 10.1126/science.aad0459] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The Mars Atmosphere and Volatile Evolution (MAVEN) mission, during the second of its Deep Dip campaigns, made comprehensive measurements of martian thermosphere and ionosphere composition, structure, and variability at altitudes down to ~130 kilometers in the subsolar region. This altitude range contains the diffusively separated upper atmosphere just above the well-mixed atmosphere, the layer of peak extreme ultraviolet heating and primary reservoir for atmospheric escape. In situ measurements of the upper atmosphere reveal previously unmeasured populations of neutral and charged particles, the homopause altitude at approximately 130 kilometers, and an unexpected level of variability both on an orbit-to-orbit basis and within individual orbits. These observations help constrain volatile escape processes controlled by thermosphere and ionosphere structure and variability.
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Affiliation(s)
- S Bougher
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA.
| | - B Jakosky
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - J Halekas
- Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
| | - J Grebowsky
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - J Luhmann
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - P Mahaffy
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - J Connerney
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - F Eparvier
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - R Ergun
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - D Larson
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - J McFadden
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - D Mitchell
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - N Schneider
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - R Zurek
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - C Mazelle
- CNRS/Institut de Recherche en Astrophysique et Planétologie, Toulouse, France. University Paul Sabatier, Toulouse, France
| | - L Andersson
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - D Andrews
- Swedish Institute of Space Physics, Kiruna, Sweden
| | - D Baird
- NASA/Johnson Space Center, Houston, TX, USA
| | - D N Baker
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - J M Bell
- National Institute of Aerospace, Hampton, VA, USA
| | - M Benna
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - D Brain
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - M Chaffin
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - P Chamberlin
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - J-Y Chaufray
- Laboratoire Atmosphères, Milieux, Observations Spatiales /CNRS, Verrieres-le-Buisson, France
| | - J Clarke
- Department of Astronomy, Boston University, Boston, MA, USA
| | - G Collinson
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - M Combi
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA
| | - F Crary
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - T Cravens
- Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
| | - M Crismani
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - S Curry
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - D Curtis
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - J Deighan
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - G Delory
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - R Dewey
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - G DiBraccio
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - C Dong
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA
| | - Y Dong
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - P Dunn
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - M Elrod
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - S England
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - A Eriksson
- Swedish Institute of Space Physics, Kiruna, Sweden
| | - J Espley
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - S Evans
- Computational Physics, Springfield, VA, USA
| | - X Fang
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - M Fillingim
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - K Fortier
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - C M Fowler
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - J Fox
- Department of Physics, Wright State University, Fairborn, OH, USA
| | - H Gröller
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - S Guzewich
- NASA/Goddard Space Flight Center, Greenbelt, MD, USA
| | - T Hara
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - Y Harada
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - G Holsclaw
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - S K Jain
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - R Jolitz
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - F Leblanc
- Laboratoire Atmosphères, Milieux, Observations Spatiales /CNRS, Verrieres-le-Buisson, France
| | - C O Lee
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - Y Lee
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA
| | - F Lefevre
- Laboratoire Atmosphères, Milieux, Observations Spatiales /CNRS, Verrieres-le-Buisson, France
| | - R Lillis
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - R Livi
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
| | - D Lo
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - Y Ma
- Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA, USA
| | - M Mayyasi
- Department of Astronomy, Boston University, Boston, MA, USA
| | - W McClintock
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - T McEnulty
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - R Modolo
- Laboratoire Atmosphères, Milieux, Observations Spatiales /CNRS, Verrieres-le-Buisson, France
| | - F Montmessin
- Laboratoire Atmosphères, Milieux, Observations Spatiales /CNRS, Verrieres-le-Buisson, France
| | - M Morooka
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - A Nagy
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA
| | - K Olsen
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA
| | - W Peterson
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - A Rahmati
- Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
| | - S Ruhunusiri
- Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
| | - C T Russell
- Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA, USA
| | - S Sakai
- Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
| | - J-A Sauvaud
- CNRS/Institut de Recherche en Astrophysique et Planétologie, Toulouse, France. University Paul Sabatier, Toulouse, France
| | - K Seki
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi, Japan
| | - M Steckiewicz
- CNRS/Institut de Recherche en Astrophysique et Planétologie, Toulouse, France. University Paul Sabatier, Toulouse, France
| | - M Stevens
- Naval Research Laboratory, Washington, DC, USA
| | - A I F Stewart
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - A Stiepen
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - S Stone
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - V Tenishev
- CLaSP Department, University of Michigan, Ann Arbor, MI, USA
| | - E Thiemann
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - R Tolson
- National Institute of Aerospace, Hampton, VA, USA
| | - D Toublanc
- CNRS/Institut de Recherche en Astrophysique et Planétologie, Toulouse, France. University Paul Sabatier, Toulouse, France
| | - M Vogt
- Department of Astronomy, Boston University, Boston, MA, USA
| | - T Weber
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - P Withers
- Department of Astronomy, Boston University, Boston, MA, USA
| | - T Woods
- Laboratory for Atmospheric and Space Physics, University. of Colorado, Boulder, CO, USA
| | - R Yelle
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
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