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Thakrar S, Clevenger B, Mallett S. Corrigendum to 'Patient blood management and perioperative anaemia' [ BJA Education 17 (2017) 28-34]. BJA Educ 2024; 24:107. [PMID: 38375494 PMCID: PMC10874730 DOI: 10.1016/j.bjae.2023.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024] Open
Abstract
[This corrects the article DOI: 10.1093/bjaed/mkw061.].
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Crumière AJJ, Mallett S, Michelsen A, Rinnan R, Shik JZ. Nutritional challenges of feeding a mutualist: Testing for a nutrient-toxin tradeoff in fungus-farming leafcutter ants. Ecology 2022; 103:e3684. [PMID: 35315052 PMCID: PMC9286363 DOI: 10.1002/ecy.3684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 11/01/2021] [Accepted: 01/14/2022] [Indexed: 11/08/2022]
Abstract
The biochemical heterogeneity of food items often yields tradeoffs as each bite of food tends to contain some nutrients in surplus and others in deficit, as well as other less palatable or even toxic compounds. These multidimensional nutritional challenges are likely compounded when foraged foods are used to provision others (e.g. offspring or symbionts) with different physiological needs and tolerances. We explored these challenges in free-ranging colonies of leafcutter ants that navigate a diverse tropical forest to collect plant fragments they use to provision a co-evolved fungal cultivar. We tested the prediction that leafcutter farmers face provisioning tradeoffs between the nutritional quality and concentration of toxic tannins in foraged plant fragments. Chemical analyses of plant fragments sampled from the mandibles of Panamanian Atta colombica leafcutter ants provided little support for a nutrient-tannin foraging tradeoff. First, colonies foraged for plant fragments ranging widely in tannin concentration. Second, high tannin levels did not appear to restrict colonies from selecting plant fragments with blends of protein and carbohydrates that maximized cultivar performance when measured with in vitro experiments. We also tested whether tannins expand the realized nutritional niche selected by leafcutter ants into high-protein dimensions since: 1) tannins can bind proteins and reduce their accessibility during digestion, and 2) in vitro experiments have shown that excess protein provisioning reduces cultivar performance. Contrary to this hypothesis, the most protein-rich plant fragments did not have highest tannin levels. More generally, the approach developed here can be used to test how multidimensional interactions between nutrients and toxins shape the costs and benefits of providing care to offspring or symbionts.
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Affiliation(s)
- Antonin J J Crumière
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark
| | - Sophie Mallett
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark
| | - Anders Michelsen
- Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark
| | - Riikka Rinnan
- Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark
| | - Jonathan Z Shik
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark.,Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Ancon, Panama
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Albargi H, Mallett S, Berhane S, Booth S, Hawkes C, Perkins GD, Norton M, Foster T, Scholefield B. Bystander cardiopulmonary resuscitation for paediatric out-of-hospital cardiac arrest in England: An observational registry cohort study. Resuscitation 2021; 170:17-25. [PMID: 34748765 DOI: 10.1016/j.resuscitation.2021.10.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/23/2021] [Accepted: 10/28/2021] [Indexed: 01/14/2023]
Abstract
INTRODUCTION Bystander cardiopulmonary resuscitation (BCPR) is strongly advocated by resuscitation councils for paediatric out-of-hospital cardiac arrests (OHCAs). However, there are limited reports on rates of BCPR in children and its relationship with return of spontaneous circulation (ROSC) or survival outcomes. OBJECTIVE We describe the rate of BCPR and its association with any ROSC and survival- to- hospital-discharge. METHODS We conducted retrospective analysis of prospectively collected paediatric (<18 years of age) OHCA cases in England; we included specialist registry patients treated by emergency medical services (EMS) with known BCPR status and outcome between January 2014 and November 2018. Data included patient demographics, aetiology, witness status, initial rhythm, EMS, season, time of day and bystander status. Associations between BCPR, and any ROSC and survival-to-hospital-discharge outcomes were explored using multivariable logistic regression. RESULTS There were 2363 paediatric OHCAs treated across 11 EMS regions. BCPR was performed in 69.6% (1646/2363) of the cases overall (range 57.7% (206/367) to 83.7% (139/166) across EMS regions). Only 34.9% (550/1572) of BCPR cases were witnessed. Overall, any ROSC was achieved in 22.8% (523/2289) and survival to hospital discharge in 10.8% (225/2066). Adjusted odds ratio (aOR) for any ROSC was significantly improved following BCPR compared to no BCPR (aOR 1.37, 95% CI 1.03-1.81), but adjusted odds ratio for survival-to-hospital-discharge were similar (aOR 1.01, 95% CI 0.66-1.55). CONCLUSIONS BCPR was associated with improved rates of any ROSC but not survival-to-hospital-discharge. Variations in EMS BCPR rates may indicate opportunities for regional targeted increase in public BCPR education.
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Affiliation(s)
- H Albargi
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK; Emergency Medical Services Department, Faculty of Applied Medical Science, Jazan University, Jazan, Saudi Arabia
| | - S Mallett
- UCL Centre for Medical, University College London, London W1W 7TY, UK
| | - S Berhane
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and University of Birmingham, UK; Institute of Applied Health Research, University of Birmingham, UK
| | - S Booth
- Clinical Trials Unit, University of Warwick Medical School, Coventry, UK
| | - C Hawkes
- Clinical Trials Unit, University of Warwick Medical School, Coventry, UK
| | - G D Perkins
- Clinical Trials Unit, University of Warwick Medical School, Coventry, UK; Department of Critical Care Medicine, Heartlands Hospital, University Hospitals Birmingham, B9 5SS, UK
| | - M Norton
- North East Ambulance Service NHS Foundation Trust, Bernicia House, Newburn Riverside, Newcastle upon Tyne NE15 8NY, UK; School of Medicine, University of Sunderland, Chester Road, Sunderland SR1 3SD, UK
| | - T Foster
- East of England Ambulance Service NHS Trust, Whiting Way, Melbourn, Cambs SG8 6EN, UK
| | - B Scholefield
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK; Paediatric Intensive Care Unit, Birmingham Women's and Children's NHS Foundation Trust, Birmingham B4 6NH, UK.
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Crumière AJJ, James A, Lannes P, Mallett S, Michelsen A, Rinnan R, Shik JZ. The multidimensional nutritional niche of fungus-cultivar provisioning in free-ranging colonies of a neotropical leafcutter ant. Ecol Lett 2021; 24:2439-2451. [PMID: 34418263 PMCID: PMC9292433 DOI: 10.1111/ele.13865] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/01/2021] [Indexed: 11/29/2022]
Abstract
Foraging trails of leafcutter colonies are iconic scenes in the Neotropics, with ants collecting freshly cut plant fragments to provision a fungal food crop. We hypothesised that the fungus‐cultivar's requirements for macronutrients and minerals govern the foraging niche breadth of Atta colombica leafcutter ants. Analyses of plant fragments carried by foragers showed how nutrients from fruits, flowers and leaves combine to maximise cultivar performance. While the most commonly foraged leaves delivered excess protein relative to the cultivar's needs, in vitro experiments showed that the minerals P, Al and Fe may expand the leafcutter foraging niche by enhancing the cultivar's tolerance to protein‐biased substrates. A suite of other minerals reduces cultivar performance in ways that may render plant fragments with optimal macronutrient blends unsuitable for provisioning. Our approach highlights how the nutritional challenges of provisioning a mutualist can govern the multidimensional realised niche available to a generalist insect herbivore.
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Affiliation(s)
- Antonin J J Crumière
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Aidan James
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Pol Lannes
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Sophie Mallett
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Anders Michelsen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Riikka Rinnan
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Jonathan Z Shik
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark.,Smithsonian Tropical Research Institute, Balboa, Ancon, Panama
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Parker SG, Halligan S, Berrevoet F, de Beaux AC, East B, Eker HH, Jensen KK, Jorgensen LN, Montgomery A, Morales-Conde S, Miserez M, Renard Y, Sanders DL, Simons M, Slade D, Torkington J, Blackwell S, Dames N, Windsor ACJ, Mallett S. Reporting guideline for interventional trials of primary and incisional ventral hernia repair. Br J Surg 2021; 108:1050-1055. [PMID: 34286842 DOI: 10.1093/bjs/znab157] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 03/02/2021] [Accepted: 04/13/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND Primary and incisional ventral hernia trials collect unstandardized inconsistent data, limiting data interpretation and comparison. This study aimed to create two minimum data sets for primary and incisional ventral hernia interventional trials to standardize data collection and improve trial comparison. To support these data sets, standardized patient-reported outcome measures and trial methodology criteria were created. METHODS To construct these data sets, nominal group technique methodology was employed, involving 15 internationally recognized abdominal wall surgeons and two patient representatives. Initially a maximum data set was created from previous systematic and panellist reviews. Thereafter, three stages of voting took place: stage 1, selection of the number of variables for data set inclusion; stage 2, selection of variables to be included; and stage 3, selection of variable definitions and detection methods. A steering committee interpreted and analysed the data. RESULTS The maximum data set contained 245 variables. The three stages of voting commenced in October 2019 and had been completed by July 2020. The final primary ventral hernia data set included 32 variables, the incisional ventral hernia data set included 40 variables, the patient-reported outcome measures tool contained 25 questions, and 40 methodological criteria were chosen. The best known variable definitions were selected for accurate variable description. CT was selected as the optimal preoperative descriptor of hernia morphology. Standardized follow-up at 30 days, 1 year, and 5 years was selected. CONCLUSION These minimum data sets, patient-reported outcome measures, and methodological criteria have allowed creation of a manual for investigators aiming to undertake primary ventral hernia or incisional ventral hernia interventional trials. Adopting these data sets will improve trial methods and comparisons.
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Affiliation(s)
- S G Parker
- Abdominal Wall Unit, General Surgery, University College London Hospital, London, UK
| | - S Halligan
- Centre for Medical Imaging, University College London, London, UK
| | - F Berrevoet
- Department of General and Hepatobiliary Surgery and Liver Transplantation, University Hospital Ghent, Ghent, Belgium
| | - A C de Beaux
- Department of Surgery, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - B East
- 3rd Department of Surgery, Motol University Hospital, 1st and 2nd Medical Faculty of Charles University, Prague, Czech Republic
| | - H H Eker
- Department of Surgery, Amsterdam University Medical Centre, Amsterdam, the Netherlands
| | - K K Jensen
- General Surgery, Digestive Disease Centre, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - L N Jorgensen
- General Surgery, Digestive Disease Centre, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - A Montgomery
- Department of Surgery, Skåne University Hospital Malmö, Malmö, Sweden
| | - S Morales-Conde
- Unit of Innovation in Minimally Invasive Surgery, Department of Surgery, University Hospital Virgen del Rocio, University of Seville, Seville, Spain
| | - M Miserez
- Department of Abdominal Surgery, University Hospitals of the Katholieke Universiteit Leuven, Leuven, Belgium
| | - Y Renard
- Department of General, Digestive and Endocrine Surgery, Robert-Debré University Hospital, University of Reims Champagne-Ardenne, Reims, France
| | - D L Sanders
- Department of General and Upper Gastrointestinal Surgery, North Devon District Hospital, Barnstaple, UK
| | - M Simons
- Department of Surgery, Onze Lieve Vrouwe Gasthuis Hospital, Amsterdam, the Netherlands
| | - D Slade
- Intestinal Failure Unit, Salford Royal NHS Foundation Trust, Salford, UK
| | - J Torkington
- Department of Colorectal Surgery, University Hospital of Wales, Cardiff, UK
| | | | - N Dames
- Patient Representative, Glasgow, UK
| | - A C J Windsor
- Abdominal Wall Unit, General Surgery, University College London Hospital, London, UK
| | - S Mallett
- Centre for Medical Imaging, University College London, London, UK
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Parker SG, Mallett S, Quinn L, Wood CPJ, Boulton RW, Jamshaid S, Erotocritou M, Gowda S, Collier W, Plumb AAO, Windsor ACJ, Archer L, Halligan S. Corrigendum to: Identifying predictors of ventral hernia recurrence: systematic review and meta-analysis. BJS Open 2021; 5:6299993. [PMID: 34131707 PMCID: PMC8205854 DOI: 10.1093/bjsopen/zrab047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dinneen E, Grierson J, Haider A, Allen C, Heffernan-Ho D, Clow R, Freeman A, Briggs T, Nathan S, Brew-Graves C, Mallett S, Williams N, Persad R, Aning J, Oxley J, Oakley N, Morgan S, Tahir F, Ahmad I, Dutto L, Salmond J, Marzena R, Ben-Salha I, Kelly J, Shaw G. NeuroSAFE PROOF. Update on a multi-centre, pragmatic, RCT for men undergoing robot-assisted radical prostatectomy: Trial in progress. Eur Urol 2021. [DOI: 10.1016/s0302-2838(21)01245-8] [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: 10/20/2022]
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Parker SG, Mallett S, Quinn L, Wood CPJ, Boulton RW, Jamshaid S, Erotocritou M, Gowda S, Collier W, Plumb AAO, Windsor ACJ, Archer L, Halligan S. Identifying predictors of ventral hernia recurrence: systematic review and meta-analysis. BJS Open 2021; 5:6220253. [PMID: 33839749 PMCID: PMC8038271 DOI: 10.1093/bjsopen/zraa071] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 12/08/2020] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Ventra hernias are increasing in prevalence and many recur despite attempted repair. To date, much of the literature is underpowered and divergent. As a result there is limited high quality evidence to inform surgeons succinctly which perioperative variables influence postoperative recurrence. This systematic review aimed to identify predictors of ventral hernia recurrence. METHODS PubMed was searched for studies reporting prognostic data of ventral hernia recurrence between 1 January 1995 and 1 January 2018. Extracted data described hernia type (primary/incisional), definitions of recurrence, methods used to detect recurrence, duration of follow-up, and co-morbidity. Data were extracted for all potential predictors, estimates and thresholds described. Random-effects meta-analysis was used. Bias was assessed with a modified PROBAST (Prediction model Risk Of Bias ASsessment Tool). RESULTS Screening of 18 214 abstracts yielded 274 individual studies for inclusion. Hernia recurrence was defined in 66 studies (24.1 per cent), using 41 different unstandardized definitions. Three patient variables (female sex, age 65 years or less, and BMI greater than 25, 30, 35 or 40 kg/m2), five patient co-morbidities (smoking, diabetes, chronic obstructive pulmonary disease, ASA grade III-IV, steroid use), two hernia-related variables (incisional/primary, recurrent/primary), six intraoperative variables (biological mesh, bridged repair, open versus laparoscopic surgery, suture versus mesh repair, onlay/retrorectus, intraperitoneal/retrorectus), and six postoperative variables (any complication, surgical-site occurrence, wound infection, seroma, haematoma, wound dehiscence) were identified as significant prognostic factors for hernia recurrence. CONCLUSION This study summarized the current evidence base for predicting ventral hernia recurrence. Results should inform best practice and future research.
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Affiliation(s)
- S G Parker
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - S Mallett
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - L Quinn
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK.,University College London Medical School, London, UK
| | - C P J Wood
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - R W Boulton
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - S Jamshaid
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - M Erotocritou
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - S Gowda
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - W Collier
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - A A O Plumb
- Centre of Medical Imaging, University College Hospital, London, UK
| | - A C J Windsor
- Abdominal Wall Unit, Department of Surgery, University College Hospital, London, UK
| | - L Archer
- Centre for Prognosis Research, School of Primary, Community and Social Care, Keele University, Keele, UK
| | - S Halligan
- Centre of Medical Imaging, University College Hospital, London, UK
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Evans R, Taylor S, Kalasthry J, Sakai N, Miles A, Aboagye A, Agoramoorthy L, Ahmed S, Amadi A, Anand G, Atkin G, Austria A, Ball S, Bazari F, Beable R, Beare S, Beedham H, Beeston T, Bharwani N, Bhatnagar G, Bhowmik A, Blakeway L, Blunt D, Boavida P, Boisfer D, Breen D, Bridgewater J, Burke S, Butawan R, Campbell Y, Chang E, Chao D, Chukundah S, Clarke C, Collins B, Collins C, Conteh V, Couture J, Crosbie J, Curtis H, Daniel A, Davis L, Desai K, Duggan M, Ellis S, Elton C, Engledow A, Everitt C, Ferdous S, Frow A, Furneaux M, Gibbons N, Glynne-Jones R, Gogbashian A, Goh V, Gourtsoyianni S, Green A, Green L, Green L, Groves A, Guthrie A, Hadley E, Halligan S, Hameeduddin A, Hanid G, Hans S, Hans B, Higginson A, Honeyfield L, Hughes H, Hughes J, Hurl L, Isaac E, Jackson M, Jalloh A, Janes S, Jannapureddy R, Jayme A, Johnson A, Johnson E, Julka P, Kalasthry J, Karapanagiotou E, Karp S, Kay C, Kellaway J, Khan S, Koh D, Light T, Limbu P, Lock S, Locke I, Loke T, Lowe A, Lucas N, Maheswaran S, Mallett S, Marwood E, McGowan J, Mckirdy F, Mills-Baldock T, Moon T, Morgan V, Morris S, Morton A, Nasseri S, Navani N, Nichols P, Norman C, Ntala E, Nunes A, Obichere A, O'Donohue J, Olaleye I, Oliver A, Onajobi A, O'Shaughnessy T, Padhani A, Pardoe H, Partridge W, Patel U, Perry K, Piga W, Prezzi D, Prior K, Punwani S, Pyers J, Rafiee H, Rahman F, Rajanpandian I, Ramesh S, Raouf S, Reczko K, Reinhardt A, Robinson D, Rockall A, Russell P, Sargus K, Scurr E, Shahabuddin K, Sharp A, Shepherd B, Shiu K, Sidhu H, Simcock I, Simeon C, Smith A, Smith D, Snell D, Spence J, Srirajaskanthan R, Stachini V, Stegner S, Stirling J, Strickland N, Tarver K, Teague J, Thaha M, Train M, Tulmuntaha S, Tunariu N, van Ree K, Verjee A, Wanstall C, Weir S, Wijeyekoon S, Wilson J, Wilson S, Win T, Woodrow L, Yu D. Patient deprivation and perceived scan burden negatively impact the quality of whole-body MRI. Clin Radiol 2020; 75:308-315. [PMID: 31836179 DOI: 10.1016/j.crad.2019.10.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 10/30/2019] [Indexed: 01/26/2023]
Abstract
AIM To evaluate the association between the image quality of cancer staging whole-body magnetic resonance imaging (WB-MRI) and patient demographics, distress, and perceived scan burden. MATERIALS AND METHODS A sample of patients recruited prospectively to multicentre trials comparing WB-MRI with standard scans for staging lung and colorectal cancer were invited to complete two questionnaires. The baseline questionnaire, administered at recruitment, collated data on demographics, distress and co-morbidity. The follow-up questionnaire, completed after staging investigations, measured perceived WB-MRI scan burden (scored 1 low to 7 high). WB-MRI anatomical coverage, and technical quality was graded by a radiographic technician and grading combined to categorise the scan as "optimal", "sub-optimal" or "degraded". A radiologist categorised 30 scans to test interobserver agreement. Data were analysed using the chi-square, Fisher's exact, t-tests, and multinomial regression. RESULTS One hundred and fourteen patients were included in the study (53 lung, 61 colorectal; average age 65.3 years, SD=11.8; 66 men [57.9%]). Overall, 45.6% (n=52), scans were classified as "optimal" quality, 39.5% (n=45) "sub-optimal", and 14.9% (n=17) as "degraded". In adjusted analyses, greater deprivation level and higher patient-reported scan burden were both associated with a higher likelihood of having a sub-optimal versus an optimal scan (odds ratio [OR]: 4.465, 95% confidence interval [CI]: 1.454 to 13.709, p=0.009; OR: 1.987, CI: 1.153 to 3.425, p=0.013, respectively). None of the variables predicted the likelihood of having a degraded scan. CONCLUSIONS Deprivation and patients' perceived experience of the WB-MRI are related to image quality. Tailored protocols and individualised patient management before and during WB-MRI may improve image quality.
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Parker SG, Halligan S, Erotocritou M, Wood CPJ, Boulton RW, Plumb AAO, Windsor ACJ, Mallett S. A systematic methodological review of non-randomised interventional studies of elective ventral hernia repair: clear definitions and a standardised minimum dataset are needed. Hernia 2019; 23:859-872. [PMID: 31152271 PMCID: PMC6838456 DOI: 10.1007/s10029-019-01979-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 05/15/2019] [Indexed: 01/19/2023]
Abstract
BACKGROUND Ventral hernias (VHs) often recur after surgical repair and subsequent attempts at repair are especially challenging. Rigorous research to reduce recurrence is required but such studies must be well-designed and report representative and comprehensive outcomes. OBJECTIVE We aimed to assesses methodological quality of non-randomised interventional studies of VH repair by systematic review. METHODS We searched the indexed literature for non-randomised studies of interventions for VH repair, January 1995 to December 2017 inclusive. Each prospective study was coupled with a corresponding retrospective study using pre-specified criteria to provide matched, comparable groups. We applied a bespoke methodological tool for hernia trials by combining relevant items from existing published tools. Study introduction and rationale, design, participant inclusion criteria, reported outcomes, and statistical methods were assessed. RESULTS Fifty studies (17,608 patients) were identified: 25 prospective and 25 retrospective. Overall, prospective studies scored marginally higher than retrospective studies for methodological quality, median score 17 (IQR: 14-18) versus 15 (IQR 12-18), respectively. For the sub-categories investigated, prospective studies achieved higher median scores for their, 'introduction', 'study design' and 'participants'. Surprisingly, no study stated that a protocol had been written in advance. Only 18 (36%) studies defined a primary outcome, and only 2 studies (4%) described a power calculation. No study referenced a standardised definition for VH recurrence and detection methods for recurrence varied widely. Methodological quality did not improve with publication year or increasing journal impact factor. CONCLUSION Currently, non-randomised interventional studies of VH repair are methodologically poor. Clear outcome definitions and a standardised minimum dataset are needed.
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Affiliation(s)
- S G Parker
- The Abdominal Wall Unit UCLH, GI Services Department, University College London Hospital, 235 Euston Road, London, NW1 2BU, UK.
| | - S Halligan
- UCL Centre for Medical Imaging, 2nd Floor Charles Bell House, 43-45 Foley Street, London, W1W 7TS, UK
| | - M Erotocritou
- The Abdominal Wall Unit UCLH, GI Services Department, University College London Hospital, 235 Euston Road, London, NW1 2BU, UK
| | - C P J Wood
- The Abdominal Wall Unit UCLH, GI Services Department, University College London Hospital, 235 Euston Road, London, NW1 2BU, UK
| | - R W Boulton
- The Abdominal Wall Unit UCLH, GI Services Department, University College London Hospital, 235 Euston Road, London, NW1 2BU, UK
| | - A A O Plumb
- UCL Centre for Medical Imaging, 2nd Floor Charles Bell House, 43-45 Foley Street, London, W1W 7TS, UK
| | - A C J Windsor
- The Abdominal Wall Unit UCLH, GI Services Department, University College London Hospital, 235 Euston Road, London, NW1 2BU, UK
| | - S Mallett
- The Institute of Applied Health Research, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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Adderley NJ, Mallett S, Marshall T, Ghosh S, Rayman G, Bellary S, Coleman J, Akiboye F, Toulis KA, Nirantharakumar K. Temporal and external validation of a prediction model for adverse outcomes among inpatients with diabetes. Diabet Med 2018; 35:798-806. [PMID: 29485723 DOI: 10.1111/dme.13612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/22/2018] [Indexed: 02/06/2023]
Abstract
AIM To temporally and externally validate our previously developed prediction model, which used data from University Hospitals Birmingham to identify inpatients with diabetes at high risk of adverse outcome (mortality or excessive length of stay), in order to demonstrate its applicability to other hospital populations within the UK. METHODS Temporal validation was performed using data from University Hospitals Birmingham and external validation was performed using data from both the Heart of England NHS Foundation Trust and Ipswich Hospital. All adult inpatients with diabetes were included. Variables included in the model were age, gender, ethnicity, admission type, intensive therapy unit admission, insulin therapy, albumin, sodium, potassium, haemoglobin, C-reactive protein, estimated GFR and neutrophil count. Adverse outcome was defined as excessive length of stay or death. RESULTS Model discrimination in the temporal and external validation datasets was good. In temporal validation using data from University Hospitals Birmingham, the area under the curve was 0.797 (95% CI 0.785-0.810), sensitivity was 70% (95% CI 67-72) and specificity was 75% (95% CI 74-76). In external validation using data from Heart of England NHS Foundation Trust, the area under the curve was 0.758 (95% CI 0.747-0.768), sensitivity was 73% (95% CI 71-74) and specificity was 66% (95% CI 65-67). In external validation using data from Ipswich, the area under the curve was 0.736 (95% CI 0.711-0.761), sensitivity was 63% (95% CI 59-68) and specificity was 69% (95% CI 67-72). These results were similar to those for the internally validated model derived from University Hospitals Birmingham. CONCLUSIONS The prediction model to identify patients with diabetes at high risk of developing an adverse event while in hospital performed well in temporal and external validation. The externally validated prediction model is a novel tool that can be used to improve care pathways for inpatients with diabetes. Further research to assess clinical utility is needed.
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Affiliation(s)
- N J Adderley
- Institute of Applied Health Research, University of Birmingham, Birmingham
| | - S Mallett
- Institute of Applied Health Research, University of Birmingham, Birmingham
| | - T Marshall
- Institute of Applied Health Research, University of Birmingham, Birmingham
| | - S Ghosh
- Diabetes Department, University Hospitals Birmingham NHS Foundation Trust, Birmingham
| | - G Rayman
- Ipswich Hospital NHS Trust, Ipswich
| | - S Bellary
- Heart of England Foundation Trust, Birmingham, UK
| | - J Coleman
- Institute of Applied Health Research, University of Birmingham, Birmingham
| | | | - K A Toulis
- Institute of Applied Health Research, University of Birmingham, Birmingham
- 424 General Military Hospital, Thessaloniki, Greece
| | - K Nirantharakumar
- Institute of Applied Health Research, University of Birmingham, Birmingham
- Diabetes Department, University Hospitals Birmingham NHS Foundation Trust, Birmingham
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Parker SG, Wood CPJ, Butterworth JW, Boulton RW, Plumb AAO, Mallett S, Halligan S, Windsor ACJ. A systematic methodological review of reported perioperative variables, postoperative outcomes and hernia recurrence from randomised controlled trials of elective ventral hernia repair: clear definitions and standardised datasets are needed. Hernia 2018; 22:215-226. [PMID: 29305783 DOI: 10.1007/s10029-017-1718-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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: 07/08/2017] [Accepted: 12/23/2017] [Indexed: 12/17/2022]
Abstract
BACKGROUND This systematic review assesses the perioperative variables and post-operative outcomes reported by randomised controlled trials (RCTs) of VH repair. This review focuses particularly on definitions of hernia recurrence and techniques used for detection. OBJECTIVE Our aim is to identify and quantify the inconsistencies in perioperative variable and postoperative outcome reporting, so as to justify future development of clear definitions of hernia recurrence and a standardised dataset of such variables. METHODS The PubMed database was searched for elective VH repair RCTs reported January 1995 to March 2016 inclusive. Three independent reviewers performed article screening, and two reviewers independently extracted data. Hernia recurrence, recurrence rate, timing and definitions of recurrence, and techniques used to detect recurrence were extracted. We also assessed reported post-operative complications, standardised operative outcomes, patient reported outcomes, pre-operative CT scan hernia dimensions, intra-operative variables, patient co-morbidity, and hernia morphology. RESULTS 31 RCTs (3367 patients) were identified. Only 6 (19.3%) defined hernia recurrence and methods to detect recurrence were inconsistent. Sixty-four different clinical outcomes were reported across the RCTs, with wound infection (30 trials, 96.7%), hernia recurrence (30, 96.7%), seroma (29, 93.5%), length of hospital stay (22, 71%) and haematoma (21, 67.7%) reported most frequently. Fourteen (45%), 11 (35%) and 0 trials reported CT measurements of hernia defect area, width and loss of domain, respectively. No trial graded hernias using generally accepted scales. CONCLUSION VH RCTs report peri- and post-operative variables inconsistently, and with poor definitions. A standardised minimum dataset, including definitions of recurrence, is required.
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Affiliation(s)
- Samuel G Parker
- The Abdominal Wall Unit, University College London Hospital, University College London Hospitals NHS Foundation Trust, 235 Euston Road, London, NW1 2BU, UK.
| | - C P J Wood
- The Abdominal Wall Unit, University College London Hospital, University College London Hospitals NHS Foundation Trust, 235 Euston Road, London, NW1 2BU, UK
| | - J W Butterworth
- Upper Gastrointestinal Surgery Department, St Mary's Hospital, Imperial College Healthcare NHS Trust, Praed Street, London, W2 1NY, UK
| | - R W Boulton
- The Abdominal Wall Unit, University College London Hospital, University College London Hospitals NHS Foundation Trust, 235 Euston Road, London, NW1 2BU, UK
| | - A A O Plumb
- Centre for Medical Imaging, University College London, 3rd Floor East 250 Euston Road, London, NW1 2PG, UK
| | - S Mallett
- Institute of Applied Health Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - S Halligan
- Centre for Medical Imaging, University College London, 3rd Floor East 250 Euston Road, London, NW1 2PG, UK
| | - A C J Windsor
- The Abdominal Wall Unit, University College London Hospital, University College London Hospitals NHS Foundation Trust, 235 Euston Road, London, NW1 2BU, UK
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Prezzi D, Goh V, Virdi S, Mallett S, Grierson C, Breen D. Adaptive statistical iterative reconstruction improves image quality without affecting perfusion CT quantitation in primary colorectal cancer. Eur J Radiol Open 2017; 4:69-74. [PMID: 28616448 PMCID: PMC5458094 DOI: 10.1016/j.ejro.2017.05.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 05/22/2017] [Accepted: 05/22/2017] [Indexed: 01/28/2023] Open
Abstract
OBJECTIVES To determine the effect of Adaptive Statistical Iterative Reconstruction (ASIR) on perfusion CT (pCT) parameter quantitation and image quality in primary colorectal cancer. METHODS Prospective observational study. Following institutional review board approval and informed consent, 32 patients with colorectal adenocarcinoma underwent pCT (100 kV, 150 mA, 120 s acquisition, axial mode). Tumour regional blood flow (BF), blood volume (BV), mean transit time (MTT) and permeability surface area product (PS) were determined using identical regions-of-interests for ASIR percentages of 0%, 20%, 40%, 60%, 80% and 100%. Image noise, contrast-to-noise ratio (CNR) and pCT parameters were assessed across ASIR percentages. Coefficients of variation (CV), repeated measures analysis of variance (rANOVA) and Spearman' rank order correlation were performed with statistical significance at 5%. RESULTS With increasing ASIR percentages, image noise decreased by 33% while CNR increased by 61%; peak tumour CNR was greater than 1.5 with 60% ASIR and above. Mean BF, BV, MTT and PS differed by less than 1.8%, 2.9%, 2.5% and 2.6% across ASIR percentages. CV were 4.9%, 4.2%, 3.3% and 7.9%; rANOVA P values: 0.85, 0.62, 0.02 and 0.81 respectively. CONCLUSIONS ASIR improves image noise and CNR without altering pCT parameters substantially.
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Affiliation(s)
- D. Prezzi
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St. Thomas’ Hospital, Westminster Bridge Road, London SE1 7EH, United Kingdom
| | - V. Goh
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St. Thomas’ Hospital, Westminster Bridge Road, London SE1 7EH, United Kingdom
| | - S. Virdi
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St. Thomas’ Hospital, Westminster Bridge Road, London SE1 7EH, United Kingdom
| | - S. Mallett
- Institute of Applied Health Research, University of Birmingham, United Kingdom
| | - C. Grierson
- University Hospital Southampton NHS Foundation Trust, United Kingdom
| | - D.J. Breen
- University Hospital Southampton NHS Foundation Trust, United Kingdom
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Gomez G, Palmisano C, Mallett S, Burner E. 224 The Role of Nursing Experience in Perceptions of Family Presence During Resuscitation. Ann Emerg Med 2016. [DOI: 10.1016/j.annemergmed.2016.08.238] [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: 11/25/2022]
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Meier J, Filipescu D, Kozek-Langenecker S, Llau Pitarch J, Mallett S, Martus P, Matot I. Intraoperative transfusion practices in Europe. Br J Anaesth 2016; 116:255-61. [PMID: 26787795 PMCID: PMC4718146 DOI: 10.1093/bja/aev456] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/24/2015] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Transfusion of allogeneic blood influences outcome after surgery. Despite widespread availability of transfusion guidelines, transfusion practices might vary among physicians, departments, hospitals and countries. Our aim was to determine the amount of packed red blood cells (pRBC) and blood products transfused intraoperatively, and to describe factors determining transfusion throughout Europe. METHODS We did a prospective observational cohort study enrolling 5803 patients in 126 European centres that received at least one pRBC unit intraoperatively, during a continuous three month period in 2013. RESULTS The overall intraoperative transfusion rate was 1.8%; 59% of transfusions were at least partially initiated as a result of a physiological transfusion trigger- mostly because of hypotension (55.4%) and/or tachycardia (30.7%). Haemoglobin (Hb)- based transfusion trigger alone initiated only 8.5% of transfusions. The Hb concentration [mean (sd)] just before transfusion was 8.1 (1.7) g dl(-1) and increased to 9.8 (1.8) g dl(-1) after transfusion. The mean number of intraoperatively transfused pRBC units was 2.5 (2.7) units (median 2). CONCLUSION Although European Society of Anaesthesiology transfusion guidelines are moderately implemented in Europe with respect to Hb threshold for transfusion (7-9 g dl(-1)), there is still an urgent need for further educational efforts that focus on the number of pRBC units to be transfused at this threshold. CLINICAL TRIAL REGISTRATION NCT 01604083.
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Affiliation(s)
- J Meier
- Clinic of Anesthesiology and Intensive Care Medicine, Faculty of Medicine of the Kepler University Linz, Linz, Austria
| | - D Filipescu
- Emergency Institute of Cardiovascular Disease, University Bucharest, Bucharest, Romania
| | - S Kozek-Langenecker
- Department of Anesthesiology and Intensive Care Medicine, EKH Evangelic Hospital Vienna, Vienna, Austria
| | - J Llau Pitarch
- Department of Anesthesiology and Intensive Care Medicine, Hospital Clínico Universitario de Valencia, Valencia, Spain
| | - S Mallett
- Department of Anesthesiology, Royal Free Hospital Hampstead NHS Trust, London, UK
| | - P Martus
- Clinical Epidemiology, Eberhard Karls University Tübingen, Tübingen, Germany
| | - I Matot
- Department of Anesthesiology & Intensive Care Medicine & Pain, Tel Aviv Medical Centre, Tel Aviv, Israel
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Corcoran J, Wallbridge P, Rahman N, Mallett S, Hew M. S41 Looking Beyond The Pleura - A Systematic Review Of Thoracic Ultrasonography To Diagnose Lung Consolidation In Respiratory Failure. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.47] [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: 11/04/2022]
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Helbren E, Halligan S, Phillips P, Boone D, Fanshawe TR, Taylor SA, Manning D, Gale A, Altman DG, Mallett S. Towards a framework for analysis of eye-tracking studies in the three dimensional environment: a study of visual search by experienced readers of endoluminal CT colonography. Br J Radiol 2014; 87:20130614. [PMID: 24689842 PMCID: PMC4075527 DOI: 10.1259/bjr.20130614] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 01/16/2014] [Accepted: 02/17/2014] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE Eye tracking in three dimensions is novel, but established descriptors derived from two-dimensional (2D) studies are not transferable. We aimed to develop metrics suitable for statistical comparison of eye-tracking data obtained from readers of three-dimensional (3D) "virtual" medical imaging, using CT colonography (CTC) as a typical example. METHODS Ten experienced radiologists were eye tracked while observing eight 3D endoluminal CTC videos. Subsequently, we developed metrics that described their visual search patterns based on concepts derived from 2D gaze studies. Statistical methods were developed to allow analysis of the metrics. RESULTS Eye tracking was possible for all readers. Visual dwell on the moving region of interest (ROI) was defined as pursuit of the moving object across multiple frames. Using this concept of pursuit, five categories of metrics were defined that allowed characterization of reader gaze behaviour. These were time to first pursuit, identification and assessment time, pursuit duration, ROI size and pursuit frequency. Additional subcategories allowed us to further characterize visual search between readers in the test population. CONCLUSION We propose metrics for the characterization of visual search of 3D moving medical images. These metrics can be used to compare readers' visual search patterns and provide a reproducible framework for the analysis of gaze tracking in the 3D environment. ADVANCES IN KNOWLEDGE This article describes a novel set of metrics that can be used to describe gaze behaviour when eye tracking readers during interpretation of 3D medical images. These metrics build on those established for 2D eye tracking and are applicable to increasingly common 3D medical image displays.
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Affiliation(s)
- E Helbren
- Centre for Medical Imaging, University College London, London, UK
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Roberts DT, Mallett S, Krück NC, Loh W, Tibbetts I. Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment. J Fish Biol 2014; 84:163-177. [PMID: 24383803 DOI: 10.1111/jfb.12264] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 09/24/2013] [Indexed: 06/03/2023]
Abstract
This study assessed the spawning activity of the threatened Australian lungfish Neoceratodus forsteri by measuring egg densities within the artificial habitat of a large impoundment (Lake Wivenhoe, Australia). Eggs were sampled (August to November 2009) from multiple locations across the impoundment, but occurred at highest densities in water shallower than 40 cm along shorelines with a dense cover of submerged terrestrial vegetation. The numbers of eggs declined over the study period and all samples were dominated by early developmental stages and high proportions of unviable eggs. The quality of the littoral spawning habitats declined over the study as flooded terrestrial grasses decomposed and filamentous algae coverage increased. Water temperatures at the spawning site exhibited extreme variations, ranging over 20·4° C in water shallower than 5 cm. Dissolved oxygen concentrations regularly declined to <1 mg l⁻¹ at 40 and 80 cm water depth. Spawning habitats utilised by N. forsteri within impoundments expose embryos to increased risk of desiccation or excessive submergence through water-level variations, and extremes in temperature and dissolved oxygen concentration that present numerous challenges for successful spawning and recruitment of N. forsteri in large impoundment environments.
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Affiliation(s)
- D T Roberts
- Queensland Bulk Water Supply Authority (Seqwater), Brisbane, Queensland 4000, Australia
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Kaur J, Jones N, Mallett S. Thrombelastography Platelet Mapping is a useful preoperative tool in surgical patients taking antiplatelet medication. Br J Anaesth 2009; 103:304; author reply 304-5. [PMID: 19596760 DOI: 10.1093/bja/aep184] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Senzolo M, Cholongitas E, Thalheimer U, Riddell A, Agarwal S, Mallett S, Ferronato C, Burroughs AK. Heparin-like effect in liver disease and liver transplantation. Clin Liver Dis 2009; 13:43-53. [PMID: 19150308 DOI: 10.1016/j.cld.2008.09.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Liver cirrhosis is characterized by impairment of primary and secondary hemostasis but it is not clear how this impairment is related to the bleeding problems seen in cirrhosis. This delicate hemostatic balance can be perturbed by numerous conditions, such as variceal bleeding, renal failure, or infection/sepsis, which may lead to worsening of coagulation status to date. The role of endogenous heparinoids (glycosaminoglycans) in the coagulopathy of patients who have cirrhosis has been demonstrated by thromboelastography with the addition of heparinase I in patients who have recent variceal bleeding and infection. The heparin-like effect has also been demonstrated to be part of the coagulopathy seen after reperfusion in patients who have cirrhosis and are undergoing liver transplant. Therapeutic implications of these findings are not clear at the moment and the use of drugs able to cleave heparinoids should be explored.
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Affiliation(s)
- M Senzolo
- Division of Gastroenterology, Department of Surgical and Gastroenterological Sciences, University Hospital of Padua, Via Giustiniani 2, 35136, Padova, Italy
| | - E Cholongitas
- The Royal Free Sheila Sherlock Liver Centre and Department of Surgery, Royal Free Hospital, Pond Street, London NW3 2QG, UK
| | - U Thalheimer
- The Royal Free Sheila Sherlock Liver Centre and Department of Surgery, Royal Free Hospital, Pond Street, London NW3 2QG, UK
| | - Anne Riddell
- Department of Heamophilia and Haemostasis, Royal Free Hospital, Pond Street, London NW3 2QG, UK
| | - S Agarwal
- Department of Anesthesia, Royal Free Hospital, Pond Street, London NW3 2QG, UK
| | - S Mallett
- Department of Anesthesia, Royal Free Hospital, Pond Street, London NW3 2QG, UK
| | - C Ferronato
- Division of Gastroenterology, Department of Surgical and Gastroenterological Sciences, University Hospital of Padua, Via Giustiniani 2, 35136, Padova, Italy
| | - A K Burroughs
- The Royal Free Sheila Sherlock Liver Centre and Department of Surgery, Royal Free Hospital, Pond Street, London NW3 2QG, UK.
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Mallett S. How many Cochrane reviews are needed to cover existing evidence on the effects of healthcare interventions? ACTA ACUST UNITED AC 2003. [DOI: 10.1136/ebm.8.4.100] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Gregg C, Mallett S. Who answers the medical necessity question? J AHIMA 2000; 71:50-3; quiz 55-6. [PMID: 11010095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Affiliation(s)
- C Gregg
- HIM Program, Cincinnati State Technical and Community College, OH, USA.
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Seifalian AM, Mallett S, Piasecki C, Rolles K, Davidson BR. Non-invasive measurement of hepatic oxygenation by an oxygen electrode in human orthotopic liver transplantation. Med Eng Phys 2000; 22:371-7. [PMID: 11121770 DOI: 10.1016/s1350-4533(00)00060-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Precise evaluation of graft reperfusion is difficult in clinical liver transplantation. The oxygen electrode (OE) is a novel technique to detect blood flow indirectly by measuring the quantity of oxygen which can diffuse from the hepatic tissue to the surface electrode. Application of the surface OE does not influence the liver blood flow or parenchymal perfusion. Adequate graft oxygenation is essential to the outcome of organ transplantation and has not previously been analysed intra-operatively in liver transplant recipients. The OE was applied to the surface of the graft intra-operatively in 22 human liver grafts after restoring portal vein and hepatic artery inflow. OE readings were compared with liver blood flow using an electromagnetic flowmeter (EMF). Intra-operative haemodynamics and donor organ parameters known to influence graft function were correlated with the OE readings. There was a significant correlation (r=0.89; p<0.001, n=14) between tissue oxygenation using the OE and total liver blood flow measured by EMF. The tissue oxygenation measurements were reproducible with a coefficient of variation of 5%. The hepatic tissue oxygenation increased significantly from baseline following venous reperfusion of the graft (282+/-23 vs 3107+/-288 (+/-SE) nA, p<0.001). Hepatic arterial revascularisation resulted in a significant (p<0.001) increase of 41+/-7% in liver oxygen perfusion. There was significant negative correlation (r=0.80, p<0.001, n=22) between cold ischaemic time and graft tissue oxygenation. The OE provides a reliable, cheap and non-invasive method of monitoring liver graft oxygenation and perfusion during transplantation.
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Affiliation(s)
- A M Seifalian
- University Department of Surgery and Liver Transplantation, Royal Free and University College Medical School, University College London and The Royal Free Hospital, Pond Street, London NW3 2QG, UK.
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Mallett S, Smith GI. Sign of the changing times: CPT 1999. J AHIMA 1999; 70:70-2; quiz 75-6. [PMID: 10537630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Although CPT 1999 contains fewer changes than in past years, coders should take some time to learn them by: familiarizing themselves with the new symbols + and [symbol: see text] reviewing Appendix A for a complete list of modifiers as well as modifiers used in the ambulatory surgery center hospital outpatient setting; reviewing Appendix E for a complete list of add-on codes; reviewing Appendix F for a list of modifier-51-exempt codes; consulting the excludes note found above code 69,990 to identify procedures exempt from the use of the new operating microscope code; examining the specific codes used to identify bronchoscopic procedures; reviewing the parenthetical notes found after code 15,001, directing the coder to also assign the appropriate code for lesion excision; reviewing the changes associated with the coding of destruction of lesions understanding the changes in immunization code assignment; consulting payers for specific reimbursement guidelines.
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Affiliation(s)
- S Mallett
- Cincinnati State Technical and Community College, OH, USA
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Al-Shamkhani A, Mallett S, Brown MH, James W, Barclay AN. Affinity and kinetics of the interaction between soluble trimeric OX40 ligand, a member of the tumor necrosis factor superfamily, and its receptor OX40 on activated T cells. J Biol Chem 1997; 272:5275-82. [PMID: 9030600 DOI: 10.1074/jbc.272.8.5275] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
OX40 ligand (OX40L) and OX40 are members of the tumor necrosis factor and tumor necrosis factor receptor superfamilies, respectively. OX40L is expressed on activated B and T cells and endothelial cell lines, whereas OX40 is expressed on activated T cells. A construct for mouse OX40L was expressed as a soluble protein with domains 3 and 4 of rat CD4 as a tag (sCD4-OX40L). It formed a homotrimer as assessed by chemical cross-linking and gel filtration chromatography. Radiolabeled sCD4-OX40L bound to activated mouse T cells with a high affinity (KD = 0.2-0.4 nM) and dissociated slowly (koff = 4 x 10(-5) s-1). The affinity and kinetics of the OX40L/OX40 interactions were studied using the BIAcoreTM biosensor, which measures macromolecular interactions in real time. The extracellular part of the OX40 antigen was expressed as a soluble monomeric protein and immobilized on the BIAcore sensor chip. sCD4-OX40L bound the OX40 with a high affinity (KD = 3.8 nM), although this was lower than that determined on the surface of activated T cells (KD = 0.2-0.4 nM), where there is likely to be less restriction in mobility of the receptor. In the reverse orientation, sOX40 bound to immobilized sCD4-OX40L with a stoichiometry of 3.1 receptors to one ligand, with low affinity (KD = 190 nM) and had a relatively fast dissociation rate constant (koff = 2 x 10(-2) s-1). Thus if the OX40 receptor is cleaved by proteolysis, it will release any bound ligand and is unlikely to block re-binding of ligand to cell surface OX40 because of the low monomeric affinity.
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Affiliation(s)
- A Al-Shamkhani
- Medical Research Council Cellular Immunology Unit, University of Oxford, Oxford OX1 3RE, United Kingdom
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Mallett S, Rosen SD, Hyun W. Calcium-dependent lectin activity with novel distribution on thymocyte subsets. Eur J Immunol 1996; 26:77-83. [PMID: 8566087 DOI: 10.1002/eji.1830260112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In this study we use carbohydrate probes to search for novel cell surface lectins in the immune system. Many carbohydrate binding proteins are members of the C-type lectin superfamily, whose ligand binding is dependent on calcium. To identify potential new members of this superfamily, fluorescein-conjugated carbohydrate polymers were used to probe for calcium-dependent cell surface binding. This approach offers advantages over the use of monoclonal antibody probes since only carbohydrate binding proteins would be identified. We have identified a cell surface lectin, referred to as thy-lec, detected by the probe fucoidan-fuorescein isothiocyanate. This calcium-dependent lectin has a novel distribution on thymocyte subsets. It is present on the surface of immature CD4+8+ and on large, cycling CD4-8- cells and CD8+4- cells, but not on small, mature phenotype CD8+4- or CD4+8- thymocytes. This lectin is not found on mature T cells or other leukocytes in lymph nodes, spleen or bone marrow. It is proposed that this novel cell surface has a function in the maturation of T cells in the thymus.
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Affiliation(s)
- S Mallett
- Department of Anatomy, University of California, San Francisco, USA.
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Abstract
Conjunctival oxygen tension has been noted in animal studies to correlate with oxygen delivery. In order to assess this relationship in man, we compared the proportional changes in conjunctival oxygen tension with those in oxygen delivery that occur on the placement and release of the inferior vena caval clamps in 10 patients during orthotopic liver transplantation without veno-venous bypass. We also examined the changes in mixed venous oxygen saturation at these times. We found a statistically significant correlation between both parameters and oxygen delivery (p < 0.001). However, analysing the data on a Bland and Altman plot of difference versus mean, it is our conclusion that the variation in the data is such that neither conjunctival oxygen tension nor mixed venous oxygen saturation can be used clinically to predict the changes in oxygen delivery that occur during liver transplantation.
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Affiliation(s)
- R Alcock
- Department of Anaesthetics, Royal Free Hospital, London
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30
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Hamilton MI, Alcock R, Magos AL, Mallett S, Rolles K, Burroughs AK. Liver transplantation during pregnancy. Transplant Proc 1993; 25:2967-8. [PMID: 8212297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We present a case of successful liver transplantation during the midtrimester of pregnancy, showing that pregnancy itself is not a contraindication to liver transplantation with life-threatening illness. Improvements in anaesthetic and surgical technique will enhance the possibility of foetal survival.
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Affiliation(s)
- M I Hamilton
- Department of Medicine, Royal Free Hospital, London, England
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31
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Smith O, Hazlehurst G, Brozovic B, Rolles K, Burroughs A, Mallett S, Dawson K, Mehta A. Impact of aprotinin on blood transfusion requirements in liver transplantation. Transfus Med 1993; 3:97-102. [PMID: 7690641 DOI: 10.1111/j.1365-3148.1993.tb00046.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A retrospective study was carried out to ascertain the blood bank provision required to support a liver transplant programme and to assess the effect of intraoperative aprotinin on blood product requirements in liver transplant recipients with cirrhosis. Sixty patients with end-stage liver disease underwent 62 consecutive orthotopic liver transplants between October 1988 and January 1991. The total and intraoperative requirements of red cells, platelets and fresh frozen plasma (FFP) were analysed for three groups of liver transplant recipients, those without cirrhosis (n = 15), those with cirrhosis (n = 25) and those with cirrhosis who received intraoperative aprotinin (n = 20). Fifteen without cirrhosis had mean total requirements of 15 units of red cells, 18 units of platelets and 16 units of FFP. Twenty patients with cirrhosis who received intraoperative aprotinin had broadly similar requirements. However, blood product requirements for 25 patients with cirrhosis were significantly greater (46 units of red cells, 41 units of platelets, 43 units of FFP, excluding the seven patients with primary biliary cirrhosis). We conclude that a liver transplant programme can be supported by a teaching hospital blood bank. The use of intraoperative aprotinin significantly reduces blood product requirements.
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Affiliation(s)
- O Smith
- Department of Haematology, Royal Free Hospital and School of Medicine, London, U.K
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32
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Coulter J, Molloy RG, Moran KT, Waldron R, Kirwan WO, O’Suilleabhain C, Horgan A, Mealy K, Burke P, Hyland J, Horgan AF, Sheehan M, Browne RM, Austin O, Clery AP, Deasy JM, Sulaiman-Shoaib S, Soeda J, O’Briain DS, Puri P, Coveney EC, McAllister V, McDermott EWM, O’Higgins NJ, Maher M, Caldwell MTP, Murchan P, Beesley W, Feeley TM, Tanner WA, Keane FBV, Abbasakoor F, Attwood SEA, McGrath LP, Stephens RB, O’Broin E, Davies MG, McGinley J, Mannion C, Gupta S, Shine MF, Lennon F, Ninan G, Fitzgerald RJ, Guiney EJ, O’Donnell B, O’Donnell AF, Luke D, Wood AE, Murphy PG, Walsh TN, Hill ADK, Li H, Hennessy TPJ, Noonan N, Breslin B, Keeling PWN, Curran AJ, Gough DB, Davidson IR, Keeling P, O’Leary DP, Smythe A, Bird NC, Johnson AG, Nicholson P, Traynor O, Dawson K, Aitken J, Cooke BA, Parbhoo SP, N.Williams N, Daly JM, Herlyn M, Bouchier-Hayes D, Stuart RC, Allen MJ, Thompson WD, Peel ALG, Hehir DT, Cronin K, McCann A, Dervan PA, Heffernan SJ, Hederman WP, Galea MH, Dilks B, Gilmour A, Ellis LO, Elston CW, Blarney RW, O’Rourke S, Mookens A, Carter R, Parkin D, Couse NF, Delaney CP, Horgan PG, Fitzpatrick JM, Gorey TF, O’Byrne JM, McCabe JP, Stephens M, McManus F, L.Mangan J, Barr DA, Mulvenna GJ, Maginn P, Kernohan WG, Mollan RAB, O’Flanagan SJ, Stack JP, Dervan P, Hurson B, Tierney S, Fitzgerald P, O’Sullivan T, Grace P, Wyatt JP, Evans RJ, Cusack SP, McGowan S, McGovem E, Schwaitzberg SD, Connolly RJ, Sullivan RP, Mortimer G, Geraghty JG, O’Dwyer PJ, McGlone BS, O’Brien DP, Younis HA, Given HF, Phelan C, Byrne J, Barry K, Gough D, Hanrahan L, Given F, Sweeney JP, Korebrits AM, Reynolds JV, Gorey TF, O’Hanlon DM, Stokes MA, Redmond HP, McCarthy J, Daly JM, Losty P, Murphy M, Butler PEM, Grace PG, Novell JR, Hobbs SK, Smith O, Hazlehurst G, Brozovic B, Rolles K, Burroughs A, Mallett S, Mehta A, Buckley D, Waldron D, O’Brien D, Curran C, Given F, Grey L, Leahy A, Darzi A, Leader D, Broe P, Geoghegan JG, Cheng CA, Lawson DC, Pappas TN, O’Sullivan D, Lieber MM, Colby TV, Barrett DM, Rogers E, Greally J, Bredin HC, Corcoran MO, Kenny M, Horgan P, Headon D, Grace A, Grace PA, Bouchier-Hayes D, Cross S, Hehir D, O’Briain S, Hartigan P, Colgan MP, Moore D, Shanik G, Zaidi SZ, Hehir DJ, Cross KS, Colgan MP, Moore DJ, Shanik DG, Lacy P, Cross S, Hehir D, Moore D, Shanik G, Coleman JE, McEnroe CS, Gelfand JA, O’Donnell TF, Callow AD, Buckley DJ, O’Riordain DS, O’Donnell JA, Meagher P, Boos K, Gillen P, Corrigan T, Vashisht R, Sian M, Sharp EJ, O’Malley MK, Kerin MJ, Wilkinson D, Parkin A, Kester RC, Maher MM, Waldron RP, Waldron DJ, Brady MP, Allen M, Lyncy TH, Waymont B, Emtage L, Blackledge GR, Hughes MA, Wallace DMA, O’Sullivan D, Mynderse L, Barrett DM, Rogers E, Grimes H, Chambers F, Lowe D, Bredin HC, Corcoran MO, Waldron DJ, Prasad B, O’Sullivan DC, Gillen MBP, McNicholas M, Traynor O, Bredin H, O’Dowd TH, Corcoran M, O’Donoghue JM, Corcoran M, McGuire M, McNamara A, Creagh T, Grainger R, McDermott TBD, Butler MR, Gleeson M, Creagh T, Grainger R, McDermott TED, Hurley JP, Hone R, Neligan M, Hurley J, White M, McDonagh P, Phelan D, McGovern E, Quinn F, Breatnach F, O’Meara A, McGrath JP, McCann SR, Gaffney EF, Hennessy A, Leader M, Taleb FS, McKiernan MV, Leyden PJ, McCann JJ, Coleman J, Quereshi A, Ajayi N, McEntee G, Osborne H, Bouchier-Hayes DJ, Johnston S, O’Malley K, Smyth E, Bouchier-Hayes DL, Darzi A, Quereshi A, McEntee G, O’Connell PR, Gorey T, McAnena OJ, Reed MW, Duncan JL, Reilly CS, McGibney C, Lawlor P, Lawless B, McGuinness E, Leahy S. Sixteenth sir peter freyer memorial lecture and surgical symposium September 13th & 14th, 1991 Session I. Ir J Med Sci 1992. [DOI: 10.1007/bf02942125] [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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Abstract
In this article Susan Mallett and Neil Barclay discuss the molecular and functional features of a new superfamily of membrane proteins defined by the presence of cysteine-rich motifs originally identified in the low-affinity nerve growth factor receptor. This superfamily includes two lymphocyte proteins of unknown function and two receptors for tumor necrosis factor.
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Affiliation(s)
- S Mallett
- MRC Cellular Immunology Unit, Sir William Dunn School of Pathology, University of Oxford, UK
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Mallett S, Rolles K, Cox D, Burroughs A, Hunt B. Intraoperative use of aprotinin (Trasylol) in orthotopic liver transplantation. Transplant Proc 1991; 23:1931-2. [PMID: 1712134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- S Mallett
- Department of Anaesthesia and Hepatobiliary, Royal Free Hospital, London, England
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35
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Abstract
The MRC OX-47 monoclonal antibody recognizes a membrane antigen present at low levels on many lymphocytes but whose expression is markedly increased on activation with mitogens. cDNA clones for the OX-47 antigen were isolated from an expression library and the protein sequence deduced. It contains a leader sequence giving a mature protein of 251 amino acids with a single putative transmembrane region, a cytoplasmic domain of 40 amino acids and an extracellular domain of 187 amino acids that contained two immunoglobulin-like domains. The putative transmembrane sequence includes a glutamic acid residue within the hydrophobic sequence. The presence of acidic residues within the hydrophobic sequence of transmembrane sequences usually indicates association with other polypeptides and this is predicted for the OX-47 antigen. A sequence of 37 amino acids that included all the transmembrane region was identical to that of the chicken HT7 antigen present on endothelium in brain and erythroblasts. The level of protein sequence identity in the Ig-like domains was lower but HT7 is almost certainly the chicken homologue of the rat OX-47 antigen. The ligand and function of the molecule are unknown. In addition to lymphoblasts the OX-47 antigen was localized on a variety of other cell types including various immature cells, endothelia and cells with excitable membranes.
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Affiliation(s)
- S Fossum
- MRC Cellular Immunology Unit, Sir William Dunn School of Pathology, University of Oxford, GB
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36
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Mallett S, Fossum S, Barclay AN. Characterization of the MRC OX40 antigen of activated CD4 positive T lymphocytes--a molecule related to nerve growth factor receptor. EMBO J 1990; 9:1063-8. [PMID: 2157591 PMCID: PMC551780 DOI: 10.1002/j.1460-2075.1990.tb08211.x] [Citation(s) in RCA: 267] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The antigen recognized by the monoclonal antibody (mAb) MRC OX40 is present on activated rat CD4 positive T lymphocytes but not other cells. cDNA clones were isolated from an expression library using the MRC OX40 mAb and the protein sequence for the OX40 antigen deduced. It contains a typical signal sequence and a single putative transmembrane sequence of 25 predominantly hydrophobic amino acids giving an extracellular domain of 191 amino acids and a cytoplasmic domain of 36 amino acids. The sequence of the extracellular domain includes a cysteine-rich region with sequence similarities with the low affinity nerve growth factor receptor (NGFR) of neurons and the CD40 antigen present on human B cells. Within this region three cysteine-rich motifs can be recognized in OX40 compared with four similar motifs in both NGFR and CD40. OX40, CD40 and NGFR constitute a new superfamily of molecules with expression including lymphoid cells (OX40, CD40) and neuronal cells (NGFR). This is reminiscent of the immunoglobulin superfamily whose molecules are variously found at the surface of lymphoid or brain cells or both.
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Affiliation(s)
- S Mallett
- MRC Cellular Immunology Unit, Sir William Dunn School of Pathology, University of Oxford, UK
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Mallett S, Virji MA, DeWolf AM, Kang YG, Aggarwal S, Freeman JA, Seifert R. Hormonal control of glucose metabolism during liver transplantation. Transplant Proc 1989; 21:3529. [PMID: 2662512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- S Mallett
- Department of Anesthesiology, University of Pittsburgh School of Medicine, PA 15261
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38
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Mallett S. Impressions in Plaster of Paris. Dent Regist 1855; 8:115-118. [PMID: 33695091 PMCID: PMC6876735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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