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Tso S, Moiz H, Satchwell F, Hari T, Dhariwal S, Barlow R, Forbat E, Blee IC, Tan YT, Thind C, Ilchyshyn A, Randeva H, Kwok MM, Tso ACY, Barber TM. Erythroderma (exfoliative dermatitis). Part 2: energy homeostasis and dietetic management strategies. Clin Exp Dermatol 2021; 46:1011-1015. [PMID: 33817816 DOI: 10.1111/ced.14667] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 03/26/2021] [Accepted: 03/30/2021] [Indexed: 11/28/2022]
Abstract
Erythroderma (exfoliative dermatitis) is associated with important metabolic changes that include an enhancement in energy expenditure. The key components to total energy expenditure (TEE) include basal metabolic rate (~68% of TEE), physical activity (~22% of TEE) and thermic effect of food (~10% of TEE). In the erythrodermic state, there are likely multiple contributors to the increase in basal metabolic rate, such as 'caloric drain' resulting from increased evaporation of water from enhanced transepidermal water loss, increased activity of the cardiovascular system (including high-output cardiac failure), increased nonshivering thermogenesis and hormonal changes such as hypercortisolaemia. A change in the patient's level of physical activity and appetite as a result of ill health status may further impact on their TEE and energy consumption. In Part 2 of this two-part concise review, we explore the key constituents of energy homeostasis and the potential mechanisms influencing energy homeostasis in erythroderma, and suggest much-needed dietetic management strategies for this important condition.
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Affiliation(s)
- S Tso
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - H Moiz
- Department of Public Health, University of Warwick, Coventry, UK
| | - F Satchwell
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - T Hari
- University of Buckingham Medical School, Buckingham, UK
| | - S Dhariwal
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - R Barlow
- Department of Dermatology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - E Forbat
- Department of Dermatology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - I C Blee
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK.,Centre for Host Microbiome Interactions King's College London, London, UK
| | - Y T Tan
- Department of Cardiology, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - C Thind
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - A Ilchyshyn
- Department of Dermatology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - H Randeva
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.,Warwick Medical School, University of Warwick, Warwick, UK
| | - M M Kwok
- Department of Anesthetics, Westmead Hospital, Sydney, NSW, Australia
| | - A C Y Tso
- Department of Haematology, Tan Tock Seng Hospital, Singapore, Singapore
| | - T M Barber
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.,Warwick Medical School, University of Warwick, Warwick, UK
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Tso S, Satchwell F, Moiz H, Hari T, Dhariwal S, Barlow R, Forbat E, Randeva H, Tan YT, Ilchyshyn A, Kwok MM, Barber TM, Thind C, Tso ACY. Erythroderma (exfoliative dermatitis). Part 1: underlying causes, clinical presentation and pathogenesis. Clin Exp Dermatol 2021; 46:1001-1010. [PMID: 33639006 DOI: 10.1111/ced.14625] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/22/2021] [Accepted: 02/22/2021] [Indexed: 12/25/2022]
Abstract
Erythroderma (exfoliative dermatitis), first described by Von Hebra in 1868, manifests as a cutaneous inflammatory state, with associated skin barrier and metabolic dysfunctions. The annual incidence of erythroderma is estimated to be 1-2 per 100 000 population in Europe with a male preponderance. Erythroderma may present at birth, or may develop acutely or insidiously (due to progression of an underlying primary pathology, including malignancy). Although there is a broad range of diseases that associate with erythroderma, the vast majority of cases result from pre-existing and chronic dermatoses. In the first part of this two-part concise review, we explore the underlying causes, clinical presentation, pathogenesis and investigation of erythroderma, and suggest potential treatment targets for erythroderma with unknown causes.
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Affiliation(s)
- S Tso
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - F Satchwell
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - H Moiz
- Department of Public Health, University of Warwick, Coventry, UK
| | - T Hari
- University of Buckingham Medical School, Buckingham, UK
| | - S Dhariwal
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - R Barlow
- Department of Dermatology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - E Forbat
- Department of Dermatology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.,Department of Dermatology, Worcestershire Acute Hospitals NHS Trust, Worcester, UK
| | - H Randeva
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.,Warwick Medical School, University of Warwick, Coventry, UK
| | - Y T Tan
- Department of Cardiology, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - A Ilchyshyn
- Department of Dermatology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - M M Kwok
- Anaesthetics, Westmead Hospital, Sydney, Australia
| | - T M Barber
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.,Warwick Medical School, University of Warwick, Coventry, UK
| | - C Thind
- Jephson Dermatology Centre, South Warwickshire NHS Foundation Trust, Warwick, UK
| | - A C Y Tso
- Department of Haematology, Tan Tock Seng Hospital, Singapore, Singapore
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Carter F, Davies J, Barlow R, Francis N, McDonald D, Grocott M. Prehabilitation in the UK: Outcomes of a national survey. Clin Nutr ESPEN 2019. [DOI: 10.1016/j.clnesp.2019.03.061] [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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Amin T, Infantino A, Barlow R, Hoehr C. Validating production of PET radionuclides in solid and liquid targets: Comparing Geant4 predictions with FLUKA and measurements. Appl Radiat Isot 2018; 133:61-67. [PMID: 29289812 DOI: 10.1016/j.apradiso.2017.12.009] [Citation(s) in RCA: 7] [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: 09/18/2017] [Revised: 11/22/2017] [Accepted: 12/08/2017] [Indexed: 12/12/2022]
Abstract
The Monte Carlo toolkit Geant4 is used to simulate the production of a number of positron emitting radionuclides: 13N, 18F, 44Sc, 52Mn, 55Co 61Cu, 68Ga, 86Y, 89Zr and 94Tc, which have been produced using a 13MeV medical cyclotron. The results are compared to previous simulations with the Monte Carlo code FLUKA and experimental measurements. The comparison shows variable degrees of agreement for different isotopes. The mean absolute deviation of Monte Carlo results from experiments was 1.4±1.6 for FLUKA and 0.7±0.5 for Geant4 using TENDL cross sections with QGSP-BIC-AllHP physics. Both agree well within the large error, which is due to the uncertainties present in both experimentally determined and theoretical reaction cross sections. Overall, Geant4 has been confirmed as a tool to simulate radionuclide production at low proton energy.
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Affiliation(s)
- T Amin
- University of Huddersfield, Huddersfield HD1 3DH, UK
| | - A Infantino
- European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - R Barlow
- University of Huddersfield, Huddersfield HD1 3DH, UK
| | - C Hoehr
- TRIUMF, Vancouver BC V6T 2A3, Canada.
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Barlow R, Lewis W, Williams S, Green J. The integration of nutrition into the curriculum on medical education in Cardiff University. Clin Nutr ESPEN 2017. [DOI: 10.1016/j.clnesp.2017.07.049] [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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Gregory J, Barlow R, McGee U, Cole H, Edwards S, Howell G, Lewis W. Incidence and recognition of malnutrition on admission to hospital. Clin Nutr ESPEN 2017. [DOI: 10.1016/j.clnesp.2017.07.051] [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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7
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Edwards S, Barlow R, Cole H, Gregory J, McGee U. Does age, gender, smoking and alcohol intake influence nutritional status on admission to an acute hospital? Clin Nutr ESPEN 2017. [DOI: 10.1016/j.clnesp.2017.07.052] [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: 11/28/2022]
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Cole H, Barlow R, Edwards S, Gregory J, McGee U, Howell G, Lewis W. Impact of nutritional status on length of hospital stay. Clin Nutr ESPEN 2017. [DOI: 10.1016/j.clnesp.2017.07.054] [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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9
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Chirvase C, Teo K, Barlow R, Bentefour E. PO-0802: Experimental validation of single detector proton radiography with scanning beams. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31239-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Guthrie K, Barlow R, Kush JS. Restoring an Ecosystem with Silvopasture: A Short(leaf) Story. ECOL RESTOR 2016. [DOI: 10.3368/er.34.1.16] [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: 11/03/2022]
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11
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Amin T, Lindsay C, Hoehr C, Barlow R. PET scanning of ocular melanoma after proton irradiation. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)30007-x] [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: 10/22/2022]
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Kai A, Richards T, Coleman A, Mallipeddi R, Barlow R, Craythorne E. Five‐year recurrence rate of lentigo maligna after treatment with imiquimod. Br J Dermatol 2015; 174:165-8. [DOI: 10.1111/bjd.14311] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/23/2015] [Indexed: 11/30/2022]
Affiliation(s)
- A.C. Kai
- Dermatological Surgery and Laser Unit St John's Institute of Dermatology Guy's and St Thomas’ NHS Foundation Trust 3rd Floor, Staircase C Westminster Bridge Road London SE1 7EH U.K
| | - T. Richards
- Department of Biomedical Engineering Kings College London London U.K
| | - A. Coleman
- Department of Biomedical Engineering Kings College London London U.K
| | - R. Mallipeddi
- Dermatological Surgery and Laser Unit St John's Institute of Dermatology Guy's and St Thomas’ NHS Foundation Trust 3rd Floor, Staircase C Westminster Bridge Road London SE1 7EH U.K
| | - R. Barlow
- Dermatological Surgery and Laser Unit St John's Institute of Dermatology Guy's and St Thomas’ NHS Foundation Trust 3rd Floor, Staircase C Westminster Bridge Road London SE1 7EH U.K
| | - E.E. Craythorne
- Dermatological Surgery and Laser Unit St John's Institute of Dermatology Guy's and St Thomas’ NHS Foundation Trust 3rd Floor, Staircase C Westminster Bridge Road London SE1 7EH U.K
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Jongepier L, Barlow R. P117 Pulmonary Rehabilitation In The East Of England - 2.5-fold Variation In Completion Rates. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.258] [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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Barlow R, Easton I, Andrews L. P116 Differences In Patient Outcomes Between A 6, 7 And 8 Week Pulmonary Rehabilitation Programme. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.257] [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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Jongepier L, Barlow R. P115 Evidence Of Post-code Lottery In The Availability Of Pulmonary Rehabilitation (pr) In The East Of England (eoe). Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.256] [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: 11/03/2022]
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16
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Toader A, Barlow R, Edgecock R. 195: PIP: a compact recirculating accelerator for the production of medical isotopes. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)34216-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Bungau A, Adelmann A, Alonso JR, Barletta W, Barlow R, Bartoszek L, Calabretta L, Calanna A, Campo D, Conrad JM, Djurcic Z, Kamyshkov Y, Shaevitz MH, Shimizu I, Smidt T, Spitz J, Wascko M, Winslow LA, Yang JJ. Proposal for an electron antineutrino disappearance search using high-rate 8Li production and decay. Phys Rev Lett 2012; 109:141802. [PMID: 23083237 DOI: 10.1103/physrevlett.109.141802] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Indexed: 06/01/2023]
Abstract
This paper introduces an experimental probe of the sterile neutrino with a novel, high-intensity source of electron antineutrinos from the production and subsequent decay of 8Li. When paired with an existing ∼1 kton scintillator-based detector, this <E(ν)> = 6.4 MeV source opens a wide range of possible searches for beyond standard model physics via studies of the inverse beta decay interaction ν(e) + p → e+ + n. In particular, the experimental design described here has unprecedented sensitivity to ν(e) disappearance at Δm2 ∼ 1 eV2 and features the ability to distinguish between the existence of zero, one, and two sterile neutrinos.
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Affiliation(s)
- A Bungau
- University of Huddersfield, Huddersfield HD1 3DH, United Kingdom
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Morris S, Barlow R, Selva D, Malhotra R. Allergic contact dermatitis: a case series and review for the ophthalmologist. Br J Ophthalmol 2010; 95:903-8. [DOI: 10.1136/bjo.2009.174607] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Pang J, Boye SE, Lei B, Boye SL, Everhart D, Ryals R, Umino Y, Rohrer B, Alexander J, Li J, Dai X, Li Q, Chang B, Barlow R, Hauswirth WW. Self-complementary AAV-mediated gene therapy restores cone function and prevents cone degeneration in two models of Rpe65 deficiency. Gene Ther 2010; 17:815-26. [PMID: 20237510 DOI: 10.1038/gt.2010.29] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
To test whether fast-acting, self-complimentary (sc), adeno-associated virus-mediated RPE65 expression prevents cone degeneration and/or restores cone function, we studied two mouse lines: the Rpe65-deficient rd12 mouse and the Rpe65-deficient, rhodopsin null ('that is, cone function-only') Rpe65(-/-)::Rho(-/-) mouse. scAAV5 expressing RPE65 was injected subretinally into one eye of rd12 and Rpe65(-/-)::Rho(-/-) mice at postnatal day 14 (P14). Contralateral rd12 eyes were injected later, at P35. Rd12 behavioral testing revealed that rod vision loss was prevented with either P14 or P35 treatment, whereas cone vision was only detected after P14 treatment. Consistent with this observation, P35 treatment only restored rod electroretinogram (ERG) signals, a result likely due to reduced cone densities at this time point. For Rpe65(-/-)::Rho(-/-) mice in which there is no confounding rod contribution to the ERG signal, cone cells and cone-mediated ERGs were also maintained with treatment at P14. This work establishes that a self-complimentary AAV5 vector can restore substantial visual function in two genetically distinct models of Rpe65 deficiency within 4 days of treatment. In addition, this therapy prevents cone degeneration but only if administered before extensive cone degeneration, thus supporting continuation of current Leber's congenital amaurosis-2 clinical trials with an added emphasis on cone subtype analysis and early intervention.
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Affiliation(s)
- J Pang
- Department of Ophthalmology and Powell Gene Therapy Center, University of Florida, Gainesville, FL 32610, USA.
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Barlow R, Khan M, Farell B. Time of day and glucose modulate visual sensitivity. J Vis 2010. [DOI: 10.1167/3.9.356] [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: 11/24/2022] Open
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21
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Walter K, Cockerill PN, Barlow R, Clarke D, Hoogenkamp M, Follows GA, Richards SJ, Cullen MJ, Bonifer C, Tagoh H. Aberrant expression of CD19 in AML with t(8;21) involves a poised chromatin structure and PAX5. Oncogene 2010; 29:2927-37. [DOI: 10.1038/onc.2010.56] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Abstract
AIMS This study was carried out to determine the prevalence and serotype of Salmonella in goats presented for slaughter. METHODS AND RESULTS A total of 121 goats were examined for the presence of Salmonella in matching rumen, faecal and carcass samples. Samples were analysed for the presence of Salmonella following the Australian Standard AS 1766.2.5-1991. Salmonella was isolated from 56 (46.3%) faecal samples, 55 (45.5%) rumen samples and 35 (28.9%) carcass samples. The dominant serotypes isolated were Salmonella serotype Saintpaul (31%), Salmonella serotype Typhimurium (13%) and Salmonella serotype Chester (11%). CONCLUSIONS Salmonella was isolated from at least one of the three sample sites in 68% of animals. Carcase contamination with faeces, compared with rumen liquor, is a greater hazard for Salmonella contamination of goat carcases. Goat meat is a potential source of Salmonella serovars associated with human disease. SIGNIFICANCE AND IMPACT OF THE STUDY Goat carcases contaminated with Salmonella during slaughter could be a source of food-borne disease if consumed raw or inadequately cooked, or may be a source of cross-contamination to other foods.
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Affiliation(s)
- L Duffy
- Food Science Australia, Tingalpa DC, Queensland, Australia.
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McDonnell C, Barlow R, Campisi P, Grant R, Malkin D. Fatal peri-operative acute tumour lysis syndrome precipitated by dexamethasone. Anaesthesia 2008; 63:652-5. [DOI: 10.1111/j.1365-2044.2007.05436.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [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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24
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Rohan D, Barlow R, Karsli C, Ames W. Paediatric renal transplantation: a single centre study. Eur J Anaesthesiol 2006; 24:93-5. [PMID: 17038216 DOI: 10.1017/s0265021506001748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/15/2006] [Indexed: 11/05/2022]
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Abstract
The purpose of the study is to describe linear basal cell carcinoma (BCC) as a distinct clinical entity, and highlight its existence to the plastic surgery literature. A Medline and PubMed literature search was conducted, and 33 reported cases of linear BCC were analysed. Of these 33 cases, the most common site for linear BCC was the periocular region, accounting for 49% (n= 16). The most common histologic subtype, was nodular BCC, accounting for 50% (n= 17). Of the 33 reported cases the postoperative defect size was mentioned in five cases only. None of these would have been completely excised if a 2 mm margin was applied, and only one out of five if a 4 mm margin was applied. Linear BCC is a distinct clinical entity. Presence of the tumour along relaxing skin tension lines, increase in subclinical extension, and aggressive tumour behavior are reported observations. Because of these observations it is suggested that margin-controlled excision should be considered for linear BCC.
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Affiliation(s)
- I Mavrikakis
- Corneo Plastic Unit, The Queen Victoria Hospital, Holtye Road, East Grinstead, RH19 3DZ, UK
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Brown ET, Umino Y, Loi T, Solessio E, Barlow R. Anesthesia can cause sustained hyperglycemia in C57/BL6J mice. Vis Neurosci 2005; 22:615-8. [PMID: 16332272 DOI: 10.1017/s0952523805225105] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [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: 02/21/2005] [Accepted: 05/18/2005] [Indexed: 11/05/2022]
Abstract
Effects of anesthesia on the blood glucose of C57/BL6J mice were evaluated under conditions commonly used for testing retinal sensitivity with electroretinographic (ERG) recordings. We evaluated the effects of four anesthetics: nembutal (50 mg/kg), pentothal (100 mg/kg), avertin (240 mg/kg), and ketamine/xylazine (100 mg/kg) using saline as control. We measured blood glucose (BG) levels from tail vein blood before and 15 and 60 min following intraperitoneal injections. Fifteen minutes postinjection, all four anesthetics and saline elevated BG with ketamine/xylazine and avertin having substantially greater effects than nembutal, pentothal, and saline. Only the effects of ketamine/xylazine and avertin persisted throughout the test period. Sixty minutes after injecting ketamine/xylazine BG remained elevated at 400 +/- 42 mg/dl, a 167% increase over preinjection levels. Sixty minutes after injecting avertin BG was 288 +/- 10 mg/dl, a 59% increase over preinjection levels. No sustained elevation in BG was detected 60 min following injection of nembutal, pentothal, or saline. Because BG can affect the amplitude of the ERG, caution should be exercised in the use of ketamine/xylazine or avertin. The choice of anesthesia may also be important in diabetes and metabolism research where changes in blood glucose could impact physiological processes.
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Affiliation(s)
- E T Brown
- Center for Vision Research, SUNY Upstate Medical University, Syracuse, NY 13210, USA
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28
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Barlow R, Holloway C, Lutin W. 412 SCREENING FOR CONGENITAL HEART DISEASE IN THE NEWBORN NURSERY. J Investig Med 2005. [DOI: 10.2310/6650.2005.00006.411] [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: 11/18/2022]
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29
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Smith JH, Karsli C, Lagacé A, Luginbuehl I, Barlow R, Bissonnette B. Cerebral blood flow velocity increases when propofol is changed to desflurane, but not when isoflurane is changed to desflurane in children. Acta Anaesthesiol Scand 2005; 49:23-7. [PMID: 15675977 DOI: 10.1111/j.1399-6576.2004.00535.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Children may exhibit delayed emergence following maintenance of anesthesia with propofol or isoflurane. Desflurane is often used towards the end of procedures to facilitate emergence. This study evaluated the effect on middle cerebral artery blood flow velocity (Vmca) in anesthetized children when propofol or isoflurane was substituted with desflurane. METHODS Forty-two healthy children aged 1-6 years were enrolled. A standardized anesthetic induction was used. Anesthesia was maintained with remifentanil (0.5 microg.kg(-1) bolus followed by an infusion of 0.2 microg.kg(-1).min(-1)) and a randomly selected sequence of propofol/desflurane/propofol, desflurane/propofol/desflurane, isoflurane/desflurane/isoflurane or desflurane/isoflurane/desflurane. Propofol was administered to maintain a steady-state serum concentration of 3 microg.ml(-1). Desflurane and isoflurane were administered at age-corrected 1 MAC. Hemodynamic stability was maintained. Transcranial Doppler sonography was used to measure Vmca. Hemodynamic variables as well as Vmca were measured 30 min after skin incision and repeated 30 min after each change in anesthetic maintenance agent. RESULTS The mean age and weight was 2.3 +/- 1.3 years and 13.0 +/- 3.7 kg, respectively. The Vmca (mean) increased by 35% from 37.7 +/- 10.5 cm s(-1) to 57.8 +/- 14.6 cm s(-1) (P < 0.0001) when propofol was changed to desflurane but was unaffected when desflurane replaced isoflurane. CONCLUSION When propofol is changed to desflurane, cerebral blood flow velocity increases significantly in normal children. This cerebral vasodilatory effect may have important implications in the neurosurgical setting.
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Affiliation(s)
- J H Smith
- Department of Anesthesia, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada
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Saito T, Mori K, Barlow R. Circadian Clock: Where Is It Located in the Limulus Brain? Biol Bull 2004; 207:153. [PMID: 27690582 DOI: 10.1086/bblv207n2p153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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Brown E, Hitt J, Dodge F, Barlow R. Circadian Rhythms in Limulus Visual Sensitivity Compensate for Day-Night Changes in Light Intensity. Biol Bull 2004; 207:152. [PMID: 27690584 DOI: 10.1086/bblv207n2p152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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Ridings C, Borst D, Smith K, Dodge F, Barlow R. Visual behavior of juvenile Limulus in their natural habitat and in captivity. Biol Bull 2002; 203:224-225. [PMID: 12414590 DOI: 10.2307/1543409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- C Ridings
- Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA
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Errigo M, McGuiness C, Meadors S, Mittmann B, Dodge F, Barlow R. Visually guided behavior of juvenile horseshoe crabs. Biol Bull 2001; 201:271-272. [PMID: 11687418 DOI: 10.2307/1543360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- M Errigo
- Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA
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Affiliation(s)
- R Barlow
- Center for Vision Research, Department of Ophthalmology, Upstate Medical University, 750 Adams Street, Syracuse, NY 13210, USA.
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Abstract
PURPOSE To estimate the annual incidence, cumulative probability of presumed urinary tract infection (UTI) by age, and the social costs. METHODS Analysis of a random digit dialing survey of 2000 women in the United States. RESULTS 10.8 percent (95% CI: 9.4, 12.1%) of women aged 18 and older reported at least one presumed UTI during the past 12 months, with the majority of the cases occurring among women with a history of two or more UTI episodes in their life. We estimate that by age 24, one-third of women will have at least one physician-diagnosed UTI that was treated with prescription medication. Overall, an estimated 11.3 million women in the United States had at least one presumed UTI treated with antibiotics in 1995. We estimate the annual cost of UTI cases with prescriptions to be $1.6 billion in 1995. If the costs occurring after 1995 are discounted at 5% annually, the total cost over 20 years has a present value of $25.5 billion. CONCLUSION If a vaccine were developed that would prevent either initial or recurrent UTI the net benefits to society would be substantial, even at a developmental cost of one billion dollars.
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Affiliation(s)
- B Foxman
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI, USA
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Abstract
BACKGROUND AND OBJECTIVES Incidence of Candida vaginitis by age and racial or ethnic group is poorly described. GOAL Estimate incidence, cumulative probability of presumed C vaginitis by age, racial or ethnic group, and associated costs. STUDY DESIGN Random digit-dialing survey of 2000 US women. RESULTS A total of 6.5 percent (95% CI, 5.4-7.5%) of women older than 18 years reported a least one episode of presumed C vaginitis during the previous 2 months. Women reporting a 1-year period with four or more episodes comprised 8.0% of the sample but accounted for 37.2% of women reporting episodes. Black women reported approximately three times more yeast infections in the previous 2 months (17.4%; 95% CI, 11.2-23.5%) than white women (5.8%; 95% CI, 4.7-6.9%). CONCLUSION The high incidence and the propensity for recurrence underscore the need for a better understanding of the epidemiology and pathogenesis, and stress the need for the development of more accurate, rapid diagnostics and effective treatments.
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Affiliation(s)
- B Foxman
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor 48109-2029, USA.
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Keay SD, Barlow R, Eley A, Masson GM, Anthony FW, Jenkins JM. The relation between immunoglobulin G antibodies to Chlamydia trachomatis and poor ovarian response to gonadotropin stimulation before in vitro fertilization. Fertil Steril 1998; 70:214-8. [PMID: 9696209 DOI: 10.1016/s0015-0282(98)00145-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [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: 11/16/2022]
Abstract
OBJECTIVE To determine whether a relation exists between previous exposure to Chlamydia trachomatis and impaired ovarian response to gonadotropin stimulation. DESIGN Controlled clinical study. SETTING Two university IVF centers. PATIENT(S) Two hundred forty-two patients receiving IVF treatment and 81 control patients. Ninety-four patients with a poor response to IVF, defined by cycle cancellation in response to a daily stimulation dose of 300 IU of FSH, and 148 patients with a good response were matched for age. Twenty-eight pregnant controls and 53 controls of proven fertility also were included. INTERVENTION(S) Serum samples were obtained from patients and controls. Serum levels of immunoglobulin (Ig) G antibodies to C. trachomatis were determined by ELISA. MAIN OUTCOME MEASURE(S) The prevalence of serum IgG antibodies to C. trachomatis in critically defined poor responders was compared with that of age-matched good responders. RESULT(S) A significantly higher proportion of poor responders had serum IgG antibodies to C. trachomatis compared with good responders (44.7% and 30.4%, respectively). Patients undergoing IVF had a significantly higher prevalence of IgG antibodies to C. trachomatis (36%) than did either pregnant or nonpregnant controls (12%). CONCLUSION(S) A significantly higher prevalence of serum IgG antibodies to C. trachomatis was observed in critically defined poor responders, suggesting a possible detrimental effect of C. trachomatis on subsequent ovarian function.
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Affiliation(s)
- S D Keay
- Department of Obstetrics and Gynaecology, St. Michael's Hospital, University of Bristol, United Kingdom
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Abstract
Deciphering the information that eyes, ears, and other sensory organs transmit to the brain is important for understanding the neural basis of behavior. Recordings from single sensory nerve cells have yielded useful insights, but single neurons generally do not mediate behavior; networks of neurons do. Monitoring the activity of all cells in a neural network of a behaving animal, however, is not yet possible. Taking an alternative approach, we used a realistic cell-based model to compute the ensemble of neural activity generated by one sensory organ, the lateral eye of the horseshoe crab, Limulus polyphemus. We studied how the neural network of this eye encodes natural scenes by presenting to the model movies recorded with a video camera mounted above the eye of an animal that was exploring its underwater habitat. Model predictions were confirmed by simultaneously recording responses from single optic nerve fibers of the same animal. We report here that the eye transmits to the brain robust "neural images" of objects having the size, contrast, and motion of potential mates. The neural code for such objects is not found in ambiguous messages of individual optic nerve fibers but rather in patterns of coherent activity that extend over small ensembles of nerve fibers and are bound together by stimulus motion. Integrative properties of neurons in the first synaptic layer of the brain appear well suited to detecting the patterns of coherent activity. Neural coding by this relatively simple eye helps explain how horseshoe crabs find mates and may lead to a better understanding of how more complex sensory organs process information.
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Affiliation(s)
- C Passaglia
- Marine Biological Laboratory, Woods Hole, MA 02543, USA
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Abstract
A 21 year old woman presented with painful groin lymphadenopathy and malaise. Lymph node biopsy, to exclude atypical infection and malignancy, suggested the diagnosis of lymphogranuloma venereum. This diagnosis was confirmed by serology and polymerase chain reaction, with the patient subsequently admitting to a casual sexual contact within the United Kingdom. Alternative methods of investigation of this disease are discussed.
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Affiliation(s)
- D J Kellock
- Department of Genito-urinary Medicine, Royal Hallamshire Hospital, Sheffield
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Abstract
This study examined the effects of four sets of factors on use of curative health services among rural women living in Gujarat, India. The sets of factors analyzed were as follows: (1) the demographic characteristics of the women; (2) the characteristics of the household in which they lived; (3) the characteristics of the environment in which they lived; and (4) the price and convenience of care. The study focused on rural married women aged 17-45 who had at least one child. Nested multiple logistic regressions were computed on cross-sectional data to assess the simultaneous influences of the independent variables on (1) reports of episodes of illness (2) use of curative services among rural women who reported an illness and (3) use of a specific service. Four types of service were examined as outcomes of interest, namely, private doctors, Aga Khan Health Services centres, government health centres, and traditional healers. Other things being equal, women's education, income, family structure and kinship affiliation were significant predictors of use of service. Women seemed to be more sensitive to travel time to the health service and its associated costs (purdah restrictions, transportation and time costs) than to the direct costs of service. Factors such as women's occupation and sanitation facilities, while associated with use of service in the expected direction, were not significant predictors of use of service. Implications for health planning are offered, including initiatives to implement health promotion and disease prevention programs in addition to increasing access to the existing health services. Avenues for future studies are suggested, particularly in regard to decision-making processes affecting the health-seeking behavior of rural women. It is recommended that such policies and studies should consider the cultural environment in addition to the existing pluralistic health system.
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Affiliation(s)
- B Vissandjée
- School of Nursing, University of Montréal, Québec, Canada
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Vissandjée B, Barlow R, Fraser DW. Utilization of health services among rural women in Gujarat, India. Public Health 1997. [DOI: 10.1038/sj.ph.1900332] [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: 11/09/2022]
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Hardman TC, Barlow R, Dubrey SW, Croft P, Lant AF. Kinetic characteristics of the erythrocyte sodium-lithium countertransporter in subjects with coronary artery disease. Am J Hypertens 1996; 9:184-7. [PMID: 8924269 DOI: 10.1016/0895-7061(95)00347-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Sodium-lithium countertransport activity, external affinity for sodium (kNa) and maximal rate of turnover (Vmax), were characterized in 21 male subjects (aged 45 to 65 years) with angiographically proven coronary artery disease; these were compared with a matched group of healthy controls. No significant differences in countertransport activity were noted between the coronary artery disease patients and the healthy controls. By contrast, the median [range] kNa in the coronary artery disease group (8.5 [2.6 to 30.5] mmol/L Na) was significantly lower than that in the controls (59.9 [5.9 to 240.5] mmol/L Na; P < .0001). This reduction was accompanied by a significantly lower mean Vmax (controls 0.403 +/- 0.187 v coronary artery disease group 0.248 +/- 0.121 mmol Li/L RBC/h; P < .01). The findings suggest that disturbed behavior of the sodium-lithium countertransporter is not confined to hypertension but may represent a broader-based membrane dysfunction associated with vascular disease.
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Affiliation(s)
- T C Hardman
- Department of Clinical Pharmacology and Therapeutics, Charing Cross and Westminster Medical School, Chelsea and Westminster Hospital, London, England
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Abstract
Attaining efficiency in a health care system with a budget constraint involves increasing the utilization of the most cost-effective services. This can be achieved by adjustments to prices, cost curves, or demand curves. In this paper, the potential for demand curve adjustments is examined by selecting two apparently cost-effective services (prenatal care and childhood immunization against tuberculosis), and analyzing the factors explaining their utilization. Data from recent household surveys in Burkina Faso and Niger are used. A multivariate analysis of utilization employs income, price, and taste variables. Utilization is highly sensitive to the distance which must be travelled to the health facility, a price, and taste variables. Utilization is highly sensitive to the distance which must be travelled to the health facility, a price variable. Members of certain ethnic groups tend to use the services less, other things being equal. The importance of demand-side factors like ethnicity points to certain kinds of policy interventions like information, education and communication activities which could increase the utilization of cost-effective services.
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Affiliation(s)
- R Barlow
- School of Public Health, University of Michigan, Ann Arbor 48109, USA
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Hardman TC, Croft P, Barlow R, Wierzbicki AS, Feher MD, Lant AF. Ethnic origin and hypertension-associated alterations in sodium-lithium countertransport kinetics. J Hum Hypertens 1995; 9:687-9. [PMID: 8523392] [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: 01/31/2023]
Abstract
In Caucasian subjects, elevated erythrocyte sodium-lithium countertransport (SLC) activity, displaying an increased affinity for external Na+ (decreased KNa), has a strong association with hypertension and has also been proposed as a potential marker for vascular disease. We have compared SLC activity and the kinetic components, KNa and maximal rate of turnover (Vmax), of the countertransporter in groups of Caucasian, Asian and Black hypertensive subjects matched for ethnicity, age and sex with healthy normotensive controls. SLC activity was the same in all ethnic groups irrespective of the presence of hypertension. Similarly, hypertension had no impact on Vmax values within each ethnic group (normotensive vs. hypertensives: Caucasian, 0.360 +/- 0.186 vs. 0.335 +/- 0.137; Asian, 0.324 +/- 0.078 vs. 0.273 +/- 0.105; black people, 0.192 +/- 0.123 vs. 0.178 +/- 0.082 mmol Li/l erythrocytes h). However, in black people compared with the other two ethnic groups, Vmax was lower for both controls and hypertensives (P < 0.05; ANOVA). Median KNa values in hypertensive subjects were consistently lower than their normotensive counterparts in all ethnic groups (P < 0.01; Kruskal-Wallis); Caucasians, (89.1 vs. 41.2 mmol Na; P = 0.01), Asians (121.1 vs. 33.1; P = 0.04) and black people (74.4 vs. 27.2 mmol Na; P = 0.02; Wilcoxon). The results show that Vmax is altered in black people independently of the presence of hypertension. This contrasts with KNa which, for each ethnic group studied, is reduced in the hypertensive compared with the normotensive state.
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Affiliation(s)
- T C Hardman
- Department of Clinical Pharmacology and Therapeutics, Charing Cross and Westminster Medical School, Chelsea and Westminster Hospital, London, UK
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Hardman T, Barlow R, Croft P, Wierzbicki A, Dubrey S, Feher M, Lant A. Relation between altered sodium-lithium countertransport kinetics and severity of vascular disease. Atherosclerosis 1995. [DOI: 10.1016/0021-9150(95)96724-7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Mattingly C, Barlow R. Outpatient requisition problem solved. MLO Med Lab Obs 1995; 27:57-9. [PMID: 10141922] [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: 02/11/2023]
Affiliation(s)
- C Mattingly
- Southern Ohio Medical Center, Portsmouth, USA
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Court JA, Perry EK, Spurden D, Lloyd S, Gillespie JI, Whiting P, Barlow R. Comparison of the binding of nicotinic agonists to receptors from human and rat cerebral cortex and from chick brain (alpha 4 beta 2) transfected into mouse fibroblasts with ion channel activity. Brain Res 1994; 667:118-22. [PMID: 7534607 DOI: 10.1016/0006-8993(94)91721-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [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: 01/25/2023]
Abstract
(-)-Nicotine, cytisine and carbachol evoked 86Rb efflux from mouse fibroblasts stably transfected with alpha 4 beta 2 chick brain nicotinic subunits. This response to (-)-nicotine was inhibited by mecamylamine and dihydro-beta-erythroidine and was mirrored by a rise in intracellular Ca2+ measured by microspectrofluorimetry. Lobeline and isoarecolone methiodide evoked no significant 86Rb from cells and unlike the above agonists displayed significantly different IC50 values for the displacement of [3H]nicotine from mammalian (rat and human cerebral cortex) and transfected fibroblast membranes.
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Affiliation(s)
- J A Court
- MRC Neurochemical Pathology Unit, Newcastle General Hospital, Newcastle upon Tyne, UK
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Hardman TC, Dubrey SW, Barlow R, Feher MD, Lant AF. Lack of acute effects of a standardised fat meal or exercise on erythrocyte sodium-lithium countertransport activity. J Hum Hypertens 1994; 8:641-3. [PMID: 7990102] [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: 01/28/2023]
Affiliation(s)
- T C Hardman
- Department of Clinical Pharmacology and Therapeutics, Chelsea and Westminster Hospital, London, UK
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Arthur PF, Hearnshaw H, Kohun PJ, Barlow R. Evaluation of Bos indicus and Bos taurus straightbreds and crosses. I. Post-weaning growth of steers in different environments. ACTA ACUST UNITED AC 1994. [DOI: 10.1071/ar9940783] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [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
Post-weaning growth of 186 steers comprizing straightbred Hereford (H x H) and Brahman (B x B), first-cross (B x H) and back-cross (H x BH and B x BH) was evaluated. The steers had been raised to weaning (8 months of age) by dams which grazed either high, medium or low quality pasture (pre-weaning pasture system) at Grafton, N.S.W. The steers were grown on pasture from time of weaning in one of three locations in New South Wales representing subtropical, temperate-good, and temperate-good to poor environments, and slaughtered when the average fat cover of the back-cross steers in each environment was 4-10 mm at the 12113th rib. Pre-weaning pasture system had a significant effect on post-weaning growth, with mean post-weaning (8-48 months of age) average daily gain (ADG) of steers from low (327� 8 g/day) being higher than that of steers from medium (304�6 g/day), which in turn, was higher than that of steers from high (276�9 g/day) quality pre-weaning pasture, indicating that steers from low and medium quality pastures exhibited compensatory growth. From 8 to 24 months of age, first-cross BxH steers had the highest ADG in all environments. The ranking of the other genotypes differed across environments. In the environment where growth rate was lowest (178 g/day for B x H), B x B and B x BH steers grew faster than H x H and H x BH steers; where growth rate was highest (584 g/day for B x H), the order was reversed; and where growth rate was intermediate (323 g/day for B x H), there were no significant differences in ADG among H x H, H x BH, B x BH and B x B steers. Steers from only two environments were retained after 24 months of age. Mean ADG from 8 to 36 or 48 months of age was not significantly different among straightbred and back-cross steers, but was lower than that for the first-cross steers. Genotype x environment interaction for liveweight at slaughter was not significant. First-cross B x H steers were 56 kg (11%) heavier (P < 0.05) than back-cross steers, which in turn, were 37 kg (8%) heavier (P < 0.05) than straightbred steers at slaughter.
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Arthur PF, Hearnshaw H, Kohun PJ, Barlow R. Evaluation of Bos indicus and Bos taurus straightbreds and crosses. III. Direct and maternal genetic effects on growth traits. ACTA ACUST UNITED AC 1994. [DOI: 10.1071/ar9940807] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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
Data on Brahman and Hereford cattle and their crosses were used to estimate direct additive, direct heterosis, maternal additive and maternal heterosis effects for pre-weaning and post-weaning liveweights, average daily gain (ADG) and height at various ages. The cattle were born at Grafton, N.S.W., and raised on high, medium and low quality pastures until weaning. During the post-weaning period, the steers were grown in three environments in New South Wales, while the heifers remained at Grafton. Genetic effects were estimated by regression and the additive components expressed as deviations from Hereford effect. Weaning weight and pre-weaning ADG of Hereford calves (both sexes) were 237.8 kg and 827 g/day on high, 210.5 kg and 704 g/day on medium, and 128.3 kg and 425 g/day on low quality pastures respectively. Post-weaning ADG of Hereford steers (weaning to 36 months) and heifers (weaning to 30 months) was 296 and 240 g/day respectively. Direct heterosis was significant (P<0.05) for most traits. Estimates of direct heterosis for weaning weight were 24.9 and 20.2 kg, and for pre-weaning ADG were 79 and 68 g/day, on high and medium quality pastures respectively. Direct heterosis for ADG of steers (weaning to 36 months) and heifers (weaning to 30 months) was 91 and 76 g/day respectively. Estimates of maternal heterosis for weaning weights were 14.9, 30.9 and 37.8 kg and for pre-weaning ADG were 31 (not significant), 105 and 153 g/day, for high, medium and low quality pastures respectively. Maternal heterosis for ADG of steers (weaning to 36 months) was -47 g/day. There was a negative direct additive effect on post-weaning ADG in environments where pasture quality was good, but the effect was not significant on poor quality pasture. Maternal additive effect was negative for birth weight for high and medium quality pastures and positive for weaning weight and pre-weaning ADG on low quality pasture. The performance of untested crosses can be predicted from the estimates and models provided.
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