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Fong KY, Yeo S, Luo H, Kofidis T, Teoh KLK, Kang GS. Stroke prevention strategies for cardiac surgery: a systematic review and meta-analysis of randomized controlled trials. ANZ J Surg 2024; 94:522-535. [PMID: 38529814 DOI: 10.1111/ans.18947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 01/15/2023] [Accepted: 03/04/2024] [Indexed: 03/27/2024]
Abstract
BACKGROUND Stroke is a much-feared complication of cardiac surgery, but existing literature on preventive strategies is fragmented. Hence, a systematic review and meta-analysis of stroke prevention strategies for cardiac surgery was conducted. METHODS An electronic literature search was conducted to retrieve randomized controlled trials (RCTs) investigating perioperative interventions for cardiac surgery, with stroke as an outcome. Random-effects meta-analyses were conducted to generate risk ratios (RRs), 95% confidence intervals (95% CI), and forest plots. Descriptive analysis and synthesis of literature was conducted for interventions not amenable to meta-analysis, focusing on risks of stroke, myocardial infarction and study-defined major adverse cardiovascular events (MACE). RESULTS Fifty-six RCTs (61 894 patients) were retrieved. Many included trials were underpowered to detect differences in stroke risk. Among pharmacological therapies, only preoperative amiodarone was shown to reduce stroke risk in one trial. Concomitant left atrial appendage closure (LAAC) significantly reduced stroke risk (RR = 0.55, 95% CI = 0.36-0.84, P = 0.006) in patients with preoperative atrial fibrillation, and there was no difference in on-pump versus off-pump coronary artery bypass grafting (CABG) (RR = 0.94, 95% CI = 0.64-1.37, P = 0.735). Much controversy exists in literature on the timing of carotid endarterectomy relative to CABG in patients with severe carotid stenosis. The use of preoperative remote ischemic preconditioning was not found to reduce rates of stroke or MACE. CONCLUSION This review presents a comprehensive synthesis of existing interventions for stroke prevention in cardiac surgery, and identifies gaps in research which may benefit from future, large-scale RCTs. LAAC should be considered to reduce stroke incidence in patients with preoperative atrial fibrillation.
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Affiliation(s)
- Khi Yung Fong
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Selvie Yeo
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Haidong Luo
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, Singapore, Singapore
| | - Theodoros Kofidis
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, Singapore, Singapore
| | - Kristine L K Teoh
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, Singapore, Singapore
| | - Giap Swee Kang
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, Singapore, Singapore
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Yeo S, Chen J, Leow L, Luo H, Chung Tam JK. Efficacy of mesh coverage in surgical bullectomy for primary spontaneous pneumothorax: A systematic review and meta-analysis. Surgeon 2023; 21:e378-e406. [PMID: 37714802 DOI: 10.1016/j.surge.2023.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 07/26/2023] [Accepted: 08/14/2023] [Indexed: 09/17/2023]
Abstract
BACKGROUND AND PURPOSE Thoracic surgeons are now adopting a new method of using a mesh covering to reduce recurrence in surgical pleurodesis for pneumothorax. We aimed to review the literature and compare the outcomes of using mesh covering as an additional procedure during surgical pleurodesis. METHODS A comprehensive search was performed from inception to October 2022 on PubMed, Embase, Cochrane and Scopus. Randomised controlled trials (RCTs) and observational cohort studies (OCSs) comparing the use of mesh coverage, and different materials were included. Data were extracted to compare recurrence and other outcomes using a random effect model. RESULTS 23 studies consisting of 2 RCTs and 21 OCSs totalling 5092 patients were included. Patients with a mesh had a significantly lower recurrence (OR = 0.22, 95% CI 0.12-0.42, p < 0.0001) and a shorter duration of chest tube drainage (SMD = -0.74 days, 95% CI -0.28 to -1.20, p < 0.0001) but no significant difference in the length of operation. The use of polyglycolic acid (PGA) and vicryl mesh was associated with a significantly shorter duration of chest tube drainage [(PGA, SMD = 0.83 days, 95% CI 0.14-1.52, p < 0.0001), (vicryl, SMD = 1.06 days, 95% CI 0.71-2.82, p = 0.0005)]. They also had a shorter post-operative length of stay than oxidized regenerative cellulose (ORC) but this was not statistically significant. CONCLUSION The use of a mesh material reduced the incidence of post-operative air leaks in the short term and the recurrence rate in the long term. Some mesh materials such as PGA and vicryl performed better than other materials.
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Affiliation(s)
- Selvie Yeo
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Jianye Chen
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre Singapore, Singapore
| | - Lowell Leow
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre Singapore, Singapore
| | - Haidong Luo
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre Singapore, Singapore
| | - John Kit Chung Tam
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre Singapore, Singapore.
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Li T, Yeo S, Sari NY, Ngiam N, Lee CH, Lim TW, Yeo WT, Seow SC, Lim YC, Yeo TC, Yip JWL, Poh KK, Kong WK, Lin W, Sia CH, Wong RCC. VALIDATION OF RISK STRATIFICATION MODELS FOR SUDDEN CARDIAC DEATH IN MULTI-ETHNIC ASIAN PATIENTS WITH HYPERTROPHIC CARDIOMYOPATHY. J Am Coll Cardiol 2023. [DOI: 10.1016/s0735-1097(23)00512-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Sari NY, Li T, Yeo S, Ngiam N, Lee RCH, Lee E, Yeo TC, Yip JWL, Poh KK, Kong WK, Lim YC, Lin W, Sia CH, Wong RCC. ASSOCIATION OF LEFT VENTRICULAR GLOBAL LONGITUDINAL STRAIN AND CARDIOVASCULAR OUTCOMES IN PATIENTS WITH HYPERTROPHIC CARDIOMYOPATHY. J Am Coll Cardiol 2023. [DOI: 10.1016/s0735-1097(23)01186-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Sari NY, Li TYW, Yeo S, Ngiam NJH, Lee CH, Evangelista LKM, Lee ECY, Yeo TC, Yip JWL, Poh KK, Kong WKF, Lin WQ, Lim YC, Sia CH, Wong RCC. Association of left atrial ejection fraction and cardiovascular outcomes in Asian patients with hypertrophic cardiomyopathy. Eur Heart J 2023. [DOI: 10.1093/eurheartj/ehac779.076] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Public Institution(s). Main funding source(s): National University of Singapore Yong Loo Lin School of Medicine's Junior Academic Fellowship Scheme
Background
The optimal method of risk stratification of hypertrophic cardiomyopathy (HCM) patients, especially in the Asian population, is unknown. Left atrial ejection fraction (LAEF) is an emerging risk marker for cardiovascular outcomes. This study aimed to investigate whether LAEF was associated with cardiovascular outcomes in Asian patients with HCM.
Methods
This was a retrospective cohort study performed in a tertiary academic centre involving 291 consecutive patients diagnosed with HCM between 2010 and 2017. We collected the relevant clinical characteristics of these patients and retrospectively analysed the index transthoracic echocardiograms for novel left atrial indices including LAEF. We obtained the maximum (LAVmax) and minimum left atrial volumes (LAVmin) using the biplane method of disks in apical 4- and 2-chamber views. LAEF was derived by dividing the difference between LAVmax and LAVmin by LAVmax. We assessed the patients for outcomes of (1) heart failure requiring admission, and (2) a composite of adverse outcomes including all-cause mortality, ventricular tachycardia / ventricular fibrillation (VT/VF) events, appropriate device therapy if an implantable cardioverter defibrillator (ICD) was implanted, stroke and heart failure hospitalization.
Results
The patients had a mean age of 59.0 ± 16.7 years-old at diagnosis and had a male preponderance (71.2%). The most common comorbidities were hypertension, diabetes mellitus and ischemic heart disease. On univariable logistic regression analysis, maximum and minimum left atrial volume index (LAVI) as well as LAEF showed a significant association with heart failure and the predefined composite outcome. On Cox regression analysis adjusting for variables of age, sex, left ventricular ejection fraction (LVEF), left ventricular maximal wall thickness >30mm, significant left ventricular outflow tract (LVOT) gradient of > 30mmHg and more than moderate mitral regurgitation, maximum and minimum LAVI as well as LAEF retained an association with heart failure admission but only minimum LAVI and LAEF were associated with the composite outcome [(OR 0.019, 95% CI 0.02-0.230, p=0.002), (OR 0.226, 95% CI 0.053-0.960, p=0.044), (OR 1.030, 95% CI 1.016-1.045, p<0.001), and (OR 1.016, 95% CI 1.005-1.026, p=0.004) respectively].
Conclusion
LAEF was an independently associated with congestive heart failure as well as a composite of adverse outcomes in Asian patients with HCM.
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Affiliation(s)
- N Y Sari
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - T Y W Li
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - S Yeo
- National University of Singapore, Cardiology , Singapore , Singapore
| | - N J H Ngiam
- National University Health System, Medicine , Singapore , Singapore
| | - C H Lee
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - L K M Evangelista
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - E C Y Lee
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - T C Yeo
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - J W L Yip
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - K K Poh
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - W K F Kong
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - W Q Lin
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - Y C Lim
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - C H Sia
- National University Heart Centre, Cardiology , Singapore , Singapore
| | - R C C Wong
- National University Heart Centre, Cardiology , Singapore , Singapore
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Tjin A, Troy C, Vinarti RA, Banerjee D, Goodwin A, Yeo S, Saha S, KRISHNA M, Goswami SP, Chen YS, Leroi I, O'Sullivan R. Role strain and COVID‐era burden among South Asian caregivers of individuals with brain health conditions and disabilities. Alzheimers Dement 2022. [DOI: 10.1002/alz.064197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Anna Tjin
- RCSI SIM Centre for Simulation Education and Research, RCSI University of Medicine and Health Sciences Dublin Ireland
| | - Carol Troy
- International Business Administration Program, International College, Tunghai University Taichung Taiwan
| | | | - Debanjan Banerjee
- National Institute of Mental Health and Neurosciences Bangalore Bangalore India
| | | | - Selvie Yeo
- Yong Loo Lin School of Medicine, National University of Singapore Singapore Singapore
| | | | - Murali KRISHNA
- Foundation for Research and Advocacy in Mental Health and Viveka Hospital Mysore India
| | - S P Goswami
- All India Institute of Speech and Hearing Mysore India
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Yeo S, Chapman S, Taylor P, Langrehr J, Lange D, Morton J. P216 Assessing patient satisfaction with the cystic fibrosis telehealth service. J Cyst Fibros 2021. [DOI: 10.1016/s1569-1993(21)01241-8] [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: 10/21/2022]
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Lee J, Chung S, Youn S, Kim C, Yeo S. The influence of cognitive emotion regulation strategies on depressive symptoms in breast cancer patients. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.606] [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: 11/16/2022]
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Kou S, Cao JY, Yeo S, Holmes-Walker DJ, Lau SL, Gunton JE. Ethnicity influences cardiovascular outcomes and complications in patients with type 2 diabetes. J Diabetes Complications 2018; 32:144-149. [PMID: 29199084 DOI: 10.1016/j.jdiacomp.2017.10.016] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 10/22/2017] [Accepted: 10/30/2017] [Indexed: 10/18/2022]
Abstract
AIM To determine whether cardiovascular outcomes in type 2 diabetes (T2D) differ according to ethnicity, and whether ethnicity influences the effect of gender on these outcomes in Caucasians, East-Southeast-Asians, Middle-Easterners, South-Asians and Pacific-Islanders. METHODS We compared demographics, HbA1c, lipid profile, renal function markers, and prevalence of macrovascular and microvascular complications between ethnic groups. Cross-sectional data was prospectively collected from 204 consecutive patients at Westmead Hospital's T2D clinic from April-October 2015. Univariate analysis was performed using chi-squared test for categorical data, and Mann-Whitney-U or Kruskal-Wallis test for continuous data. RESULTS Compared to Caucasians, South-Asians were diagnosed younger, were currently younger, had lower body-mass-index (BMI) and better renal function but higher rates of non-ST-elevation myocardial infarction (STEMI, 21.7% versus 3.5%, p<0.05). East-Southeast-Asians had lower BMI but more nephropathy than Caucasians (59% versus 39%, p<0.05). East-Southeast-Asian males had fewer CVD than Caucasians, but this protection was absent in East-Southeast-Asian females. Middle-Easterners had more non-STEMI than Caucasians (5.3% vs 3.5%, p<0.05). Middle-Eastern females were not at lower CVD risk than males. Caucasians had most PVD (20% versus 6%, p<0.05). CONCLUSIONS Ethnicity influences rates of diabetes-related complications. Female CVD protection is altered in some groups. Ethnicity should be considered in assessing CVD and complications risk.
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Affiliation(s)
- S Kou
- Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
| | - J Y Cao
- Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
| | - S Yeo
- Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
| | - D J Holmes-Walker
- Sydney Medical School, The University of Sydney, Sydney, NSW, Australia; Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, NSW, Australia
| | - S L Lau
- Sydney Medical School, The University of Sydney, Sydney, NSW, Australia; Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, NSW, Australia
| | - J E Gunton
- Sydney Medical School, The University of Sydney, Sydney, NSW, Australia; Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, NSW, Australia; The Westmead Institute for Medical Research, The University of Sydney, NSW, Australia.
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Charles J, Roberts J, Din N, Williams N, Yeo S, Edwards R. Preferences of older patients regarding hip fracture rehabilitation service configuration: A feasibility discrete choice experiment. J Rehabil Med 2018; 50:636-642. [DOI: 10.2340/16501977-2350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Duteille F, Yeo S, Perrot P. [Microsurgery in children]. ANN CHIR PLAST ESTH 2016; 61:770-778. [PMID: 27475030 DOI: 10.1016/j.anplas.2016.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 07/04/2016] [Indexed: 11/28/2022]
Abstract
While we celebrated the fortieth anniversary of the first free flap in children, new techniques emerged in reconstructive surgery (NPT, artificial dermis…) and reduced microsurgery procedures. However, microsurgery in children as in adults still have clinical applications in reconstructive surgery. Free flaps remain essential in clinical situations where they are the only ones to provide capacity for growth and stability scarring, two elements essential to the future quality of life of the children.
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Affiliation(s)
- F Duteille
- Service de chirurgie plastique et reconstructrice, centre des brûlés, hôpital Jean-Monnet, CHU de Nantes, 44093 Nantes cedex 01, France; Inserm U957, laboratoire de physiopathologie de la résorption osseuse, université de Nantes, 44035 Nantes, France.
| | - S Yeo
- Service de chirurgie plastique et reconstructrice, centre des brûlés, hôpital Jean-Monnet, CHU de Nantes, 44093 Nantes cedex 01, France
| | - P Perrot
- Service de chirurgie plastique et reconstructrice, centre des brûlés, hôpital Jean-Monnet, CHU de Nantes, 44093 Nantes cedex 01, France; Inserm U957, laboratoire de physiopathologie de la résorption osseuse, université de Nantes, 44035 Nantes, France
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Yeo S, Enoch MA, Gorodetsky E, Akhtar L, Schuebel K, Roy A, Goldman D. The influence of FKBP5 genotype on expression of FKBP5 and other glucocorticoid-regulated genes, dependent on trauma exposure. Genes Brain Behav 2016; 16:223-232. [PMID: 27648526 DOI: 10.1111/gbb.12342] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 09/01/2016] [Accepted: 09/16/2016] [Indexed: 01/17/2023]
Abstract
The FK506 binding protein 51 (FKBP5), an intrinsic regulator of the glucocorticoid receptor, has been associated with pathological behaviors particularly in the context of childhood trauma (CT), via a putatively regulatory polymorphism, rs1360780. However, trans- and cis-acting effects of this locus and its interaction with CT are incompletely understood. To study its effects on the expression of glucocorticoid-regulated genes including FKBP5, we used lymphoblastoid cell lines (LCLs) derived from 16 CT-exposed patients with greater than two substance dependence/suicidal behavior diagnoses (casesCT+) and 13 non-CT-exposed controls (controlsCT-). This study in LCLs measures long-term trait-like differences attributable to genotype or lasting epigenetic modification. Through analysis of differential allelic expression (DAE) using an FKBP5 3'-UTR reporter single nucleotide polymorphism (SNP), rs3800373, that is in strong linkage disequilibrium with rs1360780, we confirmed that the rs1360780 risk allele (A) (or conceivably that of a linked SNP) leads to higher FKBP5 expression in controlsCT-. Intriguingly, casesCT+ did not show DAE, perhaps because of a genotype-predicted difference in FKBP5 DNA methylation restricted to casesCT+. Furthermore, through correlation analyses on FKBP5 expression at baseline and after induction by dexamethasone, we observed that casesCT+ had lower induction of FKBP5 expression, indicating that overall they may have strong ultra-short negative-feedback. Only casesCT+ showed an effect of rs1360780 genotype on expression of FKBP5 and other glucocorticoid-regulated genes. Together, these results confirm that the rs1360780 locus alters FKBP5 expression and further that in trans-fashion this locus affects the expression of other glucocorticoid-regulated genes after a glucocorticoid challenge. The CT exposure appears to be essential for trans-effects of rs1360780 on glucocorticoid-regulated genes.
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Affiliation(s)
- S Yeo
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD
| | - M-A Enoch
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD
| | - E Gorodetsky
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD
| | - L Akhtar
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD
| | - K Schuebel
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD
| | - A Roy
- Psychiatry Service, Department of Veterans Affairs, New Jersey VA Health Care System, East Orange, NJ, USA
| | - D Goldman
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD
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Rogozinska E, D'Amico MI, Khan KS, Cecatti JG, Teede H, Yeo S, Vinter CA, Rayanagoudar G, Barakat R, Perales M, Dodd JM, Devlieger R, Bogaerts A, van Poppel MNM, Haakstad L, Shen GX, Shub A, Luoto R, Kinnunen TI, Phelan S, Poston L, Scudeller TT, El Beltagy N, Stafne SN, Tonstad S, Geiker NRW, Ruifrok AE, Mol BW, Coomarasamy A, Thangaratinam S. Development of composite outcomes for individual patient data (IPD) meta-analysis on the effects of diet and lifestyle in pregnancy: a Delphi survey. BJOG 2015; 123:190-8. [DOI: 10.1111/1471-0528.13764] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/19/2015] [Indexed: 12/01/2022]
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Disseler SM, Chen Y, Yeo S, Gasparovic G, Piccoli PMB, Schultz AJ, Qiu Y, Huang Q, Cheong SW, Ratcliff W. One Dimensional(1D)-to-2D Crossover of Spin Correlations in the 3D Magnet ZnMn2O4. Sci Rep 2015; 5:17771. [PMID: 26644220 PMCID: PMC4672353 DOI: 10.1038/srep17771] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 06/18/2015] [Accepted: 11/04/2015] [Indexed: 11/22/2022] Open
Abstract
We report on the intriguing evolution of the dynamical spin correlations of the frustrated spinel ZnMn2O4. Inelastic neutron scattering and magnetization studies reveal that the dynamical correlations at high temperatures are 1D. At lower temperature, these dynamical correlations become 2D. Surprisingly, the dynamical correlations condense into a quasi 2D Ising-like ordered state, making this a rare observation of two dimensional order on the spinel lattice. Remarkably, 3D ordering is not observed down to temperatures as low as 300 mK. This unprecedented dimensional crossover stems from frustrated exchange couplings due to the huge Jahn-Teller distortions around Mn3+ ions on the spinel lattice.
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Affiliation(s)
- S M Disseler
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Y Chen
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - S Yeo
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854.,Korea Atomic Energy Research Institute, Daejeon, Korea
| | - G Gasparovic
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - P M B Piccoli
- Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - A J Schultz
- Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Y Qiu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - Q Huang
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - S-W Cheong
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
| | - W Ratcliff
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Jang S, Choi B, Kim S, Chang C, Jung Y, Yeo S. Injury of the corticoreticular pathway in subarachnoid haemorrhage after rupture of a cerebral artery aneurysm. J Rehabil Med 2015; 47:133-7. [DOI: 10.2340/16501977-1896] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Cho K, Min C, Jung J, Lee S, Lee S, Huh H, Cho S, Shim J, Chang K, Kim W, Yong Ho K, Moon S, Kim E, Yeo S, Kwon S. Dosimetric Evaluation Using MVCT Images for Adapted Plan-Dose Monitoring in Tomotherapy. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2492] [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: 12/01/2022]
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Gehrig P, Song L, Thompson W, Moore D, Yeo S. Self-reported physical activity among gynecologic oncology patients in an outpatient setting: A pilot survey. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.414] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Kim M, Kim E, Min C, Yeo S. AOSP1 INTENSITY-MODULATED STEREOTACTIC BODY RADIOTHERAPY FOR STAGE I NON-SMALL-CELL LUNG CANCER. Eur J Cancer 2013. [DOI: 10.1016/s0959-8049(13)70016-9] [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: 10/27/2022]
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Yeo S, Jang S. Neural reorganization following bilateral injury of the fornix crus in a patient with traumatic brain injury. J Rehabil Med 2013; 45:595-8. [DOI: 10.2340/16501977-1145] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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van den Noort M, Bosch P, Kueppenbender N, Mondt K, van de Craen P, Yeo S, Lim S. P01-106 - Verbal working memory capacity in patients with chronic schizophrenia, chronic depression, and healthy participants. Eur Psychiatry 2010. [DOI: 10.1016/s0924-9338(10)70222-4] [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: 10/19/2022] Open
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Yeo S, Perrot P, Duteille F. [Free tissue transfers with lengthening of vascular pedicle using interpositional vein grafts. About 10 cases]. ANN CHIR PLAST ESTH 2009; 55:143-6. [PMID: 19443094 DOI: 10.1016/j.anplas.2009.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2008] [Accepted: 03/03/2009] [Indexed: 11/20/2022]
Abstract
The realization of free flaps with lack of reliable vessels nearby the loss of substance is a difficult problem for plastic surgeons. We report 10 cases of free tissue transfers with a one-stage technique lengthening the vascular pedicle of the free flap with interpositional vein grafts. Taking into consideration the good results and the low rate of morbidity, the authors emphasize the use of this technique rather than a two-stage procedure.
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Affiliation(s)
- S Yeo
- Service de chirurgie plastique, reconstructrice et esthétique, centre des brûlés, CHU de Nantes, 30, boulevard Jean-Monnet, 44093 Nantes cedex 1, France
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Yeo S, Guha S, Cheong SW. Generic properties of Mn spinels with an immiscibility induced by a Jahn-Teller distortion. J Phys Condens Matter 2009; 21:125402. [PMID: 21817463 DOI: 10.1088/0953-8984/21/12/125402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The generic properties are scrutinized in Mn spinels with an immiscibility induced by a Jahn-Teller distortion through the CoFe(2-x)Mn(x)O(4) system. The x-ray diffraction experiment reveals that the immiscibility occurs at 1.1<x<2.0 and the relevant kinetics becomes faster with x. The temperature of the Jahn-Teller transition, which accompanies a sharp resistivity anomaly and matches the immiscibility gap boundary, increases with increasing x. The evolution of the magnetic and structural properties with various thermal treatments is studied carefully in this paper. Based on our comprehensive results, we have constructed a phase diagram of CoFe(2-x)Mn(x)O(4).
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Affiliation(s)
- S Yeo
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA. Korea Atomic Energy Research Institute, 150 Dukjin-Dong, Yuseong-Gu, Daejeon, Republic of Korea
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Yeo S, Cho M, Kim J. Tumor Interstitial Fluid Pressure as a Prognostic Factor after Definitive Radiation Therapy for Carcinoma of Cervix. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.583] [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: 11/26/2022]
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Richard-Kadio M, Yeo S, Kossoko H, Allah CK, Assi-Dje Bi Dje V. [Dupuytren's contracture. A report of three cases in Black Africans]. Chir Main 2007; 27:40-2. [PMID: 18162430 DOI: 10.1016/j.main.2007.10.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Revised: 10/21/2007] [Accepted: 10/25/2007] [Indexed: 11/16/2022]
Abstract
Having reported the first case of Dupuytren's disease in West Africa in 1990, the authors report two further cases, which brings the number of Dupuytren's disease reported in West Africa to three. The authors demonstrate by a literature review, that numerous cases had in fact been described in black people since 1974. The factors which are incriminated are always alcoholism, microtrauma and other factors like diabetes. Dupuytren's disease appears to be a condition, which is actually not so rare in black people after all.
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Affiliation(s)
- M Richard-Kadio
- Service de chirurgie plastique, reconstructrice et esthétique, CHU de Treichville, 01, B.P. V 3, Abidjan 01, Cote d'Ivoire
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Yeo S, Cho M, Yoon W, Song K, Nam J, Kim K, Kim J. 2130. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.534] [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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Chop M, Yeo S, Kim K, Kim S, Lim S, Kim J. P-708 Treatment outcomes of three-dimensional conformal radiotherapy for non-small cell lung cancer. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)81201-2] [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: 11/30/2022]
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Abstract
We compared ropivacaine 0.75% and bupivacaine 0.5% for extending low-dose epidural analgesia for emergency Caesarean section, using a prospective double-blind randomised controlled trial design. The trial was halted after 45 patients were studied (23 ropivacaine; 22 bupivacaine) because bupivacaine was replaced by levobupivacaine in our unit. Time to reach T4 for loss of cold sensation was similar in both groups, although analgesic supplementation was required less often in the ropivacaine group than in the bupivacaine group (2/23 vs. 9/21; p = 0.01).
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Affiliation(s)
- R D Sanders
- Magill Department of Anaesthesia, Intensive Care & Pain Management, Chelsea and Westminster Hospital, 369 Fulham Road, London, SW10 9NH, UK
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Wee G, Kim SH, Kim K, Yeo S, Koo DB, Moon S, Lee KK, Han YM. 134INCOMPLETE HISTONE ACETYLATION OF SOMATIC CHROMATIN IN BOVINE OOCYTES. Reprod Fertil Dev 2004. [DOI: 10.1071/rdv16n1ab134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Histone acetylation as an important regulatory mechanism of chromatin structure preceeding zygotic gene expression in early embryo development. After fertilization, transcriptional activation of the embryo begins during the S/G2 phase of the first cell cycle. However, the precise mechanism underlying activation of zygotic transcription remains to be understood, especially in bovine nuclear transfer (NT) embryos. It is known that acetylation of histone H4 lysine 5 (H4K5) represents hyperacetylation state, which is correlated with gene expression. In this study, the acetylation of H4K5 was observed during pronuclear formation by using immunofluorescence analysis with anti-AcH4K5. Our data were analyzed by the general linear models (GLM) procedure of the SAS. In IVF embryos, acetylation of H4K5 occurred on the paternal chromatin at 8h after fertilization but did not occur on the maternal chromatin until 10h after fertilization. Reconstructed oocytes with deactylated somatic cell nuclei began to show signs of acetylation on chromatin at 3h after fusion. When acetylation intensity was calculated using an image analyzer, IVF embryos presented a higher acetylation signal than NT embryos (P<0.05). To induce hyperacetylation in NT embryos, somatic cells were exposed to trichostatin A (TSA, 1μM for 60h), a specific inhibitor of histone deacetylase (HDAC), prior to NT. Acetylated signals of H4K5 increased significantly in TSA-treated cells as compared with non-treated cells (P<0.05). The reconstructed embryos with TSA-treated cells showed a higher fluorescence intensity than the oocytes with non-treated cells (P<0.05), but weak signals compared to IVF embryos. Thus, the results demonstrated low histone acetylation level of somatic cell nuclei after NT during the zygotic progress. Our findings suggest that developmental failures of NT embryos may be due to incomplete chromatin remodeling of somatic cell nuclei during early embryonic development.
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Yeo S, Kang YK, Koo DB, Han JS, Chang WK, Park JK, Han YM, Lee KK. 135DNA METHYLATION PROFILES IN THE PREIMPLANTATION PORCINE EMBRYOS. Reprod Fertil Dev 2004. [DOI: 10.1071/rdv16n1ab135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
DNA methylation at CpG dinucleotides is an important epigenetic regulation process, which is associated with gene expression without any change in DNA sequence. During early development of the mouse embryo, dynamic changes in DNA methylation of the genome occur. After fertilization, active demethylation occurs on the paternal genome followed by passive demethylation until morula stage and then de novo methylation at the blastocyst stage. This study was designed to investigate changes in DNA methylation of in vivo- and in vitro-fertilized (IVF) porcine embryos. DNA methylation states were observed in preimplantation porcine embryos by using an immunofluorescence method after staining with an antibody against 5-methylcytosine. In contrast to the data from mouse embryos, active demethylation of the genome from the paternal pronucleus was not observed in the porcine embryos. Also, no passive demethylation was detected in in vivo- and IVF-derived embryos until the morula stage. Moreover, differential de novo methylation was not shown on the genome of the inner cell mass. Whole genomes of inner cell mass and trophectoderm cells were fully methylated. Our results demonstrate that DNA methylation of porcine embryos is different from that of mouse embryos during preimplantation development, suggesting that the machinery to regulate DNA methylation may be species-specific in mammals.
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Yeo S, Nakatsuji S, Bianchi AD, Schlottmann P, Fisk Z, Balicas L, Stampe PA, Kennedy RJ. First-order transition from a Kondo insulator to a ferromagnetic metal in single crystalline FeSi(1-x)Ge(x). Phys Rev Lett 2003; 91:046401. [PMID: 12906679 DOI: 10.1103/physrevlett.91.046401] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2003] [Indexed: 05/24/2023]
Abstract
The phase diagram of FeSi(1-x)Ge(x), obtained from magnetic, thermal, and transport measurements on single crystals, shows a discontinuous transition from Kondo insulator to ferromagnetic metal with x at a critical concentration, x(c) approximately 0.25. The gap of the insulating phase strongly decreases with x. The specific heat gamma coefficient appears to track the density of states of a Kondo insulator. The phase diagram is consistent with an insulator-metal transition induced by a reduction of the hybridization with x in conjunction with disorder on the Si/Ge ligand site.
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Affiliation(s)
- S Yeo
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, USA
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Ash S, Reeves MM, Yeo S, Morrison G, Carey D, Capra S. Effect of intensive dietetic interventions on weight and glycaemic control in overweight men with Type II diabetes: a randomised trial. Int J Obes (Lond) 2003; 27:797-802. [PMID: 12821964 DOI: 10.1038/sj.ijo.0802295] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.1] [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] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To investigate the effectiveness of intensive innovative methods for implementing dietary prescriptions on weight management and glycaemic control in overweight men with Type II diabetes. DESIGN A randomised clinical trial with a 12-week intervention period - three isocaloric dietary intervention groups (intermittent energy restriction, pre-portioned meals and self-selected meals) each with weekly dietitian contact - and a follow-up visit after 18 months. SUBJECTS A total of 51 men with Type II diabetes (mean age 54 y, mean body mass index (BMI) 31.7 kg/m(2)). MEASUREMENTS Weight, body composition, waist circumference, glycaemic control (HbA(1c)) and blood lipids. RESULTS For all subjects, intensive diet therapy over the 12-week intervention period resulted in a mean reduction in energy intake of 2360+/-2780 kJ/day (564+/-665 kcal/day) and significant reductions in weight (6.4+/-4.6 kg), waist circumference (8.1+/-4.6 cm), percent body fat (1.9+/-1.5%), HbA(1c) (1.0+/-1.4%) and triglyceride levels (0.3+/-0.6 mmol/l) compared to baseline levels. Intervention group did not affect clinical outcomes, with the exception of percent body fat. A total of 27 (52.9%) subjects attended the 18-month follow-up visit. At this visit, none of the improvements in clinical parameters was maintained, with all parameters returning to preintervention levels. CONCLUSIONS : A dietary prescription of 6000-7000 kJ/day (1400-1700 kcal/day) was effective in achieving a 6% weight loss and improving glycaemic control. The method of implementation made no difference to the outcomes between groups at 12 weeks or 18 months. Thus, we propose that it was the intensive weekly contact with a health professional in combination with moderate energy restriction that facilitated the successful short-term results seen.
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Affiliation(s)
- S Ash
- Princess Alexandra Hospital, Nutrition and Dietetic Services, Woolloongabba, Brisbane, Queensland, Australia.
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Nakatsuji S, Yeo S, Balicas L, Fisk Z, Schlottmann P, Pagliuso PG, Moreno NO, Sarrao JL, Thompson JD. Intersite coupling effects in a kondo lattice. Phys Rev Lett 2002; 89:106402. [PMID: 12225209 DOI: 10.1103/physrevlett.89.106402] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2002] [Indexed: 05/23/2023]
Abstract
The La dilution of the Kondo lattice CeCoIn5 is studied. The scaling laws found for the magnetic susceptibility and the specific heat reveal two well-separated energy scales, corresponding to the single-impurity Kondo temperature T(K) and an intersite spin-liquid temperature T(*). The Ce-dilute alloy has the expected Fermi liquid ground state, while the specific heat and resistivity in the dense Kondo regime exhibit non-Fermi-liquid behavior, which scales with T(*). These observations indicate that the screening of the magnetic moments in the lattice involves antiferromagnetic intersite correlations with a larger energy scale in comparison with the Kondo impurity case.
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Affiliation(s)
- S Nakatsuji
- National High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee 32310, USA
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Yeo S, Davidge ST. Possible beneficial effect of exercise, by reducing oxidative stress, on the incidence of preeclampsia. J Womens Health Gend Based Med 2001; 10:983-9. [PMID: 11788108 DOI: 10.1089/152460901317193558] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
We hypothesize that regular exercise enhances antioxidative enzymes in pregnant women, which reduce oxidative stress and, thus, the incidence of preeclampsia. Oxidative stress with enhanced lipid peroxide formation could lead to endothelial dysfunction in preeclampsia. Other conditions, such as increased transferrin saturation and decreased iron-binding capacity, directly and indirectly promote the process of oxidative stress and subsequent endothelial dysfunction. Exercise increases oxidative metabolism and produces a prooxidant environment. This acidic environment during exercise (at or beyond anaerobic threshold) promotes oxygen release from hemoglobin and increases in PO(2) in tissues, as well as releases iron from transferrin. When exercise is repeated regularly, the body promptly adjusts so that oxidative stress is eliminated or reduced. The body's adaptations to a regular exercise habit seem to have an antioxidant effect. In humans, training effects have been identified with an enhanced activity of antioxidative enzymes. Another concerted adaptation that regular exercise brings to women's bodies is resistance against production of prooxidants by increasing the number of mitochondria. Equally important is a training effect that decreases susceptibility to lipid peroxidation. Evidence suggests that physically active women are less likely to develop preeclampsia. In theory, intracellular and extracellular conditions resulting from regular exercise should counteract the enhancement of oxidative stress, thus interfering with the process leading to endothelial dysfunction. This position paper describes a hypothesis and includes a brief review of exercise physiology and biochemical research in preeclampsia. Unlike other preventive treatments, such as aspirin or calcium supplements, a regular exercise habit leads to a positive and healthy lifestyle without concern of side effects.
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Affiliation(s)
- S Yeo
- The University of Michigan, School of Nursing Division of Health Promotion and Risk Reduction, Ann Arbor, Michigan, USA
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Kim C, Yeo S, Cho G, Lee J, Choi M, Won C, Kim J, Lee S. Polymelia with two extra forelimbs at the right scapular region in a male Korean native calf. J Vet Med Sci 2001; 63:1161-4. [PMID: 11714039 DOI: 10.1292/jvms.63.1161] [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: 11/22/2022] Open
Abstract
In a male Korean native calf 14 days of age, polymelia (notomelia) was observed macroscopically and radiographically. External features included two normal forelimbs, two normal hindlimbs and two undeveloped extra forelimbs. The extra forelimbs were attached to the caudal regions of the right scapula and devoid of muscular tissues. In the extra forelimbs, a scapula-like bone formed a joint with the incompletely duplicated humerus. The humerus fused with the incompletely duplicated radius. The ulna, carpal bones, metacarpal bones and phalanges were completely duplicated. But one set of the duplicated carpal bones consisted of five bones: radial, accessory, fourth carpal, fused second and third carpal, and fused ulnar and intermediate carpal bones. The hoof and the rudimentary hoof of accessory digit were duplicated.
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Affiliation(s)
- C Kim
- Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University, Chinju, Korea
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Abstract
The hazards associated with invasive candidiasis and aspergillosis in oncology patients are well recognised. These conditions typically present late in treatment, often after prolonged or recurrent episodes of neutropenia. We report the occurrence of Absidia corymbifera infection causing rhinocerebral zygomycosis in two children with acute lymphoblastic leukaemia, early in the induction phase of treatment and within a 3-month interval, in the same oncology unit. The initial presentation of facial pain was rapidly followed by the development of cranial nerve palsies, cavernous sinus thrombosis, diabetes insipidus, seizures and death within 9 days of symptom onset, despite aggressive management with high-dose liposomal amphotericin (Ambisome), surgical debridement and local instillation of amphotericin solution. These cases highlight the need for awareness of zygomycosis as a potentially lethal fungal infection that can present even with short duration exposure to the usual risk factors. Their occurrence within a limited time period raises questions as to the relative importance of environmental exposure. The failure of medical and surgical intervention to impact on the course illustrates the need to develop appropriate preventative strategies which may have to incorporate measures to reduce the environmental exposure of susceptible patients.
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Affiliation(s)
- M Ryan
- Department of Haematology and Oncology, Our Lady's Hospital for Sick Children, Crumlin, Dublin 12, Ireland
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Abstract
BACKGROUND Subtle cultural differences in the childbirth experience for expatriate Japanese couples living in southeast Michigan can sometimes cause conflicts between them and American health caregivers. The purpose of this study was to examine Japanese couples' perceptions and experiences of prenatal care and childbirth in a region of the United States, and to explore the implications for providing culturally competent care. METHODS In this qualitative study, in-depth interviews of 11 Japanese couples (n = 22) were conducted at an outpatient primary care clinic in southeast Michigan by a team of researchers fluent in the Japanese language and knowledgeable about the culture. Participants also completed a short questionnaire. RESULTS The major themes that emerged comprised perceptions related to a language barrier, ultrasonography, prenatal vitamin supplementation, episiotomy, epidural anesthesia, and practitioner-patient relationship. Throughout these six themes it was evident that Japanese health care professionals had difficulty accepting health care that was different from the care provided in their home country. CONCLUSION The most striking finding of this study was the difficulty for health caregivers to provide culturally competent care. Although the program has strongly invested in health professionals and support staff who were fluent in Japanese and knowledgeable about Japanese culture, conflicts still occurred.
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Affiliation(s)
- S Yeo
- University of Michigan, School of Nursing, Ann Arbor 48109-0482, USA
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Abstract
OBJECTIVE To review the literature on the circadian rhythm of blood pressure during pregnancy. DATA SOURCES Computerized searches on MEDLINE, CINAHL, and MIRLYN. STUDY SELECTION Selected studies from 1 969 to 1997 were evaluated. DATA EXTRACTION Data were extracted and information was organized under the following areas: definition of and the interconnection between circadian rhythm and blood pressure; the circadian variability of blood pressure throughout the trimesters; the patterns of the circadian rhythm of blood pressure in pregnancies defined as normal and those complicated by chronic hypertension and preeclampsia; and clinical implications. DATA SYNTHESIS The circadian rhythm of blood pressure in pregnancy is the same as in the non-pregnant state, with a nocturnal decrease, especially during sleep. In patients with chronic hypertension, the nocturnal fall in blood pressure may be steeper. Patients with mild preeclampsia may experience a less pronounced nocturnal decrease in blood pressure. Patients with severe preeclampsia may display a reversed circadian rhythm, with no decrease and/or an increase in nocturnal blood pressure. CONCLUSIONS The patterns of the circadian rhythm of blood pressure during normal pregnancy and pregnancies complicated by chronic hypertension and preeclampsia warrant consideration when monitoring patients and implementing management plans.
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Affiliation(s)
- C D Larry
- Henry Ford Hospital, Labor & Delivery Unit, Detroit, MI 48202-2689, USA
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Scisney-Matlock M, Algase D, Boehm S, Coleman-Burns P, Oakley D, Rogers AE, Yeo S, Young E, Yu MY. Measuring behavior: electronic devices in nursing studies. Appl Nurs Res 2000; 13:97-102. [PMID: 10842906 DOI: 10.1016/s0897-1897(00)80007-5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- M Scisney-Matlock
- University of Michigan School of Nursing, Ann Arbor 48109-0482, USA.
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Yeo S, Steele NM, Chang MC, Leclaire SM, Ronis DL, Hayashi R. Effect of exercise on blood pressure in pregnant women with a high risk of gestational hypertensive disorders. J Reprod Med 2000; 45:293-8. [PMID: 10804484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To prospectively determine whether moderate exercise during pregnancy lowers blood pressure. STUDY DESIGN A randomized, controlled trial with one test group and one control group. All subjects have a history of mild hypertension, gestational hypertensive disorders or a family history of hypertensive disorders. Subjects were recruited before 14 weeks' gestation. After four weeks of observation, the subjects were randomly assigned to either the exercise or control group. The exercise group visited the laboratory three times a week for 10 weeks (18-28 gestation weeks) to perform 30 minutes of exercise at Rating of Perceived Exertion level 13. RESULTS A total of 16 pregnant women (mean age, 30 years) participated. The mean metabolic equivalent during exercise sessions was 4.7 (SD = 0.8). Blood pressure measurements were compared before and after the 10-week exercise period in the two groups. Systolic blood pressures did not change significantly, but diastolic blood pressure (DBP) in the exercise group decreased by 3.5 mm Hg, while that in the control group increased by 1.1 mm Hg. Thus, the pre-post change in DBP differed by 4.6 mm Hg between groups. Exercise treatment reduced the diastolic blood pressure to a near-significant level in the exercise group (t = 2.34, df = 7, P = .052). Percent body fat did not differ between the exercise and control groups either before or after exercise treatment. ANOVA revealed that pregnancy had a significant effect (F(1, 14) = 5.7, P = .03) on increasing the percentage of fat, but exercise treatment did not (F(1, 14) = .18, P = .68). Estimated energy expenditure in overall daily physical activities during the intervention did not differ between the two groups despite the inclusion of exercise. CONCLUSION This study detected a strong trend that 10 weeks of moderate exercise lowered the diastolic blood pressure among pregnant women at risk of hypertensive disorders. The reductions were probably due to the effect of exercise itself, not to weight or overall daily physical activity levels.
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Affiliation(s)
- S Yeo
- Nursing School, University of Michigan School of Medicine, Ann Arbor 48109-0482, USA
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Abstract
OBJECTIVE To describe reported patterns of postpartum physical activity and to identify benefits or risks associated with postpartum physical activity at 6 weeks postpartum. DESIGN Secondary analysis of longitudinal data collected prenatally and postpartum in a study of obstetric outcomes at a midwestern tertiary-care center and its ambulatory satellite and hospital clinics. PARTICIPANTS One thousand three women completed a questionnaire at the 6-week postpartum clinic visit. Mean age was 29.7 years, and mean education level was 15.3 years. VARIABLES OF INTEREST Participation in vigorous exercise, change in postpartum activity level, postpartum weight retention, infant feeding method, maternal postpartum adaptation, and participation in activities for fun. RESULTS Nearly 35% reported doing vigorous exercise with a modal frequency of three times per week. More active women had retained significantly less weight (8.6 lb [3.9 kg]) than their less active counterparts (11.3 lb [5.1 kg]). Vigorous exercisers demonstrated a consistent pattern of better scores on measures of postpartum adaptation and were more likely than nonexercisers to participate in fun activities, such as socializing, hobbies, and entertainment. Breastfeeding was not adversely affected by vigorous exercise. CONCLUSIONS These exploratory results indicate that physical and psychologic benefits may accrue to postpartum women who are able to exercise vigorously and avoid decreasing their usual level of activity. A prospective randomized test of this relationship is warranted. Although positive outcomes of physical activity have been demonstrated in the population at large, exercise has rarely been an element in postpartum care plans. Nurses who care for women after childbirth should assess women's exercise goals and support them in their desired activities.
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Abstract
Mifepristone (RU-486) has recently been granted approval from the Food and Drug Administration for the early termination of pregnancy. Availability is anticipated during 1997. This article describes the pharmacologic function of mifepristone and discusses its potential clinical use in the United States, including its safety, efficacy, and possible complications.
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Affiliation(s)
- S Yeo
- Division II, School of Nursing, University of Michigan, Ann Arbor, USA
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Yeo S, Scarbough M. Exercise-induced hyperthermia may prevent accurate core temperature measurement by tympanic membrane thermometer. J Nurs Meas 1996; 4:143-51. [PMID: 9170781] [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: 02/04/2023]
Abstract
The purpose of this study was to assess the effect of exercise-induced hyperthermia on brain and deep trunk temperature measurement in order to determine the optimal temperature site of the body for varying nursing practices in outpatient clinical settings. Eight women, 18 to 50 years old (30.9 +/- 12.6; mean +/- SD), participated in the study. Subjects were asked to perform their regular aerobic exercise in a natural environment while body temperature (ear and rectal) and heart rate (HR) were measured simultaneously and repeatedly before, during, and after exercise. Glass mercury rectal thermometers were used for measurement of deep trunk temperature, an infrared tympanic membrane thermometer for measurement of brain temperature, and a portable heart rate monitor for monitoring heart rate. Rectal temperature was higher than ear temperature for all but one of the 40 pairs of observation. The time pattern varied for the two modes of temperature (F = 9.67; df 4,28; p < .001). Rectal temperature changed over time (F = 7.86; df 4,28; p < .002), and ear temperature did not (F = 1.5; df 4,28; p = .25), indicating that ear temperature did not respond to exercise. While rectal temperature was strongly correlated with HR (r = .60), ear temperature did not correlate either with rectal temperature (r = .02) or with HR (r = .08). Thus deep trunk temperature responds to exercise at moderate levels. On the other hand, ear temperature does not increase due to exercise. Ear temperature is not a valid indicator of trunk temperature during and immediately after exercise.
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Affiliation(s)
- S Yeo
- University of Michigan, USA
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45
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Abstract
OBJECTIVE To assess the accuracy of the tympanic membrane thermometer for use with pregnant women. DESIGN Cross-sectional descriptive study. SETTING A major medical center in the midwestern United States. PARTICIPANTS Thirty-three hospitalized, afebrile pregnant women. MAIN OUTCOME MEASURES Tympanic membrane thermometers and glass mercury thermometers were used to measure body temperature at the ear and rectum, respectively. The results were compared using two statistical methods: the Pearson correlation coefficient and a new technique suggested by Bland and Altman (1986). RESULTS Auditory canal temperature measured by a tympanic membrane thermometer correlated with rectal temperature as measured by a glass mercury thermometer (r = 0.38, p = 0.01). Thus, the tympanic membrane thermometer is acceptable for monitoring the body temperature of pregnant women. However, the device's estimation of rectal temperature is not clinically reliable. CONCLUSIONS Tympanic membrane thermometers, when applied with direct measures, are acceptable for use with pregnant women. It is not recommended that the rectal estimate mode be used with pregnant women.
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Affiliation(s)
- S Yeo
- Division of Health Promotion and Risk Reduction, University of Michigan School of Nursing, Ann Arbor 48109-0482, USA
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46
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Abstract
Despite remarkable improvements in high technologies and an increase in the number of studies related to exercise for pregnant women, the guidelines for maternal exercise remain contradictory. The effects of exercise in pregnant women and cardiovascular modifications due to pregnancy, and effects of maternal exercise on the fetal environment, including uterine and umbilical hemodynamic changes, are reviewed. Suggested future directions in this area of nursing science are discussed.
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Affiliation(s)
- S Yeo
- University of Michigan, School of Nursing, Ann Arbor, MI 48109-0482
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47
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Abstract
This study compares the attitudes toward breastfeeding of high-school students in Japan and the United States. The study was conducted as a cross-sectional survey with a convenience sample (N = 329). Data were collected in 1989 and 1990 at two private, girls-only high schools (Tokyo, Japan and Farmington, Michigan). Retrieval rates were 100 percent (Tokyo) and 78 percent (Michigan) respectively. Responses were compared by the chi-square (chi 2) test with Yate's correction and factor analyses. Tokyo students perceived that their mothers talked positively about breastfeeding (54 percent), while only 17 percent of Michigan students reported that their mothers did so (< .001). Less than five percent of the Tokyo students felt that breastfeeding disturbs family life, whereas nearly 98 percent of the Michigan students felt so (p < .001). Tokyo students scored significantly higher on the 'family' factor, while the Michigan students scored significantly higher on the 'self' factor. Overall, this study indicates that high school students in Japan have more positive attitudes toward breastfeeding than students in the United States; however, teenagers in the United States are more interested than their Japanese age-mates in gaining information about breastfeeding.
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48
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Yang X, Yeo S, Dick T, Chia W. The role of a Drosophila POU homeo domain gene in the specification of neural precursor cell identity in the developing embryonic central nervous system. Genes Dev 1993; 7:504-16. [PMID: 8095484 DOI: 10.1101/gad.7.3.504] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The Drosophila embryonic central nervous system (CNS) is derived from a stereotypic array of progenitor stem cells called neuroblasts (NBs). Each of the approximately 25 NBs per hemisegment undergoes repeated asymmetric divisions to produce, on average, 5-10 smaller ganglion mother cells (GMCs); each GMC, in turn, divides to produce two neurons. We demonstrate that the protein product encoded by a POU homeo domain gene (dPOU28/pdm-2) is expressed in the cell nuclei of a subset of NBs and GMCs. In the wild-type animal, GMC-1 is the only identified cell in the NB4-2 lineage that expresses dPOU28 protein to a high level, and it divides to produce the RP2 neuron and a second cell of unknown fate. Our results suggest that the presence of ectopically induced dPOU28/pdm-2 protein in the progeny of GMC-1 is sufficient to cause both of these cells to adopt their parental GMC-1 cell fate, leading to duplication of the RP2 neuron (and its sister cell) on the basis of both immunological and morphological criteria. These observations clearly implicate a role for dPOU28/pdm-2 in the specification of GMC-1 cell identity in the NB4-2 lineage and possibly in the specification of cell fate in other NB lineages in the developing embryonic CNS.
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Affiliation(s)
- X Yang
- Drosophila Neurobiology Laboratory, National University of Singapore
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49
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Abstract
A study of 85 incontinent female nursing home residents explored the effects of two nursing interventions (prompted voiding and socialization) on incontinence. Findings indicate that a controlled prompted voiding programme is useful in decreasing incontinent episodes. Positive effects of prompted voiding were noted over a 5-week experimental period. It is suggested that nursing homes incorporate prompted voiding into their care. Nursing homes adopting this protocol should be encouraged to keep data that will contribute further to knowledge in this area. Recommendations for additional research are made.
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Affiliation(s)
- N S Creason
- University of Illinois College of Nursing, Chicago
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50
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Abstract
Granulomatous lymphadenopathy, associated with the presence of needle-like refractile particles, was recognised in two dogs. The material was detected in macrophages, either free within the cytoplasm or in membrane-bound lysosomes. By mineral analysis under direct vision in an electron microscope microanalyser (EMMA 4) the particles were found to contain aluminosilicate.
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