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Wong A, Huang Y, Banks MD, Sowa PM, Bauer JD. A Conceptual Study on Characterizing the Complexity of Nutritional Interventions for Malnourished Older Adults in Hospital Settings: An Umbrella Review Approach. Healthcare (Basel) 2024; 12:765. [PMID: 38610187 PMCID: PMC11011329 DOI: 10.3390/healthcare12070765] [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: 01/23/2024] [Revised: 03/28/2024] [Accepted: 03/29/2024] [Indexed: 04/14/2024] Open
Abstract
INTRODUCTION Malnutrition is a widespread and intricate issue among hospitalized adults, necessitating a wide variety of nutritional strategies to address its root causes and repercussions. The primary objective of this study is to systematically categorize nutritional interventions into simple or complex, based on their resource allocation, strategies employed, and predictors of intervention complexity in the context of adult malnutrition in hospital settings. METHODS A conceptual evaluation of 100 nutritional intervention studies for adult malnutrition was conducted based on data from a recent umbrella review (patient population of mean age > 60 years). The complexity of interventions was categorized using the Medical Research Council 2021 Framework for Complex Interventions. A logistic regression analysis was employed to recognize variables predicting the complexity of interventions. RESULTS Interventions were divided into three principal categories: education and training (ET), exogenous nutrient provision (EN), and environment and services (ES). Most interventions (66%) addressed two or more of these areas. A majority of interventions were delivered in a hospital (n = 75) or a hospital-to-community setting (n = 25), with 64 studies being classified as complex interventions. The logistic regression analysis revealed three variables associated with intervention complexity: the number of strategies utilized, the targeted areas, and the involvement of healthcare professionals. Complex interventions were more likely to be tailored to individual needs and engage multiple healthcare providers. CONCLUSIONS The study underlines the importance of considering intervention complexity in addressing adult malnutrition. Findings advocate for a comprehensive approach to characterizing and evaluating nutritional interventions in future research. Subsequent investigations should explore optimal balances between intervention complexity and resource allocation, and assess the effectiveness of complex interventions across various settings, while considering novel approaches like telehealth.
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Affiliation(s)
- Alvin Wong
- Department of Dietetics, Changi General Hospital, 2 Simei Street 3, Singapore 529889, Singapore
| | - Yingxiao Huang
- School of Human Movement and Nutrition Sciences, University of Queensland, St. Lucia, QLD 4072, Australia
| | - Merrilyn D. Banks
- Centre for the Business and Economics of Health, The University of Queensland, St. Lucia, QLD 4067, Australia
| | - P. Marcin Sowa
- Department of Nutrition and Dietetics, Royal Brisbane and Women’s Hospital, Herston, QLD 4029, Australia
| | - Judy D. Bauer
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, VIC 3168, Australia
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Wong A, Goh G, Banks MD, Bauer JD. A systematic review of the cost and economic outcomes of home enteral nutrition. Clin Nutr 2017; 37:429-442. [PMID: 28679469 DOI: 10.1016/j.clnu.2017.06.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [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: 01/09/2017] [Revised: 05/08/2017] [Accepted: 06/14/2017] [Indexed: 01/08/2023]
Abstract
OBJECTIVES Studies are lacking in the health economic implications of home enteral nutrition (HEN) in home-residing and long-term care/institutionalized patients. The aims of this review were to determine the total costs, the cost-effectiveness and other economic outcomes for HEN. DESIGN A systematic search of randomized trials and observational studies available from January 2000 to April 2016 was performed using standard literature and electronic databases. Inclusion criteria were adults receiving HEN with economic outcomes in the long-term care or home settings. There was no restriction to the control groups used in the studies. RESULTS A total of 10 studies met the inclusion criteria. The majority of the studies were not specifically designed for economic evaluation. Cost per QALY was lower in residents residing in home compared to long-term care facilities, and HEN appeared to be cost-effective for those with pressure ulcers. Higher costs were incurred for patients with dementia on HEN. Lower hospitalization costs and infection rates were reported for patients who switched to commercial feeds from blenderized food. The availability of nutritional support teams may decrease overall costs but these studies were of poor study quality. CONCLUSIONS The lack of good quality economic evaluation studies affected the ability to conclude the overall cost-effectiveness of HEN. There is a trend for cost-saving and improved clinical outcomes in some populations. HEN is unlikely beneficial for patients with dementia. The availability of a nutrition support team may lead to cost savings and improved clinical outcomes for HEN.
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Affiliation(s)
- A Wong
- Dietetic and Food Services, Changi General Hospital, Singapore; School of Human Movement and Nutrition Sciences, University of Queensland, St. Lucia, Australia.
| | - G Goh
- Health Services Research, Eastern Health Alliance, Singapore
| | - M D Banks
- Royal Brisbane and Women's Hospital, Department of Nutrition and Dietetics, Queensland, Australia
| | - J D Bauer
- School of Human Movement and Nutrition Sciences, University of Queensland, St. Lucia, Australia
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Brown T, Banks M, Hughes BGM, Lin C, Kenny LM, Bauer JD. New radiotherapy techniques do not reduce the need for nutrition intervention in patients with head and neck cancer. Eur J Clin Nutr 2015; 69:1119-24. [PMID: 26306565 DOI: 10.1038/ejcn.2015.141] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 07/15/2015] [Accepted: 07/21/2015] [Indexed: 11/09/2022]
Abstract
BACKGROUND/OBJECTIVES Since 2007, our institution has used validated guidelines for the insertion of proactive gastrostomy feeding tubes in patients with head and neck cancer. Helical intensity-modulated radiotherapy (H-IMRT) delivered by Tomotherapy, is an advanced radiotherapy technique introduced at our centre in 2010. This form of therapy reduces long-term treatment-related toxicity to normal tissues. The aim of this study is to compare weight change and need for tube feeding following H-IMRT (n=53) with patients that would have previously been treated with three-dimensional conformal radiotherapy (n=134). SUBJECTS/METHODS Patients with head and neck cancer assessed as high nutritional risk with recommendation for proactive gastrostomy were identified from cohorts from 2007 to 2008 and 2010 to 2011. Retrospective data were collected on clinical factors, weight change from baseline to completion of treatment, incidence of severe weight loss (⩾ 10%) and tube feeding. Statistical analyses to compare outcomes between the two treatments included χ(2)-test, Fisher's exact and two-sample Wilcoxon tests (P<0.05). RESULTS The H-IMRT cohort had higher proportions of patients with definitive chemoradiotherapy (P=0.032) and more advanced N stage (P<0.001). Nutrition outcomes were not significantly different between H-IMRT and conformal radiotherapy, respectively: need for proactive gastrostomy (n=49, 92% versus n=115, 86%, P=0.213), median percentage weight change (-7.2% versus -7.3%, P=0.573) and severe weight loss incidence (28% versus 27%, P=0.843). CONCLUSIONS Both groups had median weight loss >5% and high incidences of tube feeding and severe weight loss. Nutrition intervention remains critical in this patient population, despite advances in radiotherapy techniques, and no changes to current management are recommended.
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Affiliation(s)
- T Brown
- Centre for Dietetics Research (C-DIET-R), School of Human Movement and Nutrition Sciences, University of Queensland, St Lucia, Queensland, Australia.,Department of Nutrition and Dietetics, Royal Brisbane and Women's Hospital, Herston, Queensland, Australia
| | - M Banks
- Department of Nutrition and Dietetics, Royal Brisbane and Women's Hospital, Herston, Queensland, Australia
| | - B G M Hughes
- Cancer Care Services, Royal Brisbane and Women's Hospital, Herston, Queensland, Australia.,School of Medicine, University of Queensland, St Lucia, Queensland, Australia
| | - C Lin
- Cancer Care Services, Royal Brisbane and Women's Hospital, Herston, Queensland, Australia
| | - L M Kenny
- Cancer Care Services, Royal Brisbane and Women's Hospital, Herston, Queensland, Australia
| | - J D Bauer
- Centre for Dietetics Research (C-DIET-R), School of Human Movement and Nutrition Sciences, University of Queensland, St Lucia, Queensland, Australia
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Graziani FR, Bauer JD, Murillo MS. Kinetic theory molecular dynamics and hot dense matter: theoretical foundations. Phys Rev E Stat Nonlin Soft Matter Phys 2014; 90:033104. [PMID: 25314544 DOI: 10.1103/physreve.90.033104] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Indexed: 06/04/2023]
Abstract
Electrons are weakly coupled in hot, dense matter that is created in high-energy-density experiments. They are also mildly quantum mechanical and the ions associated with them are classical and may be strongly coupled. In addition, the dynamical evolution of plasmas under these hot, dense matter conditions involve a variety of transport and energy exchange processes. Quantum kinetic theory is an ideal tool for treating the electrons but it is not adequate for treating the ions. Molecular dynamics is perfectly suited to describe the classical, strongly coupled ions but not the electrons. We develop a method that combines a Wigner kinetic treatment of the electrons with classical molecular dynamics for the ions. We refer to this hybrid method as "kinetic theory molecular dynamics," or KTMD. The purpose of this paper is to derive KTMD from first principles and place it on a firm theoretical foundation. The framework that KTMD provides for simulating plasmas in the hot, dense regime is particularly useful since current computational methods are generally limited by their inability to treat the dynamical quantum evolution of the electronic component. Using the N-body von Neumann equation for the electron-proton plasma, three variations of KTMD are obtained. Each variant is determined by the physical state of the plasma (e.g., collisional versus collisionless). The first variant of KTMD yields a closed set of equations consisting of a mean-field quantum kinetic equation for the electron one-particle distribution function coupled to a classical Liouville equation for the protons. The latter equation includes both proton-proton Coulombic interactions and an effective electron-proton interaction that involves the convolution of the electron density with the electron-proton Coulomb potential. The mean-field approach is then extended to incorporate equilibrium electron-proton correlations through the Singwi-Tosi-Land-Sjolander (STLS) ansatz. This is the second variant of KTMD. The STLS contribution produces an effective electron-proton interaction that involves the electron-proton structure factor, thereby extending the usual mean-field theory to correlated but near equilibrium systems. Finally, a third variant of KTMD is derived. It includes dynamical electrons and their correlations coupled to a MD description for the ions. A set of coupled equations for the one-particle electron Wigner function and the electron-electron and electron-proton correlation functions are coupled to a classical Liouville equation for the protons. This latter variation has both time and momentum dependent correlations.
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Affiliation(s)
- F R Graziani
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J D Bauer
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M S Murillo
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
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Hung YC, Bauer JD, Horsely P, Coll J, Bashford J, Isenring EA. Telephone-delivered nutrition and exercise counselling after auto-SCT: a pilot, randomised controlled trial. Bone Marrow Transplant 2014; 49:786-92. [PMID: 24710562 DOI: 10.1038/bmt.2014.52] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 01/24/2014] [Accepted: 01/29/2014] [Indexed: 01/11/2023]
Abstract
Adverse changes in nutrition-related outcomes including quality of life (QoL) occur after PBSC transplantation. This randomised controlled trial aims to evaluate the impact of nutrition and exercise counselling provided at hospital discharge on nutritional status, body composition and QoL post transplantation. Usual care (UC) (n=19) received no intervention after discharge; extended care (EC) (n=18) received fortnightly telephone counselling from a dietitian and exercise physiologist up to 100 days post transplantation. Nutritional status (patient-generated subjective global assessment, and diet history), QoL (EORTC QLQ-C30 version 3) and body composition (air displacement plethysmography) were assessed at pre-admission, discharge and 100 days post transplantation. Intervention groups were compared using two-sample t-tests of changes in the outcomes; results were adjusted using analysis of covariance. EC exhibited clinically important but not statistically significant increases in protein intake (14.7 g; confidence interval (CI) 95% -6.5, 35.9, P=0.165), cognitive functioning (7.2; CI 95% -7.9, 22.2, P=0.337) and social functioning (16.5; CI 95% -7.3, 40.3, P=0.165) compared with UC. Relative to pre-admission, EC experienced less weight loss than UC (-3.3 kg; CI 95% -6.7, 0.2, P=0.062). Physical activity was not significantly different between the groups. Ongoing nutrition and exercise counselling may prevent further weight loss and improve dietary intake and certain QoL components in autologous PBSC transplantation patients following hospitalisation.
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Affiliation(s)
- Y-C Hung
- Centre for Dietetics Research, School of Human Movement Studies, The University of Queensland, Brisbane, Queensland, Australia
| | - J D Bauer
- 1] Centre for Dietetics Research, School of Human Movement Studies, The University of Queensland, Brisbane, Queensland, Australia [2] The Wesley Research Institute, Brisbane, Queensland, Australia
| | - P Horsely
- The Wesley Research Institute, Brisbane, Queensland, Australia
| | - J Coll
- The Wesley Research Institute, Brisbane, Queensland, Australia
| | - J Bashford
- Haematology & Oncology Clinics of Australia, The Wesley Medical Centre, Brisbane, Queensland, Australia
| | - E A Isenring
- 1] Centre for Dietetics Research, School of Human Movement Studies, The University of Queensland, Brisbane, Queensland, Australia [2] Department of Nutrition & Dietetics, Princess Alexandra Hospital, Brisbane, Queensland, Australia
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Bell JJ, Bauer JD, Capra S, Pulle RC. Concurrent and predictive evaluation of malnutrition diagnostic measures in hip fracture inpatients: a diagnostic accuracy study. Eur J Clin Nutr 2014; 68:358-62. [DOI: 10.1038/ejcn.2013.276] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 11/20/2013] [Accepted: 11/21/2013] [Indexed: 01/03/2023]
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Abstract
BACKGROUND The Malnutrition Screening Tool (MST) is the most commonly used screening tool in Australia. Poor screening tool sensitivity may lead to an under-diagnosis of malnutrition, with potential patient and economic ramifications. The present study aimed to determine whether the MST or anthropometric parameters adequately detect malnutrition in patients who were admitted to a hip fracture unit. METHODS Data were analysed for a prospective convenience sample (n = 100). MST screening was independently undertaken by nursing staff and a nutrition assistant. Mid upper arm circumference (MUAC) was measured by a trained nutrition assistant. Nutritional risk [MST score ≥ 2, body mass index (BMI) < 22 kg m(-2) , or MUAC < 25 cm] was compared with malnutrition diagnosed by accredited practicing dietitians using International Classification of Diseases version 10-Australian Modification (ICD10-AM) coding criteria. RESULTS Malnutrition prevalence was 37.5% using ICD10-AM criteria. Delirium, dementia or preadmission cognitive impairment was present in 65% of patients. The BMI as a nutrition risk screen was the most valid predictor of malnutrition (sensitivity 75%; specificity 93%; positive predictive value 73%; negative predictive value 84%). Nursing MST screening was the least valid (sensitivity 73%; specificity 55%; positive predictive value 50%; negative predictive value 77%). There was only fair agreement between nursing and nutrition assistant screening using the MST (κ = 0.28). CONCLUSIONS In this population with a high prevalence of delirium and dementia, further investigation is warranted into the performance of nutrition screening tools and anthropometric parameters such as BMI. All tools failed to predict a considerable number of patients with malnutrition. This may result in the under-diagnosis and treatment of malnutrition, leading to case-mix funding losses.
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Affiliation(s)
- J J Bell
- Department of Nutrition and Dietetics, The Prince Charles Hospital, Queensland Health, Brisbane, Queensland, Australia; Centre for Dietetics Research, School of Human Movement Studies, University of Queensland, Brisbane, Queensland, Australia
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Winkler B, Haussühl E, Bauer JD, Schröder F, Refson K, Milman V, Hennion B, Bossak A, Krisch M. Influence of deuteration on lithium acetate dihydrate studied by inelastic X-ray scattering, density functional theory, thermal expansion, elastic and thermodynamic measurements. Dalton Trans 2011; 40:1737-42. [PMID: 21258673 DOI: 10.1039/c0dt01302a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of deuteration on the properties of lithium acetate dihydrate has been investigated by thermal expansion measurements, ultrasound spectroscopy and calorimetry. Inelastic X-ray scattering has been employed to investigate if the low temperature structural phase transition can be detected by a change in the vibrational spectrum. Density functional theory, DFT, calculations have been employed to complement the experimental investigations. The thermal expansion coefficients and the specific heat of the deuterated compound differ significantly from the protonated form. The differences in the elastic stiffness coefficients are just above the detection limit of the technique employed here. Temperature dependent inelastic X-ray spectroscopic measurements show no significant change of the vibrational spectrum when crossing the transition temperature. The DFT calculations show that the methyl group dynamics are best described in the framework of coupled rotators of opposing methyl groups. One of the coupled rotational modes corresponds to a hindered rotator with a barrier of 15 meV, while the other is a free rotator.
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Affiliation(s)
- B Winkler
- Goethe-Universität Frankfurt am Main, Institut für Geowissenschaften, Abt. Kristallographie, Altenhöferallee 1, 60438, Frankfurt am Main, Germany.
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Gaskill D, Isenring EA, Black LJ, Hassall S, Bauer JD. Maintaining nutrition in aged care residents with a train-the-trainer intervention and Nutrition Coordinator. J Nutr Health Aging 2009; 13:913-7. [PMID: 19924353 DOI: 10.1007/s12603-009-0251-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [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: 03/02/2009] [Accepted: 03/12/2009] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To investigate the impact of a train-the-trainer program on the nutritional status of older people in residential care. DESIGN Prospective, randomized controlled study. SETTING Eight nursing homes in Southeast Queensland, Australia. PARTICIPANTS A total of 352 residents participated - 245 were female (69.6%). The mean age was 84.2 years and the majority (79.4%) were classified as high dependency. INTERVENTION Residents from four nursing homes were randomly selected for a nutrition education program coordinated by Nutrition Coordinators. Residents from the other four nursing homes (control) received usual care. MEASUREMENTS The Subjective Global Assessment was used to determine prevalence of malnutrition at baseline and six months post intervention. The Resident Classification Scale measured functional dependency. Prescribed diet, fluids, oral hygiene status and allied health referrals were obtained by chart audit. RESULTS Approximately half the residents were well nourished with 49.4% moderately or severely malnourished. Residents in the intervention group were more likely to maintain or improve their nutritional status compared with the control group who were more likely to experience a deterioration (P=0.027). The odds of the control group being malnourished post test was 1.6 times more likely compared with the intervention group but this did not reach statistical significance (P=0.1). CONCLUSION The results of the study encourage the implementation of a Nutrition Coordinator program to maintain nutritional status of aged care residents. Nevertheless, malnutrition rates continue to be unacceptably high. In a rapidly aging society, the aged care sector needs to confront malnutrition and provide better resources for staff to take measures against this problem.
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Affiliation(s)
- D Gaskill
- School of Nursing & Midwifery, Queensland University of Technology, Brisbane, Australia.
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Bauer JD, Jackson A, Skwarchuk M, Zelefsky M. Principal component, Varimax rotation and cost analysis of volume effects in rectal bleeding in patients treated with 3D-CRT for prostate cancer. Phys Med Biol 2006; 51:5105-23. [PMID: 17019028 DOI: 10.1088/0031-9155/51/20/003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We investigate the utility of principal component analysis as a tool for obtaining dose-volume combinations related to rectal bleeding after radiotherapy for prostate cancer. A direct implementation of principal component analysis reduces the number of degrees of freedom from the patient's dose-volume histograms that are associated with bleeding. However, when low-variance principal components are strongly correlated to outcome, their interpretation is problematic. A Varimax rotation is employed to aid in interpretability of the low-variance principal components. This procedure brings us closer to finding unique dose-volume combinations related to outcome but reintroduces correlation, requiring analysis of the overlap of information contained in such modes. Finally, we present examples of cost-benefit analyses for candidate dose-volume constraints for use in treatment planning.
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Affiliation(s)
- J D Bauer
- Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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Isenring EA, Capra S, Bauer JD. Nutrition intervention is beneficial in oncology outpatients receiving radiotherapy to the gastrointestinal or head and neck area. Br J Cancer 2004; 91:447-52. [PMID: 15226773 PMCID: PMC2409852 DOI: 10.1038/sj.bjc.6601962] [Citation(s) in RCA: 325] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Malnutrition occurs frequently in patients with cancer of the gastrointestinal (GI) or head and neck area and can lead to negative outcomes. The aim of this study is to determine the impact of early and intensive nutrition intervention (NI) on body weight, body composition, nutritional status, global quality of life (QoL) and physical function compared to usual practice in oncology outpatients receiving radiotherapy to the GI or head and neck area. Outpatients commencing at least 20 fractions of radiotherapy to the GI or head and neck area were randomised to receive intensive, individualised nutrition counselling by a dietitian using a standard protocol and oral supplements if required, or the usual practice of the centre (general advice and nutrition booklet). Outcome parameters were measured at baseline and 4, 8 and 12 weeks after commencing radiotherapy using valid and reliable tools. A total of 60 patients (51M : 9F; mean age 61.9±14.0 years) were randomised to receive either NI (n=29) or usual care (UC) (n=31). The NI group had statistically smaller deteriorations in weight (P<0.001), nutritional status (P=0.020) and global QoL (P=0.009) compared with those receiving UC. Clinically, but not statistically significant differences in fat-free mass were observed between the groups (P=0.195). Early and intensive NI appears beneficial in terms of minimising weight loss, deterioration in nutritional status, global QoL and physical function in oncology outpatients receiving radiotherapy to the GI or head and neck area. Weight maintenance in this population leads to beneficial outcomes and suggests that this, rather than weight gain, may be a more appropriate aim of NI.
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Affiliation(s)
- E A Isenring
- School of Public Health, Queensland University of Technology, Brisbane, Australia.
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Back CA, Bauer JD, Landen OL, Turner RE, Lasinski BF, Hammer JH, Rosen MD, Suter LJ, Hsing WH. Detailed measurements of a diffusive supersonic wave in a radiatively heated foam. Phys Rev Lett 2000; 84:274-277. [PMID: 11015889 DOI: 10.1103/physrevlett.84.274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/1999] [Indexed: 05/23/2023]
Abstract
We have made the first detailed measurements of a diffusive supersonic radiation wave in the laboratory. A 10 mg/cm(3) SiO2 foam is radiatively heated by the x-ray flux from a laser-irradiated hohlraum. The resulting radiation wave propagates axially through the optically thick foam and is measured via time-resolved x-ray imaging as it breaks out the far end. The data show that the radiation wave breaks out at the center prior to breaking out at the edges, indicating a significant curvature in the radiation front. This curvature is primarily due to energy loss into the walls surrounding the foam.
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Affiliation(s)
- CA Back
- Lawrence Livermore National Laboratory, L-21, P.O. Box 808, Livermore, California 94551, USA
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Bauer JD, Back CA, Castor JI, Dykema PG, Hammel BA, Lee RW, Nash JK, Seely JF, Feldman U, Brown CM. Simulation and analysis of an x-ray-heated boron nitride foil. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1995; 52:6736-6752. [PMID: 9964189 DOI: 10.1103/physreve.52.6736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bauer JD, Graziani FR. Statistical closure and the logistic map. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1994; 49:192-198. [PMID: 9961206 DOI: 10.1103/physreve.49.192] [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: 05/22/2023]
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Carmichael JW, Bauer JD, Hunter JR, Labat DD, Sevenair JP. An assessment of a premedical program in terms of its ability to serve black Americans. J Natl Med Assoc 1988; 80:1094-104. [PMID: 3249314 PMCID: PMC2625875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
If special programs to increase the number of blacks gaining entry into health professional schools can identify whom they best serve, changes in either the selection process or the curriculum can increase their effectiveness. As one part of an evaluation of the effectiveness of the various components of the prehealth professions program at Xavier University of Louisiana (XU), black freshmen entering the university from 1981 to 1983 in the university's premedical program were tracked to determine who gained entry into medical and related mainline health professional schools upon graduation.The analyses indicate that high-ability black freshmen entering Xavier are more than twice as likely to gain admission into medical school than are their black counterparts nationally, and that this difference is statistically significant beyond the 99 percent level. Fifty-seven percent of high-ability black freshmen (those with American College Testing [ACT] composite scores of 24 or above, the top 2 percent of blacks nationally) who entered XU's biology or chemistry programs during the period under study gained entry into medical school upon graduation, whereas a study by the Educational Testing Service indicates that only 24 percent of similar blacks nationally gain entry into any graduate or professional school.The present study suggests that XU's premedical program serves those blacks who are not in the high-ability group (those whose ACT scores are below 24) at least as well (relative to the national average) as it does the top students. It therefore seems reasonable to assume that XU's premedical program is successful because it increases the probability that students gain admission into health professional schools rather than because of any preselection of students. These results are similar to those obtained from a comparable analysis of XU's prepharmacy program, the other component of prehealth at Xavier.
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