| 1. |
- Samokhin, Alexander, et al.
(författare)
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Stationary iteration methods for solving 3D electromagnetic scattering problems
- 2013
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Ingår i: Applied Mathematics and Computation. - : Elsevier BV. - 0096-3003 .- 1873-5649. ; 222, s. 107-122
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Tidskriftsartikel (refereegranskat)abstract
- Generalized Chebyshev iteration (GCI) applied for solving linear equations with nonselfadjoint operators is considered. Sufficient conditions providing the convergence of iterations imposed on the domain of localization of the spectrum on the complex plane are obtained. A minimax problem for the determination of optimal complex iteration parameters is formulated. An algorithm of finding an optimal iteration parameter in the case of arbitrary location of the operator spectrum on the complex plane is constructed for the generalized simple iteration method. The results are applied to numerical solution of volume singular integral equations (VSIEs) associated with the problems of the mathematical theory of wave diffraction by 3D dielectric bodies. In particular, the domain of the spectrum location is described explicitly for low-frequency scattering problems and in the general case. The obtained results are discussed and recommendations concerning their applications are given. (C) 2013 Elsevier Inc. All rights reserved.
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| 2. |
- Söderpalm, Ann-Charlott, 1961, et al.
(författare)
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Low bone mineral density and decreased bone turnover in Duchenne muscular dystrophy
- 2007
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Ingår i: Neuromuscular Disorders. - : Elsevier BV. - 0960-8966 .- 1873-2364. ; 17:11-12, s. 919-928
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Tidskriftsartikel (refereegranskat)abstract
- This cross-sectional study examined bone mineral density, bone turnover, body composition and calciotropic hormones in 24 boys with Duchenne muscular dystrophy (DMD) (2.3-19.7 years), most of whom were being treated with prednisolone, and 24 age-matched healthy boys. Our study demonstrated lower bone mineral density in the DMD group for total body, spine, hip, heel and forearm measurements. These differences between DMD patients and controls increased with increasing age. Biochemical markers of both bone formation and resorption revealed reduced bone turnover in DMD patients. The fracture rate was not higher in DMD patients. The DMD group had low vitamin D levels but high leptin levels in comparison with the control group. Muscle strength correlated with bone mineral density assessed at the hip and heel in the DMD group. Interventions that increase bone formation should be considered, as DMD patients have reduced bone turnover in addition to their low bone mineral density. © 2007 Elsevier B.V. All rights reserved.
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| 3. |
- Baigi, Amir, 1953, et al.
(författare)
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Non-attendees' attitudes to the design of a cardiac rehabilitation programme focused on information of risk factors and professional involvement
- 2009
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Ingår i: European Journal of Cardiovascular Nursing. - Amsterdam : Elsevier. - 1474-5151 .- 1873-1953. ; 8:1, s. 62-66
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Tidskriftsartikel (refereegranskat)abstract
- Background: Enhancing the accuracy of the content of cardiac rehabilitation programmes (CRPs) and providing the mediators preferred by patients can increase attendance rates in line with secondary prevention goals. The aim of this study was therefore to explore non-attendees' attitudes to the design of a CRP focused on information of risk factors and professional involvement. Method: Consecutive patients with coronary heart disease (n = 100) who declined to participate in a CRP answered a questionnaire focusing on patients' attitudes to risk factors and cardiac rehabilitation. Results: Non-attendees considered that information of hypertension and information of sedentary lifestyle constituted the most important content of a CRP. Physicians, nurses and social workers were considered the most suitable professional categories. Females preferred nurses when discussing smoking issues while males preferred physicians. More males compared to females preferred occupational therapists for dealing with stress, physicians for depression and social workers for social isolation. Conclusions: Non-attendees' attitudes are similar to those of attendees and quite traditional in that they favour physician or nurse-led activities. There is a difference in attitude between male and female.
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| 4. |
- Karlsson, Ann-Kristin, 1953, et al.
(författare)
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Depressed mood over time after open heart surgery impacts patient well-being: A combined study
- 2008
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Ingår i: European Journal of Cardiovascular Nursing. - Amsterdam : Oxford University Press (OUP). - 1474-5151 .- 1873-1953. ; 7:4, s. 277-283
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Tidskriftsartikel (refereegranskat)abstract
- Background: Depression is a common cause of decreased well-being after open heart surgery (OHS) and a risk factor for new cardiac events. Little is known about the long-term prevalence of depressive symptoms after OHS or their effect on well-being. The aim of this study was to explore the presence of depressed mood in patients during the recovery phase after open heart surgery as well as depressed mood and well-being 3 years later. Method: Eighty consecutively included patients completed a questionnaire about depressed mood at 5 weeks, 5 months and 3 years after OHS. A telephone interview took place after receipt of the third questionnaire to explore their well-being. Quantitative and qualitative data were analysed separately and thereafter together. Result: Depressed mood occurred in 52% of the patients during recovery or 3 years after OHS. The qualitative content analysis produced the theme of transition, which was based on three categories. Conclusion: Depressed mood was reported by the majority of patients during recovery after OHS and had a long-term effect on their well-being. OHS constituted a transition for all patients, but those with depressed mood had difficulty finishing the transition process and reorientating life.
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| 5. |
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| 6. |
- Franzén, Kristofer, et al.
(författare)
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Impact of chronic heart failure on elderly persons' daily life : a validation study
- 2006
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Ingår i: European Journal of Cardiovascular Nursing. - : Sage Publications. - 1474-5151 .- 1873-1953. ; 5:2, s. 137-145
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Knowledge about how elderly persons perceive the impact of chronic heart failure (CHF) on daily life is important when planning nursing care. For this purpose, disease specific instruments are needed. However, few instruments have been developed or tested specifically on elderly persons. AIM: To validate a Swedish version of the Minnesota Living with Heart Failure Questionnaire (LHFQ) on elderly persons with CHF, and use it to describe the impact of CHF on daily life in the same population. METHODS: The sample comprised of 357 persons, aged between 65 and 99, diagnosed with CHF. A questionnaire including background data, the LHFQ and the SF-12 was used. RESULTS: A factor analysis resulted in four dimensions: physical, emotional, treatment and pleasure. LHFQ showed convergent validity and ability to discriminate between known groups. Cronbach's alpha for the total scale was 0.94. Impairments in the physical dimension were most common, especially fatigue (88%) and shortness of breath (87%). CONCLUSIONS: The LHFQ showed satisfying psychometric properties in an elderly Swedish population with CHF and can, with minor alterations, be recommended for research and clinical use. The impact of chronic heart failure on daily life was mostly physical, but other impairments were also common.
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| 7. |
- Franzén, Kristofer, et al.
(författare)
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Predictors for health related quality of life in persons 65 years or older with chronic heart failure
- 2007
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Ingår i: European Journal of Cardiovascular Nursing. - : Oxford University Press. - 1474-5151 .- 1873-1953. ; 6:2, s. 112-120
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundA main goal in nursing care of persons with chronic heart failure (HF) is to strengthen their health related quality of life (HRQoL). This presupposes knowledge about the relation between heart failure and HRQoL. Existing studies have shown incongruent results about whether HRQoL is affected differently depending on age or sex of elderly persons with chronic HF.AimThis study aimed to investigate if age, sex, disease severity, comorbidity and living conditions predict health related quality of life among persons 65 years or older with chronic HF.MethodsThe study included a sample of 357 persons. HRQoL was measured by the Minnesota Living with Heart Failure Questionnaire and the Short Form-12 Health Survey Questionnaire. Multiple regression analyses were performed to analyse the relation between the predictors and HRQoL.ResultsThe main finding was that self-rated disease severity was strongly associated with HRQoL, but also age, sex, diabetes and respiratory diseases was associated with some of the dimensions of HRQoL.ConclusionsInterventions aimed at delaying the progress of the disease, assist persons' to cope with the disease and maintain the domains of HRQoL that are still feasible could be important to improve HRQoL in elderly persons with chronic HF.
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| 8. |
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| 9. |
- Johansson, Ingvor, et al.
(författare)
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Disturbed sleep, fatigue, anxiety and depression in myocardial infarction patients
- 2010
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Ingår i: European Journal of Cardiovascular Nursing. - : Oxford University Press (OUP). - 1474-5151 .- 1873-1953. ; 9:3, s. 175-180
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Tidskriftsartikel (refereegranskat)abstract
- Background: Disturbed sleep has been linked to increased morbidity, mortality and depression and worsened health-related quality of life in patients with chronic illness. Few studies of readjustment after coronary artery disease have explicitly focused on sleep disturbance. Aim: To explore associations between disturbed sleep, fatigue, anxiety and depression, and to assess to what extent fatigue four months post-MI could be explained. Method: The sample included 204 consecutive patients, ≤ 80 years of age who answered questionnaires about disturbed sleep, fatigue, anxiety and depression four months after MI. Results: The variables anxiety, depression and disturbed sleep were all associated with fatigue. The regression model accounted for 46% of the variance in fatigue with depression and disturbed sleep as predictors. Infarct size measured by conventional biochemical markers, left ventricle ejection fraction and history of previous MI were not correlated with disturbed sleep, fatigue, anxiety or depression. Conclusions: From knowledge about associations between disturbed sleep, fatigue, anxiety and depression after MI, cardiac nurses could be trained to observe such symptoms. Optimal care for sleep disturbance may include actions to reduce anxiety and depression as well as self-care advices about sleep hygiene in order to improve sleep quality and reduce fatigue. © 2009 European Society of Cardiology.
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