| 1. |
- Arkblad, Eva L, et al.
(författare)
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A Caenorhabditis elegans mutant lacking functional nicotinamide nucleotide transhydrogenase displays increased sensitivity to oxidative stress.
- 2005
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Ingår i: Free radical biology & medicine. - : Elsevier BV. - 0891-5849. ; 38:11, s. 1518-25
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Tidskriftsartikel (refereegranskat)abstract
- Proton-translocating mitochondrial nicotinamide nucleotide transhydrogenase (NNT) was investigated regarding its physiological role in Caenorhabditis elegans. NNT catalyzes the reduction of NADP(+) by NADH driven by the electrochemical proton gradient, Deltap, and is thus a potentially important source of mitochondrial NADPH. Mitochondrial detoxification of reactive oxygen species (ROS) by glutathione-dependent peroxidases depends on NADPH for regeneration of reduced glutathione. Transhydrogenase may therefore be directly involved in the defense against oxidative stress. nnt-1 deletion mutants of C. elegans, nnt-1(sv34), were isolated and shown to grow essentially as wild type under normal laboratory conditions, but with a strongly lowered GSH/GSSG ratio. Under conditions of oxidative stress, caused by the superoxide-generating agent methyl viologen, growth of worms lacking nnt-1 activity was severely impaired. A similar result was obtained by using RNAi. Reintroducing nnt-1 in the nnt-1(sv34) knockout mutant led to a partial rescue of growth under oxidative stress conditions. These results provide evidence for the first time that nnt-1 is important in the defense against mitochondrial oxidative stress.
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| 2. |
- Hedhammar, My, et al.
(författare)
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A Novel flow cytometry-based method for analysis of expression levels in Escherichia coli, giving information about precipitated and soluble protein
- 2005
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Ingår i: Journal of Biotechnology. - : Elsevier BV. - 0168-1656 .- 1873-4863. ; 119:2, s. 133-146
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Tidskriftsartikel (refereegranskat)abstract
- A high throughput method for screening of protein expression is described. By using a flow cytometer, levels of both soluble and precipitated protein can simultaneously be assessed in vivo. Protein fragments were fused to the N-terminus of enhanced GFP and the cell samples were analysed using a flow cytometer. Data concerning whole cell fluorescence and light scattering was collected. The whole cell fluorescence is probing intracellular concentrations of soluble fusion proteins. Concurrently, forward scattered light gives data about inclusion body formation, valuable information in process optimisation. To evaluate the method, the cells were disrupted, separated into soluble and non-soluble fractions and analysed by gel electrophoresis. A clear correlation between fluorescence and soluble target protein was shown. Interestingly, the distribution of the cells regarding forward scatter (standard deviation) correlates with the amount of inclusion bodies formed. Finally, the newly developed method was used to evaluate two different purification tags, His(6) and Z(basic), and their effect on the expression pattern.
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| 3. |
- Lundström, Maria, et al.
(författare)
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Postoperative delirium in old patients with femoral neck fracture : a randomized intervention study.
- 2007
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Ingår i: Aging Clinical and Experimental Research. - 1594-0667 .- 1720-8319. ; 19:3, s. 178-186
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND AIMS: Delirium is a common postoperative complication in elderly patients which has a serious impact on outcome in terms of morbidity and costs. We examined whether a postoperative multi-factorial intervention program can reduce delirium and improve outcome in patients with femoral neck fractures.METHODS: One hundred and ninety-nine patients, aged 70 years and over (mean age+/-SD, 82+/-6, 74% women), were randomly assigned to postoperative care in a specialized geriatric ward or a conventional orthopedic ward. The intervention consisted of staff education focusing on the assessment, prevention and treatment of delirium and associated complications. The staff worked as a team, applying comprehensive geriatric assessment, management and rehabilitation. Patients were assessed using the Mini Mental State Examination and the Organic Brain Syndrome Scale, and delirium was diagnosed according to DSM-IV criteria.RESULTS: The number of days of postoperative delirium among intervention patients was fewer (5.0+/-7.1 days vs 10.2+/-13.3 days, p=0.009) compared with controls. A lower proportion of intervention patients were delirious postoperatively than controls (56/102, 54.9% vs 73/97, 75.3%, p=0.003). Eighteen percent in the intervention ward and 52% of controls were delirious after the seventh postoperative day (p<0.001). Intervention patients suffered from fewer complications, such as decubitus ulcers, urinary tract infections, nutritional complications, sleeping problems and falls, than controls. Total postoperative hospitalization was shorter in the intervention ward (28.0+/-17.9 days vs 38.0+/-40.6 days, p=0.028).CONCLUSIONS: Patients with postoperative delirium can be successfully treated, resulting in fewer days of delirium, fewer other complications, and shorter length of hospitalization.
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| 4. |
- Lundström, Maria, et al.
(författare)
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Symptom profile of postoperative delirium in patients with and without dementia
- 2012
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Ingår i: Journal of Geriatric Psychiatry and Neurology. - : Sage Publications. - 0891-9887 .- 1552-5708. ; 25:3, s. 162-169
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Tidskriftsartikel (refereegranskat)abstract
- This study compares the symptom profile of patients with postoperative delirium after femoral neck fracture surgery in those with and without dementia. In this study, 129 patients of age >= 70 years (mean age +/- SD, 86 +/- 6 yr, 72% women) with postoperative delirium, were included. Delirium and dementia were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition) criteria. Of the 129 patients with delirium, 54 (42%) had a dementia disorder. Patients with delirium superimposed on dementia more often had any hyperactive and pure emotional delirium. Communication difficulties and symptoms such as restlessness/agitation, aggressive behavior, and irritability were more commonly found in the dementia group. In contrast, patients with delirium but without dementia were more often diagnosed with pure hypoactive and any psychotic delirium. The symptom profile of postoperative delirium varies according to whether it occurs in patients with or without dementia. This may indicate that postoperative delirium among patients with hip fracture differs based on the presence or absence of dementia.
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| 5. |
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| 6. |
- Olofsson, Birgitta, et al.
(författare)
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Development of dementia in patients with femoral neck fracture who experience postoperative delirium : A three-year follow-up study
- 2018
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Ingår i: International Journal of Geriatric Psychiatry. - : John Wiley & Sons. - 0885-6230 .- 1099-1166. ; 33:4, s. 623-632
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Tidskriftsartikel (refereegranskat)abstract
- Objectives It remains unclear to what extent postoperative delirium (POD) affects the incidence of dementia in hip fracture patients, and the methods used to detect delirium and dementia require validation. The aim of this study was to investigate the development of dementia within 3 years of femoral neck fracture repair surgery, with a focus on POD as a potential predictive factor.Methods Patients were assessed for cognition, delirium, depression, psychological well-being, and nutritional status during their hospitalization as well as 4, 12, and 36 months after the operation. Logistic regression models were used to analyse factors associated with POD and factors associated with the development of dementia.Results The study sample consisted of 135 patients without a history of dementia, of whom 20 (14.8%) were delirious preoperatively and 75 (55.5%) postoperatively. Three years after their operations, 43/135 patients (31.8%) were diagnosed with dementia. A greater portion of patients diagnosed with dementia (39/43, 90.6%) than patients with no dementia (36/92, 39.1%) were included among the 75 patients who had experienced POD (P<0.001). In a logistic regression model, after adjustment for covariates (age, sex, diabetes, delirium pre- and postoperatively, hyperactive delirium, days with delirium, urinary tract infection, and Mini Nutritional Assessment score), POD emerged an independent predictor for the development of new dementia (odds ratio, 15.6; 95% confidence interval, 2.6-91.6) within 3 years after the operation.Conclusion Geriatric hip fracture patients who exhibit POD should be monitored closely for the development of dementia.
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| 7. |
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| 8. |
- Olofsson, Birgitta, et al.
(författare)
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Mental status and surgical methods in patients with femoral neck fracture
- 2009
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Ingår i: Orthopedic Nursing. - 0744-6020 .- 1542-538X. ; 28:6, s. 305-313
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: About one third of hip-fractured patients have dementia and thus may have difficulties adhering to postoperative instructions. Hip replacement is the most common treatment when a femoral neck fracture is displaced in healthy older people, whereas for those with dementia and other severe comorbidities, internal fixation (IF) is generally recommended.PURPOSE: To evaluate complications, functional outcome, and mortality for both surgical methods, IF and hemiarthroplasty (HAP), in older patients suffering from femoral neck fracture with or without dementia. SAMPLE: One hundred eighty patients, aged 70 years or older, who were operated on using IF (n = 69) in undisplaced femoral neck fracture and HAP (n = 111) if the fractures were displaced.DATA COLLECTION: Mental state was assessed using the Mini-Mental State Examination and Organic Brain Syndrome scale, and dementia and delirium were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition) criteria. Outcomes of mortality, complications, functional ability, and quality of life were measured.FINDINGS: There was no difference in complications or mortality at 4 months and 1 year for the IF or HAP groups. Patients with and without dementia, operated on with HAP, had a better functional outcome after 1 year than those operated on with IF. The result of this study indicates that dementia per se is not a reason for disqualifying those patients from the most appropriate surgical method.
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