140 results on '"Lohela P"'
Search Results
2. Exploring stakeholders’ perceived problems associated with the care and support of children and youth with mental ill health in Sweden: a qualitative study
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Malin Helander, Mio Fredriksson, and Malin Lohela-Karlsson
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Collaboration ,Inter-organizational ,Mental ill health ,Stakeholders ,Children and youth ,Perceived problems ,Nutritional diseases. Deficiency diseases ,RC620-627 ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Care and support for children and youth with mental ill health have become more specialized and are provided by an increasing number of stakeholders. As a result, services are often fragmented, inefficient and unco-ordinated, with negative consequences for the service user and their family. Enhanced collaboration could lead to improved care and support but requires a shared understanding and a joint problem formulation between involved stakeholders to commence. The aim of this study was to explore different stakeholders’ perceived problems associated with delivering care and support to children and youth with mental ill health and to discuss how the perceived problems relate to collaboration. Methods A qualitative descriptive study was conducted, using short statements of perceived problems written by stakeholders involved in the care and support of children and youth with mental ill health during an inter-organizational workshop. The 26 stakeholders represented school and student health, primary health care, specialist care, social services, and different service user organizations. Data were collected during February 2020. Inductive content analysis with a summative approach was used when analysing the data. Results The perceived problems were summarized in a model consisting of four main categories: Resources and governance; Collaboration and co-ordination; Knowledge and competence; and Stigma and confidence, containing 24 subcategories. These categories and subcategories were distributed over three levels: Societal level, Organizational level and Individual level. The perceived problems were shared on the category level but to some extent varied between stakeholder groups on the subcategory level. The perceived problems were either directly or indirectly related to collaboration. Conclusions The perceived problems often acted as barriers to achieving successful collaboration. The problems were distributed on all three levels in the developed model, indicating a complex problem. Even though the perceived problems were shared by stakeholders on an overall level, the findings indicate that the stakeholders did not have a completely shared understanding of the perceived problems, as they tended to focus on aspects most relevant to their own organization or perceptions. The challenge is to find which perceived problems are appropriate for inter-organization problem-solving and which can be solved within individual organizations.
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- 2024
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3. The glymphatic system: implications for drugs for central nervous system diseases
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Lohela, Terhi J., Lilius, Tuomas O., and Nedergaard, Maiken
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- 2022
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4. Tie1 controls angiopoietin function in vascular remodeling and inflammation
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Korhonen, Emilia A, Lampinen, Anita, Giri, Hemant, Anisimov, Andrey, Kim, Minah, Allen, Breanna, Fang, Shentong, D’Amico, Gabriela, Sipilä, Tuomas J, Lohela, Marja, Strandin, Tomas, Vaheri, Antti, Ylä-Herttuala, Seppo, Koh, Gou Young, McDonald, Donald M, Alitalo, Kari, and Saharinen, Pipsa
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Vaccine Related ,Aetiology ,2.1 Biological and endogenous factors ,Cardiovascular ,Adult ,Aged ,Angiopoietin-1 ,Angiopoietin-2 ,Animals ,Case-Control Studies ,Cohort Studies ,Endothelial Cells ,Endothelium ,Vascular ,Endotoxemia ,Female ,Gene Deletion ,Human Umbilical Vein Endothelial Cells ,Humans ,Inflammation ,Integrin beta1 ,Lipopolysaccharides ,Male ,Mice ,Mice ,Transgenic ,Middle Aged ,Phosphorylation ,Receptor ,TIE-1 ,Receptor ,TIE-2 ,Sepsis ,Signal Transduction ,Vascular Remodeling ,Young Adult ,Medical and Health Sciences ,Immunology - Abstract
The angiopoietin/Tie (ANG/Tie) receptor system controls developmental and tumor angiogenesis, inflammatory vascular remodeling, and vessel leakage. ANG1 is a Tie2 agonist that promotes vascular stabilization in inflammation and sepsis, whereas ANG2 is a context-dependent Tie2 agonist or antagonist. A limited understanding of ANG signaling mechanisms and the orphan receptor Tie1 has hindered development of ANG/Tie-targeted therapeutics. Here, we determined that both ANG1 and ANG2 binding to Tie2 increases Tie1-Tie2 interactions in a β1 integrin-dependent manner and that Tie1 regulates ANG-induced Tie2 trafficking in endothelial cells. Endothelial Tie1 was essential for the agonist activity of ANG1 and autocrine ANG2. Deletion of endothelial Tie1 in mice reduced Tie2 phosphorylation and downstream Akt activation, increased FOXO1 nuclear localization and transcriptional activation, and prevented ANG1- and ANG2-induced capillary-to-venous remodeling. However, in acute endotoxemia, the Tie1 ectodomain that is responsible for interaction with Tie2 was rapidly cleaved, ANG1 agonist activity was decreased, and autocrine ANG2 agonist activity was lost, which led to suppression of Tie2 signaling. Tie1 cleavage also occurred in patients with hantavirus infection. These results support a model in which Tie1 directly interacts with Tie2 to promote ANG-induced vascular responses under noninflammatory conditions, whereas in inflammation, Tie1 cleavage contributes to loss of ANG2 agonist activity and vascular stability.
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- 2016
5. Resilient performance in healthcare during the COVID-19 pandemic (ResCOV): study protocol for a multilevel grounded theory study on adaptations, working conditions, ethics and patient safety
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Mirjam Ekstedt, Camilla Göras, Malin Lohela-Karlsson, Lena Nordgren, Ann-Sofie Källberg, Markus Castegren, Petronella Bjurling‐Sjöberg, Emelie Condén Mellgren, and Mats Holmberg
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Medicine - Published
- 2021
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6. Health Consequences of the COVID-19 Pandemic among Health-Care Workers: A Comparison between Groups Involved and Not Involved in COVID-19 Care
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Malin Lohela-Karlsson and Emelie Condén Mellgren
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health care ,COVID-19 ,mental health ,occupational health ,health care workers ,Medicine - Abstract
Health consequences have been reported among health-care workers (HCWs) exposed to COVID-19. Sweden chose to manage the pandemic with a lower and more equal long-lasting work strain and shorter periods of recovery than in other countries. Few studies have examined the health consequences among HCWs working in such conditions. This study compared the health consequences after the first wave of the COVID-19 pandemic between HCWs involved in the care of COVID-19 patients and other HCWs and between occupational groups working in COVID-19 care. Multinomial logistic regression and univariate general linear models were used to identify differences. The levels of depression, emotional and physical fatigue, sleep quality, and general health were measured 6 months after the onset of the pandemic in 3495 HCW employed in Sweden. HCWs directly involved in COVID-19 care reported significantly poorer sleep quality and higher scores on emotional and physical exhaustion than those not involved in such care. Health consequences did not differ significantly between different occupational groups involved in COVID-19 care except for specialist nurses/midwives. HCWs more frequently involved in COVID-19 care reported higher levels of emotional and physical fatigue and poorer sleep but less severe than those reported in more severely affected countries.
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- 2022
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7. Delineating CSF-1-dependent regulation of myeloid cell diversity in tumors
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Casbon, Amy-Jo, Lohela, Marja, and Werb, Zena
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Biomedical and Clinical Sciences ,Oncology and Carcinogenesis ,Immunology ,Cancer ,Breast Cancer ,breast cancer ,tumor microenvironment ,M-CSF ,tumor-associated macrophages ,matrix metalloproteinase ,MMP ,matrix metalloproteinase ,TAM ,tumor-associated macrophages ,Oncology and carcinogenesis - Abstract
Myeloid cells contribute to increased malignancy and poor prognosis in breast cancer. We demonstrate that anti-CSF-1R therapy depletes a cell population sharing characteristics of tumor-associated macrophages (TAMs) and dendritic cells (DCs). Intravital imaging combined with cellular characterization has refined our understanding of anti-CSF-1R therapy on the tumor microenvironment.
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- 2015
8. Intravital imaging reveals distinct responses of depleting dynamic tumor-associated macrophage and dendritic cell subpopulations
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Lohela, Marja, Casbon, Amy-Jo, Olow, Aleksandra, Bonham, Lynn, Branstetter, Daniel, Weng, Ning, Smith, Jeffrey, and Werb, Zena
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Biomedical and Clinical Sciences ,Oncology and Carcinogenesis ,Immunology ,Cancer ,Breast Cancer ,Aetiology ,2.1 Biological and endogenous factors ,Animals ,Cell Division ,Endocytosis ,Female ,Lung Neoplasms ,Macrophages ,Mammary Neoplasms ,Experimental ,Mice ,Neutrophils ,Receptor ,Macrophage Colony-Stimulating Factor ,Tumor Microenvironment ,inflammation ,myeloid cells ,matrix metalloproteinase ,CSF-1 receptor ,lung metastasis - Abstract
Tumor-infiltrating inflammatory cells comprise a major part of the stromal microenvironment and support cancer progression by multiple mechanisms. High numbers of tumor myeloid cells correlate with poor prognosis in breast cancer and are coupled with the angiogenic switch and malignant progression. However, the specific roles and regulation of heterogeneous tumor myeloid populations are incompletely understood. CSF-1 is a major myeloid cell mitogen, and signaling through its receptor CSF-1R is also linked to poor outcomes. To characterize myeloid cell function in tumors, we combined confocal intravital microscopy with depletion of CSF-1R-dependent cells using a neutralizing CSF-1R antibody in the mouse mammary tumor virus long-terminal region-driven polyoma middle T antigen breast cancer model. The depleted cells shared markers of tumor-associated macrophages and dendritic cells (M-DCs), matching the phenotype of tumor dendritic cells that take up antigens and interact with T cells. We defined functional subgroups within the M-DC population by imaging endocytic and matrix metalloproteinase activity. Anti-CSF-1R treatment altered stromal dynamics and impaired both survival of M-DCs and accumulation of new M-DCs, but did not deplete Gr-1(+) neutrophils or block doxorubicin-induced myeloid cell recruitment, and had a minimal effect on lung myeloid cells. Nevertheless, prolonged treatment led to delayed tumor growth, reduced vascularity, and decreased lung metastasis. Because the myeloid infiltrate in metastatic lungs differed significantly from that in mammary tumors, the reduction in metastasis may result from the impact on primary tumors. The combination of functional analysis by intravital imaging with cellular characterization has refined our understanding of the effects of experimental targeted therapies on the tumor microenvironment.
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- 2014
9. Real-time imaging of myeloid cells dynamics in ApcMin/+ intestinal tumors by spinning disk confocal microscopy.
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Bonnans, Caroline, Lohela, Marja, and Werb, Zena
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Biochemistry and Cell Biology ,Biological Sciences ,Cancer ,Digestive Diseases ,Biomedical Imaging ,Adenoma ,Animals ,Computer Systems ,Intestinal Neoplasms ,Mice ,Mice ,Transgenic ,Microscopy ,Confocal ,Myeloid Cells ,Cancer Biology ,Issue 92 ,intravital imaging ,spinning disk confocal ,Apc(Min/+) mice ,colorectal cancer ,tumor ,myeloid cells ,Psychology ,Cognitive Sciences ,Biochemistry and cell biology - Abstract
Myeloid cells are the most abundant immune cells within tumors and have been shown to promote tumor progression. Modern intravital imaging techniques enable the observation of live cellular behavior inside the organ but can be challenging in some types of cancer due to organ and tumor accessibility such as intestine. Direct observation of intestinal tumors has not been previously reported. A surgical procedure described here allows direct observation of myeloid cell dynamics within the intestinal tumors in live mice by using transgenic fluorescent reporter mice and injectable tracers or antibodies. For this purpose, a four-color, multi-region, micro-lensed spinning disk confocal microscope that allows long-term continuous imaging with rapid image acquisition has been used. Apc(Min/+) mice that develop multiple adenomas in the small intestine are crossed with c-fms-EGFP mice to visualize myeloid cells and with ACTB-ECFP mice to visualize intestinal epithelial cells of the crypts. Procedures for labeling different tumor components, such as blood vessels and neutrophils, and the procedure for positioning the tumor for imaging through the serosal surface are also described. Time-lapse movies compiled from several hours of imaging allow the analysis of myeloid cell behavior in situ in the intestinal microenvironment.
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- 2014
10. Impact of results-based financing on effective obstetric care coverage: evidence from a quasi-experimental study in Malawi
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Stephan Brenner, Jacob Mazalale, Danielle Wilhelm, Robin C Nesbitt, Terhi J Lohela, Jobiba Chinkhumba, Julia Lohmann, Adamson S Muula, and Manuela De Allegri
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Results-based financing ,Effective coverage ,Maternal and child health ,Quality of care ,Health care financing ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Results-based financing (RBF) describes health system approaches addressing both service quality and use. Effective coverage is a metric measuring progress towards universal health coverage (UHC). Although considered a means towards achieving UHC in settings with weak health financing modalities, the impact of RBF on effective coverage has not been explicitly studied. Methods Malawi introduced the Results-Based Financing For Maternal and Neonatal Health (RBF4MNH) Initiative in 2013 to improve quality of maternal and newborn health services at emergency obstetric care facilities. Using a quasi-experimental design, we examined the impact of the RBF4MNH on both crude and effective coverage of pregnant women across four districts during the two years following implementation. Results There was no effect on crude coverage. With a larger proportion of women in intervention areas receiving more effective care over time, the overall net increase in effective coverage was 7.1%-points (p = 0.07). The strongest impact on effective coverage (31.0%-point increase, p = 0.02) occurred only at lower cut-off level (60% of maximum score) of obstetric care effectiveness. Design-specific and wider health system factors likely limited the program’s potential to produce stronger effects. Conclusion The RBF4MNH improved effective coverage of pregnant women and seems to be a promising reform approach towards reaching UHC. Given the short study period, the full potential of the current RBF scheme has likely not yet been reached.
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- 2018
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11. Perceived health and work-environment related problems and associated subjective production loss in an academic population
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Malin Lohela-Karlsson, Lotta Nybergh, and Irene Jensen
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Health problems ,Work environment ,Production loss ,Academic employees ,Gender ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background The aim was to investigate the prevalence of health problems and work environment problems and how these are associated with subjective production loss among women and men at an academic workplace. An additional aim was to investigate whether there were differences between women and men according to age group, years at current workplace, academic rank or managerial position. Methods A questionnaire was sent in 2011 to all employees at a Swedish university (n = 5144). Only researchers and teachers were included in the study (n = 3207). Spearman correlations were performed to investigate differences in health and work environment problems. Employees who reported having experienced work environment or health problems in the previous seven days (n = 1475) were included in the analyses in order to investigate differences in subjective production loss. This was done using Student’s t-test, One-way Anova and generalized linear models. Results The response rate was 63% (n = 2022). A total of 819 academic staff (40% of the population) reported experiencing either health problems, work environment problems or both during the previous seven days. The prevalence of health problems only or a combination of work environment and health problems was higher among women than men (p-value ˂0.05). This was especially the case for younger women, those in lower academic positions and those who had worked for fewer years at their current workplace. No difference was found for work environment problems. The majority of the employees who reported problems said that these problems affected their ability to perform at work (84–99%). The average production loss varied between 31 and 42% depending on the type of problem. Production loss due to health-related and work-environment related problems was highest among junior researchers and managers. No significant difference between men and women was found in the level of production loss. Conclusion Subjective production loss in academia can be associated with health and work- environment problems. These losses appear similar for women and men even though younger female academics, women in lower academic ranks and those with fewer years of employment in their current workplace report a higher prevalence of health problems and combined work-environment and health problems than men.
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- 2018
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12. ECU convention 2017 research presentations
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Alice Kongsted, Lise Hestbaek, Carlo Ammendolia, Pierre Côté, Danielle Southerst, Michael Schneider, Brian Budgell, Claire Bombardier, Gillian Hawker, Y. Raja Rampersaud, Corinne Minder, Cynthia Peterson, B. Kim Humphreys, Halldór Fannar Gíslason, Jari Kullervo Salminen, Linn Sandhaugen, Andreas Stenseth Storbråten, Renske Versloot, Inger Rouge, Dave Newell, Ellen Aartun, Hainan Yu, Erik Poulsen, Glaucia H. Goncalves, Ewa M. Roos, Jonas B. Thorlund, Carsten Juhl, Andreas Eklund, Irene Jensen, Malin Lohela-Karlsson, Jan Hagberg, Lennart Bodin, Charlotte Lebouf-Yde, Iben Axén, Kristina Boe Dissing, Jan Hartvigsen, Christopher Williams, Steven Kamper, Eleanor Boyle, Niels Wedderkopp, Lise Hestbæk, Michael L. Meier, Petra Schweinhardt, Kim Humphreys, Amy Miller, Joyce Miller, Alison Taylor, Sue Way, Brigitte Wirth, Bruno A. P. Alvarenga, Marcelo B. Botelho, Jerusa P. R. Lara, António P. Veloso, Cecilia Bergström, Margareta Persson, Ingrid Mogren, B. Janine Thöni, David Guillén, Daniel Heritage, David Byfield, Annie Newsam, Mehmet Toprak, Hasan Kerem Alptekim, Doruk Turhan, Hazel Mellars, Jacqueline Rix, Philip Dewhurst, Caroline Cooke, David Newell, Joel Alcantara, Jeanne Ohm, Junjoe Alcantara, Jonathan Field, Heather Hanson, Hiew Mandy, Lo Derek, Mok Zicheng, Tee Yun Han, Miller Joyce, Signe Fuglkjær, P. Schweinhardt, B. Wirth, G. Peterson, B. K. Humphreys, Tim L. Raven, Lise R. Lothe, Torsten Eken, and Rick Serola
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Chiropractic ,RZ201-275 ,Diseases of the musculoskeletal system ,RC925-935 - Published
- 2017
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13. Influence of Intravenous S-Ketamine on the Pharmacokinetics of Oral Morphine in Healthy Volunteers
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Lohela, Terhi J., Poikola, Satu, Backmansson, Daniel, Lapatto-Reiniluoto, Outi, Backman, Janne T., Olkkola, Klaus T., and Lilius, Tuomas O.
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- 2024
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14. Preventing sickness absenteeism among employees with common mental disorders or stress-related symptoms at work: Design of a cluster randomized controlled trial of a problem-solving based intervention versus care-as-usual conducted at the Occupational Health Services
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G. Bergström, M. Lohela-Karlsson, L. Kwak, L. Bodin, I. Jensen, M. Torgén, and L. Nybergh
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Common mental disorders ,Cluster randomized study ,Stress-related disorders ,Adjustment disorders ,Depression ,Exhaustion ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Common mental disorders (CMDs) are among the leading causes of sick leave in Sweden and other OECD countries. They result in suffering for the individual and considerable financial costs for the employer and for society at large. The occupational health service (OHS) can offer interventions in which both the individual and the work situation are taken into account. The aim of this paper is to describe the design of a study evaluating the effectiveness of an intervention given at the OHS to employees with CMDs or stress-related symptoms at work. In addition, intervention fidelity and its relation to the outcome will be assessed in a process analysis. Methods The study is designed as a cluster randomized trial in which the participating OHS consultants are randomized into either delivering the intervention or performing care as usual. Employees with CMDs or stress-related symptoms at work are recruited consecutively by the OHS consultants. The intervention aims to improve the match between the employee and the job situation. Interviews are held individually with the employee and the nearest supervisor, after which a joint meeting with both the employee and the supervisor takes place. A participatory approach is applied by which the supervisor and the employee are guided by the OHS consultant and encouraged to actively take part in problem solving concerning the work situation. Outcomes will be assessed at baseline and at six and 12 months. A long-term follow-up at 3 years will also be performed. The primary outcome is registered sickness absence during a 1-year period after study inclusion. Secondary outcomes are mental health and work ability. The intervention’s cost effectiveness, compared to treatment as usual, both for society and for the employer will be evaluated. A process evaluation by both the OHS consultants and the employee will be carried out. Discussion The study includes analyses of the effectiveness of the intervention (clinical and economic) as well as an analysis of its implementation at the participating OHSs. Possible methodological challenges such as selection bias and risk of contamination between OHS consultants delivering the experimental condition and consultants giving usual care are discussed. Trial registration ClinicalTrials NCT02563743 Sep 28 2015.
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- 2017
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15. Does facility birth reduce maternal and perinatal mortality in Brong Ahafo, Ghana? A secondary analysis using data on 119 244 pregnancies from two cluster-randomised controlled trials
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Sabine Gabrysch, ProfPhD, Robin C Nesbitt, Dr. sc. hum., Anja Schoeps, Dr. sc. hum., Lisa Hurt, PhD, Seyi Soremekun, PhD, Karen Edmond, ProfPhD, Alexander Manu, PhD, Terhi J Lohela, PhD, Samuel Danso, PhD, Keith Tomlin, MSc, Betty Kirkwood, ProfFMedSci, and Oona M R Campbell, ProfPhD
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Public aspects of medicine ,RA1-1270 - Abstract
Summary: Background: Maternal and perinatal mortality are still unacceptably high in many countries despite steep increases in facility birth. The evidence that childbirth in facilities reduces mortality is weak, mainly because of the scarcity of robust study designs and data. We aimed to assess this link by quantifying the influence of major determinants of facility birth (cluster-level facility birth, wealth, education, and distance to childbirth care) on several mortality outcomes, while also considering quality of care. Methods: Our study is a secondary analysis of surveillance data on 119 244 pregnancies from two large population-based cluster-randomised controlled trials in Brong Ahafo, Ghana. In addition, we specifically collected data to assess quality of care at all 64 childbirth facilities in the study area. Outcomes were direct maternal mortality, perinatal mortality, first-day and early neonatal mortality, and antepartum and intrapartum stillbirth. We calculated cluster-level facility birth as the percentage of facility births in a woman's village over the preceding 2 years, and we computed distances from women's regular residence to health facilities in a geospatial database. Associations between determinants of facility birth and mortality outcomes were assessed in crude and multivariable multilevel logistic regression models. We stratified perinatal mortality effects by three policy periods, using April 1, 2005, and July 1, 2008, as cutoff points, when delivery-fee exemption and free health insurance were introduced in Ghana. These policies increased facility birth and potentially reduced quality of care. Findings: Higher proportions of facility births in a cluster were not linked to reductions in any of the mortality outcomes. In women who were wealthier, facility births were much more common than in those who were poorer, but mortality was not lower among them or their babies. Women with higher education had lower mortality risks than less-educated women, except first-day and early neonatal mortality. A substantially higher proportion of women living in areas closer to childbirth facilities had facility births and caesarean sections than women living further from childbirth facilities, but mortality risks were not lower despite this increased service use. Among women who lived in areas closer to facilities offering comprehensive emergency obstetric care (CEmOC), emergency newborn care, or high-quality routine care, or to facilities that had providers with satisfactory competence, we found a lower risk of intrapartum stillbirth (14·2 per 1000 deliveries at >20 km from a CEmOC facility vs 10·4 per 1000 deliveries at ≤1 km; odds ratio [OR] 1·13, 95% CI 1·06–1·21) and of composite mortality outcomes than among women living in areas where these services were further away. Protective effects of facility birth were restricted to the two earlier policy periods (from June 1, 2003, to June 30, 2008), whereas there was evidence for higher perinatal mortality with increasing wealth (OR 1·09, 1·03–1·14) and lower perinatal mortality with increasing distance from childbirth facilities (OR 0·93, 0·89–0·98) after free health insurance was introduced in July 1, 2008. Interpretation: Facility birth does not necessarily convey a survival benefit for women or babies and should only be recommended in facilities capable of providing emergency obstetric and newborn care and capable of safe-guarding uncomplicated births. Funding: The Baden-Württemberg Foundation, the Daimler and Benz Foundation, the European Social Fund and Ministry of Science, Research, and the Arts Baden-Württemberg, WHO, US Agency for International Development, Save the Children, the Bill & Melinda Gates Foundation, and the UK Department for International Development.
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- 2019
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16. Comparing socioeconomic inequalities between early neonatal mortality and facility delivery: Cross-sectional data from 72 low- and middle-income countries
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Lohela, Terhi J., Nesbitt, Robin C., Pekkanen, Juha, and Gabrysch, Sabine
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- 2019
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17. What incentives influence employers to engage in workplace health interventions?
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Camilla Martinsson, Malin Lohela-Karlsson, Lydia Kwak, Gunnar Bergström, and Therese Hellman
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Employers ,Workplace ,Incentives ,Factors ,Motivation ,Occupational health and safety ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background To achieve a sustainable working life it is important to know more about what could encourage employers to increase the use of preventive and health promotive interventions. The objective of the study is to explore and describe the employer perspective regarding what incentives influence their use of preventive and health promotive workplace interventions. Method Semi-structured focus group interviews were carried out with 20 representatives from 19 employers across Sweden. The economic sectors represented were municipalities, government agencies, defence, educational, research, and development institutions, health care, manufacturing, agriculture and commercial services. The interviews were transcribed verbatim and the data were analysed using latent content analysis. Results Various incentives were identified in the analysis, namely: “law and provisions”, “consequences for the workplace”, “knowledge of worker health and workplace health interventions”, “characteristics of the intervention”, “communication and collaboration with the provider”. The incentives seemed to influence the decision-making in parallel with each other and were not only related to positive incentives for engaging in workplace health interventions, but also to disincentives. Conclusions This study suggests that the decision to engage in workplace health interventions was influenced by several incentives. There are those incentives that lead to a desire to engage in a workplace health intervention, others pertain to aspects more related to the intervention use, such as the characteristics of the employer, the provider and the intervention. It is important to take all incentives into consideration when trying to understand the decision-making process for workplace health interventions and to bridge the gap between what is produced through research and what is used in practice.
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- 2016
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18. Fighting vessel dysmorphia to improve glioma chemotherapy
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Marja Lohela and Kari Alitalo
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Medicine (General) ,R5-920 ,Genetics ,QH426-470 - Abstract
Abstract High‐grade gliomas are aggressive and abundantly vascular tumors, and as in most cancer types, blood vessels in advanced lesions are highly abnormal. Poor perfusion and vascular leakage in tumor tissue resulting in hypoxia, necrosis, and high interstitial fluid pressure can hamper the efficient delivery of chemotherapy. Tumor angiogenesis is known to be supported by host leukocytes recruited to the tumor microenvironment, but the mechanisms leading to dysfunctional vascular network formation are incompletely understood. In this issue of EMBO Molecular Medicine, Mathivet et al (2017) present an elegant study, where longitudinal intravital imaging gives new insight on how recruitment and polarization of tumor‐associated macrophages regulate aberrant angiogenesis in experimental gliomas. They show that macrophage targeting results in vessel normalization and improved chemotherapy response, suggesting that the combination of these therapeutic modalities could improve the outcome of glioma treatment in the clinic.
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- 2017
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19. Fighting vessel dysmorphia to improve glioma chemotherapy
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Lohela, Marja and Alitalo, Kari
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- 2017
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20. The Nordic Maintenance Care program: Effectiveness of chiropractic maintenance care versus symptom-guided treatment for recurrent and persistent low back pain-A pragmatic randomized controlled trial.
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Andreas Eklund, Irene Jensen, Malin Lohela-Karlsson, Jan Hagberg, Charlotte Leboeuf-Yde, Alice Kongsted, Lennart Bodin, and Iben Axén
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Medicine ,Science - Abstract
BACKGROUND:For individuals with recurrent or persistent non-specific low back pain (LBP), exercise and exercise combined with education have been shown to be effective in preventing new episodes or in reducing the impact of the condition. Chiropractors have traditionally used Maintenance Care (MC), as secondary and tertiary prevention strategies. The aim of this trial was to investigate the effectiveness of MC on pain trajectories for patients with recurrent or persistent LBP. METHOD:This pragmatic, investigator-blinded, two arm randomized controlled trial included consecutive patients (18-65 years old) with non-specific LBP, who had an early favorable response to chiropractic care. After an initial course of treatment, eligible subjects were randomized to either MC or control (symptom-guided treatment). The primary outcome was total number of days with bothersome LBP during 52 weeks collected weekly with text-messages (SMS) and estimated by a GEE model. RESULTS:Three hundred and twenty-eight subjects were randomly allocated to one of the two treatment groups. MC resulted in a reduction in the total number of days per week with bothersome LBP compared with symptom-guided treatment. During the 12 month study period, the MC group (n = 163, 3 dropouts) reported 12.8 (95% CI = 10.1, 15.5; p =
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- 2018
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21. Perceived health and work-environment related problems and associated subjective production loss in an academic population
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Lohela-Karlsson, Malin, Nybergh, Lotta, and Jensen, Irene
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- 2018
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22. Individual preferences for physical exercise as secondary prevention for non-specific low back pain: A discrete choice experiment.
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Emmanuel Aboagye, Jan Hagberg, Iben Axén, Lydia Kwak, Malin Lohela-Karlsson, Eva Skillgate, Gunilla Dahlgren, and Irene Jensen
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Medicine ,Science - Abstract
Exercise is effective in improving non-specific low back pain (LBP). Certain components of physical exercise, such as the type, intensity and frequency of exercise, are likely to influence participation among working adults with non-specific LBP, but the value and relative importance of these components remain unknown. The study's aim was to examine such specific components and their influence on individual preferences for exercise for secondary prevention of non-specific LBP among working adults.In a discrete choice experiment, working individuals with non-specific LBP answered a web-based questionnaire. Each respondent was given ten pairs of hypothetical exercise programs and asked to choose one option from each pair. The choices comprised six attributes of exercise (i.e., type of training, design, intensity, frequency, proximity and incentives), each with either three or four levels. A conditional logit regression that reflected the random utility model was used to analyze the responses.The final study population consisted of 112 participants. The participants' preferred exercise option was aerobic (i.e., cardiovascular) rather than strength training, group exercise with trainer supervision, rather than individual or unsupervised exercise. They also preferred high intensity exercise performed at least once or twice per week. The most popular types of incentive were exercise during working hours and a wellness allowance rather than coupons for sports goods. The results show that the relative value of some attribute levels differed between young adults (age ≤ 44 years) and older adults (age ≥ 45 years) in terms of the level of trainer supervision required, exercise intensity, travel time to exercise location and financial incentives. For active study participants, exercise frequency (i.e., twice per week, 1.15; CI: 0.25; 2.06) influenced choice of exercise. For individuals with more than one child, travel time (i.e., 20 minutes, -0.55; CI: 0.65; 3.26) was also an influential attribute for choice of exercise, showing that people with children at home preferred to exercise close to home.This study adds to our knowledge about what types of exercise working adults with back pain are most likely to participate in. The exercise should be a cardiovascular type of training carried out in a group with trainer supervision. It should also be of high intensity and preferably performed twice per week during working hours. Coupons for sports goods do not appear to motivate physical activity among workers with LBP. The findings of the study could have a substantial impact on the planning and development of exercise provision and promotion strategies to improve non-specific LBP. Providers and employers may be able to improve participation in exercise programs for adults with non-specific LBP by focusing on the exercise components which are the most attractive. This in turn would improve satisfaction and adherence to exercise interventions aimed at preventing recurrent non-specific LBP.
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- 2017
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23. Production loss among employees perceiving work environment problems
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Lohela-Karlsson, Malin, Hagberg, Jan, and Bergström, Gunnar
- Published
- 2015
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- View/download PDF
24. Correction: Quality along the Continuum: A Health Facility Assessment of Intrapartum and Postnatal Care in Ghana.
- Author
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Robin C Nesbitt, Terhi J Lohela, Alexander Manu, Linda Vesel, Eunice Okyere, Karen Edmond, Seth Owusu-Agyei, Betty R Kirkwood, and Sabine Gabrysch
- Subjects
Medicine ,Science - Published
- 2015
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- View/download PDF
25. Correction: Quality along the Continuum: A Health Facility Assessment of Intrapartum and Postnatal Care in Ghana.
- Author
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Robin C. Nesbitt, Terhi J. Lohela, Alexander Manu, Linda Vesel, Eunice Okyere, Karen Edmond, Seth Owusu-Agyei, Betty R. Kirkwood, and Sabine Gabrysch
- Subjects
Medicine ,Science - Published
- 2014
- Full Text
- View/download PDF
26. Quality along the continuum: a health facility assessment of intrapartum and postnatal care in Ghana.
- Author
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Robin C Nesbitt, Terhi J Lohela, Alexander Manu, Linda Vesel, Eunice Okyere, Karen Edmond, Seth Owusu-Agyei, Betty R Kirkwood, and Sabine Gabrysch
- Subjects
Medicine ,Science - Abstract
To evaluate quality of routine and emergency intrapartum and postnatal care using a health facility assessment, and to estimate "effective coverage" of skilled attendance in Brong Ahafo, Ghana.We conducted an assessment of all 86 health facilities in seven districts in Brong Ahafo. Using performance of key signal functions and the availability of relevant drugs, equipment and trained health professionals, we created composite quality categories in four dimensions: routine delivery care, emergency obstetric care (EmOC), emergency newborn care (EmNC) and non-medical quality. Linking the health facility assessment to surveillance data we estimated "effective coverage" of skilled attendance as the proportion of births in facilities of high quality.Delivery care was offered in 64/86 facilities; only 3-13% fulfilled our requirements for the highest quality category in any dimension. Quality was lowest in the emergency care dimensions, with 63% and 58% of facilities categorized as "low" or "substandard" for EmOC and EmNC, respectively. This implies performing less than four EmOC or three EmNC signal functions, and/or employing less than two skilled health professionals, and/or that no health professionals were present during our visit. Routine delivery care was "low" or "substandard" in 39% of facilities, meaning 25/64 facilities performed less than six routine signal functions and/or had less than two skilled health professionals and/or less than one midwife. While 68% of births were in health facilities, only 18% were in facilities with "high" or "highest" quality in all dimensions.Our comprehensive facility assessment showed that quality of routine and emergency intrapartum and postnatal care was generally low in the study region. While coverage with facility delivery was 68%, we estimated "effective coverage" of skilled attendance at 18%, thus revealing a large "quality gap." Effective coverage could be a meaningful indicator of progress towards reducing maternal and newborn mortality.
- Published
- 2013
- Full Text
- View/download PDF
27. Distance to care, facility delivery and early neonatal mortality in Malawi and Zambia.
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Terhi J Lohela, Oona M R Campbell, and Sabine Gabrysch
- Subjects
Medicine ,Science - Abstract
BACKGROUND: Globally, approximately 3 million babies die annually within their first month. Access to adequate care at birth is needed to reduce newborn as well as maternal deaths. We explore the influence of distance to delivery care and of level of care on early neonatal mortality in rural Zambia and Malawi, the influence of distance (and level of care) on facility delivery, and the influence of facility delivery on early neonatal mortality. METHODS AND FINDINGS: National Health Facility Censuses were used to classify the level of obstetric care for 1131 Zambian and 446 Malawian delivery facilities. Straight-line distances to facilities were calculated for 3771 newborns in the 2007 Zambia DHS and 8842 newborns in the 2004 Malawi DHS. There was no association between distance to care and early neonatal mortality in Malawi (OR 0.97, 95%CI 0.58-1.60), while in Zambia, further distance (per 10 km) was associated with lower mortality (OR 0.55, 95%CI 0.35-0.87). The level of care provided in the closest facility showed no association with early neonatal mortality in either Malawi (OR 1.02, 95%CI 0.90-1.16) or Zambia (OR 1.02, 95%CI 0.82-1.26). In both countries, distance to care was strongly associated with facility use for delivery (Malawi: OR 0.35 per 10km, 95%CI 0.26-0.46). All results are adjusted for available confounders. Early neonatal mortality did not differ by frequency of facility delivery in the community. CONCLUSIONS: While better geographic access and higher level of care were associated with more frequent facility delivery, there was no association with lower early neonatal mortality. This could be due to low quality of care for newborns at health facilities, but differential underreporting of early neonatal deaths in the DHS is an alternative explanation. Improved data sources are needed to monitor progress in the provision of obstetric and newborn care and its impact on mortality.
- Published
- 2012
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- View/download PDF
28. Ultrasound-guided drainages and sclerotherapy
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Lohela, P.
- Published
- 2002
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- View/download PDF
29. NIR spectroscopic immediate effects of irradiation on skin tissue: a comparison study of in vivo and ex vivo
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Genina, Elina A., Tuchin, Valery V., Karthikeyan, Priya, Honka, Ulriika, Ferdinando, Hany, Lohela, Jesse, Inget, Kalle, Korhonen, Vesa, Karhula, Sakari, Nikkinen, Juha, and Myllylä, Teemu
- Published
- 2022
- Full Text
- View/download PDF
30. Nasopharyngeal Symptoms in Patients with Obstructive Sleep Apnea Syndrome: Effect of Nasal CPAP Treatment
- Author
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Brander, P. E., Soirinsuo, M., and Lohela, P.
- Published
- 1999
- Full Text
- View/download PDF
31. Bilateral diaphragmatic weakness: a late complication of radiotherapy
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Brander, P E, Jarvinen, V, Lohela, P, and Salmi, T
- Published
- 1997
32. ULTRASOUND-GUIDED FINE-NEEDLE ASPIRATION CYTOLOGY OF NON-PALPABLE SUPRACLAVICULAR LYMPH NODES IN SARCOIDOSIS
- Author
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Lohela, P., Tikkakoski, T., Strengell, L., Mikkola, S., Koskinen, S., and Suramo, I.
- Published
- 1996
33. Rifampin Reduces the Plasma Concentrations of Oral and Intravenous Hydromorphone in Healthy Volunteers
- Author
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Lohela, Terhi J., Poikola, Satu, Neuvonen, Mikko, Niemi, Mikko, Backman, Janne T., Olkkola, Klaus T., and Lilius, Tuomas O.
- Published
- 2021
- Full Text
- View/download PDF
34. Preventing sickness absence among employees with common mental disorders or stress-related symptoms at work: a cluster randomised controlled trial of a problem-solving-based intervention conducted by the Occupational Health Services
- Author
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Keus van de Poll, Marijke, Nybergh, Lotta, Lornudd, Caroline, Hagberg, Jan, Bodin, Lennart, Kwak, Lydia, Jensen, Irene, Lohela-Karlsson, Malin, Torgén, Margareta, and Bergstrom, Gunnar
- Abstract
ObjectivesCommon mental disorders (CMDs) are among the main causes of sickness absence and can lead to suffering and high costs for individuals, employers and the society. The occupational health service (OHS) can offer work-directed interventions to support employers and employees. The aim of this study was to evaluate the effect on sickness absence and health of a work-directed intervention given by the OHS to employees with CMDs or stress-related symptoms.MethodsRandomisation was conducted at the OHS consultant level and each consultant was allocated into either giving a brief problem-solving intervention (PSI) or care as usual (CAU). The study group consisted of 100 employees with stress symptoms or CMDs. PSI was highly structured and used a participatory approach, involving both the employee and the employee’s manager. CAU was also work-directed but not based on the same theoretical concepts as PSI. Outcomes were assessed at baseline, at 6 and at 12 months. Primary outcome was registered sickness absence during the 1-year follow-up period. Among the secondary outcomes were self-registered sickness absence, return to work (RTW) and mental health.ResultsA statistical interaction for group × time was found on the primary outcome (p=0.033) and PSI had almost 15 days less sickness absence during follow-up compared with CAU. Concerning the secondary outcomes, PSI showed an earlier partial RTW and the mental health improved in both groups without significant group differences.ConclusionPSI was effective in reducing sickness absence which was the primary outcome in this study.
- Published
- 2020
- Full Text
- View/download PDF
35. Tissue optical clearing for fNIRS studies in radiotherapy
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Luo, Qingming, Li, Xingde, Gu, Ying, Zhu, Dan, Lazareva, Ekaterina N., Karthikeyan, Priya, Lohela, Jesse, Inget, Kalle, Korhonen, Vesa, Karhula, Sakari, Nikkinen, Juha, Tuchin, Valery, and Myllyla, Teemu
- Published
- 2023
- Full Text
- View/download PDF
36. Bilateral diaphragmatic weakness: a late complication of radiotherapy
- Author
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Lohela P, P E Brander, V Järvinen, and Salmi T
- Subjects
Pulmonary and Respiratory Medicine ,medicine.medical_specialty ,Weakness ,Time Factors ,Neuromuscular disease ,medicine.medical_treatment ,Diaphragm ,medicine ,Humans ,Brachial Plexus ,Diaphragmatic weakness ,Radiation Injuries ,Brachial Plexus Neuropathy ,Aged ,Phrenic nerve ,Radiotherapy ,business.industry ,Late complication ,medicine.disease ,Hodgkin Disease ,Respiratory Paralysis ,Surgery ,Phrenic Nerve ,Radiation therapy ,Papers ,Female ,medicine.symptom ,business ,Complication - Abstract
Brachial plexus neuropathy is an unfortunate complication that sometimes follows radiotherapy to the axillary and supraclavicular regions. A patient is described who, 30 years after radiotherapy for Hodgkin's disease and more than 10 years after the development of radiation-induced bilateral brachial plexus neuropathy, presented with bilateral diaphragmatic weakness secondary to bilateral phrenic nerve weakness. Previous radiotherapy was the most probable cause of the condition.
- Published
- 1997
37. Molecular Players in Lymphangiogenesis.
- Author
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Marmé, Dieter, Fusenig, Norbert, Lohela, Marja, and Alitalo, Kari
- Abstract
Lymph vessels are essential for the maintenance of tissue fluid homeostasis and immune surveillance and are involved in the pathogenesis of several human diseases, such as lymphoedema, inflammation and tumour metastasis. The identification of lymphangiogenic growth factors and their receptor, and of transcription factors that control lymphangiogenesis, have provided significant insight into the biology of lymphatic vasculature. Another important advance has been the recent development of mouse, frog and fish models that allow the study of lymphangiogenesis and diseases affecting lymph vessels. In this review we discuss some of the major molecular players involved in regulation of lymphangiogenesis and lymph vessel remodelling, and the role of lymph vessels and their regulators in human disease. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
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38. Ultrasound-guided drainages and sclerotherapy
- Author
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Lohela, P., primary
- Published
- 2001
- Full Text
- View/download PDF
39. Is a change in work motivation related to a change in mental well-being?
- Author
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Björklund, Christina, Jensen, Irene, and Lohela-Karlsson, Malin
- Subjects
EMPLOYEE motivation ,MENTAL health ,WELL-being ,FOLLOW-up studies (Medicine) ,JOB stress ,VOCATIONAL guidance - Abstract
Abstract: The purpose of the study was to investigate the effect of changes on work motivation and the effect of the changes on future mental well-being. This prospective study comprised 577 employees who were followed up 18months after a comprehensive baseline measurement. The response rate was 81% for the baseline and 72% for the follow-up. The results show that both negative and positive changes in work motivation over time (18months) were related to exhaustion. A similar correlation was found between negative changes in work motivation and depression. The results show that employees with a decreased level of work motivation had a higher risk of experiencing more exhaustion and depression in the future. Thus, investing in activities to promote work motivation may be an effective means of preventing long-term sick leave for stress-related mental illness and of providing energy for successful career advancement. [Copyright &y& Elsevier]
- Published
- 2013
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- View/download PDF
40. Pleuro-Pulmonary Aspergillosis
- Author
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Tikkakoski, T., primary, Lohela, P., additional, Päivänsalo, M., additional, and Kerola, T., additional
- Published
- 1995
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41. Nonparasitic Splenic Cysts
- Author
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Siniluoto, T. M. J., primary, Päivänsalo, M. J., additional, Lähde, S. T., additional, Alavaikko, M. J., additional, Lohela, P. K., additional, Typpö, A. B. T., additional, and Suramo, I. J. I., additional
- Published
- 1994
- Full Text
- View/download PDF
42. Diagnosis of diffuse lung disease by cutting needle biopsy
- Author
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Lohela, P., primary, Tikkakoski, Tapani, additional, Ammala, K., additional, Strengell, L., additional, Suramo, I., additional, and Repo, U. K., additional
- Published
- 1994
- Full Text
- View/download PDF
43. Thoracic lesions: Diagnosis by ultrasound-guided biopsy
- Author
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Tikkakoski, T., primary, Lohela, P., additional, Taavitsainen, M., additional, Hiltunen, S., additional, Ihalainen, J., additional, Päivänsalo, M., additional, Siniluoto, T., additional, Strengel, L., additional, and Apaja-Sarkkinen, M., additional
- Published
- 1993
- Full Text
- View/download PDF
44. Gallbladder Necrosis following Hepatic Artery Embolization
- Author
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Tikkakoski, T., primary, Myllymäki, T., additional, Turunen, J., additional, Typpö, T., additional, Lohela, P., additional, Hulkko, A., additional, and Suramo, I., additional
- Published
- 1993
- Full Text
- View/download PDF
45. Ultrasound-Guided Aspiration Cytology of Enlarged Lymph Nodes
- Author
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Tikkakoski, T., primary, Siniluoto, T., additional, Ollikainen, A., additional, Päivänsalo, M., additional, Lohela, P., additional, and Apaja-Sarkkinen, M., additional
- Published
- 1991
- Full Text
- View/download PDF
46. Accuracy of postmortem radiography of excised air-inflated human lungs in assessment of pulmonary emphysema.
- Author
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Sutinen, S, Lohela, P, Pääkkö, P, and Lahti, R
- Abstract
The accuracy of radiography of excised air-inflated lungs in assessing pulmonary emphysema at necropsy was evaluated in a series of 107 adults who had died in hospital by reading the radiographs and examining the pathological specimens independently. The radiographic and pathological assessments of the severity of emphysema correlated significantly (r = 0.87, p less than 0.0001). Mild emphysema was recognised radiographically in 88.7% and moderate in 94.9% of the lungs. One of 16 normal lungs (6.3%) was radiographically diagnosed as showing mild emphysema. Six out of 53 lungs (11.3%) with mild emphysema were radiographically assessed as normal. The correct radiographic recognition of the type of emphysema was possible in 86% of lungs with mild and 97.4% with moderate centrilobular emphysema and in 81.8% and 87.5% respectively of the lungs with mild and moderate paracicatricial emphysema, but in only 25.0% and 28.6% of the lungs with mild and moderate panlobular emphysema. Radiographical diagnosis of centrilobular and paracicatricial emphysema was verified pathologically in all lungs showing mild emphysema, but that of panlobular emphysema in only 66.7%. Radiography of excised air-inflated lungs is a rapid, convenient, and reliable method of recognising and assessing the severity of appreciable degrees of centrilobular and paracicatricial emphysema, but less reliable in recognising panlobular emphysema. After the procedure the specimen remains available for almost any other technique. [ABSTRACT FROM AUTHOR]
- Published
- 1982
47. Ultrasound-guided aspiration biopsy of anterior mediastinal masses.
- Author
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Tikkakoski, Tapani, Lohela, Pentti, Leppänen, Martti, Apaja-Sarkkinen, Meeri, Typpö, Tapani, Mäkäräinen, Hanna, Tikkakoski, T, Lohela, P, Leppänen, M, Apaja-Sarkkinen, M, Typpäo, T, and Mäkäräinen, H
- Published
- 1991
- Full Text
- View/download PDF
48. Transgenic Induction of Vascular Endothelial Growth Factor-C Is Strongly Angiogenic in Mouse Embryos but Leads to Persistent Lymphatic Hyperplasia in Adult Tissues
- Author
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Lohela, Marja, Heloterä, Hanna, Haiko, Paula, Dumont, Daniel J., and Alitalo, Kari
- Abstract
Vascular endothelial growth factor-C (VEGF-C) is the quintessential lymphangiogenic growth factor that is required for the development of the lymphatic system and is capable of stimulating lymphangiogenesis in adults by activating its receptor, VEGFR-3. Although VEGF-C is a major candidate molecule for the development of prolymphangiogenic therapy for defective lymphatic vessels in lymphedema, the stability of lymph vessels generated by exogenous VEGF-C administration is not currently known. We studied VEGF-C-stimulated lymphangiogenesis in inducible transgenic mouse models in which growth factor expression can be spatially and temporally controlled without side effects, such as inflammation. VEGF-C induction in adult mouse skin for 1 to 2 weeks caused robust lymphatic hyperplasia that persisted for at least 6 months. VEGF-C induced lymphangiogenesis in numerous tissues and organs when expressed in the vascular endothelium in either neonates or adult mice. Very few or no effects were observed in either blood vessels or collecting lymph vessels. Additionally, VEGF-C stimulated lymphangiogenesis in embryos after the onset of lymphatic vessel development. Strikingly, a strong angiogenic effect was observed after VEGF-C induction in vascular endothelium at any point before embryonic day 16.5. Our results indicate that blood vessels can undergo VEGF-C-induced angiogenesis even after down-regulation of VEGFR-3 in embryos; however, transient VEGF-C expression in adults can induce long-lasting lymphatic hyperplasia with no obvious side effects on the blood vasculature.
- Published
- 2008
- Full Text
- View/download PDF
49. Angiopoietin-1 promotes lymphatic sprouting and hyperplasia
- Author
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Tammela, Tuomas, Saaristo, Anne, Lohela, Marja, Morisada, Tohru, Tornberg, Jenny, Norrmén, Camilla, Oike, Yuichi, Pajusola, Katri, Thurston, Gavin, Suda, Toshio, Yla-Herttuala, Seppo, and Alitalo, Kari
- Abstract
Angiopoietin 1 (Ang1), a ligand for the receptor tyrosine kinase Tie2, regulates the formation and stabilization of the blood vessel network during embryogenesis. In adults, Ang1 is associated with blood vessel stabilization and recruitment of perivascular cells, whereas Ang2 acts to counter these actions. Recent results from gene-targeted mice have shown that Ang2 is also essential for the proper patterning of lymphatic vessels and that Ang1 can be substituted for this function. In order to characterize the effects of the angiopoietins on lymphatic vessels, we employed viral vectors for overexpression of Ang1 in adult mouse tissues. We found that Ang1 activated lymphatic vessel endothelial proliferation, vessel enlargement, and generation of long endothelial cell filopodia that eventually fused, leading to new sprouts and vessel development. Cutaneous lymphatic hyperplasia was also detected in transgenic mice expressing Ang1 in the basal epidermal cells. Tie2 was expressed in the lymphatic endothelial cells and Ang1 stimulation of these cells resulted in up-regulation of vascular endothelial growth factor receptor 3 (VEGFR-3). Furthermore, a soluble form of VEGFR-3 inhibited the observed lymphatic sprouting. Our results reinforce the concept that Ang1 therapy may be useful in settings of tissue edema. (Blood. 2005;105:4642-4648)
- Published
- 2005
- Full Text
- View/download PDF
50. PDGF-D induces macrophage recruitment, increased interstitial pressure, and blood vessel maturation during angiogenesis
- Author
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Uutela, Marko, Wirzenius, Maria, Paavonen, Karri, Rajantie, Iiro, He, Yulong, Karpanen, Terhi, Lohela, Marja, Wiig, Helge, Salven, Petri, Pajusola, Katri, Eriksson, Ulf, and Alitalo, Kari
- Abstract
Platelet-derived growth factor-D (PDGF-D) is a recently characterized member of the PDGF family with unknown in vivo functions. We investigated the effects of PDGF-D in transgenic mice by expressing it in basal epidermal cells and then analyzed skin histology, interstitial fluid pressure, and wound healing. When compared with control mice, PDGF-D transgenic mice displayed increased numbers of macrophages and elevated interstitial fluid pressure in the dermis. Wound healing in the transgenic mice was characterized by increased cell density and enhanced recruitment of macrophages. Macrophage recruitment was also the characteristic response when PDGF-D was expressed in skeletal muscle or ear by an adeno-associated virus vector. Combined expression of PDGF-D with vascular endothelial growth factor-E (VEGF-E) led to increased pericyte/smooth muscle cell coating of the VEGF-E–induced vessels and inhibition of the vascular leakiness that accompanies VEGF-E–induced angiogenesis. These results show that full-length PDGF-D is activated in tissues and is capable of increasing interstitial fluid pressure and macrophage recruitment and the maturation of blood vessels in angiogenic processes.
- Published
- 2004
- Full Text
- View/download PDF
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