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Sökning: WFRF:(Lind Britta)

  • Resultat 1-10 av 61
  • [1]234567Nästa
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1.
  • Wagstrom, Elle, et al. (författare)
  • The Cardiac State Diagram As A Novel Approach For The Evaluation Of Pre- And Post-Ejection Phases Of The Cardiac Cycle In Asphyxiated Fetal Lambs
  • 2013
  • Ingår i: Ultrasound in Medicine and Biology. - Elsevier. - 0301-5629. ; 39:9, s. 1682-1687
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to investigate myocardial wall motion using echocardiography and color-coded tissue velocity imaging and to generate a cardiac state diagram for evaluation of the duration of the pre- and post-ejection phases in asphyxiated fetal lambs. Six near-term lambs were partly exteriorized and brought to cardiac arrest through asphyxia. Echocardiography measurements were recorded simultaneously with arterial blood sampling for lactate and blood gases. All fetal lambs exhibited prolongation of the pre- and post-ejection phases at the time when the most pronounced changes in lactate concentration and pH occurred. The mean change in duration of the pre- and post-ejection phases for all fetal lambs was 36 +/- 7 ms (p < 0.002) and 77 +/- 17 ms (p < 0.019), respectively, and the percentage change was 50% (p < 0.001) and 38% (p < 0.049), respectively. As asphyxia progressed in fetal lambs, the duration of the pre- and post-ejection phases increased. The cardiac state diagram has the potential to be a comprehensible tool for detecting fetal asphyxia. (E-mail: elle.wagstrom@karolinska.se) (C) 2013 World Federation for Ultrasound in Medicine & Biology.
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2.
  • Bjällmark, Anna, et al. (författare)
  • Differences in myocardial velocities during supine and upright exercise stress echocardiography in healthy adults
  • 2009
  • Ingår i: Clinical Physiology and Functional Imaging. - 1475-0961 .- 1475-097X. ; 29:3, s. 216-223
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Tissue Velocity Imaging (TVI) is a method for quantitative analysis of longitudinal myocardial velocities, which can be used during exercise and pharmacological stress echocardiography. It is of interest to evaluate cardiac response to different types of stress tests and the differences between upright and supine bicycle exercise tests have not been fully investigated. Therefore, the aim of this study was to compare cardiac response during supine and upright exercise stress tests. Twenty young healthy individuals underwent supine and upright stress test. The initial workload was set to 30 W and was increased every minute by a further 30 W until physical exhaustion. Tissue Doppler data from the left ventricle were acquired at the end of every workload level using a GE Vivid7 Dimension system (&gt; 200 frames s(-1)). In the off-line processing, isovolumic contraction velocity (IVCV), peak systolic velocity (PSV), isovolumic relaxation velocity (IVRV), peak early diastolic velocity (E') and peak late diastolic velocity (A') were identified at every workload level. No significant difference between the tests was found in PSV. On the contrary, E' was shown to be significantly higher (P &lt; 0.001) during supine exercise than during upright exercise and IVRV was significantly lower (P &lt; 0.001) during supine exercise compared to upright exercise. Upright and supine exercise stress echocardiography give a comparable increase in measured systolic velocities and significant differences in early diastolic velocities.</p>
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3.
  • Bjällmark, Anna, et al. (författare)
  • Differences in myocardial velocities during supine and upright exercise stress echocardiography in healthy adults
  • 2009
  • Ingår i: Clinical Physiology and Functional Imaging. - 1475-0961 .- 1475-097X. ; 29:3, s. 216-223
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Tissue Velocity Imaging (TVI) is a method for quantitative analysis of longitudinal myocardial velocities, which can be used during exercise and pharmacological stress echocardiography. It is of interest to evaluate cardiac response to different types of stress tests and the differences between upright and supine bicycle exercise tests have not been fully investigated. Therefore, the aim of this study was to compare cardiac response during supine and upright exercise stress tests. Twenty young healthy individuals underwent supine and upright stress test. The initial workload was set to 30 W and was increased every minute by a further 30 W until physical exhaustion. Tissue Doppler data from the left ventricle were acquired at the end of every workload level using a GE Vivid7 Dimension system (&gt; 200 frames s(-1)). In the off-line processing, isovolumic contraction velocity (IVCV), peak systolic velocity (PSV), isovolumic relaxation velocity (IVRV), peak early diastolic velocity (E') and peak late diastolic velocity (A') were identified at every workload level. No significant difference between the tests was found in PSV. On the contrary, E' was shown to be significantly higher (P &lt; 0.001) during supine exercise than during upright exercise and IVRV was significantly lower (P &lt; 0.001) during supine exercise compared to upright exercise. Upright and supine exercise stress echocardiography give a comparable increase in measured systolic velocities and significant differences in early diastolic velocities.</p>
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4.
  • Bjällmark, Anna, et al. (författare)
  • Effects of hemodialysis on the cardiovascular system : Quantitative analysis using wave intensity wall analysis and tissue velocity imaging
  • 2010
  • Ingår i: Heart and Vessels. - 0910-8327 .- 1615-2573.
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Cardiovascular disease is the leading cause of death in patients with end stage renal disease (ESRD). The aim of this study was to investigate the changes in cardiovascular function induced by a single session of hemodialysis (HD) by the analysis of cardiovascular dynamics using wave intensity wall analysis (WIWA) and of systolic and diastolic myocardial function using tissue velocity imaging (TVI). Grey-scale cine loops of the left common carotid artery, conventional echocardiography and TVI images of the left ventricle were acquired before and after HD in 45 patients (17 women, mean age 54) with ESRD. The WIWA indexes, W<sub>1</sub> preload-adjusted W<sub>1</sub>, W<sub>2</sub> and preload-adjusted W<sub>2</sub>, and the TVI variables, isovolumic contraction velocity (IVCV), isovolumic contraction time (IVCT), peak systolic velocity (PSV), displacement, isovolumic relaxation velocity (IVRV), isovolumic relaxation time (IVRT), peak early diastolic velocity (E’) and peak late diastolic velocity (A’), were compared before and after HD. The WIWA measurements showed significant increases in W<sub>1</sub> (p &lt; 0.05) and preload-adjusted W<sub>1</sub> (p &lt; 0.01) after HD. W<sub>2 </sub>was significantly decreased (p &lt; 0.05) after HD, whereas the change in preload-adjusted W<sub>2</sub> was not significant. Systolic velocities, IVCV (p &lt; 0.001) and PSV (p &lt; 0.01), were increased after HD, whereas the AV-plane displacement were decreased (p &lt; 0.01). For the measured diastolic variables, E’ was significantly decreased (p &lt; 0.01) and IVRT was significantly prolonged (p &lt; 0.05), after HD. A few correlations were found between WIWA and TVI variables. The WIWA and TVI measurements indicate that a single session of HD improves systolic function. The load dependency of the diastolic variables seems to be more pronounced than for the systolic variables. Preload-adjusted wave intensity indexes may contribute in the assessment of true LV contractility and relaxation.</p>
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5.
  • Bjällmark, Anna, et al. (författare)
  • Effects of hemodialysis on the cardiovascular system: Quantitative analysis using wave intensity wall analysis and tissue velocity imaging
  • 2010
  • Ingår i: Heart and Vessels. - 0910-8327 .- 1615-2573.
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Cardiovascular disease is the leading cause of death in patients with end stage renal disease (ESRD). The aim of this study was to investigate the changes in cardiovascular function induced by a single session of hemodialysis (HD) by the analysis of cardiovascular dynamics using wave intensity wall analysis (WIWA) and of systolic and diastolic myocardial function using tissue velocity imaging (TVI). Grey-scale cine loops of the left common carotid artery, conventional echocardiography and TVI images of the left ventricle were acquired before and after HD in 45 patients (17 women, mean age 54) with ESRD. The WIWA indexes, W<sub>1</sub> preload-adjusted W<sub>1</sub>, W<sub>2</sub> and preload-adjusted W<sub>2</sub>, and the TVI variables, isovolumic contraction velocity (IVCV), isovolumic contraction time (IVCT), peak systolic velocity (PSV), displacement, isovolumic relaxation velocity (IVRV), isovolumic relaxation time (IVRT), peak early diastolic velocity (E’) and peak late diastolic velocity (A’), were compared before and after HD. The WIWA measurements showed significant increases in W<sub>1</sub> (p &lt; 0.05) and preload-adjusted W<sub>1</sub> (p &lt; 0.01) after HD. W<sub>2 </sub>was significantly decreased (p &lt; 0.05) after HD, whereas the change in preload-adjusted W<sub>2</sub> was not significant. Systolic velocities, IVCV (p &lt; 0.001) and PSV (p &lt; 0.01), were increased after HD, whereas the AV-plane displacement were decreased (p &lt; 0.01). For the measured diastolic variables, E’ was significantly decreased (p &lt; 0.01) and IVRT was significantly prolonged (p &lt; 0.05), after HD. A few correlations were found between WIWA and TVI variables. The WIWA and TVI measurements indicate that a single session of HD improves systolic function. The load dependency of the diastolic variables seems to be more pronounced than for the systolic variables. Preload-adjusted wave intensity indexes may contribute in the assessment of true LV contractility and relaxation.</p>
  •  
6.
  • Bjällmark, Anna, et al. (författare)
  • Ultrasonographic strain imaging is superior to conventional non-invasive measures of vascular stiffness in the detection of age-dependent differences in the mechanical properties of the common carotid artery
  • 2010
  • Ingår i: European Journal of Echocardiography. - 1525-2167 .- 1532-2114. ; 11:7, s. 630-636
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Aims: Elastic properties of large arteries have been shown to deteriorate with age and in the presence of atherosclerotic vascular disease. In this study, the performance of ultrasonographic strain measurements was compared to conventional measures of vascular stiffness in the detection of age-dependent differences in the elastic properties of the common carotid artery.</p><p>Methods and results: In 10 younger (25-28 years, 4 women) and 10 older (50-59 years, 4 women) healthy individuals, global and regional circumferential and radial strain variables were measured in the short-axis view of the right common carotid artery using ultrasonographic two-dimensional (2D) strain imaging with recently introduced speckle tracking technique. Conventional elasticity variables, elastic modulus (E<sub>p</sub>) and β stiffness index, were calculated using M-mode sonography and non-invasive blood pressure measurements. Global and regional circumferential systolic strain and strain rate values were significantly higher (p &lt; 0.001, p &lt; 0.01 for regional late systolic strain rate) in the younger individuals, whereas the values of conventional elasticity variables in the same group were lower (p &lt; 0.05). Among all strain and conventional elasticity variables, principal component analysis and its regression extension identified only circumferential systolic strain variables as contributing significantly to the observed discrimination between the younger and older age groups.</p><p>Conclusion: Ultrasonographic 2D-strain imaging is a sensitive method for the assessment of elastic properties in the common carotid artery, being in this respect superior to conventional measures of vascular elasticity. The method has potential to become a valuable non-invasive tool in the detection of early atherosclerotic vascular changes.</p>
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7.
  • Bjällmark, Anna, et al. (författare)
  • Ultrasonographic strain imaging is superior to conventional non-invasive measures of vascular stiffness in the detection of age-dependent differences in the mechanical properties of the common carotid artery
  • 2010
  • Ingår i: European Journal of Echocardiography. - 1525-2167 .- 1532-2114. ; 11:7, s. 630-636
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Aims: Elastic properties of large arteries have been shown to deteriorate with age and in the presence of atherosclerotic vascular disease. In this study, the performance of ultrasonographic strain measurements was compared to conventional measures of vascular stiffness in the detection of age-dependent differences in the elastic properties of the common carotid artery.</p><p>Methods and results: In 10 younger (25-28 years, 4 women) and 10 older (50-59 years, 4 women) healthy individuals, global and regional circumferential and radial strain variables were measured in the short-axis view of the right common carotid artery using ultrasonographic two-dimensional (2D) strain imaging with recently introduced speckle tracking technique. Conventional elasticity variables, elastic modulus (E<sub>p</sub>) and β stiffness index, were calculated using M-mode sonography and non-invasive blood pressure measurements. Global and regional circumferential systolic strain and strain rate values were significantly higher (p &lt; 0.001, p &lt; 0.01 for regional late systolic strain rate) in the younger individuals, whereas the values of conventional elasticity variables in the same group were lower (p &lt; 0.05). Among all strain and conventional elasticity variables, principal component analysis and its regression extension identified only circumferential systolic strain variables as contributing significantly to the observed discrimination between the younger and older age groups.</p><p>Conclusion: Ultrasonographic 2D-strain imaging is a sensitive method for the assessment of elastic properties in the common carotid artery, being in this respect superior to conventional measures of vascular elasticity. The method has potential to become a valuable non-invasive tool in the detection of early atherosclerotic vascular changes.</p>
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8.
  • Bjällmark, Anna, et al. (författare)
  • Velocity tracking - a novel method for quantitative analysis of longitudinal myocardial function
  • 2007
  • Ingår i: Journal of the American Society of Echocardiography. - Elsevier. - 0894-7317 .- 1097-6795. ; 20:7, s. 847-856
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Doppler tissue imaging is a method for quantitative analysis of longitudinal myocardial velocity. Commercially available ultrasound systems can only present velocity information using a color Dopplerbased overlapping continuous color scale. The analysis is time-consuming and does not allow for simultaneous analysis in different projections. We have developed a new method, velocity tracking, using a stepwise color coding of the regional longitudinal myocardial velocity. The velocity data from 3 apical projections are presented as static and dynamic bull's-eye plots to give a 3-dimensional understanding of the function of the left ventricle. The static bull's-eye plot can display peak systolic velocity, late diastofic tissue velocity, or the sum of peak systolic velocity and early diastolic tissue velocity. Conversely, the dynamic bull's-eye plot displays how the myocardial velocities change over one heart cycle. Velocity tracking allows for a fast, simple, and hituitive visual analysis of the regional longitudinal contraction pattern of the left ventricle with a great potential to identify characteristic pathologic patterns.</p>
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9.
  • Bjällmark, Anna, et al. (författare)
  • Velocity tracking - a novel method for quantitative analysis of longitudinal myocardial function
  • 2007
  • Ingår i: Journal of the American Society of Echocardiography. - Elsevier. - 0894-7317 .- 1097-6795. ; 20:7, s. 847-856
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Doppler tissue imaging is a method for quantitative analysis of longitudinal myocardial velocity. Commercially available ultrasound systems can only present velocity information using a color Dopplerbased overlapping continuous color scale. The analysis is time-consuming and does not allow for simultaneous analysis in different projections. We have developed a new method, velocity tracking, using a stepwise color coding of the regional longitudinal myocardial velocity. The velocity data from 3 apical projections are presented as static and dynamic bull's-eye plots to give a 3-dimensional understanding of the function of the left ventricle. The static bull's-eye plot can display peak systolic velocity, late diastofic tissue velocity, or the sum of peak systolic velocity and early diastolic tissue velocity. Conversely, the dynamic bull's-eye plot displays how the myocardial velocities change over one heart cycle. Velocity tracking allows for a fast, simple, and hituitive visual analysis of the regional longitudinal contraction pattern of the left ventricle with a great potential to identify characteristic pathologic patterns.</p>
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10.
  • Bydén, Stefan, 1951-, et al. (författare)
  • Mark - Människa -Miljö
  • 2004
  • Bok (övrigt vetenskapligt)abstract
    • Boken handlar om hur marken formats och påverkats av spadar och grävskopor, mular och harvar, kemikalier och sura regndroppar. Den fjärde upplagan har reviderade texter som ingående behandlar marken ur alla aspekter: markegenskaper, kulturlandskapet, skogsbruk, exploatering, planering och lagar, naturvård, information m.m. Boken är rikligt illustrerad med foton, diagram, teckningar och kartor. Boken är ett samarbete mellan Stockholms och Göteborgs universitet. Författarna är verksamma inom högskolan eller annan utbildning.
  •  
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