SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Bjällmark Anna) "

Sökning: WFRF:(Bjällmark Anna)

Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  •  
2.
  •  
3.
  •  
4.
  • Bjällmark, Anna, et al. (författare)
  • A system to quantify and visualize ventricular rotation pattern of the heart
  • 2009
  • Patent (övrigt vetenskapligt)abstract
    • <p>Different modalities have been used to describe the rotational motion of the ventricles of the heart and studies have indicated LV twist to be an additional integral component in LV function. So far, only amplitudes and timings of rotation have been reported, whereas no method is available to fully describe the rotation pattern of the ventricles. The object of the present application is to achieve a system that presents a novel way to quantify and visualize the ventricular rotation pattern of the heart. We present a novel method that assesses and describes the rotation pattern by calculating the rotation axis of the ventricle. Non- invasive image acquisition is required to collect rotation values from different positions of the myocardium. Thereafter, a kinematic model of a ventricle is constructed to determine the rotation planes at different levels of the heart. The motion of the rotation planes are visualized by plotting the normal vectors of the planes over time, i.e. the rotation axis of the planes. This new method is different to all other methods used today for assessing cardiac function, as it does not describe the amplitude of a motion but the relationship in motion between different parts within a ventricle. Preliminary results indicate that the rotation axis is more sensitive to changes in the rotation pattern than conventional measurements of ventricular rotation. This new method could be used for early detection of cardiac diseases and for selection of patients for and optimization of cardiac resynchronization therapy.</p>
  •  
5.
  • Bjällmark, Anna, et al. (författare)
  • A system to quantify and visualize ventricular rotation pattern of the heart
  • 2009
  • Patent (övrigt vetenskapligt)abstract
    • <p>Different modalities have been used to describe the rotational motion of the ventricles of the heart and studies have indicated LV twist to be an additional integral component in LV function. So far, only amplitudes and timings of rotation have been reported, whereas no method is available to fully describe the rotation pattern of the ventricles. The object of the present application is to achieve a system that presents a novel way to quantify and visualize the ventricular rotation pattern of the heart. We present a novel method that assesses and describes the rotation pattern by calculating the rotation axis of the ventricle. Non- invasive image acquisition is required to collect rotation values from different positions of the myocardium. Thereafter, a kinematic model of a ventricle is constructed to determine the rotation planes at different levels of the heart. The motion of the rotation planes are visualized by plotting the normal vectors of the planes over time, i.e. the rotation axis of the planes. This new method is different to all other methods used today for assessing cardiac function, as it does not describe the amplitude of a motion but the relationship in motion between different parts within a ventricle. Preliminary results indicate that the rotation axis is more sensitive to changes in the rotation pattern than conventional measurements of ventricular rotation. This new method could be used for early detection of cardiac diseases and for selection of patients for and optimization of cardiac resynchronization therapy.</p>
  •  
6.
  • 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>
  •  
7.
  • 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>
  •  
8.
  • 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>
  •  
9.
  • 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>
  •  
10.
  •  
Skapa referenser, mejla, bekava och länka
Åtkomst
fritt online (13)
Typ av publikation
tidskriftsartikel (50)
konferensbidrag (38)
patent (4)
doktorsavhandling (3)
annan publikation (1)
Typ av innehåll
refereegranskat (62)
övrigt vetenskapligt (59)
populärvet., debatt m.m. (1)
Författare/redaktör
Bjällmark, Anna, (94)
Larsson, Matilda, (41)
Brodin, Lars-Åke (31)
Larsson, M, (25)
Winter, Reidar (16)
Lind, Britta, (15)
visa fler...
Maksuti, Elira, (13)
Brodin, L-Å (11)
Caidahl, Kenneth (10)
Nowak, Jacek (10)
Lind, B, (9)
D'Hooge, J (8)
Winter, R (7)
Broome, Michael (7)
Widman, Erik, (7)
Caidahl, K (6)
Falkmer, Marita, (6)
Larsson, Matilda, 19 ... (6)
Nowak, J. (5)
Gustafsson, U, (5)
Lindholm, B, (5)
Falkmer, Torbjörn, (5)
Kremer, F. (5)
Lindholm, Bengt (5)
Larsson, Malin K., (5)
Larsson, David, (5)
Seeberger, A (5)
Larsson, Malin, 1983 ... (5)
Paradossi, Gaio (4)
Peolsson, Michael (4)
Nordenfur, Tim, 1990 ... (4)
Shahgaldi, Kambiz (4)
Seeberger, Astrid (4)
Westholm, Carl (4)
Jacobsen, Per (4)
Kuznetsova, T (4)
Maksuti, E (4)
Riella, M (4)
Waldenstrom, A. (3)
Brodin, L A, (3)
Szummer, Karolina, (3)
Falkmer, Torbjörn, 1 ... (3)
Lindqvist, P, (3)
Brodin, Lars-Åke, Pr ... (3)
Westholm, C (3)
Brodin, Lars-Ake, (3)
Hayashi, Shirley (3)
da Silva, Cristina, (3)
Johnson, Jonas, (3)
Seeberg, Astrid, (3)
visa färre...
Lärosäte
Högskolan i Jönköping (61)
Kungliga Tekniska Högskolan (34)
Linköpings universitet (1)
Språk
Engelska (94)
Svenska (1)
Forskningsämne (UKÄ/SCB)
Teknik (63)
Medicin och hälsovetenskap (28)
Samhällsvetenskap (5)
Naturvetenskap (1)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy