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  • 1.
    Gustafsson, Ulf
    et al.
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Lindqvist, Per
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Waldenström, Anders
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Apical circumferential motion of the right and the left ventricles in healthy subjects described with speckle tracking2008In: Journal of the American Society of Echocardiography, ISSN 0894-7317, E-ISSN 1097-6795, Vol. 21, no 12, p. 1326-1330Article in journal (Refereed)
    Abstract [en]

    Background

    The aim of this study was to determine whether right ventricular (RV) apical rotation could be of importance in RV function and compare this with left ventricular (LV) apical rotation.

    Methods

    Short-axis images at the apical level of both ventricles were simultaneously recorded in 14 healthy subjects (mean age, 62 ± 11 years).

    Results

    There was a significant difference in mean rotation between the two ventricles in the time interval between 50% of ejection and aortic valve closure (P < .05). At aortic valve closure, LV rotation was 10.9 ± 4.8° counterclockwise, and RV rotation was 1.1 ± 5.8° clockwise. The anterior and inferior parts of the right ventricle rotated in opposite directions toward the septum. The septal segments of both ventricles rotated inferiorly, thus likely reducing interventricular stress.

    Conclusion

    This study showed clear differences in apical rotation between the two ventricles. Whereas the left ventricle displayed uniform rotation, the right ventricle showed heterogeneous rotation, resulting overall in almost no rotation but in a “tightening belt” motion.

  • 2.
    Lindqvist, Per
    et al.
    Umeå University, Faculty of Medicine, Surgical and Perioperative Sciences, Clinical Physiology.
    Mörner, Stellan
    Karp, Kjell
    Umeå University, Faculty of Medicine, Surgical and Perioperative Sciences, Clinical Physiology.
    Waldenström, Anders
    New aspects of septal function by using 1-dimensional strain and strain rate imaging.2006In: Journal of the American Society of Echocardiography, ISSN 0894-7317, E-ISSN 1097-6795, Vol. 19, no 11, p. 1345-1349Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: The interventricular septum is a complex structure, both anatomically and functionally, which limits the use of Doppler tissue imaging in the assessment of radial septal function. In this study we investigated whether strain (epsilon) and epsilon rate (SR) imaging can improve the measurement of the septal function. METHODS: Thirty healthy participants (18 women; age 60 +/- 11 years, range 42-72) were randomly selected from the population. Systolic epsilon and SR measurements were made of the radial motion from right endocardial layer (RE), left endocardial layer (LE), and middle layer of septum. Furthermore, we also compared RE and longitudinal right ventricular free wall and left ventricular longitudinal and LE septal motion. RESULTS: In both the endocardial sampling sites, LE and RE, we found negative radial epsilon (myocardial shortening), -20.1 +/- 11.5% for RE and -25.0 +/- 14.1% for LE during systole. However, in the middle layer we found a positive radial epsilon (myocardial lengthening), +11.5 +/- 13.2%, significantly different from the two endocardial layers (P < .001 for both). SR was negative in the two endocardial layers and significantly higher for LE, (-2.9 +/- 1.8 1/s) than for RE (-1.2 +/- 1.8 1/s, P < .001) and positive for the middle layer (+1.1 +/- 1.0 1/s), significantly different in comparison with the two endocardial layers (P < .001). Finally, there was a higher longitudinal epsilon compared with radial endocardial epsilon for right ventricle (-26.5 +/- 11.5 vs -20.1 +/- 11.5, P < .05) whereas there was significantly higher left ventricular radial epsilon and SR compared with the longitudinal epsilon and SR (-25.0 +/- 14.1 vs -16.8 +/- 9.5, P < .05; and -2.9 +/- 1.8 vs -1.1 +/- 0.4, P < .001). CONCLUSION: Systolic epsilon and SR imaging indicate differences in the radial deformation in different layers of the interventricular septum, which might be explained by the complexity of the septal fiber arrays and function. It might also explain why using Doppler tissue imaging technique is limited in assessing radial myocardial septal velocities. Furthermore, these results suggest that longitudinal shortening dominates in the right ventricle whereas the radial shortening dominates in the left ventricle.

  • 3.
    Mörner, Stellan
    et al.
    Umeå University, Faculty of Medicine, Public Health and Clinical Medicine.
    Lindqvist, Per
    Umeå University, Faculty of Medicine, Public Health and Clinical Medicine.
    About the New Aspects of Septal Function by Using 1-Dimensional Strain and Strain Rate Imaging.2007In: Journal of the American Society of Echocardiography, ISSN 0894-7317, E-ISSN 1097-6795, Vol. 20, no 12, p. 1419-1420Article in journal (Refereed)
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