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Aortic valve closure: relation to tissue velocities by Doppler and speckle tracking in normal subjects.

AIMS: The aim of this study is to resolve what event in velocity/time curves represents aortic valve closure (AVC) by comparing the timing of AVC visually seen in high frame rate B-mode images with simultaneously recorded apical tissue Doppler imaging (TDI) and speckle-tracking-based velocity/time c...

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Publicado en:European Journal of Echocardiography Vol. 9; no. 4; pp. 555 - 560
Autores principales: Aase SA, Torp H, Støylen A
Formato: research Journal Article
Publicado: Oxford University Press / USA Jul2008
Acceso en línea:Ver este registro en EBSCOhost
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      jtl: European Journal of Echocardiography
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      dt: Jul2008
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      pub: Oxford University Press / USA
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        10.1093/ejechocard/jen120
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        105803727
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        atl: Aortic valve closure: relation to tissue velocities by Doppler and speckle tracking in normal subjects.
      aug:
        au:
          Aase SA
          Torp H
          Støylen A
        affil: Department of Circulation and Medical Imaging, NTNU, ISB Medisinsk Teknisk Forskningssenter, NO-7489 Trondheim, Norway. sveinaaa@ntnu.no
      sug:
        subj:
          Aortic Valve Ultrasonography
          Aortic Valve Physiology
          Male
          Time Factors
          Human
          Male
      ab: AIMS: The aim of this study is to resolve what event in velocity/time curves represents aortic valve closure (AVC) by comparing the timing of AVC visually seen in high frame rate B-mode images with simultaneously recorded apical tissue Doppler imaging (TDI) and speckle-tracking-based velocity/time curves from normal subjects. METHODS AND RESULTS: A total of 73 recordings from 11 normal subjects were analysed. The acquisition frame rate was equal for both TDI and B-mode (mean 147.5 FPS). The study shows conclusively that the initial negative velocity spike at end-systole occurs before AVC, 26.7 +/- 6.2 ms before reference (P < 0.001). The event closest to the reference was the time point of zero velocity after the negative spike, 2.6 +/- 8.2 ms before reference. These events are related to the reference in the same way for velocity/time curves by speckle tracking, colour M-mode, and pulsed wave tissue Doppler. CONCLUSIONS: AVC in velocity/time curves should be positioned at the end of the negative spike after ejection. Establishing AVC from the correct event in velocity/time curves will ensure more consistent displacement, velocity, strain, and strain rate parameters.
      pubtype: Academic Journal
      doctype:
        research
        Journal Article
      ougenre: Article
    language: English
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