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

doi:10.1093/ejechocard/jen120

European Journal of Echocardiography Advance Access originally published online on March 20, 2008
European Journal of Echocardiography 2008 9(4):555-559; doi:10.1093/ejechocard/jen120

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

Svein A. Aase¹^,*, Hans Torp¹ and Asbjørn Støylen¹^,2

¹ Department of Circulation and Medical Imaging, NTNU, ISB Medisinsk Teknisk Forskningssenter, NO-7489 Trondheim, Norway
² Department of Cardiology, St Olav Hospital, Trondheim, Norway

Received 5 July 2007; accepted after revision 14 October 2007; online publish-ahead-of-print 20 March 2008.

^* Corresponding author. Tel: +47 73 55 04 19; fax: +47 73 59 86 13. E-mail address: sveinaaa{at}ntnu.no

Abstract

Aims: The aim of this study is to resolve what event in velocity/timecurves represents aortic valve closure (AVC) by comparing thetiming of AVC visually seen in high frame rate B-mode imageswith simultaneously recorded apical tissue Doppler imaging (TDI)and speckle-tracking-based velocity/time curves from normalsubjects.

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 initialnegative velocity spike at end-systole occurs before AVC, 26.7± 6.2 ms before reference (P < 0.001). The event closestto the reference was the time point of zero velocity after thenegative spike, 2.6 ± 8.2 ms before reference. Theseevents are related to the reference in the same way for velocity/timecurves by speckle tracking, colour M-mode, and pulsed wave tissueDoppler.

Conclusions: AVC in velocity/time curves should be positioned at the endof the negative spike after ejection. Establishing AVC fromthe correct event in velocity/time curves will ensure more consistentdisplacement, velocity, strain, and strain rate parameters.

Keywords: Heart; Echocardiography; End systole; Systolic time interval

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