Copyright © 2005, The European Society of Cardiology
Feasibility of strain and strain rate imaging for the assessment of regional left atrial deformation: A study in normal subjects
aDepartment of Cardiology, Cardiac Imaging Research, KU Leuven, University Hospital Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium
bDepartment of Cardiology, St. George's Hospital, London, UK
Received 23 November 2004; received in revised form 15 May 2005; accepted after revision 1 June 2005.
* Corresponding author. Tel.: +32 16 347565; fax: +32 16 344240. cristina.sirbu{at}uz.kuleuven.ac.be
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Abstract |
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Aims There are no data on the use of Myocardial Velocity Imaging (MVI) to study the left atrium (LA) wall deformation. The aims of this study were to assess the feasibility of measuring regional longitudinal strain/strain rate (
/SR) profiles in the LA wall, to define the normal values and to validate these measurements.
Methods and results MVI data were recorded in 40 healthy young individuals using a GE Vivid7 for the lateral, anterior and inferior LA walls. The peak /SR values and total values during the contractile, reservoir and conduit LA phases were measured. For the LA lateral wall, the total values were correlated with the LA volumetric indicators (LA active emptying fraction: LA AEF; LA expansion index: LA EI; and LA passive emptying fraction: LA PEF). The correlations were significant for all three periods: contractile (total vs. LA AEF, r=–0.78, P<0.001), reservoir (total vs. LA EI, r=0.43, P<0.01) and conduit (total vs. LA PEF, r=–0.46, P<0.005).
Conclusion SR/ imaging for the quantification of longitudinal myocardial LA deformation was shown to be feasible and the normal values were reported and validated. These data may improve the understanding of the LA pathophysiology.
Keywords: MVI; myocardial velocity imaging; SR; strain rate; ; strain; SPEQLE; Software Package for Echocardiographic Quantification Leuven; LA; left atrium; LV; left ventricle; Vpre A; left atrial volume pre-atrial contraction; Vmin; left atrial minimal volume; Vmax; left atrial maximal volume; LA AEF; left atrial active emptying fraction; LA EI; left atrial expansion index; LA PEF; left atrial passive emptying fraction; PE; pre-ejection; AE; atrial ejection; IVC; isovolumic contraction; IVR; isovolumic relaxation; EF; early ventricular filling; D; diastasis; CT; contractile period; ER; early reservoir period; LR; late reservoir period; CD; conduit period
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