Two-Dimensional Speckle-Tracking Echocardiography of the Left Atrium: Feasibility and Regional Contraction and Relaxation Differences in Normal Subjects

The angle-independent technique of 2D-SpTr tracking can analyze regional LA ɛ and SR in 94% of normal subjects. Regional differences in LA contractility are consistently present. The annular regions, and especially the inferior wall have the highest values for LA ɛ and SR. The significance of these findings and their possible use in identifying disease states will require further study.