Reference values of right XXXX imaging by two-dimensional speckle tracking.

@entity4032 @entity8639 @entity6475 @entity85
BACKGROUND: The role of speckle tracking in the assessment of @entity4032 ( @entity4032 ) deformation dynamics has not been established yet. The reference ranges of @entity4032 @entity6475 indices were measured by speckle tracking in a population of normal subjects. METHODS: In 84 healthy individuals, peak @entity6475 (PALS), peak atrial contraction strain (PACS), and time to peak @entity6475 (TPLS) were measured using a six-segment model for the @entity4032 . Strain rate (SR) was also measured starting from the QRS-wave onset, peak positive (x-wave), first peak negative (y-wave), and second negative peak (z-wave). The time from the QRS onset was measured to each wave peak. RESULTS: Adequate tracking quality was achieved in 64% of segments analyzed. Inter- and intraobserver variability coefficients of measurements ranged between 6% and 11%. Global PALS was 49    13%, global TPLS was 363    59 msec, x-wave was 2.12    0.58 @entity8639 ) , y-wave was -1.91    0.63 @entity8639 ) , and z-wave was -2.18    0.78 @entity8639 ) . CONCLUSION: Speckle tracking is a feasible technique for the assessment of longitudinal myocardial @entity85 . Reference ranges of strain indices were reported.
