Stress Echo
Vivid S5/Vivid S6 User Manual 219
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local tethering, reflecting contraction in surrounding segments.
Conversely, a normal segment may have its velocity reduced
by an adjacent segment with reduced velocity. This tethering
effect may decrease the sensitivity for single vessel disease,
but nonetheless the sensitivity and specificity of the cut-offs are
approximately 80% (see "References" on page 224).
Three different analysis tools based on TVI data are available:
• "Vpeak measurement" on page 220, enables the display of
a tissue velocity trace for a selected region of a previously
scored segment through the entire heart cycle. In addition
Vpeak is color-coded on the 2D image. From the velocity
trace, the user can estimate the peak systolic velocity (see
"References" on page 224).This tool is available in views
from peak levels only and only when a segment has been
scored in one of these views.
• "Tissue Tracking" on page 223, enables visualization of the
systolic contraction of the heart by color-coding the
myocardial displacement through the systole.
• "Quantitative analysis" on page 223, enables further
quantitative analysis based on multiple tissue velocity
traces.
The quantitative analysis is described in Chapter 8,
"Quantitative Analysis" on page 375.
Accessing QTVI Stress analysis tools
The three QTVI Stress analysis tools are entered by pressing a
dedicated button on the scoring diagram (see Figure 5-11) of
the selected view. Only views with TVI data acquired will
display QTVI Stress tools buttons on the respective diagrams.
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