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USER MANUAL DO-LBL-06035(L)
| MyoVista® Wavelet ECG (
wav
ECG™) 12-Lead Cardiac Testing Device
General Overview
The
MyoVista Wavelet Analysis, Algorithms and Statements
(see “C” on Figure 3-0) provide the
results of the
wav
ECG Analysis (with inputs from the MyoVista Energy Classification and MyoVista
Ventricular Indices, as well as other conventional measures such as T-Axis, sex, and age) and provide
statements that can be used to assist in determining the relative-risk of a patient having relaxation
abnormalities associated with LV diastolic dysfunction that may require further clinical testing,
evaluation and/or treatment .
The
MyoVista Ventricular Indices
(see “D” on Figure 3-0) represent the relative energy values of the
left and right ventricles at specific time points during repolarization (just prior to and after the T-Wave
peak) . The indices are displayed as a percentage of energy in relation to the peak energy detected
during the cardiac cycle (usually close to or at an R-Wave peak) . There are four Index values provided,
as well as numeric comparisons (differences and ratios) for these four measurements
The
MyoVista Energy Classification
(see “E” on Figure 3-0) provides an overall indication (i .e .
aggregation of information from all 12 leads) of relative energy levels detected during the test period
and reports this information in a simplified categorization of either “High”, “Moderate” or “Low” .
Detailed information on the MyoVista
wav
ECG Information is described below.
MyoVista Energy Waveform
Figure 3-1 . Shows an example of the MyoVista Energy Waveform after signal processing, using
Continuous wavelet transform and its relationship to the QRST (Q, R, S, and T-waves) complex .
Figure 3-1. MyoVista Energy Waveform
The color scaling provides a non-linear mapping of energy from 0 to 100% which represents the relative
level of energy detected from the heart at each point in time and frequency . Blue represents low energy,
red represents high energy, and intermediate energy levels are shown according to the red, blue,
green (RGB) color scale above (see the scale key on the left side of Figure 3-1) . The colors represent a
distribution of energy detected during the cardiac cycle rather than providing absolute values . The
horizontal axis (x-axis) is time and the vertical axis (y-axis) is frequency . The frequencies range from 3 Hz
at the bottom of the display to 200 Hz at the top using a non-linear scale .
This visual representation is provided to give context for the remainder of the wavelet measures and
statements provided by the MyoVista Device .
MyoVista Summary Statement and Indicators
The MyoVista Summary Statement and Indicators have a sensitivity of 74 .3% and a specificity of 72 .9% for
the detection of myocardial relaxation abnormalities associated with Left Ventricular diastolic dysfunction
(LVDD) based on the overall statistical performance of the Repolarization Measures Algorithm .
Note: See Appendix E- MyoVista
wav
ECG Analysis, Algorithms and Statistical Performance.