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The MLS310 Heart Rate Variability
(HRV) Module for Macintosh provides a comprehensive
set of tools for the analysis and display of variation in the interval
between heartbeats in human and animal electrocardiogram recordings.
The Heart Rate Variability (HRV) Module should be used with the latest version of Chart. Click here for the latest Chart Update for Macintosh.
Electrocardiograms or other heartbeat-related signals
can be recorded using the PowerLab
data acquisition system and changes in the heart rate
can be computed on-line using the analysis features of
Chart software. With the addition of the HRV Module, the
analysis of the variability in this data is possible.
When using the HRV Module, a threshold detector is used to detect the R waves
in the raw ECG data and generate RR intervals that are
classified as normal, ectopic or artifact.
From the classified
RR intervals a range of HRV plots, spectral measurements,
statistical histograms and reports are calculated and
displayed.
These include:
- Poincaré plot
- Period histogram
- Delta NN histogram
- Tachogram
- Spectrum
- Statistical report
Tachogram
Successive RR interval values are plotted against the ‘beat
number’. Horizontal dotted lines indicate the current
limits for ectopic and artifact recognition. These lines
can be dragged to alter the limits.
Poincaré
Plot
Each RR interval is plotted, against its preceding
RR interval, in a scatter plot with the mean (central
point) and standard deviation (ellipse) are displayed
in the window.
The window also displays the RR interval classification
boxes (blue for the normal/ectopic limit, red for
the ectopic/artifact limit). These limits can be
adjusted by dragging the boxes.
Spectrum
The Spectrum window displays the power spectrum of time-based
Tachogram, also
referred to as the 'Spectrum of Intervals'.
Draggable vertical lines indicate limits of
LF and HF
regions of the spectrum.
The HRV Module allows you to:
- Define artifact/ectopic interval classification limits
- Exclude or include ectopic beats from analysis
- Add R waves
- Delete R waves which have incorrectly created short
artifacts
- Adjust histogram bin size
- Generate ECG data with specified RR interval variation (Mac
only)
For more information about this Module, please contact your nearest
ADInstruments representative.
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