Extract overview

Getting Started

Extract is a tool for data visualisation, selection, and analysis.

To load files either drag and drop or navigate to the “Extracted” folder containing pre-processed files. These files should be located in your root folder (i.e. the folder where your original files are saved).

Visualise your data on the Extract dashboard and change data segments using the time slider.

Analysis workflows are listed under the workflows window.  Select by double clicking on the module of interest.

Saving results

This tutorial video takes you through the process of saving your results in the Extract module.

Home interface

ControlDefinition
RunLoads the data specified by the file path.
WorkflowsLists of current analysis modules.
Sampling freqDisplays the sampling frequency in Hertz.
Wave fileCheck this option to load raw waveform files (e.g. arterial blood pressure, doppler velocity waveforms).
BoldCheck this option to display data using bold lines.
CommentsCheck this option to display file annotations. This function is only available for file formats that store annotations.
Erase last entryErases the last exported data entry.
Time cursorDefines the time window to display.
Launches the help page.

Workflow Modules

ModulesFunction
Simple statisticsPerforms basic statistical calculations.
Pressure flow transfer functionDetermines the linear transfer function between beat-to-beat arterial blood pressure and beat-to-beat blood velocity time series.
Waveform transfer functionDetermines the linear transfer function between pairs of waveforms.
Carbon dioxide reactivityEstimates the vascular reactivity to carbon dioxide.
Pulse wave velocityEstimates the velocity at which the arterial pulse propagates through the arterial system.
Critical closing pressureEstimates the critical closing pressure defined as the internal pressure at which a blood vessel collapses and closes completely.
Autoregulation indexCalculates the cerebral autoregulatory index.
Pressure cardiac interval transfer functionDetermines the linear transfer function between beat-to-beat blood pressure and beat-to-beat cardiac intervals time series.
Heart rate variability (frequency domain)Estimates heart rate variability in the frequency domain.
Heart rate variability (time domain)Estimates heart rate variability in the time domain.
Sympathetic neural activity analysisDetermines the common physiological parameters associated with muscle sympathetic nerve recordings.
Power spectral analysisComputes the Power Spectrum of the input sequence.

Muscle sympathetic nerve activity

Muscle sympathetic nerve activity (MSNA) is recorded through the use of microneurography. This is the process of percutaneously inserting a tungsten microelectrode into a nerve to record action potentials.