Processing blood pressure and transcranial doppler signals

Quick Start

BP-Doppler module is designed for rapid identification of beat-to-beat systolic, diastolic, and mean values from pulsatile waveforms.  If you have already analysed the ECG then this is done by:

  • Activating the channels.
  • Selecting the channel that corresponds to blood pressure or Doppler waveforms.
  • Checking that the systolic, mean, and diastolic values have been identified.
  • Clicking OK to store results.
  • Exist the module and analyse other signals or SAVE the file.

We recommend that the ECG is analysed first so that the exact timing of waveform features are gated relative to the cardiac cycle.  The most accurate way to gate cardiac activity is the ECG. If you do not have an ECG signal you may consider gating according to blood pressure or some other pulsatile signal.  This can be done by first analysing the pulsatile waveform  using the ECG module. However, waveform signals are influenced by wave-reflection so the results can be less accurate. We do not recommended it for heart rate variability or baroreflex sensitivity analysis.

Blood Pressure Calibration Correction

Blood Pressure devices often have an automatic calibration feature. This is important for accuracy of data but theres nothing more annoying than forgetting to turn off the calibration and it ruining your experimental data. We can now quickly remove this section to ensure it does not affect your blood pressure metrics.

Control definitions

ControlFunction
ChannelActivates the channel
Channel selectSpecifies the channel that corresponds to blood pressure or Doppler waveforms.
DelayTime shift to account for signal delays. Default is 0.
WindowSpecifies the time window to identify the systolic, diastolic, and mean values. Default is 2.

Modify the Window parameter if necessary to optimise detection of systolic and diastolic values.

This control applies to all channels.

Processing gas signals

The Gases module is designed to detect inspired and end-tidal gas concentrations of O2 and CO2 respectively.