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5. ECG recording

5.1 Monitoring

You can monitor the ECG with the Cardiax system if you have a connected and enabled Cardiax device. During monitoring, the ECG curve is displayed on the screen and you can save selected temporal segments of data. You can turn on/off the tremor filter, the sound of the QRS detector or change the lead system, the number of the displayed channels, paper speed, time resolution, amplitude gain, and the length of the recording to be stored.

Start the monitoring

Menu: Record / ECG record
Hotkey: [F9]

Note: First you should select your device in Setup / ECG menu. If it is 'Demo no ECG', you get a simulated monitoring.

5.2 Time resolution, amplitude gain, QRS-sound and filter

The time and amplitude resolution of the ECG recording starts with the parameters set in the Setup, but these can be changed during the recording.

Time resolution:
Menu: Set / Time resolution
Hotkeys: [-], [+]
Speed can be 25, 50, 100 or 200 mm/s.

Amplitude:
Menu: Set / Amplitude
Hotkeys: [Up], [Down]
Amplitude can be 5, 10, or 20 mm/mV.

It is possible to toggle the sound detecting the QRS complexes and the 35 Hz tremor filter on/off.

Sound:
Menu: Set / Sound
Hotkey: [F6]

Filter:
Menu: Set / Filter
Hotkey: [F7]

Besides the 35Hz tremor filter there are other filters available. Enabling and disabling these is done through the Setup - ECG menu.
The average pulse (HR, 1/min) and the time between the last two R waves (RR, msec) can be seen in the top-right corner of the screen.

5.3 Selecting a lead system

The system supports three types of electrode placement, from which the following lead combinations can be displayed (see also Appendix C.):

1. Placing only the limb electrodes:

  • Limb: I, II, III, aVR, aVL, aVF
  • Cabrera: aVL, I, -aVR, II, aVF, III
  • Standard: I, II, III
  • Unipolar: aVR, aVL, aVF
The indication of the stored recording is 'Extremal'.

2. Standard placing of all of the 10 electrodes:

- the previous four, plus:
  • Precordial: V1, V2, V3, V4, V5, V6
  • Precordial 1-3: V1, V2, V3
  • Precordial 4-6: V4, V5, V6
  • Free order 3 leads (can be set in the 'ECG' window of the 'Setup')
  • Free order 6 leads (can be set in the 'ECG' window of the 'Setup')
  • 12 leads: I, II, II, aVR, aVL, aVF, V1...V6
  • Cabrera+Precordial: aVL, I, -aVR, II, aVF, III, V1...V6
The indication of the stored recording is 'Precordial'.

3. Frank placement of 10 electrodes:

- the first four, plus:
  • Frank: X,Y,Z
The indication of the stored recording is 'Frank'.

5.4 Storing the ECG recording

Menu: Mode / Save
Hotkey: [F9]
You can save the last 8, 16 or 32 sec of the actually recorded signal. The ECG curves are always stored without the 35 Hz filtration.

The length of the ECG to be stored can be specified by:

Menu: Set / Record length = 8/16/32
Hotkey: [F8]
Pressing [F8] repeatedly will cycle through the three options.

It is possible to continously save the whole ECG curve. To activate:
Menu: Mode / Continous save
It will cause the actually displayed curve to be stored continously on the storage device. The timer on the right side of the screen shows how much of ECG curve has been already saved by the program. Saving can be terminated any time by pressing Stop (green) button or by exiting the monitoring window. The hereby saved ECG will have the name "Longtime" in the list of ECG recordings.


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