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6. Stored ECG recordings

6.1 Recording display in the 'ECG ruler'

The curves are displayed with base line correction. If the base line correction cannot be done, because the recording is too noisy, incomplete, or the patient probably had a pacemaker, and an error message appears:
"Baseline correction failed"

You can perform measurements on the curve displayed in the ECG rulers with the help of the markers. The top right hand side of the window displays the average heart rate (HR), below it the time interval between the markers in msec, and the heart rate that you would get if you regard this time interval as the RR distance.

Using Frank placement, 2D and 3D vectorgraphs are available.

You can compare the specific leads of up to 6 rest or stress test recordings. If there are more recordings selected, only the first 6 will appear in the comparison. The program displays the same lead of the selected records. Select another type of lead from the Leads menu.

2. Median comparison

Menu: Record / Compare

The program displays, in case of a 6 channel lead maximal 7, in case of a 3 channel lead maximal 4 recording's medians at a time. If you have selected several recordings, use [PgUp], [PgDown] keys to scroll forward or backwards. The median cells display the average beat of the recordings, the header of the columns contains the heart rate (HR) calculated from the given curve, the date of the recording and in case of a stress test series information relating to load phases and time values. You can magnify the median cells with the mouse-click. Above the magnified picture the program displays the global parameters besides it the parameters characteristic to the lead.

You can analyze and compare the medians on a much more vividly descriptive way by viewing them all together: Cardiax can put together the related medians in a 3D-figure. Medians from different recordings appear one after another. It is easy to see the differences in the length of the QRS-complex, the T-wave, etc. Medians from every lead can be examined this way.

Menu: Mode / 3D-median compare

The picture below illustrates a 3D-median from the V1 lead:

6.3 The Frank ECG vector

Menu: Mode / Vector

The Cardiax program can display the vector ECG from the 'Frank' ECG recording. You need the special placement of the precordial electrodes in order to make a 'Frank' ECG recording (see Appendix C.)

The 'Frank' recording displays the orthographic projection of the ECG vector in the X, Y and Z lead. The program creates and displays the vector diagram from the segment marked out in the ECG ruler by the markers.

The left window shows the frontal, horizontal and sagittal projection, the right window shows the 3-D curve. You can rotate the 3D diagram in any direction and toggle on/off the 35 Hz filter.

6.4 Replay of recordings

Mode / Playback displays the stored recordings in a form that is actually a simulation of the monitoring. All functions valid during the monitoring are also valid here, except the recording length.

6.5 Data export to MS-Excel

Menu: Mode / File export

Thanks to the file export feature you can use the data of your recordings with Microsoft Excel, to make presentations or statistics, etc. The exported file is a plain text file, with the data cells in the table separated by semicolons. You can export all of the following:

the recording itself - every point of the curve is represented by an integer number,
medians, counted from the curve
result of the diagnostics and the parameter table

File export can be started by Mode / File export from Ruler and from the window of the Medians or by pressing the Export button in the Diagnosis window.

6.6 Longtime recordings

By "Longtime" saved ECG curves besides the previously mentioned measuring and other fuctions it is possible to get a view of the whole recording. This is called the Navigation window.

Menu: Mode / Navigaton window
It will display a new window with a single channel ECG picture which is, depending on it's length and sampling rate, displayed all or can be scrolled. Orientation is made easier by the timestamps on the left.
Using the icon, it is possible to switch to 12 channels display. The arrow symbols control the time and amplitude sampling rate, the lead buttons change the leading to be displayed in the previously mentioned way.

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