Complex for stress test - (Astrocard Polysystem-FS)

Complex Polysystem-4FS is based on up-to-date methods of computer processing of electrophysiological signals and offers an advantage of analysis, graphic viewing and storing of received data, automation of researching process.

Polysystem-4FS is an universal electrocardiographic complex for various functional and medication tests (exercise stress test on bicycleergometer (various types of bicycleergometer) , treadmill, stress-echo, orthostatic test, static exercise tolerance test and etc).

Complex description

It includes:

  • dedicated portable 12-channel recodering block ECG, cable, set of ECG electrode, interface board for data inputting and software for functional heart tests
  • cordless compact 12-channel ECG block hat is set on the patient and provides continuous ECG transfer to the analyzing block (optionally)
  • SpO2 monitor (optionally)

Taking into account hazard of exercise tolerance test and correspondingly, the necessity of reliability growth of the computer and software, in complex are used:

  • dedicated fault-tolerant computer, which provides uninterrupted activity during long period of time in automatic mode
  • medical power unit, which provides compliance with medical requirements of electrical safety and radio noise
  • Windows Embedded operating system, specially established for productivity and accident prevention with high reliability level

System setting

System of investigations planning allows choosing between ready protocols of stress changing (for treadmill) or creating protocols at user's opinion (for bicycleergometer). The ability of arbitrary setting of allowable ranges of monitored changes during physiological indices measurements and also criteria of ST-segment depression and elevation for "alarm" signal allows adapting of investigations program to individual feature of the patient or to particular aims of investigations.

Complex real-time operation

Complex allows ECG recoding in 12 standard leads. Due to the digital signal processing, original method of QRS-complex defining and correction of the isoline shifting, also selective averaging of sinus QRS-T complexes achieve high and stable quality of ECG record, exact defining of ST-segment depression and elevation including "alarm" signal. Complex allows SpO2 recording and analyzing during all investigation (optionally). During investigation it's possible to record and analysis of late Ventricular heart potentials (optionally) and variability HR.

On the screen there are several monitor windows which help to estimate measuring parameters and to control monitors during whole measurement:

  • active ECG window provides continuous view of active ECG on 12 ECG leads on two speeds of oscillogram movements ( 50 25mm/s, sets arbitrary) and allows visual verification of ECG
  • Averaging window shows averaged QRS-T complexes at 8 s in 1-3 selected leads. Image of averaged complexes in initial state may be saved on the screen while viewing changing current complexes. This allows exact visual estimation of the ST-segment shifting
  • trend monitor forms up trends of BP, HR, and ST-segment level in real time in the lead which was selected at the beginning of the measurement. Also it forms a trend of ventricular premature beats frequency

On the monitor there is also an index of the lead where ST depression or elevation was found; and index of current stress. During the whole measurement the audiovisual "prompter" is available. It indicates the moments of stress switching and BP measurements.

Complex Polysystem-4FS provides total logging of the whole measurement of the hard disk.

Complex operating in data analyzing mode

After measuring complex provides automatic analysis of received data and form summary, detailed measurement report and trends (graphs of changes in the main parameters during the whole measurement). Report forming allows adding data manually which is beyond automatic processing; as well as final conclusion on test results.

Besides automatic processing any section of 12-channel ECG record may undergo visual verification with nessecary manual changes. Mode of full ECG disclosure report is available for easy estimation of arrhythmia.


The complex provides high-quality ECG prints on the laser printer with speed from 5 to 400 mm/s on A4 sheets.

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