Stress test system

 

• Automatic BP recording
• High safety and fault-tolerance
• Pulse oxymetry option
• Additional science options: analysis of rhythm variability, late ventricular heart potentials, microvolt T-wave alternation

System description

• portable 12-channel ECG recorder, cable, set of ECG electrodes, interface board and software for functional heart tests
  
• wireless compact 12-channel ECG block is set on the patient and provides ECG transfer to the computer (optionally)
• SpO2 monitor (optionally)

Taking into account hazard of stress tests itself and the necessity of computer and software reliability the system is equipped with:

• industrial 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 real-time operation

The system allows ECG recoding in 12 standard leads using standard or wireless recorder. During the stress test load is automatically controled according to the selected protocol. Programming of user-defined protocols is also available. 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 achive high and stable quality of ECG record, exact defining of  ST-segment depression and elevation for "alarm" signal allows adapting of studies program to individual feature of the patient or to particular aims of studies.

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

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

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

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

System operating in data analyzing mode

After the test received data is automatical analyzed. It forms text summary, full report and trends. It is available to insert data which can't be analysed automatically and final decision on test redults.

Besides automatic analysis, any fragment of 12 channel of ECG record can be treated visually with necesary measurements made manually. For convenient estimating of arrhythmia full disclosure report pf ECG is provided.