MEDICAL COMPUTER SYSTEMS
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healthEXPRESS is a computer device, which is intended use for screening of heart condition and evaluation of body functional state.
healthEXPRESS realizes two methods: HeartVUE for measuring ECG microalternations and analyze of Heart Rate Variability for determination of the functional state. For carrying out of two this methods at once a patient is tested at rest either at sitting or lying position and patient’s ECG data are recorded by means of 4 electrodes put on limbs (leads I…aVF). An operator should choose the recording period: 30 seconds, 3 minutes, or 5 minutes.
The following three reports are generated automatically:
simple report for an unskilled user or typically for a patient under examination; this report displays integrated examination data only;
general report for a general practitioner, paramedical personnel, trainer; this report displays basic quantitative data of examination, norms, graphics, and conclusions;
expert report for medical specialists; this report contains maximum of quantitative and graphical data; it may be used for surveying HeartVUE 30-second data dynamics, for viewing ECG records, for editing R-R intervals, and for entering expert’s decision.
HeartVUE selects the 30 sec periods from ECG record. Low-amplitude oscillations of ECG signal in sequential heartbeat – i.e. so-called microalternations - are automatically analysed regarding every period. This method is principally different from that of standard ECG waveform analyzing. Microalternations are sensitive indicators of cumulative physiological body system effects involved in cardiac regulation mechanisms. HeartVUE responds to any myocyte ionic balance variations, sympathoadrenal system activation shifts and other metabolic changes that fail to be demonstrated by the ECG morphology or ultrasonic examination data due to rather minor values. Similarly, HeartVUE responds to the latent dynamic of a left ventricle compensatory reaction.
Microalteration characteristics are represented by integral index Myocardium and by 9 indices applicable for detailed variations occurred at heart chambers and for specifying depolarization and repolarization intervals. Thus, an average microalteration amplitude chart is formed producing a 3D cardiac color model (a disperse heart portrait).
When Myocardium index is specified within the range of 0-14%, it is rated as normal; in the range of 15-18% it achieves the borderline state; and when it jumps up to 19% and over, it is deviation.
Heart rate variability (HRV) analysis is a standard science-based prenosological diagnostic method applied for gaining the data of the regulatory system straining, as nonspecific response of an organism to any unfavorable effects to be invoked for mobilization of functional reserves.
With the HRV method applied to a 3- or 5-minute ECG record, time and frequency parameters are estimated and functional state of a body is classified in terms of homeostasis and adaptation considerations under calculation of Regulatory System Activity Index (RSAI):
Physiological norm (RSAI 1...3)
Satisfactory adaptation occurs under action of environmental factors. Sufficient body functional performance is exhibited. The regulatory system gains minimum strain to maintain homeostasis.
Prenosological state (RSAI 4...5)
For maintaining the balance between both the organism and environment, specific functional resources have to be mobilized with regulatory systems being strained. Homeostasis is maintained under regulatory system staining.
Premorbid state (RSAI 6...7)
Unsatisfactory adaptation occurs under action of environmental factors. Functional body performance is not sufficient but reduced. Homeostasis is survived thanks to significant strain of regulatory systems or under action of particular compensatory mechanisms involved.
Failure of adaptation mechanisms (RSAI 8...10)
Violent decrease of functional body performance is exhibited. Homeostasis is disturbed. Specific pathological changes are developed at organism and system level.
PC-ECG USB amplifier KARDi2/4, ZDEX-HV-HRV software, ECG electrodes (4 clamps), documentations.