Nerve - Monitor makes possible assessment of the Autonomic Nervous system in a "real - time" regime, which means that data is analyzed as it is put in. Results can thus be received with a defined periodicity (the period during which the data is renewed corresponds to the time of the "standard stage" which is 192 R-R intervals). 192 R-R intervals may last from 2 - 4 minutes, depending on the heart rate. Calculations, therefore, can be done every 2 to 4 minutes. Additional information, such as heart rate, tension index (TI) and analysis of the extrasystolic beats, can be obtained simultaneously with the autonomic tone analysis in every stage.
In spite of some simplicity of this regime, in essence it is universal since it gives the opportunity to assess the autonomic response during the different kinds of long-term therapy, long-term test like stress-test (please refer to Figures 12, 13, 14) or during any kind of experiment with a purpose to optimize the strategy of therapy, but the most important applications is "intensive care" and anesthesia. Also very interesting is the experiment to distinguish the allergic agents, as in the case of asthma. This list of practical use can be prolonged, but specialists of each clinic can find their own uses for the system.
Nerve Monitor was also set up to include the possibility of interrupting the input of data at the moment of the therapeutic intervention, using the 'Pause" option. For example, clicking on 'Pause" at the true of injection eliminates the unnecessary ANS response to pain and leaves only the ANS response to treatment. Figures 12-14 shows a sample of printout during stress test. Here the ANS reaction is typical in most of the cases. At the onset of exercise the Parasympathetic response decreases and the sympathetic response increases. With the increase of the workout the process becomes stronger. At the end of the exercise (recovery period) we can observe the recovery of the autonomic tone up to the initial level.
On Figure 12-14 you can see:
Stage 1 - rest;
Stage 2 - onset of the exercise (adaptation period);
Stage 3 …6 workout
Stage 7 first period of recovery (fast recovery)
Stage 8-12 second period of recovery (slow recovery)
The case on Figure 12-14 shows a lot of extrasystoles before and after the stress test. It's important to distinguish the recognition of it because a big number of the extrasystoles make impossible correct analysis of ANS state.
On Figure 12 are also included the results of calculation for each stage. Fig. 13 shows stage by stage separate response of the Sympathetic and Parasympathetic Tone of ANS
Figure 14 depicts the 3D spectral analysis for all stages.
By using PC - ECG device (fig. 6) during input R-R intervals we can see real ECG on a screen as shown on fig. 15. It is important to recognize type of extrasystoles, when it's happened. On Figure 16 has been recognized ventricular ectopic beat.
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