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VNS-Micro
vegetotester - digital instrument for vegetative
nervous system study
 PDF-file
(zip-archive 1,04 Mb)
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USB connection |
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ISO 9001 quality certificate |
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General
Properties •
Techniques
• Delivery
Set •
Specifications
VNS-Micro
General Properties
The last two decades have witnessed the recognition of a
significant relationship between the autonomic nervous system
and cardiovascular mortality, including sudden cardiac death.
Experimental evidence for an association between propensity for
lethal arrhythmias and signs of either increased sympathetic or
reduced vagal activity has spurred efforts for the development
of quantitative markers of autonomic activity. HRV represents
one of the most promising markers.
In 1996 the European Society of Cardiology and the North
American Society of Pacing and Electrophysiology constituted a
Task Force, which developed and published "Heart Rate
Variability Standards of Measurement, Physiological
Interpretation, and Clinical Use".
In 1999 the new method which perfectly supplements the standard
HRV analysis was developed by our company R&D department. The
method allows to conduct simultaneous heart and breath rate
examination and to assess their cross correlation.
There are three HRV measurement approaches: time-domain analysis,
frequency-domain analysis and responses to standardized stimuli
– cardiovascular reflex tests (Standard Battery of Tests
according to D.Ewing).
Simple noninvasive cardiovascular reflex tests have now become
the gold standard by which an autonomic neuropathy is diagnosed
objectively, and by which other tests are judged. Their use was
pioneered in the assessment of diabetes, but they are being used
increasingly in a number of other conditions in which autonomic
damage is suspected.
A perfect implementation of the described methods is
VNS-Micro
vegetotester. Nowadays many neurophysiologists and medical
specialists all over the world successfully use this software
and equipment in their daily clinical work. You can also get
such a splendid opportunity.
VNS-Micro
Techniques
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Patient N., 32 years
Electrocardiogram with QRS markers and calculated R-R
intervals; pneumogram with markers at the start of each
breath cycle and calculated "breath-breath" intervals. |
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Patient N., 32 years
Rhythmogram is a graphic chart that shows the dependence
of R-R interval duration on time. Rhythmogram
oscillations are the result of the regulation systems
influence on heart (HRV in particular). The green
diagram is the breath rhythmogram. Its changes are
determined by work of breath rate regulation systems. |
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Patient N., 32 years
Spectrogram is a graphic chart that shows the dependence
of rhythmogram oscillations amplitude on their frequency.
Frequency ranges are differently colored: the dark blue
area is proportional to the parasympathetic regulation
power; the red area is proportional to the sympathetic
regulation power. |
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Patient N., 32 years
Orthostatic test rhythmogram. The wave appearing in the
first 30 sec is the vagus reaction. |
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Patient N., 32 years
Orthostatic test spectrogram. Here one may clearly
observe sympathetic response – the red area increase. |
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Patient N., 32 years
Checkup report of the HRV analysis by orthostatic test
results. |
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Patient S., 42 years
Rhythmogram of deep breath testing. The heart rate
modulation by breath is clearly seen. The leading role
in this process belongs to the vagus. |
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Patient S., 42 years
Valsalva maneuver rhythmogram. |
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Patient S., 42 years
Interpretation of the cardiovascular reflex tests
results. |
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VNS-Micro
Delivery Set
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Miniature electronic unit
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Patient cable
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Reusable limb clamp ECG electrode – 4 pcs.
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Breath sensor – 2 pcs.
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Set of equipment for cardiovascular reflex tests:
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Tonometer
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Handgrip dynamometer
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Manometer with the attachment for Valsalva maneuver
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Mouthpiece – 20 pcs.
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Electrode gel
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CD with software
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User and technical manuals
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Transportation bag |
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VNS-Micro
Specifications
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Number of breath channels |
1 |
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Number of ECG channels |
2 |
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Number of ECG leads |
6 (I, II, II, aVR, aVL, aVF) |
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Sampling rate |
2000 Hz |
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A/D converter |
12 bit |
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Frequency response |
0.05 – 250 Hz |
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Low pass filter |
35 (myogram), 75 Hz |
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High pass filter |
0.05 Hz (3.2 s) |
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Input noise level, not more than |
20 µV |
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Input range |
0.03 – 5 mV |
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Sensitivity |
2.5, 5, 10, 20, 40 mm/mV |
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Paper speed |
5, 10, 25, 50, 75, 100, 200 mm/s |
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AC filter |
50 (60) Hz |
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Defibrillation protection |
Yes |
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Control of electrode setting |
Yes |
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Input impedance, not less than |
50 MΩ |
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Common-mode rejection ratio, not less than |
100 dB |
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Supply Voltage: |
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Electronic unit |
5 V from PC |
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Desktop PC-based system |
220/230 V AC (50 Hz) / 110 V AC (60 Hz) |
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Notebook PC-based system |
220/230 V AC (50 Hz) / 110 V AC (60 Hz) / Int.
battery |
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Electronic unit power consumption, not more than |
0.3 VA |
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Dimensions: |
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Electronic unit, not more than |
150x70x25 mm |
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Delivery set, not more than |
450x350x160mm |
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Weight: |
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Electronic unit with cable, not more than |
0.4 kg |
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Delivery set (without computer and printer), not
more than |
4.5 kg |
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Interface |
USB |
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Safety |
BF typ |
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