Device for continuous monitoring of the heart activity

 

The invention relates to the field of medical equipment, namely to design devices for the transfer of electrocardiogram radio, and can be used in practical health care, including in the system of the ambulance, in the system of distance counselling centres. The device includes electrodes, pre-amplifier, a microprocessor, memory blocks of the lower and upper levels, the first block of comparison, the first threshold unit, the processing unit alarm, magnetic recorder, the unit audible alarm generator high frequency, the amplitude modulator, the baseband generator code phase manipulator, power amplifier, transmitting antenna, receiving antenna, the unit realignment, local oscillator, mixer, intermediate frequency amplifier, a detector, a first delay line, the first key, the amplitude limiter, a synchronous detector, a second delay line, a phase detector, the first measuring the width of the spectrum, the doubler phase, the second meter width of the spectrum, the second block comparison, the second threshold unit, the first amplitude detector, a frequency detector, a differentiating unit, the first unidirectional valve circuit And the second key, the second ampli is key. The invention provides increased robustness and selectivity panoramic receiver device by suppressing spurious signals (noise) taken on additional channels. 6 silt.

The proposed device relates to the field of medical equipment, namely to design devices for the transfer of electrocardiogram radio, and can be used in practical health care, including in the system of the ambulance, in the system of distance counselling centres.

Known devices for continuous monitoring heart activity and for diagnosing diseases of the heart (ed. mon. The USSR№№776604, 1301376, 1311706, 1364298, 1377030, 1389751, 1409221, 1421303, 1535529, 1540800, 1641272, 1671264, 1725828, 1797856, 1811380, 1814538; patents of the Russian Federation№№2012225, 2012226, 2026636, 2028077, 2077864, 2080820, 2106798, 2108061, 2128004, 2181258; U.S. patents№№3616790, 4022192, 4231374, 5002064; the heart monitor. Apparatus for continuous ECG monitoring. Ed. Baranovsky A. L. et al. Radio and communication, 1993 and others).

Known devices closest to the proposed is a Device for continuous monitoring of the heart activity (patent RF №2181258, And 61 In 5/04, 2000), which is selected as the second blocks of the comparison, the memory blocks of the lower and upper levels, first adjustable threshold unit, the processing unit alarm, magnetic recorder, the unit audible alarm generator high frequency, the amplitude modulator, the baseband generator code phase manipulator, power amplifier, transmitting antenna, receiving antenna, the unit realignment, local oscillator, mixer, intermediate frequency amplifier, a detector, first and second delay lines, key, amplitude limiter, a synchronous detector, a phase detector, a microprocessor, a processing unit alarm, magnetic recorder and block signaling system. The known device can increase the reliability of remote monitoring heart activity of the observed person.

However, in a panoramic receiver of the known device is the same value intermediate frequency Wnpcan be obtained as a result of receiving signals on two frequencies W1and W3, i.e.,

Wnp=Wg-W1and Wnp=W3-Wg.

Therefore, if the frequency W1to take over the main channel, along with it will be a mirror of the receive channel frequency W3which often differs from the education on the image receiving channel occurs with the same conversion coefficient KCRthat and the main channel. Therefore, it is most significantly affect the selectivity and robustness panoramic receiver that is part of the known device.

In addition to the mirror, there are other additional (Raman) receiving channels. In General, any fluid channel reception occurs when the condition

Wnp=/±mWki±nW/,

where Wki - frequency Raman receiving channel;

m, n positive integers.

The most harmful combination receiving channels are channels formed by the interaction of the carrier frequency signal with harmonics of the lo frequency of small order (second, third, and so on), because the sensitivity of the panoramic receiver through these channels close to the sensitivity of the main channel.

So, two Raman channel when m=1 and n=2 correspond to the frequencies (Fig.3):

Wk1=2Wg-Wnp, Wk2=2Wg+Wnp.

The presence of false signals (interference), taken in the mirror and Raman channels, leads to decreased immunity and selectivity panoramic receiver.

An object of the invention is the increased robustness and selectivity panoramic pickup is certain the task is solved by the device for continuous monitoring of the heart activity, containing series-connected electrodes, pre-amplifier, an amplitude modulator, a second input connected to the output of the high-frequency generator, a phase manipulator, a second input connected to the output of the generator modulating code, the power amplifier and transmitting antenna series the receiving antenna, the mixer, the second input is through a local oscillator coupled to the output block adjustment, the control input of which is connected to the output of the detector, and the intermediate frequency amplifier, cascaded detector, the second input is through the first delay line is connected with its output, the first key, the amplitude limiter, a synchronous detector, a second input connected to the output of the first key, the microprocessor and block the formation of an alarm signal, the first and second outputs of which are connected respectively to the unit and audible alarm magnetic recorder, the output of the amplitude limiter connected in series, the second delay line and a phase detector, a second input connected to the output of the amplitude limiter, and the output is connected to atomicreference made in the form of the first unit of comparison, memory blocks of the lower and upper levels and an adjustable first threshold unit whose output is the output of the microprocessor, the input of which is the input of the first unit of comparison, which are connected respectively to the memory blocks of the lower and upper levels and to the first threshold unit, equipped with two amplitude detectors, frequency detector, a differentiating unit, two unipolar valves, circuit And the amplifier, the third block of comparison, second, third and fourth keys, and to the output of the intermediate frequency amplifier connected in series frequency detector, a differentiating unit, the first unidirectional valve, the scheme And, a second entrance through which the first amplitude detector connected to the amplifier output intermediate frequency, the second key, a second input connected to the output of the first amplitude detector, the third key and a fourth key, a second input connected to the output of intermediate frequency amplifier, and the output connected to the first input detector and the first key, the output of the receiving antenna are connected in series to the second amplitude detector, the amplifier, the third block of comparison, a second input connected to the output of the first is A.

Structural diagram of the device shown in Fig.1. Block diagram of the detector shown in Fig.2. Frequency chart explaining the process of formation of additional receiving channels is shown in Fig.3. Timing diagrams explaining the principle of operation of the device shown in Fig.4

The device comprises a series-connected electrodes 1, a preamplifier 2, the amplitude modulator 12, a second input connected to the output of the generator 11 high frequency, phase arm 14, a second input connected to the output of the generator 13 modulating code, power 15 power and transmitting antenna 16, consistently included receiving antenna 17, the mixer 20, the second input is through the local oscillator 19 is connected to the output of block 18 of perestroika, the control input of which is connected to the output of the detector 22, the amplifier 21 intermediate frequency, the frequency detector 35, a differentiating unit 36, the first unipolar valve 37, scheme And 38, the second input is through the first amplitude detector 34 is connected to the output of the amplifier 21 of the intermediate frequency, the second key 39, a second input connected to the output of the first amplitude detector 34, the third key 44, the fourth key 45, the second is via the first delay line 23 is connected with its output, the first key 24, a second input connected to the output of the fourth key 45, the amplitude limiter 25, synchronous detector 26, a second input connected to the output of the first key 24, the microprocessor 3 and the block 8 of the formation of an alarm signal, the first and second outputs of which are connected to the magnetic recorder 9 and block 10 audible alarm, sequentially connected to the output of the amplitude limiter 25 second delay line 27 and a phase detector 28, a second input connected to the output of the amplitude limiter 25, and the output connected to the second input magnetic Registrar 9, a third input connected to the output of a synchronous detector 26, connected in series to the output of the receiving antenna 17 of the second amplitude detector 40, the amplifier 41, the third comparison unit 42, a second input connected to the output of the first amplitude detector 34, and the second unipolar gate 43, the output of which is connected to a second input of the third key 44.

Thus, the microprocessor 3 is made in the form of the first block 5 comparison of memory blocks of the bottom 4 and top 6 levels, and an adjustable first threshold unit 7, the output of which is the output of the microprocessor 3, the entrance of which is input the first blogowogo block 7.

The detector 22 is made in the form of cascaded doubler 30 phase meter 31 spectrum width of the second harmonic, the second unit 32 of the comparison, a second input connected to the output of the meter 29 spectrum width, and the second threshold unit 33, a control input connected to the output of the first delay line 23, and the output is the output of the detector 22, and the input of the doubler 30 phase meter 29 spectrum width of the signal are combined and the input of the detector 22.

As block 18 adjustment is used, as a rule, the sawtooth generator.

Device for continuous monitoring of the heart activity is as follows.

The electrodes 1 are attached to the monitored person (athlete, driver, desktop, patients with various cardiovascular disorders and diseases, etc.,) in the field of removal of ECG, which largely depends on the quality of the shooting electrocardiogram. While there is interference due to physiological reasons (artifacts), and interference associated with methodical moments.

Interference caused by physiological reasons, depend on the potentials of skeletal muscles and are generally considered panisonic interference electrodes 1 must be connected in a bipolar chest leads. It is declared that in the chest, the amplitude of the ECG is the most important, and the pectoral muscles are not actively participating in the movement process. Among the two pole chest leads is advisable to use lead Sky in which three electrodes are as follows.

The first electrode is located right at the point of insertion of the third rib to the breastbone. The second level of the fifth rib on the left srednerusskoi line. The third electrode is at the level of the fourth rib in the mid-axillary line on the left. The system includes Sky lead:

And between the first and second electrodes;

D - between the first and third electrodes;

I - between the second and third electrodes.

The advantage of these leads is that they to a certain extent reflect the potentials of the lateral and posterior walls of the heart.

Interference of the second group associated with methodical moments, basically more substantial and control plays a major role. These include interference of two kinds:

a) noise from the bias electrodes when the jolts and shocks that inevitably arise in dynamic conditions;

b) electrical noise and distortion, with sometimes quite complicated.

The displacement of the electrodes will wait the electrodes and the skin. Interference of an electrical nature are diverse, and almost all of them Express the greater, the more the resistance value of the transitional contact between the electrodes and the skin.

To combat methodological noise and distortion must

a) to stabilize the value of contact resistance;

b) to do this magnitude is not only constant, but possibly less.

The first is achieved either by the use of Cup electrodes, filled pasta and attached to the skin by leolam and additionally ribbons of adhesive tape, or the use of liquid electrodes-suckers. The latter provide greater reliability due to the fact that the attachment is combined method (bonding glue and suction), and furthermore, a liquid electrolyte is an absolute homogeneous contact medium, whose properties are not significantly changed by the intense sweating investigated.

The second is the reduction of contact resistance is achieved by a complex process Vodolazskiy P. A. because of the high electrical resistance of the skin is due to the properties as of the stratum corneum of the epidermis by wiping abrasive paste (soap cream with it PEMs is 1:1).

Recorded by electrodes 1 cardioseal m(t) (Fig.4, a), passing through the pre-amplifier 2, is fed to the first input of the amplitude modulator 12, the second input of which is applied a high-frequency oscillation output from the generator 11 high frequency (Fig.4, b)

U1(t)=V1×Cos(W1×t+1), 0tT1,

where V1, W1,1, T1- amplitude, carrier frequency, initial phase, and the duration of harmonic oscillations.

The output of the amplitude modulator 12 produces a signal with amplitude modulation (AM) (Fig.4,)

U2(t)=V2×[1+m(t]× Cos(W1×t+1), 0tT1,

where V2=1/2K1×V1;

To1- the ratio of the amplitude modulator;

m(t) - law amplitude modulation.

AM signal U2(t) arrives at the first input of the phase manipulator 14, to the second input of which receives the modulating code M(t) (Fig.4, g), where the digital code contains brief information about the nab signal from the combined amplitude modulation and phase shift keying (AM-FMN) (Fig.4, d)

U3(t)=V3×[1+m(t]× Cos(W1×t+k(t)+1), 0tT1,

where V3=1/2K2×V2;

K2- the ratio of the amplitude modulator;

k(t)={0,} - manipulated component phases, reflecting the law of phase manipulation in accordance with the modulating code M(t) (Fig.4, g) withk(t)=const For Ke<t>(K+1)e and may change abruptly at t=Touh, i.e., at the boundaries between elementary parcels (K=0, 1, 2,... , N-1);

uh, N - the length and number of basic assumptions which form the signal duration T1(T1=Ne).

This signal, after amplification in the amplifier 15 of the power radiated by the transmitting antenna 16 in the air, the admission antenna 17 and is supplied to the first input of the mixer 20, the second input of which is applied the voltage of the local oscillator 19 linearly changing frequency is g>t2+g), 0tTp,

where Vg, Wg,gTp- amplitude, initial frequency, initial phase, and the repetition period;

=Df/TP - rate of change of the frequency of the local oscillators in a given frequency range Df.

At the output of mixer 20 are formed voltage Raman frequencies. Amplifier 21 intermediate frequency is allocated voltage differential (intermediate) frequency:

Unp1(t)=V4[1+m(t)]Cos[Wnpt-K(t)+t2+np], 0tT1,

where V4=1/2K3×V3×Vg;

K3- gain mixers;

Wnp=Wg-W1- intermediate frequency;

np2=g-1.

This voltage is a complex signal with a combination of amplitude modulation, phase medialine by changing the frequency of the local oscillator 19. The frequency of the received signal (Fig.5, a) is changed according to the law of linearly increasing saws (Fig.5, b). The specified signal is simultaneously fed to the input of the amplitude detector 34 and the frequency detector 35.

Amplitude detector selects the signal envelope Vad (Fig.5), which is fed to the input circuit And 38 key 39. In the initial state, the keys 24, 39, 44 and 45 are always closed. From the output of the frequency detector 35, the video signal (Fig.5, g), the shape of which corresponds to the law of variation of the frequency converted signal (Fig.5, b), is fed to the input of the differentiating unit 36, an output pulse which V (Fig.5, d) through a unipolar gate 37 is supplied to the second input circuit And 38. Unipolar valves 37 and 43 pass only positive pulses. Since the voltage output of the amplitude detector 34 (Fig.5, b) and unipolar valve 37 (Fig.5, d) take on the time axis the same interval, the circuit 38 is triggered and its output pulse V (Fig.5, e) opens the key 39.

The received signal output from the receiving antenna 17 is simultaneously fed to the input of the detector of the receiver, consisting of the amplitude detector 40 and amplifier 41.

If the total gain of the detector receiver chosen in such a way that the resultant channels and more at the reception on the Raman channels, the output of the comparison unit 42 in the first case forming a positive voltage and the second negative voltage, which is not passed unipolar valve 43. A positive voltage from the output of the comparison unit 42 through a unipolar gate 43 is supplied to the control input of the key 44 and opens it. This positive pulse (Fig.5, C) (from the output of block 38 comparison) through the public keys 39 and 44 is supplied to the control input of the key 45, opening it.

Voltage Unp1(t) from the output of the amplifier 21 intermediate frequency via a public key 45 to the input of the detector 22, consisting of the first 29 and second 31 measures the width of the spectrum of the doubler 30 phase and threshold unit 33. At the output of the doubler 30 phase voltage is formed

U4(t)=V4[1+m(t)]Cos[Wnpt+2t2+2np], 0tT1,

in which phase shift keying already present.

The spectral widthf2the second harmonic signal is determined by the duration of T1signal

f2=1/T1,

that is usinguh its basic packages

fc=1/uh,

i.e., the spectral widthf2the second harmonic signal is N times smaller than the width of the spectrum of the input signal

FC/f2=N.

Therefore, by multiplying the phase of the AM-FMN-chirp signal on two of its range “collapsed” N times. This circumstance allows to detect the input signal even when its power at the input of the device is less than the noise power and interference.

The spectral widthFC of the input signal is measured using a meter 29 and the width of the spectrumf2the second harmonic signal is measured using a meter 31. Voltage Vc and V2proportional toFC andf2accordingly, outputs of the probes 29 and 31 of the spectrum width is fed to two input block 32 comparison. As Vc>>V2then the output of block 32 comparison produces a positive pulse which is compared with the threshold voltage Vnop threshold in block 33. Threshold voltage Vnop exceeded only PR is the voltage which is supplied to the control input unit 18 realignment, turning it in the stop mode, the input of delay line 23 and to the control input key 24, opening it.

From this point in time view of the specified frequency range Df and search for AM-QPSK signals terminated at the time of registration of the detected S-QPSK signal, which is determined by the delay time1delay line 23.

At the termination of the restructuring of the local oscillator 19 steering 21 intermediate frequency is allocated voltage

Unp(t)=V4×[1+m(t)]× Cos[Wnpt-k(t)+np], 0tT1,

which through public key 24 is fed to the input of the amplitude limiter 25 and the synchronous detector 26. The output of the amplitude limiter 25 is formed QPSK signal (Fig.4, e)

U5(t)=V0×Cos[Wnpt-K(t)+np], 0tT1,

where V0the threshold limit, which is supplied to the second input of the synchronous detector 26 and to the input line sabrepulse low voltage (Fig.4, W)

UH1(t)=VH1×[1+m(t)],

where VH1=1/2K4V4V6;

K4- the transfer rate synchronous detector,

proportional to the source cardiomegaly m(t). This voltage is fed to the input of block 5 comparison of the microprocessor 3, which compares the recorded signal of a specific patient's defined normal human upper and lower permissible levels received at block 5 comparison with blocks 4 and 6 memory upper and lower levels. When the deviation of the recorded signal for the maximum permissible torque is triggered adjustable threshold unit 7, including the block 10 and audible alarm magnetic recorder 9. Last writes for 5-10 seconds and registration of pathological process on the portable cartridge. The device is powered by a normative power source (not shown).

The delay line 27 and a phase detector 28 provides detection of QPSK signal U5(t) (Fig.4, e) by the method of relative phase manipulation, which is free from the phenomenon of “reverse”.

When this delay timeç2the delay line 27 is selected, R is b>=e) (Fig.4, C). In this case, the reference voltage for each subsequent elementary parcel is previous basic premise. The output of the delay line 27 is formed voltage (Fig.4, C)

U6(t)=U5(t-2)=V6×Cos[Wnp(t-2)-K(t-2)+np], 0tT1,

which comes to the second input of phase detector 28. The output of the last formed of the low-frequency voltage (Fig.4,)

UH2(t)=VH2×CosK(t)

where VH2=1/2K5V26;

To5- gain of the phase detector,

proportional to the modulating code M(t) (Fig.4, g). This voltage is fixed magnetic Registrar 9.

Thus, the magnetic recorder 9 provides registration information about the patient and his pathological data on the cardiovascular system.

Latency1delay line 23 is selected such that the e on the magnetic tape. After this time, the voltage output from the delay line 23 is fed to the reset input of the detector 22 (threshold block 33) and resets its contents to zero. The block 18 of the adjustment mode adjustment, and the switch 24 is closed, i.e. they must be in their original condition. From this point in time view of the specified frequency range Df and search for AM-QPSK signals continues.

In case of detection of the next S-QPSK-signal operation of the device is similar.

Described above, the operation of the device corresponds to the case of receiving useful S-QPSK signals in the main channel at the frequency W1(Fig.3,5).

If you receive a false signal (interference) on the image channel at the frequency WCscheme And 38 does not work and the key 39 remains closed. This is because the amplifier 21 intermediate frequency stands out voltage (Fig.6, a), the frequency of which varies linearly with incident law (Fig.6, b). From the output of the frequency detector 35 video VBH(Fig.6, g), the derivative of which has a negative sign (Fig.6, e), does not pass through the single valve 37, scheme And 38 does not work, the key 39 is opened, and a false signal (interferer) the ex), accepted by Raman channels, use the detector receiver, consisting of the amplitude detector 40 and amplifier 41. Suppression of spurious signals (noise) that is accepted by Raman channels, based on the fact that the total gain superheterodyne panoramic receiver when receiving false signals (noise) in the Raman channels is always less than the gain at the reception on the primary and mirror channels due to additional losses in the mixer in Raman conversion.

If the total gain of the detector of the receiver to choose so that it had less gain superheterodyne panoramic receiver when receiving signals on the primary and mirror TV and more at the reception on the Raman channels at the output of the comparison unit 42 in the first case forming a positive voltage and the second negative voltage, which is not passed unipolar valve 43. The key 44 is not opened, and false signals (interference), adopted by Raman channels are suppressed.

The device may be implemented in various modifications, intended for patients with various cardiovascular disorders, Soboleva heart disease), enter the reference information to the microprocessor, which will be the comparison of the recorded signals. For example, a patient with a predisposition to proximale tachycardia will be monitored cardiac cycles, in the case of arrythmia - periodicity, the number and shape of extrasystoles, myocardial ischemia, a programming device is configured to compare the amplitude, direction and duration of waves and intervals of the ECG.

The device provides remote obtain objective information about the condition of the heart in real conditions of social and industrial life, provides personalized remote monitoring of heart activity in a specific patient, promptly can notify the occurrence of an early objective signs of acute cardiac disorders and, therefore, improves the efficiency of therapeutic and rehabilitative activities. This remote control is carried out simultaneously with the heart activity of several patients, which use radio signals of different frequencies and modulation codes, which transmit in addition to kardiosignalas still and patient information. The device can be used in the sports medicine, aerospace flight for diagnosis and prevention of disorders and abnormalities of cardiac activity among truck drivers.

Thus, the proposed device is compared with the prototype and other technical solutions for a similar purpose provides increased robustness and selectivity panoramic receiver device. This is achieved by the suppression of spurious signals (noise) received by the mirror and Raman channels. In this case, to suppress spurious signals (noise) taken by the image channel, uses the character of change of the frequency converted signal. To suppress false signals (interference), adopted by Raman channels, is based on a comparison of the gain of the detector and panoramic superheterodyne receivers.

Claims

Device for continuous monitoring of the heart activity, containing series-connected electrodes, pre-amplifier, an amplitude modulator, a second input connected to the output of the high-frequency generator, a phase manipulator, a second input connected to the output of the generator modulating code and intensify the th through the local oscillator coupled to the output block adjustment, the control input of which is connected to the output of the detector and the intermediate frequency amplifier, the second input of the detector through the first delay line is connected with its output and sequentially connected to the first key, the amplitude limiter, a synchronous detector, a second input connected to the output of the first key, the microprocessor and block the formation of an alarm signal, the first and second outputs of which are connected respectively to the unit and audible alarm magnetic recorder, the output of the amplitude limiter connected in series, the second delay line and a phase detector, a second input connected to the output of the amplitude limiter, and the output connected to the second input magnetic Registrar a third input connected to the output of a synchronous detector, the microprocessor is made in the form of the first unit of comparison, the memory blocks of the lower and upper levels and an adjustable first threshold unit whose output is the output of the microprocessor, the input of which is the input of the first unit of comparison, which are connected respectively to the memory blocks of the lower and upper levels, and a threshold unit, characterized in that it has two amplitudemodulated, the third block of comparison, second, third and fourth keys, and to the output of the intermediate frequency amplifier connected in series frequency detector, a differentiating unit, the first unidirectional valve circuit And a second inlet through which the first amplitude detector connected to the amplifier output intermediate frequency, the second key, a second input connected to the output of the first amplitude detector, the third key and a fourth key, a second input connected to the output of intermediate frequency amplifier, and the output connected to the first input detector and the first key, the output of the receiving antenna are connected in series to the second amplitude detector, amplifier, the third block of comparison, a second input connected to the output of the first amplitude detector, and the second unidirectional valve, the output of which is connected to a second input of the third key.



 

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2 ex, 1 tbl

FIELD: medicine; medical engineering.

SUBSTANCE: method involves doing multi-channel recording of electroencephalogram and carrying out functional tests. Recording and storing rheoencephalograms is carried out additionally with multi-channel recording of electroencephalogram synchronously and in real time mode in carotid and vertebral arteries. Electroencephalograms and rheoencephalograms are visualized in single window with single time axis. Functional brain state is evaluated from synchronous changes of electroencephalograms, rheoencephalograms and electrocardiograms in response to functional test. The device has electrode unit 1 for recording bioelectric brain activity signals, electrode unit 2 for recording electric cardiac activity signals, current and potential electrode unit 3 for recording rheosignals, leads commutator 4, current rheosignal oscillator 5, synchronous rheosignal detector 6, multi-channel bioelectric brain activity signals amplifier 7, electrophysiological signal amplifier 8, demultiplexer 9, multi-channel rheosignal amplifier 10, multi-channel analog-to-digital converter 11, micro-computer 12 having galvanically isolated input/output port and personal computer 13 of standard configuration.

EFFECT: enhanced effectiveness of differential diagnosis-making.

11 cl, 6 dwg

FIELD: medicine, pulmonology.

SUBSTANCE: in patients with chronic bronchitis one should detect the level of central frequency of diaphragmatic spectrum due to myography at attempt of inhalation in case of overlapping respiratory tract at the level of residual volume (CFRVD) in Hz. Simultaneously, one should detect maximal oral inspiratory pressure (Oip)in kPa. Due to mathematical formula including altered parameters it is necessary to calculate criterial D value to diagnose hyperreactivity of respiratory tract.

EFFECT: higher efficiency of diagnostics.

2 ex

FIELD: poultry science.

SUBSTANCE: the present innovation deals with visual evaluation in chicken followed by testing them by the value of bioelectric potential. Chickens with bioelectric potential being significantly higher against average values are considered to be stress-resistant ones and those with bioelectric potential being significantly lower against average values in concrete population are concluded to be stress-sensitive ones. The method is very simple in its implementation and efficient for large-scale selection in poultry on stress-resistance.

EFFECT: higher efficiency.

1 cl, 2 dwg, 2 ex, 4 tbl

FIELD: medicine, functional diagnostics.

SUBSTANCE: one should apply active electrodes in frontal (Fz), occipital (Cz), parietal (Td, Ts) areas, as for reference electrode it should be applied in area of right-hand wrist. Registration of constant potential level (CPL) should be performed under conditions of decreased impact of cutaneous resistance. Then the data obtained should be compared with pre-established normative ones for this age group. One should apply mean values and root-mean-square (rms) deviations, moreover, if CPL value obtained is not beyond the limits of Fz = 15.95 ± 3.88 mV, Cz = 25.71 ± 4.56 mV, Oz = 25.92 ± 5.39 mV, Td = 24.18 ± 5.45 mV, Ts = 22.51 ± 6.06 mV, in this case CPL distribution shows normal cerebral energetic state.

EFFECT: higher accuracy of evaluation.

2 ex

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