[A method and device for telephone ECG autotransmission].
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Electrocardiography↗
Biomedical subjects
V M Koltun
Publications and source records attributed to V M Koltun.
[A portable device for checking equipment and programs of detecting flutter and fibrillation of heart ventricles in humans].
Facilities and programs of detecting ventricular flutter and ventricular fibrillation of the heart of man are important units of cardiomonitors. The life of cardiological patients staying at the departments for intensive care depend in many respects on the quality of the units in question. Using a portable simulator of three types of ventricular fibrillation and ventricular flutter it is possible to check up the service-ability and safety of the given units. The main parameters of the simulator are chosen on the basis of the statistical and spectral characteristics of real ventricular fibrillation and ventricular flutter, derived by the authors as a result of the experimental studies. Those characteristics can also be used for optimizing facilities and programs of detecting ventricular fibrillation and ventricular flutter.
Arrhythmias, Cardiac↗
[Interference-free automatic cardiac leads for health-related running].
An autocardioleader of the PKC-2 design intended for the control of the health running speed according to the heart rate is depicted. The device is characterized by a high interference-killing feature dependent on the R wave selector. The selector is fitted out with a band-pass filter, automatic gain control, and a shaper for standard impulse formation. The parameters of the band-pass filter have been optimized with the aid of the theory of optimum filtration for average spectral models of the signal (R wave) and jamming.
Electrocardiography, Ambulatory↗
[Selector of R wave of electro-cardiosignals with increase of the amplitude by the slope].
The given selector of R waves selects a signal from a combination of electrocardiosignals and jamming on the basis of computing the product of the amplitude of positive overshoots by the slope of their posterior fronts and comparison of the magnitude derived with an automatically changing threshold. The selector is comparatively unsophisticated in use, is highly jamproof and has a good speed of response. It is desirable that it may be used in cardiological devices working in conditions of motor activity of man.
Algorithms↗
[A portable device for measuring the characteristics of electrocardiographs].
Specialised portable ECG tester can considerably reduce labour-consuming and time needed for measurements of electrocardiographic parameters. This type of the unit is useful especially for engineers involved in repairs of medical instruments. ECG tester consists of test signals generators and ECG imitator. ECG is formed with the filters, their calculation methods are stated herein.
Electrocardiography↗
[Transmitters for autotranslation of electrocardiographic signals via telephone communication channels].
Each of the three described transmitters for ECG signals autotransmitting via telephone lines has its own design peculiarities and its own ways of application. Serial production and wide use of the transmitters will considerably improve medical service for cardiologic patients.
Electrocardiography↗
[Optimal parameters of the system of telemetric frequency-modulated electrocardiographic signals].
Most of manufactured ECG signals telephone transmitting systems with frequency modulation have not optimal parameters, reducing the noise immunity and resulting in signal distortion with large damping in telephone lines. The theoretical and experimental analysis permits the optimization of the modulation index of the translator and the band-pass of the receiver and is realized through the recommendations to constructors.
Electrocardiography↗
[Selector of R waves in electrocardiosignals, distinguishing signals by geometric characteristics].
The informative reliability of automated ECG analyzers operating under dynamic conditions is mainly dependent upon the noise immunity of R-wave selectors. The selector is developed that selects sequentially input positive spikes, at first, for the rate of negative slope and, then, for its duration thus providing much greater noise immunity as compared to commonly used models with built-in band-pass or resonant filters. So, the errors of detecting events for one of the test-signals for above selectors are 1,8%, 22% and 17%, respectively.
Electrocardiography↗
[R-wave selector recognizing signals by geometric characteristics].
Many up-to-date cardiologic units show poor information reliability when the subject moves. The noise immunity of the units can be considerably improved by means of the R-wave selector that discriminates signals by rate and duration of the pulse decay (RS-slope). Two versions of the circuitry for such units are possible, parallel and series. The noise immunity of both versions is similar, but the series one may be easier realized. The optimum threshold values for this selector are as follows: 12 ms in the rate and 14 ms in the duration.
Electrocardiography↗
[A 4-channel miniature radiotelemetric system for transmission of cerebral biopotentials].
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Animals↗
[Unit for measuring the interference stability of information element selectors for electrocardiac signals].
The device provides automatic measuring noise immunity of selectors for informative ECG elements. Errors in signal detecting by a reference selector are mainly responsible for a measurement error of noise immunity. The expression to derive a relative instrumental error has been deduced.
Electrocardiography↗
[Optimal parameters of an adaptive temporal selector of informative elements of the electrocardiosignals].
The adaptive temporal selector increases 2-3 times the noise immunity of detectors of ECG informative elements, especially of R = R-wave detectors, that is of particular importance when patient moves. The selector produces the protective time interval the duration of which is conditioned by the duration of the preceeding R = R-interval, so the probability of false detections caused by noise is reduced. The optimum protective time interval should constitute 84 per cent of the preceeding R = R-interval, the error should not exceed +/- 5%.
Arrhythmias, Cardiac↗
[Adaptive time selector for the information elements of electrocardiographic signals].
The functional diagram of the adaptive time selector is described, and some experimental results are given. With the device, a considerable increase in noise immunity of instruments to measure and control ECG informative signs becomes possible when recording ECG under conditions of the patient motor activity.
Electricity↗
[Choice of the criterion and method of measuring the interference stability of the information element gates of electrocardiac signals].
The relative error of detecting ECG informative elements at the optimum threshold is suitable to consider as a quantitative criterion for noise-immunity of selectors of ECG informative elements. So, the method of measuring the noise-immunity of binary detectors using the portions of real ECG's and noise tracings as test signals should be used to measure the criterion.
Electrocardiography↗