Method of predicting recovery of sinus rhythm in patients with paroxysmal atrial fibrillation
SUBSTANCE: invention relates to the field of medicine, in particular to cardiology, and can be used for determining success in recovering the sinus rhythm in patients with paroxysmal atrial fibrillation. A rhythmogram is registered and the following mathematical averaging by a "sliding window" method is realised. The coefficient of rhythm biochronological ordering is calculated by formula
EFFECT: method makes it possible to estimate the probability of recovering the sinus rhythm in patients with paroxysmal atrial fibrillation with high sensitivity and specificity.
The invention relates to medicine, in particular to cardiology, and can be used to measure the success of restoration of sinus rhythm in patients with paroxysmal form of atrial fibrillation.
Currently using a method such as correlation rithmography (KRG), the essence of which lies in the graphical display of the successive pairs of R-R (previous and next) in a two-dimensional coordinate plane, developed a number of domestic researchers [Berezny E. A. Correlation rithmography in the study and treatment of patients with atrial fibrillation. -Cardiology, 1981, No. 5, pp. 94-96].
A disadvantage of the existing method is the low specificity and sensitivity. At the same time, there is a need to assess the success of restoration of sinus rhythm.
The aim of the invention is to improve the accuracy of the assessment of sinus rhythm in patients with paroxysmal form of atrial fibrillation.
Currently the restoration of sinus rhythm can be performed by pharmacological cardioversion with antiarrhythmic drugs or electrical cardioversion defibrillator discharge (which is more traumatic, but more efficiently).
This object is achieved in that the patient is at the stage of preparation for farmacologiche�coy or electrical cardioversion were recorded electrocardiogram. During the registration electrodes were used with a silver chloride coating. Electrical signals from the electrocardiograph translated into digital code 12-bit analog-to-digital Converter.
Thus was formed the primary file ECG non-averaged one. Subsequent processing was performed using software package: Matlab 7.0, Microsoft Exel 2010. While in the program Matlab 7.0 from the digital code received sequence of time intervals R-R in milliseconds. Further processing was carried out in Microsoft Excel 2010 using averaging "sliding window", where the mathematical duration of the window was equal to the length of the source file.
The calculation was performed according to the following formula:
lim a - coefficient biochronological regularity of the rhythm (relative units),
a - values of the intervals R-R (milliseconds),
n is the number of intervals,
m - the number of cycles of averaging,
k - �Omer average interval.
At the end of the calculation, the patients were divided into 3 groups according to the degree biochronological regularity of the rhythm:
(A) Low probability - the likelihood of restoration of sinus rhythm of less than 10% (lim a<5,5).
(B) Electric - the probability of recovery of rhythm by electrical cardioversion, more than 90% (5,5≤lim a≤6,5).
C) Pharmacological - the probability of recovery of rhythm by pharmacological cardioversion, more than 90% (Lim a>6,5).
This allows high sensitivity and specificity to assess the likelihood of restoration of sinus rhythm in patients with paroxysmal form of atrial fibrillation.
This method can be implemented through the application of modern electrocardiographs with the possibility of registering a digital electrocardiogram, followed by the construction of the sequence of durations of R-R intervals.
The method is implemented as follows.
The patient at the stage of preparation for cardioversion is registered within 10 minutes of ECG, which is using the analog-to-digital Converter translates the digital code. Subsequent processing is performed using the software package Matlab 7.0, Microsoft Exel 2010. While in the program Matlab 7.0 from the digital code sequence obtained from the duration of the intervals R-R in milliseconds. Further processing is carried out in Microsoft Excel 2010 using averaging "sliding window", where the mathematical duration of the window is equal to the length of the source file.
This averaging is described by the formula:
the result is an indicator biochronological regularity of heart rhythm.
An example implementation of the method
1. Patient L., aged 57, case history No. 45551, was admitted to the hospital naval and military medical Academy hospital therapy 12.10.2010 G. with complaints of disruption of the heart, shortness of breath, inspiratory in nature, resulting from slight exertion. Diagnosis: Ischemic heart disease, arrhythmic option. Atherosclerosis of the aorta, the coronary arteries. Atherosclerotic cardiosclerosis with rhythm type-paroxysmal forms of atrial fibrillation. The paroxysm of atrial fibrillation from 12.10.2010 g, tachysystolic option.HK-I. II FC CHF. On ECG atrial fibrillation with a heart rate of 115 per minute. Blockade of the anterior-upper branching left leg PU�ka of GIS.
To determine the success of restoration of sinus rhythm was performed to identify the value of biochronological regularity of heart rhythm and obtained its value 6,7594, it means that the success of pharmacological correction.
On the background of a saturating dose antiarrhythmic drug class III was restored sinus rhythm.
2. Patient A., 54 years old, medical history, No. 39587, was admitted to the hospital naval and military medical Academy hospital therapy 18.09.2010 G. with complaints of faults in work of heart. Diagnosis: Ischemic heart disease, arrhythmic option. Atherosclerosis of the aorta, the coronary arteries. Atherosclerotic cardiosclerosis with rhythm type-paroxysmal forms of atrial fibrillation. The paroxysm of atrial fibrillation from 18.09.2010 G., tachysystolic option. On ECG atrial fibrillation with a heart rate of 108 per minute.
To determine the success of restoration of sinus rhythm was performed to identify the value of biochronological regularity of heart rhythm and obtained its value 5,854, which indicates the possibility of successful electrical cardioversion.
On the background of a saturating dose antiarrhythmic drug class III sinus rhythm was not restored. Restoration of sinus rhythm was achieved electrical dis�Ohm defibrillator energy 300 j.
3. Patient L., 55 years old, medical history, No. 48492, was admitted to the hospital naval and military medical Academy hospital therapy 25.10.2010 G., complaining of the disruption of the heart, shortness of breath, inspiratory character. Diagnosis: Ischemic heart disease, arrhythmic option. Atherosclerosis of the aorta, the coronary arteries. Atherosclerotic cardiosclerosis with rhythm type-paroxysmal forms of atrial fibrillation. The paroxysm of atrial fibrillation from 25.10.2010 g, tachysystolic option.HK-I. II FC CHF. On ECG atrial fibrillation with Sspov minute.
To determine the success of restoration of sinus rhythm was performed to identify the value of biochronological regularity of heart rhythm and obtained its value 4,586, indicating a low probability of successful relief of the paroxysm of atrial fibrillation.
On the background of a saturating dose antiarrhythmic drug class III sinus rhythm was not restored. Restoration of sinus rhythm was not achieved three posledovatelnyi electrical discharges defibrillator energy 300-360-360 J.
Thus, it is shown that the definition of the coefficient biochronological orderliness heart rhythm allows to identify patients who have a 90% chance that it will be docked a paroxysm of atrial preset�th.
The proposed method of determining the success of restoration of sinus rhythm is simple, affordable and can be used in clinical practice.
A method for predicting recovery of sinus rhythm in patients with paroxysmal form of atrial fibrillation by registration of rythmogram and subsequent mathematical averaging method "sliding window", characterized in that determine the coefficient biochronological regularity of the rhythm by the formula:
lim a - coefficient biochronological regularity of the rhythm (relative units),
a - values of the intervals R-R (milliseconds),
n is the number of intervals,
m - the number of cycles of averaging,
k is the number of the averaged interval,
and when the value of lim (a<5,5 - likelihood of restoration of sinus rhythm as pharmacological and electrical cardioversion less than 10%,
lim a (≥5,5; ≤6,5) - the probability of the restoration�termination of rhythm by electrical cardioversion, more than 90%,
lim a>6,5 - the probability of recovery of rhythm by pharmacological cardioversion of over 90%.
SUBSTANCE: there are determined: peak expiratory flow rate (PEFR), l/min, and reference peak expiratory flow rate (PEFRR), l/min; child's age (A), completed years, height (H), cm; body weight (W), kg accurate to 0.1 kg; coefficients are established as followed: sexual identity (S) - 1 for males, 0 - for females; severity of the clinical course (S) - 1 mild BA, 2 moderate BA, 3 severe BA; baseline therapy (BT) prescribed - 1 if the child has been receiving the therapy for one pre-examination year, 0 has not; a degree of severity of BA episode (SE) - 1 mild degree of severity of the episode, 2 - moderate degree of severity of the episode, and 3 severe episode. A peak expiratory flow rate coefficient (PEFRC) is calculated as the relation (PEFR/PEFRR)×100%. Cardiointervalography is performed, and a vagosympathetic balance coefficient is calculated (LF/HF). An efficacy coefficient (K) of the preparation Berodual for rapid relief of the bronchial asthma episode is described by formula; if K>12, the rapid relief of the bronchial asthma episode the preparation Berodual is considered to be effective.
EFFECT: method enables providing more reliable assessment of using the preparation Berodual for rapid relief of the bronchial asthma episode in a child that is ensured by collective assessment of clinical and functional signs of the patient's health.
SUBSTANCE: patient's monitor comprising: EEG recorder (14, 20) controlling patient's (10) electrocardiographic signal (40); a secondary physiological signal monitor (16, 20) controlling a second patient's physiological signal (50) simultaneously with the EEG recorder controlling patient's electrocardiographic signal; an a alarm detector (42, 44) configured to detect the alarm on the basis of the patient's electrocardiographic signal; alarm verification device (52, 54, 56) configured to verify the alarm on the basis of pulse component regular pattern of the simultaneously controlled second patient's physiological signal; and an alarm indicator (24, 26, 58) configured to generate the perceived alarm by the alarm detector and to verify the alarm by the alarm verification device.
EFFECT: alarm verification.
12 cl, 5 dwg
SUBSTANCE: invention refers to medicine, and can be used in cardiology, endocrinology, functional diagnostics and can find application in diagnostics and selecting a therapeutic approach to ischemic heart disease. The following risk factors are detected in the patients suffering from diabetes mellitus accompanied by cardiovascular disorders: blood plasma glucose, glycated haemoglobin (HbAlc), total blood plasma cholesterol, blood plasma low density lipoprotein cholesterol, blood pressure, load St segment depression, signs of carotid wall thickening, an ankle-brachial index and brachial endothelium-dependent vasodilatation as shown by the Doppler ultrasound, duration of diabetes mellitus; the derived values are scored. The derived scored values are summed up, and a risk of coronary artery atherosclerosis is stated to be low, moderate, high or very high.
EFFECT: method enables determining the risk of coronary artery atherosclerosis in the patients suffering from diabetes mellitus accompanied by cardiovascular disorders by assessing the clinical laboratory values and conducting instrumental tests, including electrocardiography, Doppler ultrasound and coronary angiography.
1 tbl, 2 ex
SUBSTANCE: mother's and foetus's heart rate variability is measured. A coefficient of variation the foetus's full array of RR intervals in the original state CV F I, a resistance index of the umbilical artery RI, a coefficient of variation of the mother's full array of RR intervals in the original state CV M, mother's RRmin in the period of recovery of a mental test RRmin M III are determined. ∑1, ∑2, ∑3 are calculated by formulas: ∑1=2 (original foetus's CV less than 5.4)+3 (RI less than 0.58)+3 (original mother's CV less than 7.8)+2 (original mother's RRmin less than 531); ∑2=2 (CV F I less than 5.4)+3 (RI more than 0.58)+2 (CV M I less than 0.78)+4 (RRmin M I less than 531); ∑3=3 (CV F I less than 5.4)+3 (CV M I less than 7.8)+3 (RI more than 0.58). The values ∑1 falling within the range of 0 to 2 show a low risk; within the range of 3 to 5 points - a moderate risk; from 6 to 10 points - a high risk; the values ∑2 from 0 to 2 show a low risk, from 3 to 5 points - a moderate risk, from 6 to 11 points - a high risk; the values ∑3 from 0 to 3 testifies to a low risk, from 4 to 9 points - to a high risk of unfavourable perinatal outcomes. The risks derived from the three values: ∑1, ∑2, ∑3 are used to evaluate a risk level of the unfavourable perinatal outcomes in intrauterine infection.
EFFECT: higher prediction accuracy.
3 ex, 6 tbl, 3 dwg
SUBSTANCE: invention refers to medicine, labour safety, vocational selection of rescue workers. The invention can be used for vocational selection in the sectors of industry using personal protective equipment, as well as for the workers labour safety in the sectors of industry with harmful working conditions. The method involves vocational selection and duty control on the basis of electroencephalogram (EEG) values and cardiological findings. The examination is performed prior to and when using the personal protective equipment. The cardiological examination involves assessing the heart rate variability with using the amplitude-frequency spectrum Fourier analysis VLF at a vibration frequency within the range of 0.0033-0.04 Hz, LF - at a frequency of 0.05-0.15 Hz and HF - at a frequency of 0.16-0.80 Hz, and is five-staged: initial resting state, mental work load, recovery of mental work load, hyperventilation load, recovery of hyperventilation load. At the beginning, the heart rate variations and EEG are examined prior to using the personal protective equipment. If any of the five stages of the heart rate variation examination shows the pulse more than 90 beats per minute, as well as changes from the normal values of: approximating entropy - less than 180, LF - less than 6 point, an alpha wave amplitude - to 12 vibrations per second and the presence of the paroxysmal activity by EEG, the prevailing sympathetic nervous system is stated, or if any stage of the heart rate variation examination shows the pulse less than 60 beats per minute, as well as changes from the normal values of: blood pressure - more than 140/90 mmHg, VLF - more than 130 points, HF - more than 16 points, an alpha wave amplitude - less than 25 mcV, the prevailing parasympathetic nervous system is stated; a low level of adaptation to the personal protective equipment is predicted, and a rescue work is not recommended during the vocational selection; the examination is terminated. If the heart rate variation and EEG prior to using the personal protective equipment fall within the normal values, the heart rate variation when using the personal protective equipment is started with the patient examined when using the personal protective equipment and performing a cycle ergometer test, and recording the hyperadaptotic changes of the assessed values: VLF - more than 130 points in relation to the normal value when using the personal protective equipment and LF and HF vibrations; an incomplete or unfinished adaptation to the personal protective equipment, and the rescue worker is suspended from work for several hours; if VLF is more than 130 points recorded 10-15 min after activating the personal protective equipment, a good adaptation level to the personal protective equipment is predicted.
EFFECT: method enables assessing the vegetative nervous function and predicting the rescue workers' adaptation level to the personal protective equipment.
11 tbl, 5 ex
SUBSTANCE: cardiorhythmography is recorded during an active orthostatic test, and a heart rate variability (HRV) is analysed. During the active orthostatic test, the patient is placed in an initial horizontal position, then transferred into the vertical position, and then into the horizontal position again. If the amplitude of HF waves initially increases more than LF waves in the horizontal position by more than 30%, a prevailing parasympathetic effect is diagnosed. If the amplitude of HF and LF waves decreases after the patient is transferred into the vertical position by more than 30% of the values in the initial horizontal position, vegetative insufficiency is diagnosed. If the amplitude of HF waves decreases after the patient is transferred into the vertical position by more than 80% of the initial value in the horizontal position, a fast adjustment of the parasympathetic department to the changes is diagnosed. If the amplitude of VLF waves increases after the patient is transferred into the vertical position by more than 30% of the initial value in the horizontal position, activation of the supra-segmentary vegetative nervous system is diagnosed.
EFFECT: method provides more reliable diagnosing that is ensured by determining the mechanism of orthostatic test adaptation.
2 tbl, 2 ex
SUBSTANCE: intraoesophageal pH monitoring and Holter monitoring are recorded daily. The heart rate variability is estimated in the aggregate with an analysis of a nocturnal heart rate trend. If finding more than 5 episodes of high heart rate dispersion coinciding with reflux episodes, or if a nocturnal structure comprises more than 50% of the episodes, the disturbed vegetative regulation of heart rhythm related to gastrooesophageal reflux disease is diagnosed.
EFFECT: technique enables diagnosing the extra-oesophageal manifestations of gastrooesophageal reflux disease at the early stage of the disease after the subjective manifestations have been observed.
SUBSTANCE: invention relates to medical equipment. An ECG monitoring system for detecting infarct-related coronary artery associated with acute myocardial infarction comprises the number of electrodes for data collection by electrical cardiac activity from various observing points spaced from the heart. An ECG data collection unit is related to the electrodes. An ECG processor responses to electrode signals to form a set of lead signals and detects ST rises in the lead signals. The display responses to the detected ST rises and graphically displays each set of the given ST rise in relation to the anatomical positions of the leads. The graphical display identifies the suspected infarct-related coronary artery or branch associated with acute ischemic stroke. The ECG signals is n-leads are received. The ECG signals are analysed for the consistency with the ST rise data. The each set of ST rises is graphically displayed in relation to the anatomical body positions. The stages of receiving and analysing are repeated some time later. The each set of ST rises derived some time later are graphically displayed and compared to the previous displayed ST rises. A comparative graphic display is used to display the time variation of a coronary disease symptom associated with the specifically identified coronary artery or branch.
EFFECT: using the invention enables reducing the length of diagnosing.
15 cl, 18 dwg
SUBSTANCE: invention relates to medicine, namely to cardiology. ECG examination is performed to patient. Registration of signal-averaged ECG and transesophageal electrocardiostimulation (TE ECS) are carried out. Duration of filtered wave "P" (FiP-P) of signal-averaged ECG, dispersion of wave "P" (Pd), frequency threshold of arrhythmia induction (FTAI) and its duration are determined by means of TE ECS, risk of atrium fibrillation development (RAFD) being determined by original mathematical formula. If RAFD values are to 0.5, high during 1-3 months risk of AF development is identified. If values are from 0.5 to 1.5 - average from 3 months to 1 year risk of AF development. If values are higher than 1.5 - low, more than 1 year risk of AF development is identified after the first examination of patient.
EFFECT: method increases accuracy of determining risk of AF development after the first examination due to analysis of interaction of ECG and TEECS indices.
5 tbl, 4 ex
SUBSTANCE: invention refers to medicine, specifically surgery and functional diagnostics. The supine heart rate is recorded and represents a baseline test, while the standing heart rate measured is an orthostatic test for 30 sec. The regulatory system activity index (RSAI) is described in points 1 to 10. An increase of this value relates to the deteriorating body adaptive possibilities; the RSAI value of 3-10 points enables predicting the postoperative wound complications.
EFFECT: method enables predicting the postoperative complications following the replacing hernia repair for postoperative hernias.
4 dwg, 3 tbl
FIELD: medicine, cardiology.
SUBSTANCE: one should register rhythmocardiogram, measure current total power in low-frequency and high-frequency areas of dynamic row of cardiointervals. Evaluation of psychophysiological state should be performed by the value of stress index S calculated due to original mathematical formula by taking into account the power of low-frequency and high-frequency constituents of the range of dynamic row of cardiointervals. In case of standard conditions of measurement - the rest lying at one's back position the value of S stress index should be considered to be equal to 1. The method enables to rapidly and noninvasively detect and range human psychophysiological state.
EFFECT: higher accuracy of evaluation.
2 dwg, 1 ex, 2 tbl
SUBSTANCE: method involves estimating vegetative tonus using cardiointervalography approach and its medication adjustment under cardiointervalography control. The cardiointervalography examination is carried out before applying treatment, in the course of and after the treatment. Each time vegetative tonus increment is estimated on the basis of voltage index. When applying medication adjustment, nootrop group preparations are used that are selected before applying treatment with initial vegetative tonus disorder distinguished by vagotonia or sympathicotonia being taken into account. Preparation or combination of preparations or their doses and application duration is adjusted on basis of vegetative status direction changes obtained from cardiointervalography examination data. The treatment is continued until vegetative status direction change stops towards normotonia.
EFFECT: enhanced effectiveness in selecting individual treatment course.
3 cl, 3 dwg
SUBSTANCE: method involves recording rhythmocardiogram. Then, spectral analysis of RR intervalogram components in frequency bandwidth from 0.04 to 0.4 Hz is carried out and information value Z is determined from formula Z=Ahf/Alf, where Ahf is the maximum of high frequency component in bandwidth from 0.14 to 0.4 Hz, Alf is the minimum of high frequency component in bandwidth from 0.04 to 0.14 Hz. Z value being greater than 45 and lower than 14, persons consuming narcotic drugs are detected. Z value being lower than 14, persons consuming sedative drugs like opium, morphine, heroine are detected. Z value being greater than 45, persons consuming psychostimulating drugs like cocaine, amphetamine, efedrone, sydnocarb are detected.
EFFECT: high reliability of screening study data.
4 cl, 6 dwg
FIELD: medicine, diagnostics.
SUBSTANCE: the method deals with monitoring the difference in signals obtained from N pickup units, where N ≥ 2, ECG, pulse, temperature and analysis of the range and variability of their rhythms, nonlinear chaotic fluctuations during the period of registration. During analysis one should detect the values for fractal dimensions of Hirst's index and informational Fischer's index standardized, correspondingly, by the average value during either nocturnal or diurnal period. One should conclude upon improved body state by the normalization of signals' difference of peridiurnal rhythm, increased fractal dimensions, Hirst's index, decreased standardized informational Fischer's index, and one should conclude upon worse physiological or pathophysiological processes according to the opposite alterations. The method enables to widen functional possibilities during diagnostics.
EFFECT: higher accuracy of diagnostics.
3 dwg, 6 ex
FIELD: medicine; cardiology.
SUBSTANCE: electrocardiogram of patients with arterial hypertension is subject to twenty-four-hours monitoring. Spectral analysis of variability of heart beating is conducted and low-frequency, very low frequency and high frequency wave components of heart beating are selected. Strength of wave components of heart beating is determined as general, day and night ones. Generalized factor W is calculated by original relation. Value of W is used for diagnosing absence or presence of hormone-active hyper-plastic process of adrenal glands.
EFFECT: screening testing at out-patient conditions.
2 ex, 2 tbl
FIELD: medicine; cardiology.
SUBSTANCE: electrocardiogram of patients suffering from arterial hypertension is subject to twenty-four-hours monitoring. Spectral analysis of variability of heart beating is carried out. Very low frequency, low frequency and high frequency wave components are selected. General, day and night strength of wave components of heart beating is determined. Any factor is estimated according to the data taken from the spreadsheet. Generalized factor Z is calculated by original mathematical relation. Value of Z is used for judging on level of influence of hormones of adrenal gland onto pace-maker activity of sinus node.
EFFECT: comfort at usage; higher efficiency at non-invasive application.
2 ex, 2 tbl
FIELD: medicine; functional medicine.
SUBSTANCE: method in based upon remote irradiation of human body with set of super wide-band electromagnet pulses with duration of 0,2-1,0 ns, repetition rate of 0,05-30,0 MHZ and average density of flow of energy at irradiated part of human body being equal or less than 0,2 mcW/cm2. Modulation component of pulse repetition rate is selected from received reflected signal which pulse repetition rate is determined by heart activity, which is used for forming heart beat rate signal. The latter is used additionally for estimating index of stress which value of index of stress is included into transmitted communication message of mobile phone.
EFFECT: prolonged monitoring of functional condition of human.
3 cl, 2 dwg
FIELD: medicine, cardiology.
SUBSTANCE: one should register a rhythmocardiogram, detect spectral values for variability of cardiac rhythm, calculate the value of autonomic index, calculate the value of autonomic tonicity by the following formula: AI/lnTp m sq. sec., where AI - autonomic index, lnTp - total power for the spectrum of variability of cardiac rhythm. At values above 3.1 one should diagnose severe flow of autonomic dystonia syndrome, at values being 3.1-2.2 - moderate flow of the mentioned disease, at values ranged 2.1-1.5 - light flow. The method enables to predict the development of hemodynamic disorders.
EFFECT: higher efficiency and accuracy of diagnostics.
FIELD: medicine; cardiology.
SUBSTANCE: device for processing intervals of electrocardiogram has plate with Q-T (J-T) and R-R scales applied onto the plate. Plate is additionally provided with legs, rod and scale pointer at the end, arrows, and catches disposed at ends of Q-T (J-T) scale, Q-Tc (J-Tc) correlated values curves and Q-Tc (J-Tc) scale related to them. Rod is divided by axis to parts to relate as 1:5 in such a way that shorter part of rod has to be movable leg and longer part has to be the pointer of Q-T (J-T) scale. Pointer takes "0" position of Q-T (J-) scale to rest against left catch when legs close up. Motionless arrow is disposed onto longer part of rod under pointer of Q-T and/or J-T scale at level of "0" position of R-R scale. Slider with lock is mounted onto pointer to move along pointer. Slider is provided with two arrows. Formulas for building curves of Q-Tc (J-Tc) corrected values are given.
EFFECT: higher speed and comfort at processing of electrocardiograms.
3 cl, 8 dwg, 1 tbl
FIELD: medicine, electrocardiography.
SUBSTANCE: the present innovation deals with measuring parameters of electrocardiosignal (ECS) ST-segment and their analysis to detect deviations against the norm. At every step of quantization one should form the readings of first-order differences and modules of first-order differences. One should memorize N of readings for the modules of first-order differences coming after ECS readings that correspond to the onset of cardiocycle. Then it is necessary to sum up memorized values of modules and at every step of quantization one should compare the obtained current sum value with previous one. It is necessary to memorize the greater of them and according to maximal value one should form threshold level to compare current value of modules sum. Time moments when sum value is at first greater and then lower against threshold level one should consider to be, correspondingly the onset and the end of ST-segment. Time segment between the onset and the end of ST-segment should be considered as duration of ECS ST-signal. Device to isolate ECS ST-signal on-line contains a block for forming ECS, a block for primary ECS processing, a quantization block, a block for isolating the point of cardiocycle onset and measurement of its duration, a block to form first-order differences, a block to form modules of first-order differences, a block to memorize readings for the modules of first-order differences, a block to detect the number of summarized readings for the modules of first-order differences, a summarizing block, a block to form a threshold level, a block for comparison and a key device. The innovation enables to isolate ST-segment more reliably for wider class of electrocardiograms at different modifications of QRS-complex form.
EFFECT: higher efficiency.
2 cl, 12 dwg