CN110946569B - Multichannel body surface electrocardiosignal synchronous real-time acquisition system - Google Patents

Abstract

The invention discloses a multichannel body surface electrocardiosignal synchronous real-time acquisition system, which comprises a 64-lead body surface electrocardiogram acquisition integrated box and an electrocardio-lead patch; the 64-lead body surface electrocardiogram acquisition integrated box is formed by connecting 8 10-channel dynamic electrocardiogram recording boxes in parallel, and acquires 64-channel body surface electrocardiograms synchronously and in real time. The invention adopts 64 multi-lead body surface electrode positions optimized by clinical data to fully and completely reflect body surface electrocardio activity information under the limited number of leads; the mature dynamic electrocardiogram acquisition box is adopted, the synchronous acquisition purpose is achieved in a parallel connection mode, the method is innovative, and more channels can be further expanded according to clinical requirements; can be used for analyzing various clinically common arrhythmia (such as ventricular premature beat origin point positioning), myocardial infarction (such as acute myocardial infarction part judgment), cardiomyopathy (such as hypertrophic cardiomyopathy and the like) and the like, and has higher clinical transformation prospect and clinical diagnosis application value.

Description

A multi-channel body surface ECG signal synchronous real-time acquisition system

technical field

The invention belongs to the field of electrocardiographic signal acquisition and analysis technology and equipment, and in particular relates to a multi-channel body surface electrocardiographic signal synchronous real-time acquisition system.

Background technique

Conventional 12-lead body surface electrocardiogram is a traditional clinical judgment method, which has been used for analyzing and diagnosing arrhythmia for more than 100 years, such as locating the origin of ventricular premature beats and atrial premature beats. However, the conventional 12-lead ECG has its inherent defects, such as non-standard lead placement, inaccurate graphics due to heart transposition, thoracic anatomy, and individual patient heterogeneity, and low mapping accuracy. There is only a limited number of leads, resulting in low accuracy of conventional 12-lead ECG in diagnosing arrhythmia, and the heterogeneity among different judges is large, especially for some body surface information reflected on the back of the human body that cannot be captured in time. Such as the specific changes of the back body surface ECG in acute posterior wall and inferior wall myocardial infarction. Therefore, how to use the limited number of body surface ECG leads to more accurately, comprehensively and effectively reflect and record body surface ECG signals has always been a hot spot in the research and application of electrocardiology.

Therefore, in the early 19th century, the body surface potential mapping technology based on the conventional 12-lead body surface electrocardiogram came into being. This technology significantly extends the application range of the standard 12-lead ECG. It uses more body surface electrodes, a wide range of body surface distribution, and relatively fine analysis, so it can obtain more, more subtle, and more comprehensive cardiac electrical activities than conventional ECGs. The change rule has strong scientific research and clinical application value. But so far, there is no mature product on the market for synchronous and real-time collection of multi-channel and multi-lead ECG information on the body surface for analysis of various arrhythmias. Some clinical studies have proposed the use of flexible electrode strips on the body surface, each strip contains 8-10 electrodes, and multiple electrode strips are used to collect multi-channel body surface ECG information, but the above-mentioned schemes exist Defects, if the equipment is used for scientific research, each electrode block on the strip has not been clinically verified for the collection of weak ECG signals on the body surface, and the effective contact between the electrode blocks on the strip and the human body and the effective Problems such as accurate extraction, large noise and clutter interference processing have not yet been satisfactorily solved. At the same time, the use of fixed electrode strip length and structure cannot effectively achieve accurate positioning of each collection point for different body surface structures of different individuals. collection. However, some other studies have adopted a vest-type scheme. Multiple electrode blocks are set in the vest to collect multi-channel body surface ECG signals. There are also differences in the above-mentioned electrode contact and collection accuracy, and the collection points of different individuals. issues such as sex. At the same time, the above scheme does not adopt the recognized and effective acquisition scheme based on the Wilson ECG lead system when collecting body surface ECG, so the accuracy, effectiveness and clinical application value of the acquired signal are limited.

Contents of the invention

The object of the present invention is to provide a multi-channel body surface electrocardiographic signal synchronous real-time acquisition system for the deficiencies of the prior art.

The purpose of the present invention is achieved through the following technical solutions: a multi-channel body surface electrocardiogram synchronous real-time acquisition system, which includes a 64-lead body surface electrocardiogram collection integrated box and an electrocardiogram lead patch; The connected patch is connected to the 64-lead body surface ECG collection integrated box composed of eight 10-channel dynamic ECG recording boxes in parallel, and the 64-channel body surface ECG is collected synchronously and in real time.

Further, the synchronous real-time acquisition of 64-channel body surface electrocardiogram is specifically: mark eight 10-channel dynamic electrocardiogram acquisition boxes as No. 1-8 dynamic acquisition boxes respectively; each dynamic acquisition box collects 10-channel body surface electrocardiogram data , 2 of the channels are marked as RA and RL reference leads, which are respectively fixed at the distal end of the right upper limb and the proximal end of the right lower limb, and the remaining 8 channels are marked as 8 leads for collecting body surface ECG; among them, No. 1 dynamic The reference lead channels of the acquisition box are RA1 and RL1, and the acquisition leads of the body surface ECG are marked L1-L8, which are respectively fixed at the positions marked 1-8; the reference lead channels of the No. 2 dynamic acquisition box are RA2 and RL2, and the acquisition The lead marks are L9-L16, which are respectively fixed at the positions marked 9-16; the reference lead channels of No. 3 dynamic acquisition box are RA3 and RL3, and the leads for body surface ECG acquisition are marked L17-L24, which are respectively fixed at the marks 17-24 Position; the reference lead channels of the No. 4 dynamic acquisition box are RA4 and RL4, and the surface ECG acquisition leads are marked as L25-L32, which are respectively fixed at the positions marked 25-32; the reference lead channels of the No. 5 dynamic acquisition box are RA5 and RL5 , the body surface ECG acquisition leads are marked as L33-L40, which are respectively fixed at positions marked 33-40; the No. 6 dynamic acquisition box reference lead channels are RA6 and RL6, and the body surface ECG acquisition leads are marked as L41-L48, which are respectively fixed At the positions marked 41-48; the reference lead channels of the No. 7 dynamic acquisition box are RA7 and RL7, and the acquisition leads of the body surface ECG are marked L49-L56, which are respectively fixed at the positions marked 49-56; the reference lead channels of the No. 8 dynamic acquisition box are connected The tracks are RA8 and RL8, and the surface electrocardiogram acquisition leads are marked L57-L64, which are respectively fixed at positions marked 57-60.

Further, the numbers 1-49 are distributed on the front chest of the body surface, and the numbers 50-64 are distributed on the back of the body surface; the upper boundary of the number 1-64 distributed on the front chest of the body surface is the flat suprasternal fossa, and the lower boundary is located at the umbilicus The horizontal lines are divided into 7 rows and 11 columns; among them, the labels 1-3 are distributed along the right midaxillary line; the labels 4-6 and 7-9 are respectively distributed on both sides of the right midclavicular line, and the columns where the labels 4-6 are located are in the right The position of the middle parallel line between the midclavicular line and the right anterior axillary line, and the markings 7-9 are at the position parallel to the middle line between the right midclavicular line and the right parasternal line; the markings 10-16 and 17-23 are distributed along the right and left parasternal lines respectively, and the markings are 38-41 are distributed along the left midclavicular line, and the rows of numbers 24-29, 30-31, and 32-37 are distributed between the left parasternal line and the left midclavicular line in sequence with equal intervals, and the numbers 42-45 are along the left axilla Distributed on the front line, the marks 46-49 are distributed along the left midaxillary line; the upper boundary of the distribution of the above marks 1-64 on the back of the body surface is level with the 4th thoracic vertebra, and the lower boundary is equal to the height of the 10th thoracic vertebra, with 3 rows and 5 columns in total; The marks 50-52 are distributed along the left posterior axillary line, the marks 53-55 and 62-64 are distributed along the subscapular lines of the left and right sides respectively, and the marks 56-58 and 59-61 are distributed along the left and right sides of the spine respectively line distribution; among them, labels 10 and 17 are located on the same horizontal plane, which is the first floor; labels 4, 7, 11, 18, 24, 32, 50, 53, 56, 59, and 62 are distributed on the same horizontal plane, which is the second floor; Numbers 12, 19, 25, 33, and 38 are located on the same horizontal plane, which is the third floor; Numbers 1, 5, 8, 13, 20, 26, 30, 34, 39, 42, 46, 51, 54, 57, 60 and 63 are distributed on the same horizontal plane, which is the 4th floor, located at the level of the 4th intercostal space; numbers 2, 14, 21, 27, 31, 35, 40, 43, 47 are located on the same horizontal plane, which is the 5th floor; numbers 3, 6, 9, 15, 22, 28, 36, 41, 44, 48, 52, 55, 58, 61, and 64 are distributed on the same level, which is the sixth floor; labels 16, 23, 29, 37, 45, and 49 are located on the same level , is the 7th layer; among them, the marked levels of the 1st to 3rd layers are located above the level of the 4th intercostal space, and are evenly distributed at intervals of 3 cm; the marked levels of the 5th to 7th layers are located below the level of the 4th intercostal space, and are evenly distributed at an interval of 3 cm.

Further, the 64-lead body surface electrocardiogram acquisition integrated box uses the Wilson central electrical terminal generated by RA1-RA8 and the corresponding RL1-RL8 as the voltage reference, the sampling frequency is 1000Hz, one channel per 2 bytes, 15-bit A/ D conversion, the baseline is 2^14, and the amplitude range is ±5mv.

Further, the ECG lead patch is connected to the 64-lead body surface ECG collection integrated box through a fully shielded cable and lead wires.

The beneficial effects of the present invention are:

1. The present invention adopts 64 multi-lead body surface electrode positions optimized by clinical data, which can fully and completely reflect body surface electrocardiographic activity information under a limited number of leads;

2. The present invention adopts special body surface electrocardiogram patches and connecting wires, which ensure the accuracy of electrocardiographic signal acquisition and the integrity of electrocardiographic signal transmission compared with the previous methods such as array electrodes, strip electrodes, and electrocardiographic collection vests. ;

3. The present invention adopts a mature dynamic electrocardiogram acquisition box to achieve the purpose of synchronous acquisition through parallel connection, which is innovative in method, and can further expand 64 channels to more channels according to clinical needs;

4. The present invention is used to analyze clinically common various arrhythmias (such as ventricular premature beat origin point positioning), myocardial infarction (such as acute myocardial infarction site judgment), cardiomyopathy (such as diagnosis of hypertrophic cardiomyopathy), etc. High clinical transformation prospects and clinical diagnostic application value.

Description of drawings

Fig. 1 is a schematic diagram of a multi-channel body surface electrocardiogram collection box and a collection and analysis method;

Figure 2 is a schematic diagram of the positioning and placement of the 64-lead body surface ECG patch;

Fig. 3 is the 64-lead body surface electrocardiogram obtained by body surface electrocardiogram processing and analysis software;

Fig. 4 is a schematic diagram of positioning and placement of a 64-lead body surface ECG patch;

Fig. 5 is a working schematic diagram of a multi-channel body surface electrocardiogram acquisition box;

Figure 6 is a 64-lead surface electrocardiogram of a patient with premature ventricular contractions.

detailed description

The present invention provides a 64-channel body surface electrocardiogram synchronous real-time acquisition system to collect 64-channel body surface electrocardiogram and transmit it to the workflow of analysis software as shown in Figure 1, mainly including:

1. Based on the mature product-10-channel dynamic ECG recording box, the 64-lead body surface ECG collection integrated box, and the synchronous collection scheme;

Multi-channel body surface electrocardiogram acquisition box and synchronous acquisition scheme: the present invention adopts eight 10-channel dynamic electrocardiogram acquisition boxes, which are respectively marked as No. 1-8 dynamic acquisition boxes (collection boxes 1#-8#). Each dynamic electrocardiogram collection box can collect 10 channels of body surface ECG data. We label 2 of the channels as RA (right arm) and RL (right leg) leads, and fix the leads to the distal end of the right upper limb and the right arm respectively. The proximal end of the lower extremity is used to provide the Wilson central electrical terminal and serves as the voltage reference of each dynamic ECG collection box; the remaining 8 channels are marked as 8 leads for collecting body surface ECG. At the same time, 8 dynamic acquisition boxes are connected in parallel to obtain a multi-channel ECG acquisition box that can collect 64-channel body surface ECG in real time based on the Wilson central electrical terminal as a reference voltage. Connect its signal output module to a computer to transmit and acquire multiple data in real time channel body surface ECG signal data; and perform clock and baseline calibration so that each dynamic acquisition box starts signal acquisition at the same time. After setting in parallel, the reference lead channels of the 1# acquisition box are RA1 and RL1, which are fixed on the right upper and lower limbs, and the surface ECG acquisition leads are marked as L1-L8, which are respectively fixed on the labels 1- 8 positions; the reference lead channels of the 2# acquisition box are RA2 and RL2, which are fixed on the right upper and lower limbs, and the surface ECG acquisition leads are marked as L9-L16, which are respectively fixed at positions 9-16 in Figure 2 above; The reference lead channels of the 3# collection box are RA3 and RL3, which are fixed on the right upper and lower limbs. The reference lead channels of the box are RA4 and RL4, which are fixed on the right upper and lower limbs, and the surface ECG acquisition leads are marked as L25-L32, which are respectively fixed at the positions marked 25-32 in Figure 2 above; 5# collection box reference lead The connecting channels are RA5 and RL5, which are fixed on the right upper and lower limbs, and the surface ECG acquisition leads are marked as L33-L40, which are respectively fixed at the positions marked 33-40 in Figure 2 above; the reference lead channel of the 6# collection box is RA6 and RL6 are fixed on the right upper and lower limbs, and the surface ECG acquisition leads are marked L41-L48, which are respectively fixed at the positions marked 41-48 in Figure 2 above; the reference lead channels of the 7# acquisition box are RA7 and RL7 , fixed on the right upper and lower limbs, the surface ECG acquisition leads are marked L49-L56, which are respectively fixed at the positions marked 49-56 in Figure 2 above; the reference lead channels of the 8# acquisition box are RA8 and RL8, which are fixed on For the right upper limb and right lower limb, the surface electrocardiogram acquisition leads are marked L57-L64, which are respectively fixed at positions marked 57-60 in Figure 2 above. The parameters of the 64-channel body surface ECG acquisition equipment after parallel connection are as follows: the Wilson central electrical terminal generated by RA1-8 and RL1-8 is used as the voltage reference, the sampling frequency is 1000Hz, one channel per 2 bytes, 15-bit A/D conversion, The baseline is 2^14, and the amplitude range is ±5mv.

2. The positioning and placement method of the 64-lead ECG lead patch;

Multi-channel body surface ECG lead positioning and placement scheme: The body surface positioning and placement scheme of the 64-lead dedicated body surface ECG patch used in the present invention is shown in Figure 2 below. Each black dot in the figure represents the position of an electrocardiogram electrode patch, from number 1 to number 64; among them, numbers 1-49 are distributed on the front chest of the body surface, and numbers 50-64 are distributed on the back of the body surface. The 64 patches are distributed on the body surface in the anterior chest, the upper border is flat to the suprasternal fossa, and the lower border is located at the level of the umbilicus. They are divided into 7 rows and 11 columns, and the number of electrodes in each column varies. Among them, the label 13 corresponds to the V1 position of the conventional 12-lead ECG, the label 20 corresponds to the V2 position of the conventional 12-lead ECG, the label 40 corresponds to the V4 position of the conventional 12-lead ECG, the label 43 corresponds to the V5 position of the conventional 12-lead ECG, and the label 47 corresponds to Conventional 12-lead ECG V6 position. Labels 1-3 are distributed along the right midaxillary line; labels 4-6 and 7-9 are distributed on both sides of the right midclavicular line respectively, and the column of labels 4-6 is located in the middle parallel line between the right midclavicular line and the right anterior axillary line. 7-9 are located in the middle parallel line between the right midclavicular line and right parasternal line; labels 10-16 and 17-23 are distributed along the right and left parasternal lines respectively; labels 38-41 are distributed along the left midclavicular line; labels 24- 29. The columns of labels 30-31 and 32-37 are distributed between the left parasternal line and the left midclavicular line in sequence with equal intervals, labels 42-45 are distributed along the left anterior axillary line, and labels 46-49 are distributed along the left midaxillary line distributed. The upper boundary of the 64 patches distributed on the back of the body surface is equal to the 4th thoracic vertebra, and the lower boundary is equal to the height of the 10th thoracic vertebra, with a total of 3 rows and 5 columns. Labels 50-52 are distributed along the left posterior axillary line, labels 53-55 and 62-64 are distributed along the left and right subscapular lines respectively, and labels 56-58 and 59-61 are distributed along the left and right paraspinal lines respectively distributed. Labels 10 and 17 are located on the same horizontal plane, which is the first floor; labels 4, 7, 11, 18, 24, 32, 50, 53, 56, 59, and 62 are distributed on the same horizontal plane, which is the second floor; labels 12, 19, 25, 33, 38 are located on the same level, which is the third floor; labels 1, 5, 8, 13, 20, 26, 30, 34, 39, 42, 46, 51, 54, 57, 60 and 63 are distributed on the same level , is the 4th floor, located at the level of the 4th intercostal space; labels 2, 14, 21, 27, 31, 35, 40, 43, 47 are located on the same level, and are the 5th floor; labels 3, 6, 9, 15, 22 , 28, 36, 41, 44, 48, 52, 55, 58, 61, 64 are distributed on the same horizontal plane, which is the 6th floor; labels 16, 23, 29, 37, 45, 49 are located on the same horizontal plane, which is the 7th floor ; Among them, the 1st-3rd layer marked level is above the level of the 4th intercostal space, evenly distributed at an interval of 3cm; the 5th-7th layer marked level is located below the level of the 4th intercostal space, evenly distributed at an interval of 3cm.

The lead positions V1-V6 of the conventional 12-lead electrocardiogram are: V1: the fourth intercostal space on the right border of the sternum; V2: the fourth intercostal space on the left border of the sternum; V4: the intersection point of the left fifth intercostal space and the midline of the left clavicle; V3: at the midpoint of the line connecting V2 and V4; V5: at the junction of the left fifth intercostal space and the anterior axillary line; V6: at the junction of the left fifth intercostal space and the midaxillary line.

3. Body surface electrocardiogram data processing and analysis software.

The body surface electrocardiogram data processing and analysis software is used to collect, save and export 64-lead body surface electrocardiogram information in real time (Figure 3), and analyze various clinical application scenarios such as arrhythmia. The ECG collected at the location of the L1-L64 leads in the 64-channel ECG collection integrated box also covers the conventional 12-lead body surface ECG information, for example, L13 corresponds to V1 of the conventional 12-lead ECG, and L20 corresponds to the conventional 12-lead ECG V2 and L40 correspond to the conventional 12-lead ECG V4, L43 corresponds to the conventional 12-lead ECG V5, and L47 corresponds to the conventional 12-lead ECG V6.

Example

Step 1: Clean up the skin of the collected area on the chest and back of the collected person, and fix 64 special body surface ECG patches (disposable ECG electrodes, model LT-301, Shanghai Li Figure Medical Equipment Co., Ltd., Shanghai, China) (Figure 4);

Step 2: Connect each dedicated body surface ECG patch to the L1-L64 position of the multi-channel ECG collection box through the dedicated ECG lead wire, and at the same time connect RA1-8 to the distal end of the right upper limb, and RL1-8 to the right Proximal lower extremity (Figure 4);

The dedicated electrocardiograph lead wire adopts fully shielded cables and lead wires, which has a strong anti-interference ability and ensures the accuracy of the electrocardiographic signal and the completeness of the electrocardiographic signal data.

Step 3: Turn on the 8 dynamic ECG collection boxes, and connect the ECG signal output wires to the host computer (Figure 5);

Step 4: Open the body surface ECG processing and analysis software for synchronous acquisition, obtain real-time, synchronous 64-channel body surface ECG and analyze various arrhythmias, such as the origin of ventricular premature beats, etc., and complete the storage and data export of the acquired ECG at the same time etc., as shown in Figure 6, based on the 64-lead body surface electrocardiogram, it can be preliminarily judged that the origin of ventricular premature beats in this patient is located in the right ventricular outflow tract of the heart.

Claims (1)

1. a multi-channel body surface electrocardiogram synchronous real-time acquisition system is characterized in that the system includes a 64-lead body surface electrocardiogram acquisition integration box and an electrocardiographic lead patch; the electrocardiographic lead patch is connected by 8 The 64-lead body surface ECG acquisition integrated box composed of 10-channel dynamic ECG recording boxes in parallel can collect 64-channel body surface ECG in real time simultaneously; The synchronous real-time acquisition of 64-channel body surface electrocardiogram is specifically: eight 10-channel dynamic electrocardiogram acquisition boxes are respectively marked as No. 1-8 dynamic acquisition boxes; each dynamic acquisition box collects 10-channel body surface electrocardiogram data, and the The 2 channels are marked as RA and RL reference leads, which are respectively fixed at the distal end of the right upper limb and the proximal end of the right lower limb, and the remaining 8 channels are marked as 8 leads for collecting body surface ECG; among them, the No. The lead channels are RA1 and RL1, and the lead marks of the body surface ECG acquisition are L1-L8, which are respectively fixed at the positions of labels 1-8; the reference lead channels of No. 2 dynamic acquisition box are RA2 and RL2, and the lead marks of the body surface ECG acquisition are They are L9-L16, which are respectively fixed at positions numbered 9-16; the reference lead channels of No. 3 dynamic acquisition box are RA3 and RL3, and the surface ECG acquisition leads are marked L17-L24, which are respectively fixed at positions marked 17-24; 4 The reference lead channels of the No. 5 dynamic acquisition box are RA4 and RL4, and the body surface ECG acquisition leads are marked as L25-L32, which are respectively fixed at the positions marked 25-32; the reference lead channels of the No. 5 dynamic acquisition box are RA5 and RL5, and the body surface The electrocardiogram acquisition leads are marked as L33-L40, which are respectively fixed at the positions marked 33-40; the reference lead channels of No. -48 position; No. 7 dynamic acquisition box reference lead channels are RA7 and RL7, body surface ECG acquisition leads are marked as L49-L56, which are respectively fixed at positions marked 49-56; No. 8 dynamic acquisition box reference lead channel is RA8 and RL8, the body surface ECG acquisition leads are marked as L57-L64, which are respectively fixed at positions marked 57-60; The labels 1-49 are distributed on the front chest of the body surface, and the labels 50-64 are distributed on the back of the body surface; the upper boundary of the labels 1-64 distributed on the front chest of the body surface is the flat suprasternal fossa, and the lower boundary is located at the umbilical level line. It is divided into 7 rows and 11 columns; among them, the labels 1-3 are distributed along the right midaxillary line; the labels 4-6 and 7-9 are respectively distributed on both sides of the right midclavicular line, and the columns of the labels 4-6 are located between the right midclavian line and The position of the middle parallel line of the right anterior axillary line, markings 7-9 are located at the middle parallel line of the right midclavicular line and right parasternal line; markings 10-16 and 17-23 are distributed along the right and left parasternal lines respectively, markings 38-41 Distributed along the left midclavicular line, the columns where the labels 24-29, 30-31, and 32-37 are located are distributed in turn between the left parasternal line and the left midclavicular line with equal intervals, and the labels 42-45 are distributed along the left anterior axillary line, Labels 46-49 are distributed along the left midaxillary line; the upper boundary of the distribution of the labels 1-64 on the back of the body surface is equal to the 4th thoracic vertebra, and the lower boundary is equal to the height of the 10th thoracic vertebra, with a total of 3 rows and 5 columns; of which the label 50 -52 is distributed along the left posterior axillary line, markings 53-55 and 62-64 are distributed along the left and right subscapular lines respectively, and markings 56-58 and 59-61 are distributed along the left and right paraspinal lines respectively; Among them, labels 10 and 17 are located on the same horizontal plane, which is the first floor; labels 4, 7, 11, 18, 24, 32, 50, 53, 56, 59, and 62 are distributed on the same horizontal plane, which is the second floor; labels 12, 19, 25, 33, 38 are located on the same level, which is the third floor; labels 1, 5, 8, 13, 20, 26, 30, 34, 39, 42, 46, 51, 54, 57, 60 and 63 are distributed in The same horizontal plane is the 4th floor, which is located at the level of the 4th intercostal space; the numbers 2, 14, 21, 27, 31, 35, 40, 43, 47 are located on the same horizontal plane, which is the 5th floor; the numbers 3, 6, 9, 15 , 22, 28, 36, 41, 44, 48, 52, 55, 58, 61, 64 are distributed on the same horizontal plane, which is the 6th floor; labels 16, 23, 29, 37, 45, 49 are located on the same horizontal plane, which is the 6th floor 7 layers; among them, the 1st-3rd layer marked level is above the level of the 4th intercostal space, evenly distributed at an interval of 3cm; the 5th-7th layer marked level is located below the level of the 4th intercostal space, evenly distributed at an interval of 3cm; The 64-lead body surface electrocardiogram acquisition integration box uses the Wilson central electrical terminal generated by RA1-RA8 and the corresponding RL1-RL8 as the voltage reference, the sampling frequency is 1000Hz, one channel per 2 bytes, 15-bit A/D conversion, The baseline is 2^14, and the amplitude range is

5mv; The ECG lead patch is connected to the 64-lead body surface ECG collection integrated box through a fully shielded cable and lead wires.

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