What Are the Different Types of EKG Leads?

The electrocardiograph was invented by William Einthoven (1860-1927). What is an electrocardiograph (machine) M311986 The electrocardiograph can automatically record the bioelectrical signals (ECG signals) generated by the myocardial excitement during cardiac activity. It is a medical electronic instrument commonly used in clinical diagnosis and scientific research. According to the number of recorder output channels in China, they are divided into single, three, six and twelve ECG machines.

The characteristics of the electrocardiograph in the 1980s are miniaturization and long recording time. The playback system uses a computer and can accurately calculate heart rate, ectopic heartbeat, and ST segment changes. Printing systems are generally equipped

ECG machines have different classification methods. Such as:

(I) Classification by machine function

According to the function of the machine, the electrocardiogram machine can be divided into ordinary electrocardiograph (analog electrocardiograph) and electrocardiograph (digital intelligent electrocardiograph) with graph tracing and analysis function.

(2) Classification by recorder

The recorder is the tracing element of the electrocardiograph. For analog electrocardiographs, the early recorders were mostly dynamic coil recorders with disc springs returning to zero torque, and position feedback recorders were mostly used after the 1990s. For digital ECG machines, the recorder is a thermal or dot-matrix printer.

1. Dynamic coil recorder: The structural principle of the dynamic coil recorder is a fixed magnetic circuit and a rotatable coil composed of magnetic steel. The output signal of the electrocardiograph power amplifier is applied to the coil of the recorder, and a stylus is fixed on the coil. When an ECG signal is output, the power amplifier outputs a current to the coil, and the coil rotates. When the deflection angle of the coil is the same as the return torque of the disc spring, stop the deflection. In this way, the recording pen driven by the coil traces the ECG waveform on the recording paper.

2. Position feedback recorder: The position feedback recorder is a recorder without mechanical return spring. The special electronic circuit can play the role of return spring. When the machine is powered off, the stylus of the position feedback recorder can be arbitrarily turned.

3. Dot-matrix thermal recorder: The thermal recorder uses semiconductor heating points sintered on a ceramic substrate to iron out graphics and characters on thermal paper that develops color when exposed to heat.

(3) Classification by power supply mode

According to the power supply method, it can be divided into DC type, AC type, and AC and direct-type ECG machine. Among them, cross and straight dual-use type are mostly. DC-powered type usually uses rechargeable batteries for power supply. The AC-powered type uses an AC-DC conversion circuit. The AC is first converted to DC, and then stabilized by a highly stable voltage regulator circuit before being supplied to the ECG machine.

(4) Dividing according to the signal derivative that can be recorded once

According to the signal derivatives that can be recorded at one time, the ECG is divided into single-lead and multi-lead types (such as three-lead, six-lead, and twelve-lead). The ECG signal amplification channel of the single-lead ECG machine has only one channel, and the ECG waveforms of each lead should be recorded one by one. That is, it cannot reflect the changes of the lead ECG at the same time. There are multiple channels for multi-lead ECG, such as six-lead ECG.

ECG Basic Information

Software name: Electrocardiograph

English name: Cardiograph

Electrocardiograph

Software type: Healthy bodybuilding

Software version: 2.4.3

Software language: English

Software size: 14.50 MB

Software current price: 12.00 (Please refer to iTunes real-time price)

Support system: Requires iOS 4.3 or later

Supported terminals: with iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch (4th generation), iPod touch (5th generation), iPad 2 Wi-Fi, iPad 2 Wi-Fi + 3G, iPad (3rd generation ), IPad Wi-Fi + 4G, iPad (4th generation), iPad Wi-Fi + Cellular (4th generation), iPad mini and iPad mini Wi-Fi + Cellular are compatible and optimized for iPhone 5. ^[2]

ECG Software Introduction

Cardiograph is a program for measuring heart rate. You can save the measurement results for later reference, and record the information of multiple users at the same time through multi-person file management. Use your device's built-in camera to take pictures of your fingertips and calculate the frequency of your heart-this method is also used by professional medical equipment.

Cardiograph is a tailor-made application that allows multiple people to use it simultaneously on a shared device. You can create their own profiles for your family and friends, and each has his own personal measurement history. Every measurement you make is saved to your personal history, so you can keep track of it all the time. Not only can you save the time and date of your heart rate measurement, you can also save the measurement locations (view their locations from the map), and even add quick markers to easily manage your history. ^[2]