The main components of dynamic electrocardiograph

Dynamic electrocardiograph consists of two parts: Ltd.

(1) Recorder carried by patients; (2) Playback and display analysis of the host. Ltd.

With the development of memory technology and medical digital signal processing technology, digital continuous recording Holter system has gradually replaced the traditional tape type and become the mainstream product. The number of recorded leads also increased from 3 to 12-18. With the extensive use of pacemakers, ECG analysis and ventricular late potential analysis based on high sampling rate and high precision A/D technology have become a hot research topic in Holter technology. Dynamic ECG recorder is a key component, which directly determines the overall performance of Holter system. The acquisition rate of conventional Holter system for arrhythmia analysis is generally below 250 Hz, while the information of pacing pulse and ventricular late potential contains frequency components below 100 Hz. Only when the acquisition rate is above 1000 Hz, can it be recorded completely, preferably at 4000 Hz. For this purpose, the ECG pulses were collected and recorded in one channel at 4000Hz, and ECG was recorded in the other two channels. Because the recording capacity of 24 H12 lead ECG will be as high as 1GB, efficient data compression is necessary. Because the data acquisition rate is still 250Hz, the recorded blog waveform will be seriously distorted.

At present, most users prefer to buy uncompressed storage recorders to prevent the distortion of recording waveforms. Usually, the data recording and transmission scheme is based on the universal serial bus (USB) transmission technology with flash memory as the recording medium, which is divided into two types: external (plug-in) and built-in, and commonly used is built-in. In addition, chip memory recorder is also the future development trend. With the rapid development of electronic technology and computer technology, the digital integrated circuit ECG recorder is more compact, the amount of information recorded and the recording time is longer, the analysis function of the main processing system is more powerful, and the EEG machine makes the recording and analysis of Holter system faster and faster. In addition, with the development of software technology, the amount of information provided by the system has also been greatly improved. In the past, only several common arrhythmias could be edited and analyzed, but now dozens of complex arrhythmias can be edited and analyzed. In addition, sinus heart rate turbulence (HRT), microvolt T wave Alternation (TWA), sleep apnea screening and evaluation of atrioventricular node function have been developed, which are of great significance for detecting high-risk sudden death patients and detecting cardiac function. Ltd.