According to BORSAM Biomedical，Dynamic ecg analysis system is composed of recording system, playback analysis system and printer. Professionals should have a general understanding of the key indicators that affect the quality of ecg waveforms from dynamic ecg recorders, namely, frequency response, sampling rate and resolution.
Dynamic ecg recorder frequency response
According to BORSAM Biomedical，Frequency response is the main index used to measure the performance of linear electronic system in the field of electronics. At present, the frequency response range of most dynamic electrocardiogram recorders is 0.5~60Hz. When the lower frequency limit is too high, the ST segment of the dynamic electrocardiogram waveform can be distorted. For example, if the upper limit of high frequency is not high enough, the dynamic ecg will show that the amplitude of Q wave,R wave and S wave will be low, and the shape will be smooth, and the R wave tangent and delta wave will disappear.
Sampling frequency of dynamic ecg recorder
According to BORSAM Biomedical，The sampling frequency refers to the number of points of ecg signal voltage collected by the dynamic ecg recorder every second. The higher the sampling frequency, the less distortion of the ecg waveform will be, and the data collected will describe the continuous ecg waveform more accurately. When the sampling frequency is too low, the amplitude of Q wave, R wave and S wave will decrease, and the waveform will be stepped, and the ecg will lose some meaningful information. According to BORSAM Biomedical，Therefore, it is necessary to apply the appropriate sampling frequency. According to boacoustics, at present, the sampling rate of most dynamic electrocardiogram recorders is 128, 256 and 512Hz, but for the system with a frequency response upper limit of 100Hz, the appropriate sampling frequency should be achieved, while for the recorder with pacemaker signal channel, the sampling frequency requirement is higher.
Resolution of dynamic ecg recorder
According to BORSAM Biomedical，Resolution refers to the ability to calculate sampled data and carry out analog-digital conversion to collect signals, represented by digital binary digits, with a minimum resolution of 8bit. When the resolution is 32bit, the computer operation level can be reached. Resolution can determine the accuracy of QRS amplitude measurement. The frequency response, sampling frequency and resolution of the dynamic electrocardiogram recorder should be a harmonious unity. If a lower resolution is adopted, the amplitude accuracy of QRS composite wave will be reduced. If the sampling frequency is too high, the recorded data will be multiplied, which will bring great burden to the download and storage of data and affect the efficiency of analysis.