Research On Bioimpedance Detection And Analysis Method Of Thoracic Blood Supply

In recent years,the mortality rate caused by cardiovascular disease has continued to rise.In the process of diagnosis and treatment,real-time assessment of thoracic blood supply plays a very important role.The thoracic bioimpedance signal and impedance differential signal measured by bioelectrical impedance technology carry a large amount of physiological information related to thoracic blood flow activity.These bioimpedance signals can accurately reflect the pumping function of the heart in real time,which is beneficial to the analysis of the blood supply status of the thoracic cavity.When the systolic and diastolic coordination performance of the heart declines without causing abnormal pump function,it is not comprehensive enough to analyze the blood flow state in the thoracic cavity through impedance and impedance differential signals.Impedance differential loop is composed of impedance and impedance differential signal.It has a closed loop with two waveform characteristics,which can more intuitively reflect the internal blood flow state during thoracic blood supply,and provide a better way to identify cardiovascular diseases.Complementary means of value.Combined with the theoretical basis of the human blood circulation system and the thoracic cylinder model,this paper proposes a method to study the blood supply state of the thoracic cavity based on the impedance differential loop,and realize the real-time detection of the blood flow in the thoracic cavity through this method.According to the generation mechanism and detection method of the thoracic bioimpedance signal,an experimental scheme for the acquisition of cardiopulmonary impedance signal is designed in this paper.Based on the proportional relationship between the breathing frequency and the heart beat,this paper changes the blood flow state in the thoracic cavity by changing the breathing frequency,and then studies the blood supply state of the thoracic cavity.Based on the characteristics of the impedance signal,the original data collected in the experiment is processed by the method of wavelet transform,and the processed impedance signal is located in a period of one cycle based on the cardiac cycle.Based on the positioning interval,the impedance differential loop is fitted and processed for the cardiopulmonary impedance signals in different states to complete the data acquisition and processing.In order to study the real-time blood flow in the blood supply state of the thoracic cavity,the impedance differential loops in different states were compared and analyzed.Combined with the theoretical basis of blood supply to the thoracic cavity,the waveform and area of the impedance differential loop are analyzed respectively.Based on the physiological significance of each phase of the impedance differential loop and the theoretical basis of the human blood circulation system,compared with the natural breathing state,combined with the changes of cardiac impedance and cardiac impedance differential signals under different breathing frequencies,the waveform of the cardiac impedance differential loop under constant frequency breathing is analyzed.Analyzed with changes in area.Secondly,based on the physiological significance of each time-phase area of the cardiac impedance differential loop,the phase area and total area of the cardiac impedance differential loop under different respiratory frequencies were compared and analyzed.In order to completely analyze the blood supply state of the thoracic cavity,a combined analysis of the cardiopulmonary impedance differential loop in the natural breathing state was carried out.The analysis of the experimental results shows that the state of blood supply to the thoracic cavity can be described in detail through the impedance differential loop,and the real-time flow of blood in the thoracic cavity can be obtained,which is beneficial to the diagnosis and detection of cardiovascular diseases.