The first non-invasive chest pressure measuring device of the Fourth Military Medical University

Release date: 2007-02-06

The Fourth Military Medical University pioneered the non-invasive thoracic pressure measuring device. The Fourth Military Medical University Tangdu Hospital, the military ultrasound instructor, Cao Tiesheng, Duan Yunyou and others, after more than 10 years of basic research and clinical trials, the first international non-invasive chest The pressure measuring device, the "new hypothesis of the mechanism of respiratory affecting heart function", was further confirmed. Recently, the research results were published in the international authoritative magazine "American Journal of Echocardiography". Relevant experts at home and abroad highly praised: "The research and its devices are simple and practical, non-invasive, and have important significance for theoretical research and clinical application."
For a long time, there have been many studies in the medical community about the effects of respiration on cardiac function, but so far there is no conclusion. Cao Tiesheng, Duan Yunyou and others based on years of basic research and hemodynamic principles and simulation experiments, put forward a new hypothesis of "breathing affects heart function mechanism". To further prove the "new hypothesis", they modified the sphygmomanometer and designed a simple device to measure changes in the chest pressure of the human body.
The modification method and working principle: the cuff of the sphygmomanometer and a part of the rubber tube are removed, and a piece of the mouth piece is attached, and a thin rubber pad is arranged at the end of the mouth piece as a single-guide gas valve to prevent air leakage during inhalation without affecting Exhale; because the chest pressure change during resistance breathing is negative, adjust the pointer of the sphygmomanometer to +100 mm Hg as a zero point. During the examination, the subject uses a nose clip to block the nostril, and one end of the mouth member is placed on the mouth to perform resistance breathing. The chest pressure should be the sum of the end-expiratory chest pressure and the inhalation pointer change reading.
The results of this study further prove that changes in respiratory chest pressure lead to changes in blood flow velocity of various valves, and thus are the driving force of cardiac function and respiration changes, which provides a powerful test for further verification of the new hypothesis of respiratory effects on cardiac function. Experimental basis. The results of this experiment also provide experimental data and theoretical basis for the clinical application of this hypothesis, such as non-invasive measurement of left ventricular end-diastolic pressure, pulmonary artery pressure and quantitative pericardial hemodynamic damage; the results of the study are also clinically Interpretation of the phenomenon, such as: the occurrence of strange veins in asthma patients has important guiding significance (the airway resistance is significantly increased during asthma attacks, so that the changes in respiratory chest pressure increase correspondingly, the aortic valve respiratory blood flow fluctuation index will be significant It increases, which leads to odd pulse, and provides another important indicator for judging the severity of diseases such as asthma and chronic obstructive pulmonary disease. —— Information from: Shanghai Medical Device Industry Association

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