Meditsinskaia tekhnika
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The operational principle of the new mass-spectroscopic device for determining the gas content in blood is based on extracting gases from blood samples into vacuum volume and measuring their content with mass spectrometer. The increased sensitivity and measurement accuracy are achieved by raising the pressure of gases during the process of freezing out the water vapors as well as by making use of calibrating gas. ⋯ The low pressure in the extraction chamber favors complete removal of gases from the sample without using hemolyzing reagents. Besides O2 and CO2 it is possible to determine the content of other gases including narcotic and inert gases.
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Meditsinskaia tekhnika · Mar 1986
[System for indirect determination of cardiac stroke volume by intra-aortic balloon pumping].
Indirect measurements of the ejection fraction by using an intra-aortic pump-balloon allow the simultaneous assessment of myocardium contractility force and rate. They improve the qualitative evaluation of the cardiac muscle state. Errors in detecting the ejection fraction with the above technique do not exceed 10% when using a specially designed electric driver. The system should be recommended for use in biomedical research as it provides a wide range of output adjustments and high stability.