METHOD AND DISPLAY APPARATUS FOR NON-INVASIVELY DETERMINING RESPIRATORY CHARACTERISTICS BY MEASURING BREATH GAS AND BLOOD GAS

摘要

PROBLEM TO BE SOLVED: To provide a method for non-invasively determining respiratory characteristics by measuring breath gas and blood gas. SOLUTION: The method for determining respiratory characteristics includes following steps: (a) inputting respiratory input parameters into an automatic operation device; (b) inputting an initial value of oxygen/carbon dioxide concentration V of mixed vein into the automatic operation device; (c) inputting an initial value of dead space rate X into the automatic operation device; (d) inputting an initial value of oxygen partial pressure A1 of pulmonary alveolar gas into the automatic operation device; (e) inputting the initial values to an operational routine provided in the automatic operation device; (f) calculating an estimated value of carbon dioxide partial pressure A2 of pulmonary alveolar gas; (g) calculating oxygen shunt rate Y1 and carbon dioxide shunt rate Y2; (h) determining respiratory characteristics related to oxygen/carbon dioxide partial pressure A* of pulmonary alveolar gas; (i) repeating steps (b) to (h) with a plurality of oxygen/carbon dioxide partial pressure values V*n of mixed vein as initial values so as to determine a plurality of oxygen/carbon dioxide partial pressure values A*n of pulmonary alveolar gas, as well as respiratory characteristics; (j) determining a specific respiratory characteristics; and (k) calculating cardiac output. COPYRIGHT: (C)2009,JPO&INPIT