The effective use of volume capnography, however, requires a thorough understanding of its underlying physiological principles and the meaning and significance of derived measurements and calculations.Ĭarbon dioxide dead space ventilation ventilation–perfusion relationships volume capnography. Calculation of physiologic dead space: comparison of ventilator volumetric capnography to measurements by metabolic analyzer and volumetric CO2 monitor Respir Care. Thus, volume capnography provides a wealth of information about both respiratory and cardiovascular function, and it has many potential applications in critically ill patients. Derived measurements and calculations include the end-tidal, mean alveolar, and mixed expired carbon dioxide partial pressure (Pco 2) the volume of CO 2 exhaled per breath and per minute the airway, alveolar, and physiologic dead space volume the physiologic dead space to tidal volume ratio and expired minute ventilation, dead space ventilation, and alveolar ventilation. ![]() Volume capnography provides a noninvasive and continuous display of the fractional concentration or partial pressure of expired carbon dioxide versus exhaled volume.
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