![]() ![]() Accuracy of physiologic dead space measurements in patients with acute respiratory distress syndrome using volumetric capnography: comparison with the metabolic monitor method. ![]() In a study of mechanically ventilated ARDS patients, volumetric capnography measurements of physiologic dead‑space‑to‑tidal‑volume ratio were as accurate as those obtained by metabolic monitor technique ( Kallet RH, Daniel BM, Garcia O, Matthay MA. Volumetric capnography in the mechanically ventilated patient. ![]() doi:10.1183/09031913092)Ĭalculations derived from volumetric capnography are useful for identifying pulmonary embolism at the bedside ( Blanch L, Romero PV, Lucangelo U. Physiologically based indices of volumetric capnography in patients receiving mechanical ventilation. Then the stem should give you the PaO2 and with that you do PAO2 - PaO2 and you get an A-a gradient.The volumetric capnogram has been used successfully to measure anatomical dead space, pulmonary capillary perfusion, and ventilatory efficiency ( Romero PV, Lucangelo U, Lopez Aguilar J, Fernandez R, Blanch L. ![]() On the stem of the question for sure they will give you the PaCO2 and the PIO2 for you to calculate PAO2. One of the A-a gradient I have seen it and it is somewhat more complicated. You just have to rearrange the equation to get tidal volume and that is it. You will identify it when to use it when the stem of the question is asking you to calculate the tidal volume when the arterial CO2 is n number and the expired CO2 is m number with a physiologic dead space of x number. It is a pulmonary formula to figure out the physiologic dead space. U/fujiagar u/theDecbb u/PopKart Sure! It's basically what u/DrSlings said. ![]()
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