Then the stem should give you the PaO2 and with that you do PAO2 - PaO2 and you get an A-a gradient.Comparison of two different methods for physiologic dead space measurements in ventilated dogs in a clinical setting Author: Mosing, Martina, Staub, Lukas, Moens, Yves Source: Veterinary anaesthesia and analgesia 2010 v.37 no.5 pp. 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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