smartie_7,siiina2,seymour واقعا ازتون ممنونم می شه توی ترجمه ی 3 پاراگراف دیگه هم کمکم کنید (واقعا شرمنده...gif)
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The required duration for each discrete collection of expired gas in to a Douglas bag should be determined by how quickly the bag becomes filled, which in turn depends on the minute ventilation. It is the requirement that determines sampling frequency, and therefore limits the utility of this technique in examining PGE kinetics. The need to 'fill' the bag is partly related to the need to average over a number of breaths, so it is important to only include a whole number of breaths in each collection of expirate. However , the need to adequately fill the bag is also related to minimizing several potential sources or error. An obvious source of error is inaccurate timing. One approach to ensure accurate timing is the addition of timer switches to the Douglas bag valves. Before considering the other sources of error, it is perhaps worth pointing out that any leak in the collection apparatus will induce an error, and that it is therefore important to check for leaks in the Douglas bag itself, the two-way valve, the connecting tubing and the three-way breathing valve.