Ardsnet tidal volume calculator2/17/2024 ![]() What is happening with your Minute Volumes? Nmbugs wrote:I was reading through this thread viewtopic.php?f=1&t=34491&st=0&sk=t&sd=a&start=30 and it seems my tidal volumes are too low. Perhaps that is when I have very shallow breathing which wouldn't trigger an apnea event but would surely show my TVs low, right? Did I just answer my own question, or is this logic flawed? I am assuming the TV if it isn't affected by my apneas then these are the times I would most likely be desaturating? I know desaturation happens during apnea events too but mine during the sleep study happened during non-apnea events. I have an okay understanding of peak flow (having asthma since I was 18) and now undergone several PFTs. Anyways I am not worried or panicked over the numbers just curious. My doctors are mainly grumbling and keeping me in the dark, waiting and wanting to see what NJ will do. Okay so FINALLY my question is what do these numbers mean? Since I am having fewer apneas I thought my TVs would have gone up but they haven't. Right now I can only track my night time desaturations when I can get the unit from my DME supplier which isn't that often but they use their own software (which didn't give times I desaturated just the lowest to highest and percentage of time spent in those periods) so I couldn't enter the data into my cpap software. My new pulse oxy should be here any day and it will be able to stay on all night and record all data (which sleepyhead will be able to read too). Now I know this data has its limits when it comes to accuracy but it at least it gives us something to go on. When looking at the chart on sleepyhead it looks like when I go into the 60s I stay there for some time and it comes in big chunks throughout the night (usually in the early morning from 2am-6).The max TV often corresponds when I have my leaks (aka lift my mask to scratch my nose, which always seems to itch once the cpap mask goes on ). However mine are as follows: Min 60 Med 340 95% 480 Max 740. Wow what a change, my AHIs dropped to under 4AHIs every night!! Still desaturating but I have to look at the positives whenever I can.Īccording to the above linked thread my tidal volume (weight x5 then weight x7) should be 585 and 819. After being on the autoset for 45 days my AHIs were still pretty hig, running between 10-13AHI and still desaturating even with oxygen so my doctor suggested I stop my sleeping medicine. I am on oxygen 24/7 along with Resmed S9 autoset, pressures 6-13. The reduced mortality observed with the ARDSNet strategy may have been due to the protective effect of a higher PEEP(total).I was reading through this thread viewtopic.php?f=1&t=34491&st=0&sk=t&sd=a&start=30 and it seems my tidal volumes are too low.īackground first: I am in the process of going to National Jewish (go in May) for suspected pulmonary arterial hypertension. ![]() PEEP(total) and PEEP(i) were, respectively, 16.3 +/- 2.9 and 5.8 +/- 3.0 cm H2O during the lower VT strategy and 11.7 +/- 0.9 and 1.4 +/- 1.0 cm H2O during the traditional VT strategy (p < 0.01). PEEP(i) was calculated by subtracting PEEP(external) from PEEP(total). Values of airway pressure at end-expiration of a regular breath (PEEP(external)) and 3-5 seconds after the onset of an end-expiratory occlusion (PEEP(total)) were measured. PEEP on the ventilator (PEEP(nominal): 10.1 +/- 0.7 cm H2O), FIO2 (0.7 +/- 0.1), and minute ventilation (VE: 12.4 +/- 1.7 L/minute) were set using the ARDSNet protocol and maintained constant during the two ventilatory strategies. ![]() Respiratory rate was then reduced (10-15 breaths/minute) to obtain a VT of 12 ml/kg (ARDSNet traditional VT). Ten patients with acute respiratory distress syndrome (ARDS) were ventilated using the ARDSNet lower VT protocol. We tested the hypothesis that the increased respiratory rate used in the ARDSNet lower VT strategy might have led to intrinsic positive end-expiratory pressure (PEEP(i)), raising total PEEP (PEEP(total)). However, three earlier studies that lowered VT did not find a decrease in mortality. The ARDSNet trial revealed that the use of a smaller tidal volume (VT) reduced mortality by 22%.
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