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Calculating I:E ratios with Pts on mechanical ventilators? |
I'm trying to review my critical care skills and have forgotten a few things. How are I:E ratios calculated and what's the purpose behind this concept? I can recollect some rationales such as appropriate ABG's and hyperventilating a pt to maintain a lower ICP for those with a bleed and a shift. I'm reviewing respiratory pathophysiology just to keep myself up to date on things. Also, what conditions would CPAP be preferred over PEEP? I:E ratio is just the amount of time in a whole respiratory cycle spent in inspiration vs expiration. So if you've got a respiratory rate of 20 (3 seconds total cycle time) and your I:E ratio is, say, 1, you're spending 1.5 seconds in inspiration and 1.5 seconds in expiration. Generally, increases in the I (inspiratory) time can be use to improve oxygenation. If there's an obstructive process, like asthma, you may need more E time since expiration is more difficult, so you don't stack breaths. CPAP and PEEP are the same, but the terminology is different for different vent modes. You use CPAP when breaths are initiated by the patient, and PEEP for ventilator delivered breaths. |
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