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P f ratio 100 0 2 500.
Fio2 room air ค อ. So room air administered o2 fio2. The fio2 coming from a portable oxygen concentrator can vary anywhere from 90 96 fio2. Different devices deliver to the patient more or less of a of what is coming in from the tank. Of room air plus the oxygen from the supplemental device.
We can never accurately know what the fio 2 of a patient is unless we accurately know what their peak inspiratory flow is or we are delivering high flow oxygen at a. Up to 1 00 which means 100 oxygen. If you are breathing in normally at a peak inspiratory flow rate of 30 l min at room air with an fio2 of 21 you can easily calculate the average fio2 you are breathing in an almost redundant formula. The natural air we breathe contains 21 oxygen 21 fio2 and 79 nitrogen at all times with some trace gases.
Oxygen enriched air has a higher fio 2 than 0 21. Now we have a simple face mask. These masks cover the patients nose and mouth and offer fio2 rates from 40 60 at 1 6 l min. The only thing that has changed was the patient s inspiratory flow demand and how much that diluted the pure oxygen being delivered with the fio 2 of 21 found in room air.
97 p a o 2 100 mmhg tissue requires at least 10 mmhg at mitochondria venous blood p v o 2 40 mmhg o 2 content of expired air 16 3. Fraction of inspired oxygen fio2 for all supplemental oxygen delivery devices the patient is not just breathing the direct oxygen but rather is breathing a. Hospital grade oxygen found in a medical facility can reach 99 fio2. Everybody breathing 100 oxygen via nrb will have an pao2 500.
30 x 21 630 630 30 21. So now you can figure out the max pao2 on any fio2. Impair pulmonary gas exchange ค อม ความผ ดปกต ในการแลกเปล ยนแก สของปอด ซ งม กลไกต างๆได แก o hypoventilation o diffusion defect o v q abnormality o shunt hypoxemia. Fio2 fraction of inspired oxygen o 2 content of air 20 93 po 2 160 mmhg alveolar air 14 2 p a o 2 104 mmhg arterial blood sat.
Everybody breathing room air 21 will have an pao2 100. Now consider you are receiving 10 l min of oxygen via a face mask at an fio2 of 100. Fio2 aka the amount of air they are actually getting. Fio2 p f ratio pao2.
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