Hi. I am a respiratory care student in my first year. I know this is a nursing forum but I have found lots of help in the past on this site.
I am confused about inspiratory flow rates. The specific question is this:
Your patient has a Vt of 0.8 L, a reapiratory rate of 12 br/m with an inspiratory time of 1.2 seconds. What is your patient's inspiratory flow rate?
I also have another question too:
You set up a T-piece with an FiO2 of 0.4 using a full E cylinder with oxygen flow meter set at 12 l/m. What is the total flow of the system?
If someone can please help me with these. I am struggling some in this area.
Thank you so much.
Nov 15, '11
These are fundamental, first semester respiratory student calculations. Please, get help and look at tutoring. Do not fall behind and good luck.
As already discussed the inspiratory flow is simply how many ml per second multiplied by 60 and a conversion to liters to get liters per minute. 0.67 L/sec = 40 L/min.
The second question involves air entrainment calculations. It is NOT asking for duration. You can use the magic box formula or do the following:
1) Find your air entrainment ratio:
100-40 = 60, 40-20 = 20 --> 60:20 = 3:1
2) Add the ratio:
3) Take the product of the number above and the flow of oxygen:
4* 12 = 48
48 L/min is the total flow delivered in this situation.
Last edit by GilaRRT on Nov 15, '11
: Reason: 3)