Question

#2 RESP 104 2020
Name ____________________________________________________ score____________
Directions: please answer the following questions;
Explain auto-triggering:
At which pressure would it be easier for the patient to initiate a breath?
0
-1
-2
-5
Your vent patient is on a vent, the PIP = 22, 3 cm of PEEP, FIO2= .4, RR-14, what is the baseline pressure?
0
3
5
14
Your patient has very stiff lungs and adult respiratory distress syndrome (ARDS) which mode of ventilation is best for this patient?
VC or AC
Pressure
If tube  compressibility of 2 mL of gas lost for each 1 cm H2O, and the patient PIP = 22 cm, and their tidal volume = 400 ml. How much gas volume is lost in vent tube?
12 mL
36 mL
44 mL
Cannot determine
If PIP is 27 cm H2O, high pressure alarm should place at ___________.
22
25
27
42
Define Limit variable:
Besides using inspiratory hold for calculating static compliance it can also be used for?
If a patient using pressure ventilation compliance gets worse (lungs are stiffer) what happens to tidal volume?
With volume-control ventilation high pressures produce __________ PIP and _______ plateau pressures?

Answer 1

Auto triggering mechanism refers to the mechanism by which the ventilator senses the inspiratory effort and delivers mechanical ventilation in concert with the inspiratory effort of the patient.

Patient can initiate breath at -1 cm of H₂O.

the baseline pressure is 3cm of H2O.

As the patient has ARDS, he has to be on pressure mode

44 ml of gas will be lost in the vent tube. it is calculated by multiplying the Pressure with the compressibility

If PIP is 27cm , high pressure alarm should be kept at 27

“limit variable” refers to the inspiratory phase. during inspiration, the ventilator won’t let that parameters (flow, volume, pressure, etc) get beyond its limit value. That is not to say that those parameters are completely ignored during the other phases: there are still limits in place but they fall into the territory of safety parameters.

The inspiratory pause/inspiratory hold can be used to determine the plateau pressure.

If a patient using pressure ventilation compliance gets worse (lungs are stiffer) the tidal volume decreases.

With volume-control ventilation high pressures produce high PIP and low plateau pressures