Author Question: The flow sheet below, for a patient on pressure-controlled continuous mandatory ventilation ... (Read 164 times)

karen · **on:** Jul 16, 2018

The flow sheet below, for a patient on pressure-controlled continuous mandatory ventilation (PC-CMV), demonstrates which of the following?

Time PIP (cm H2O) PEEP (cm H2O) Exhaled VT (mL)
0800 28 8 575
1000 28 8 558
1200 28 8 500

a. Lung compliance is increasing.
b. Dynamic compliance is decreasing.
c. Airway resistance is decreasing.
d. There is a leak in the ventilator circuit.

Question 2

How can the amount of cuff volume/pressure lost in the connecting tube be minimized during cuff measurement using a three-way stopcock, a manometer, and a syringe?

a. Using a four-way stopcock
b. Overinflating the cuff prior to measure-ment
c. Simultaneously inflating the cuff and ma-nometer
d. Pressurizing the manometer to 25 mm Hg prior to use

bobsmith · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
During pressure-controlled continuous mandatory ventilation (PC-CMV), a decrease in volume delivered is characteristic in a decreased dynamic compliance. If lung compliance increased or airway resistance decreased, the exhaled tidal volume would have increased. A leak in the venti-lator circuit would also drop the peak inspiratory pressure (PIP).

Answer to Question 2

ANS: D
Pressurizing the manometer to 25 mm Hg before measuring the cuff pressure will ensure that the pressure/volume in the cuff will not be lost into the connecting tubing. Once pressurized, the three-way stopcock, syringe, and manometer system can be inserted into the pilot. With all three ways open, the cuff can be inflated or deflated while the pressure is being measured.