Author Question: Mean airway pressure can be increased when ventilating with the Bunnell Life Pulse High-Frequency ... (Read 158 times)

storky111 · **on:** Jul 16, 2018

Mean airway pressure can be increased when ventilating with the Bunnell Life Pulse High-Frequency Jet Ventilator by doing which of the following?

a. Closing off the purge valve
b. Decreasing the rate on the Bunnell
c. Decreasing the positive end-expiratory pressure on the Bunnell
d. Increasing rate and volume of sigh breaths on the conventional ventilator

Question 2

Which of the following statements concerning the volume guarantee mode on the Drger Baby-log 8000 ventilator is true?

a. The breaths are volume-limited in this mode.
b. This mode does not operate with as-sist/control.
c. The Drger Babylog 8000 and 8000+ both have this mode.
d. Positional endotracheal tube leaks may be hazardous with this mode.

kbennett34 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: D
The function of the purge valve is to provide a moisture-free environment in the monitoring line of the hi-lo jet tube. Decreasing the rate decreases the mean airway pressure because less time is spent at the inspiratory pressure. Decreasing the positive end-expiratory pressure level decreases the mean airway pressure. Increasing the rate and volume of the sigh breaths increases the mean airway pressure.

Answer to Question 2

ANS: D
When the volume guarantee mode is activated, the ventilator continuously measures and com-pares inspired and expired tidal volume. Each following breath uses the comparisons from the previous breath to make adjustments to the peak inspiratory pressure so that a volume as close as possible to the preset value can be delivered. If there is a positional leak and it is active, the ex-pired tidal volume will be lower than the inspired tidal volume, and the ventilator will increase the pressure to attempt to match the two monitored volumes. This increase in pressure continues if the leak continues. However, if the patient's position changes and the leak is not occurring, the breath delivered will be significantly larger than intended. The limit to the amount of volume is 130 of the targeted volume. At this point, the exhalation valve will open, and no additional ventilator-driven gas will be delivered to the patient. Close monitoring of patient-ventilator in-teraction is needed during use of this mode.