Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ventilation II > PRVC and Auto Adjusting Modes > Flashcards

PRVC and Auto Adjusting Modes Flashcards

1
Q

What is PRVC on a Servo vent?

A

PRVC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is PRVC on a PB vent?

A

VC+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is PRVC on an Evita?

A

CMV or VC with autoflow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is PRVC on a Hamilton vent?

A

APV-CMV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What main advantage does PRVC have over pressure control?

A

The tidal volume can vary greatly in pressure control, but PRVC will target a specific volume without exceeding safe pressures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does the vent decide what pressure to use in PRVC?

A

Most vents deliver one VC breath to determine Pplat, then deliver a PC breath using pressures that are approximately the Pplat - PEEP. It then adjusts based on the Vt achieved.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the advantages of using PRVC?

A
  • lower ventilating pressures
  • breath is more adaptive if patient has drive to breath
  • breath is more comfortable
  • Vt may vary but MV and average Vt are fairly consistent
  • May decrease risk of overdistension
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are some disadvantages of PRVC?

A

If the patient is changing rapidly the machine may struggle to keep up. If the patient is breathing spontaneously it may decrease driving pressure to the point of exhausting the patient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is a PRVC reset?

A

When there are large changes in Vt the mode will reset and deliver a VC breath to try to measure Pplat again. This often happens in bronchospastic or coughing patients and can make things worse.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the PRVC pressure limit?

A

It is a limit automatically set by the machine below the high pressure alarm that will allow the breath to continue instead of just cycling off

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How should we set the pressure alarm in PRVC?

A

Add the amount of the pressure limit to the current PIP and then set the PIP alarm 5 above that.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the pressure limits on the different kinds of vents?

A

PB: 3 cmH2O
Hamilton: 10 cmH2O
Any other vent: 5 cmH2O

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the Mandatory Minute Ventilation mode?

A

As long as the patient’s minute ventilation is higher than what is set, the patient is in PSV. If the patient’s minute ventilation falls below this, they are given control breaths to increase it above the set level.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How do we set the MV in MMV?

A

Set it lower than the current spontaneous level, but high enough to provide at least adequate ventilation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why is MMV not used often?

A

It’s only available on Evita ventilators, the patient defaults to VC which is not comfortable, the patient is able to maintain adequate MV even when tiring out, and the RR will typically elevate as Vt declines.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is PC-PSV?

A

Similar concept to MMV but will default to a pressure support breath if the patient’s RR drops too low.

17
Q

Which vent do you find PC-PSV on?

A

The Evita V500

18
Q

What is a major problem with PC-PSV?

A

We do not know how much effort the patient is making vs. the vent and we do not know what Vt we will see so there is the potential for hypoventilation.

19
Q

What is Automode and which vent do you find it on?

A

Swaps between a spontaneous breath and control breath based off whether patient is triggering the breaths, only found on servo ventilators.

20
Q

Who is automode used for?

A

Patients receiving bolus sedation, waking up from surgery, having apneic spell while sleeping, or those who are already stable on a spontaneous mode

21
Q

What is VSV?

A

Volume support ventilation which is pressure support to target a set Vt, similar to PRVC. It is not really used because it just doesn’t work. PRVC is better

22
Q

What vent is ASV found on?

A

Only Hamiltons

23
Q

What is ASV?

A

An MMV-type mode that swaps between control and spontaneous breaths based on if the patient is breathing.

24
Q

How does ASV work?

A

The vent determines the “ideal” minute ventilation based on the patient’s height and sex. The clinician can then target a specific % of the ideal MV based on an ABG to determine how well the patient is ventilating and the machine will guide the breath to that target.

25
Q

What is Otis’s law?

A

An equation that is designed to calculate the minimal work of breathing as a function of RR and Vt.

26
Q

What parameters does the vent use to target MV in ASV?

A

Driving pressure, RR, and Ti

27
Q

When is the ideal time to use ASV?

A

In a healthy post-operative patient (no lung pathology)

Ventilation II (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions