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Flashcards in Ventilator settings Deck (11)
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1
Q
What do these modes of ventilation stand for?
A/C
CMV
PSV
PCV
SIMV
VCV
A

A/C - Assist control
CMV - Controlled mechanical ventilation or continuous mandatory ventilation
PSV - Pressure support ventilation
PCV - Pressure control ventilation
SIMV - Synchronized intermittent mandatory ventilation
VCV - Volume controlled ventilation

2
Q

When considering volume -targeted modes, explain volume constant.

A

Guarantees volume at expense of letting airway

pressure vary

3
Q

When considering volume -targeted modes, explain when inspiration terminates.

A

Terminates when preset Vt delivered

4
Q

When considering volume -targeted modes, explain what would inhibit the preset Vt from being delivered?

A

a specified pressure limit is exceeded (upper airway pressure alarm is set) or patient’s cuff or ventilator tubing has air leaks that cause a decrease in Vt
delivered

5
Q

When considering volume -targeted modes, explain peak airway pressure.

A

Variable; determined by changes in airway
resistance, lung compliance, or extrapulmonary factors. The peak airway pressure increases as needed to deliver prescribed Vt

6
Q

When considering volume -targeted modes, explain inspiratory flow rate.

A

Fixed; if patient inspires faster or more vigorously, work of breathing increases; clinician needs to promptly correct airway resistance and/or lung compliance problems, readjust flow-rate setting higher to match inspiratory demands

7
Q

When considering pressure-targeted modes, explain volume variable

A

Guarantees pressure at expense of letting Vt vary

8
Q

When considering pressure-targeted modes, explain when Inspiration terminates

A

Terminates when preset pressure reached

9
Q

When considering pressure-targeted modes, explain the preset pressure delivered

A

Volume is variable and determined by

set pressure level, airway resistance, and lung compliance factors, specified time or flow cycling criteria

10
Q

When considering pressure-targeted modes, explain peak airway pressures

A

Fixed; determined by set pressure level; volume delivered is variable and decreases with increased airway resistance, decreased lung compliance, or extrapulmonary factors

11
Q

When considering pressure-targeted modes, explain inspiratory flow rate

A

Variable; if patient inspires faster or more vigorously, variable flow rate may match change in inspiratory
demand or may be insufficient; clinician needs to promptly correct airway resistance and/or lung compliance problems, may need to readjust pressure support, inspiratory, expiratory time settings