Mechanical Ventilation Flashcards

1
Q

What is volume pre-set assist control ventilation?

A

A mode in which the operator sets a tidal volume and a minimum ventilatory rate, where both the patient and the ventilator are able to initiate breaths.

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2
Q

What are the advantages of volume pre-set assist control ventilation?

A

Simple to set
Guaranteed minute ventilation
Rests muscles of respiration

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3
Q

What are the disadvantages of volume pre-set assist control ventilation?

A

Not synchronised with patient’s breathing

Inappropriate triggering (e.g. as a result of hiccoughs) can result in excessive minute ventilation

Fall in lung compliance results in high alveolar pressure and barotrauma

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4
Q

What is pressure pre-set assist control ventilation?

A

A constant pressure is applied during inspiration.

This results in a high initial flow until the pressure is reached, at which point the flow slows and stops.

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5
Q

What is the advantage of pressure pre-set assist control ventilation?

A

Oxygenation may be better due to the flow pattern (initial high rate of flow)

Avoids high inspiratory pressures.

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6
Q

What are the disadvantages of pressure pre-set assist control ventilation?

A

Not synchronised with the patient’s breathing.

Inappropriate triggering (e.g. due to hiccoughs) can result in excessive minute ventilation.

Change in lung compliance can result in a change in tidal volume.

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