Page 2457 - Saunders Comprehensive Review For NCLEX-RN

available at the bedside for all clients receiving
mechanical ventilation.
8. Controlled
a. The client receives a set tidal volume at
a set rate.
b. Used for clients who cannot initiate
respiratory effort
c. Least used mode; if the client attempts
to initiate a breath, the ventilator locks
out the client’s inspiratory effort.
9. Assist-control
a. Tidal volume and ventilatory rate are
preset on the ventilator.
b. The ventilator takes over the work of
breathing for the client.
c. The ventilator is programmed to
respond to the client’s inspiratory
effort if the client does initiate a breath.
d. The ventilator delivers the preset tidal
volume when the client initiates a
breath while allowing the client to
control the rate of breathing.

e. If the client’s spontaneous

ventilatory rate increases, the
ventilator continues to deliver a preset
tidal volume with each breath, which
may cause hyperventilation and
respiratory alkalosis.
10. SIMV
a. Similar to assist-control ventilation in
that the tidal volume and ventilatory
rate are preset on the ventilator
b. Allows the client to breathe
spontaneously at her or his own rate
and tidal volume between the
ventilator breaths
c. Can be used as a primary ventilatory
mode or as a weaning mode
d. When SIMV is used as a weaning
mode, the number of SIMV breaths is
decreased gradually, and the client
gradually resumes spontaneous
breathing.

11. Ventilator controls and settings (Table 69-11)

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