3. Texp
4.
Variable pressure to deliver desired TV
5. PEEP
6. Flow waveform
7. TV
Figure 11-5 • PCV-VG waveforms
SIMV VCV mode
Synchronized intermittent mandatory ventilation with volume control
is a mode in which periodic volume breaths are delivered to the
patient at preset intervals (time-triggered). Between the machine
delivered breaths, the patient can breathe spontaneously at the rate,
tidal volume, and timing that the patient desires.
At the specified time interval, the ventilator will not wait for the next
inspiratory effort from the patient. The sensitivity of this effort is
adjusted using the flow trigger level. When the ventilator senses the
beginning of inspiration within the Trigger window it synchronously
delivers a volume breath using the set tidal volume, and the
inspiratory time (Tinsp) that is set on the ventilator. If the patient fails
to make and inspiratory effort during the trigger window time interval,
the ventilator will deliver a machine breath to the patient. The
ventilator will always deliver the specific number of breaths per
minute that the clinician has set.
In SIMV VCV, the spontaneous breaths can be pressure supported
to assist the patient in overcoming the resistance of the patient circuit
and artificial airway. When the Psupport level is set, the ventilator will
deliver the pressure support level to the patient during inspiration.
PEEP can also be used in combination with this mode.
Spontaneous breaths that occur during this mode are indicated by a
color change in the waveform.
SIMV VCV mode settings:
• TV
• RR
• Tinsp
• Tpause
• Psupport
• PEEP
• Pmax
• Trig Window
• Flow Trigger
• End of Breath
• Rise Rate
Aisys CS²
11-28 2067226-001
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