Table of Contents
Advertisement
Avance
SIMV/PSV mode
11-20
Synchronized Intermittent Mandatory Ventilation/Pressure Support 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 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 it synchronously delivers a volume breath
using the set tidal volume, and inspiratory time that is set on the
ventilator. If the patient fails to make an 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/PSV, the spontaneous breaths can be pressure supported to
assist the patient in overcoming the resistance of the patient circuit
and the 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/PSV mode settings:
•
TV
•
RR
•
Tinsp
•
Tpause
•
Psupport
•
PEEP
•
Pmax
•
Trig Window
•
Flow Trigger
•
End of Breath
•
Rise Rate
3
4
5
1. Mandatory SIMV breath
2. Spontaneous pressure supported breath
3. Paw
4. Psupport
5. PEEP
6. Time
Figure 11-3 • SIMV/PSV diagram
6
M1204616
Advertisement
Table of Contents
