Newport HT50 - SIMV Mode (Synchronized Intermittent Mandatory Ventilation); SPONT Mode (Spontaneous Ventilation)

SIMV MODE
(Synchronized Intermittent Mandatory Ventilation)
In SIMV mode, patients receive a fixed number of volume or
pressure controlled mandatory breaths (time or patient activated)
and may breathe spontaneously between mandatory breaths, with
or without pressure support (Psupport). See Figure 4-1 for
schematic illustration. PEEP/CPAP may be added.
The first patient triggered breath in any mandatory breath interval
will be a patient triggered mandatory breath. The patient has the
rest of the interval to breathe spontaneously. If the patient does
not trigger the ventilator, and one complete mandatory breath
interval has elapsed, a time triggered mandatory breath is
delivered.
A mandatory breath lockout interval is activated whenever the
patient triggers a mandatory breath. This limits the number of
mandatory breaths (time triggered or patient triggered) the patient
receives in 60 seconds to the
ƒ (b/min) setting.
As with all HT50 operating modes, Back-up Ventilation is activated
if the Low ▼V
•
I
alarm limit is violated.
SPONT MODE
(Spontaneous Ventilation)
In SPONT mode, mandatory breaths are not delivered but the
user can adjust both PEEP/CPAP and pressure support
(Psupport) levels. The patient has control over each breath.
SECTION 4
SERHT50NA A0808 4-3
Figure 4-1
Synchronized Intermittent Mandatory Ventilation (SIMV)
TIME TRIGGERED
MANDATORY BREATH
PATIENT TRIGGERED
MANDATORY BREATH
SPONTANEOUS BREATH
PRESSURE
100%
A
B
C
C
A
A
MANDATORY BREATH
INTERVAL
MANDATORY BREATH
INTERVAL
MANDATORY
BREATH
LOCKOUT
INTERVAL
A: Time Triggered Mandatory Breath
B: Patient Triggered Mandatory Breath
C: Spontaneous Breath
---: "Scheduled" Mandatory Breath not delivered because of the patient triggered mandatory
breath in the last interval