Vc-Simv - Dräger Oxylog 3000 plus Instructions For Use Manual

VC-SIMV

Volume Controlled – Synchronized Intermittent
Mandatory Ventilation
Paw Unsynchronized
mandatory
ventilation stroke
PEEP
Trigger
Spontaneous
T
i
window
breathing time
Set mandatory
1
cycle time
RR
VC-SIMV provides a combination of mandatory
ventilation and spontaneous breathing. It enables
the patient to breathe spontaneously, with the
mechanical mandatory breaths providing minimum
ventilation. The minimum ventilation is controlled
by the two set values of the tidal volume VT and
respiratory rate RR and is determined from the
product of VT x RR.
The mandatory ventilation pattern results from the
ventilation parameters of the tidal volume VT,
respiratory rate RR, ventilation time ratio I:E or
inspiratory time Ti and plateau time Tplat. To
prevent the mandatory breath from being applied
during spontaneous expiration, the flow trigger of
the ventilator ensures that the breath is triggered in
synchrony with the patient's spontaneous
inspiratory effort within a fixed time window during
expiration.
The trigger window has a duration of 5 seconds. If
the expiratory time is less than 5 seconds, the
trigger window covers the entire expiratory time
minus a minimum expiratory time of 500 ms.
Instructions for use Oxylog 3000 plus SW 1.n
Synchronized
mandatory
ventilation stroke
t
Spontaneous
breathing time + T
Set mandatory
1
cycle time
RR
Since the synchronization of the mandatory breath
reduces the spontaneous breathing time, which
would result in an undesirable increase in
respiratory rate, the Oxylog 3000 plus prolongs the
spontaneous breathing time of the subsequent
breath by the difference T - thus preventing an
increase in SIMV frequency. The respiratory rate
RR remains constant.
The respiratory rate RR and tidal volume VT set the
minimum ventilation –, as in VC-CMV and VC-AC.
During the spontaneous breathing phases, the
patient can be assisted with pressure by Pressure
Support PS.
Generally the number of mandatory breaths is
reduced in the course of weaning the patient off
ventilation. This increases the spontaneous
breathing time, so that the required total minute
volume MV is increasingly supplied by
spontaneous breathing.
Description
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