Ventway Sparrow User Manual
Page 87 of 144
15. VENTILATION METHODS
15.1. SIMV-VC (PS) FLOW CHART
In SIMV-VC, the patient is supplied with the set tidal volume VT during the
mandatory breaths. The mandatory breaths are synchronized with the
patient’s own breathing attempts. Mandatory breaths are prevented from
being applied during spontaneous expiration, by providing that a patient-
triggered mandatory breath can only be triggered within a trigger window.
If the expiration phase (and with it the spontaneous breathing time) is
shortened on account of synchronization, the next expiration phase will be
extended. This adaptation prevents a change in the number of mandatory
breaths. If no independent breathing attempt is detected during the trigger
window, the machine-triggered mandatory breaths are applied. Thus, the
minute volume MV remains constant over time. If the breathing attempts
of the patient are insufficient to trigger the mandatory breath, the
machine-triggered mandatory breaths are applied. The patient can breathe
spontaneously at PEEP level during the expiration phase. During spon-
taneous breathing at PEEP level, the patient can be pressure-supported
using PS.
Please note:
1. The number of breaths is set by the patient weight (more weight = less
breaths/minute). BPM=mandatory breaths.
2. It is volume controlled (although pressure is constantly being mon-
itored).
3. Either the machine or patient can trigger the breath.
4. If the patient reaches the set trigger sensitivity within a predefined
time, then the trigger breath is initiated.
5. Trigger activation window: occurs after the peep is reached for a
predefined amount of time and is active for a predefined length of
time.
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