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VSV (Volume Support Ventilation)
This mode is a spontaneous breath mode and patient effort determines respiratory rate. In this
mode the user sets tidal volume. When the patient makes an effort, the ventilator delivers
pressure supported breath to achieve the set tidal volume. Low pressure limit is equal to
PEEP + 3 cmH2O and high pressure limit is equal to Pmax –5 cmH2O (Pmax is high
pressure limit).
If upper or lower limit of pressure is reached and target volume is not delivered to the patient,
the message "Volume not Delivered" will be displayed (see the alarms chapter).
Excessive increase of pressure or deliverd volume could cause terminating the inhalation.
When the operator adjusts the parameters of a respiratory mode, he/ she is faced with
limitations in setting the upper and lower limits of these parameters, which are due to the
adjustment of other respiratory parameters.
Note:
During inhalation, if the airway pressure for any reason (such as the patient's cough) exceeds
the value specified for it, the exhalation valve opens and prevents further increase in pressure.
The below parameters could be set in this mode:
Parameter
O
2
V
t
PEEP
Trigger
F Trig/ P Trig
% Esens
Rise Time
PSV (Pressure Support Ventilation)
This mode like VS mode is a spontaneous breath mode, except that the ventilator delivers
pressure supported breaths in response to the patient effort.
If the user sets Psupport to 0 cmH2O, a pressure equal to PEEP is maintained during
inspiration that in this condition the mode is Continuous Positive Airway Pressure.
Excessive increase of pressure or deliverd volume could cause terminating the inhalation (se
the alarms chapter).
Percentage of delivered oxygen to the patient
Target tidal volume delivered per breath
Positive end expiratory pressure
The method of detecting the patient's respiratory effort (flow or pressure).
Threshold of detecting patient respiratory effort based on flow or pressure
Percentage of peak inspiratory flow in spontaneous breath necessary to
inhalation
terminate
and initiate exhalation.
Time required for inspiratory pressure to rise to set pressure
Definition
79
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