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6-15

3. [Cycles Sigh]: Number of sigh cycles

4. [△int.PEEP]: PEEP added in sigh cycle

6.5.7 CPAP/PSV

PSV is pressure support ventilation mode. The system delivers a PSV when it detects that

patient inspiratory effort reaches the preset inspiration trigger level. Time of pressure rising

and pressure support level are set by the user. At the beginning of inspiratory phase, the

patient’s airway pressure rises to the preset pressure level within the preset time of pressure

rising, and is held at this pressure level till patient inspiratory flow is detected to reach the

expiration trigger level. In PSV, when the airway pressure is held at the preset pressure level,

delivered gas flow decelerates, and varies with the resistance and compliance of the patient’s

lungs.

Paw

Flow

Time

Apnea time

△Papnea

Apnea ventilation

Apnea vent

cycle

I:E=1:2

Tslope

△Psupp

PSV

Exp. trigger

Insp. trigger

CPAP is continuous positive airway pressure ventilation mode. The airway pressure is held at

the user-set positive pressure level throughout the ventilation cycle. The patient breathes

spontaneously and determines his own breathing frequency, tidal volume, and breath time.

The system starts apnea ventilation when it detects that the period of time in which patient

does not perform continuous spontaneous breathing exceeds the preset apnea time.

Mindray SV300 User Manual

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