8- Ventilation; Ventilation Modes - Saadat Respina P1 User Manual

8- Ventilation

8-1

Ventilation modes

The Respina P1ventilator provides the following ventilation modes:
VCV, V-SIMV, PCV, P-SIMV, PRVC-CMV, PRVC-SIMV, VSV, PSV, APRV

VCV (Volume Controlled Ventilation)
During this mode the ventilator delivers the set tidal volume to the patient in inspiration
phase. This mode is a volume-controlled mode. The user sets tidal volume, Inspiratory time
(Ti) and respiratory rate. Peak flow (Flow), expiratory time (Te) and Ratio of inspiratory time
to expiratory time (I:E) are calculated automatically based on the adjusted parameters by
user.
A higher inspiratory time will decrease peak flow (at a specific tidal volume) and a lower
tidal volume will result in shorter peak flow (at a specific inspiratory time). High values of
tidal volume or low Ti could result in excessive pressure in the patient breathing circuit.
Excessive increasing in pressure or volume could terminate inhalation. In this situation set
tidal volume may not deliver to the patient and corresponding alarm be activated. As the
pressure approaches the pressure alarm (active pressure), the exhalation valve opens and
prevents further increase in pressure. If this happens in a few breathing cycles, the alarm for
not delivering the user's adjusted volume will be activated (see the alarms chapter).
The flow Pttern sets by the user. Two square and decelerating (Decel.) flow patterns are
selectable in this ventilator.
The time which neither air is delivered to the patient nor exhaled from the patient's lung
through the airway defin as a Pause. This parameter is adjustable as a percentage of
inspiratory time between 0 and 75%.
In this mode the patient could synchronize a mandatory breath with respiratory effort. In
specific times the device indicates sensitivity to the patient effort and allows synchronization
of mandatory breath. The device sensitivity to the patient respiratory effort is shown in the
trigger window. This window begins from 350 ms after the start of exhalation (Min
exhalation) until the start of the next cycle.
The curve of flow versus time is shown in the below figure. The red part of the curve is
related to inspiration phase and the blue part is related to the exhalation phase.
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