Instructions for Use Evone
42
6.5 Special Functions
During ventilation in FCV
®
and/or Jet Mode the following special functions are available:
6.5.1 Ventilation Pause
The function of the ‘Ventilation Pause’- button (Figure 6.3, number 4) is to set all active FCV
®
ventilation processes on hold. The ‘Ventilation Pause’- button can be accessed from the active
FCV
®
screen. Upon clicking, a pop-up screen will appear, like the one depicted in Figure 6.6.
The user is asked to resume ventilation by clicking on the ‘resume’ button or to wait. In the
screen, the FCV
®
device counts down from 60 seconds to 0 seconds. After this countdown,
ventilation will automatically resume, using the settings identical to the settings just before
the ventilation pause state was entered.
Figure 6.6 Ventilation pause screen
6.5.2 Safety State
The ‘Safety State’ is a state which cannot be chosen by the user, but will appear when the
FCV
®
device has encountered an issue, large enough to restrict the user from using the device
any further. The issue may be due to an irreversible technical defect or an external situation,
leading to an immediate potentially hazardous situations for the patient. When the safety state
becomes active, a pop-up screen will appear. The user has only one option: shut down the
device. If the message occurs during ventilation the user should switch to alternative ventilation.
The device may be restarted to perform a self-check and startup check.
In safety state there is an open connection between the patient’s lungs and ambient air.
6.5.3 Negative End Expiratory Pressure
A negative end expiratory pressure (NEEP) can be set, but is strictly limited to be applied during
hypovolemia/severe hemorrhage and concomitant hemodynamic instability. High intrathoracic
pressures or PEEP levels prevent the return of venous blood to the heart, carrying a risk of
metabolic acidosis. In contrast, lower intrathoracic pressures stimulate venous blood to return to
the heart. In hypovolemic situations, the effects of intrathoracic pressures are more pronounced
than in a normovolemic setting. A NEEP (of - 10 mbar maximally) may be considered during
