MTV1000 Ventilator System
50
User’s Manual
EtCO2
mmHg
End tidal carbon dioxide
iCO2
mmHg
Inspiratory carbon dioxide
RESP
RPM
Respiratory through EtCO
2
VI CO
2
Ml
Inspiratory CO
2
Tidal Volume
VE CO
2
Ml
Expiratory CO
2
Tidal Volume
VE MIN CO
2
Ml
Expiratory Minute CO
2
Volume
6.7.1.
E Flow(End of Exhaled flow)
The most important thing in deciding Exhalation time is whether sufficient exhalation has
taken place. If Exhalation time is too short, higher residual pressure called as Self PEEP (or
Auto PEEP) than PEEP pressure remains.
If the flow rate at the end of expiration is zero, then it means that lung pressure is enough
lowered down to PEEP pressure.
It means that the reference lung pressure at the end of exhalation is higher than PEEP. The
cause is short exhalation time.
In mandatory ventilation, if E_flow is not zero, Exhalation time is short and Self PEEP
exists, therefore you must lower the respiratory rate to use it.
On the other hand, if the respiratory rate is increased then you must check that E_flow is
zero after you increase the respiratory rate.
Upper figure : It is sufficient exhalation time and lung pressure is the same as PEEP and
E_flow is zero.
Lower figure : It is insufficient exhalation time and lung pressure is higher than PEEP and
E_flow is not zero.
