Heyer iTernIS ADV, Operator'S Manual

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Menu | iTernIS ADV
7. 10
During the initial calibration (see the
Start-up and initial calibration
chapter) the ven-
tilator calculates the compliance of the patient circuit and uses that information to
determine tidal volume compensation. Based on this determination, the ventilator
estimates the volume to be added (volume modes) or subtracted (pressure modes).
The Volume
Compensation
option is active by default (YES option). In this case, a
message appears in the Icosn and messages bar, warning that the compensation
is active. To deactivate the volume compensation, select the NO option on the
appropriate
VENTILATORY ADJUNCTS
line.
WARNING
• If the patient circuit configuration is chan -
ged (hoses, humidifier, etc. being changed
or added) the volume compensation prior
to the change will no longer be valid. The
circuit will have to be calibrated again to
re-calculate the new compensation value.
Otherwise, the patient may receive and ex -
hale a volume that will not be reflected in the
values displayed on the screen.
This is an option used if the kind of humidification used during ventilation is changed.
When the humidification system is changed, the temperature and humidity condi -
tion of the gases are changed. Because of this, the volumes delivered and moni-
tored at BTPS condition must be corrected (body temperature, steam-saturated
ambient pressure).
The humidification system options are:
• ACTIVE: this is the option that must be configured when an active humidifier/
heater is used. In this case, flow and volume readings are corrected to take into
account the humidity and temperature generated by this kind of humidifier.
• PASSIVE: this is the option that must be configured if a passive humidifier is used
(heat and moisture exchanger - HME).
• NONE (TECHNICAL): this is an option used by technical services. It is intended to be
selected when no humidification is used and, therefore, no volume reading correc -
tions are done. It must not be used while a patient is being provided ventilation.
WARNING
• Selecting the NONE (TECHNICAL) option
implies disabling the BTPS correction. The -
refore, it should never be used while a pa -
tient is being provided ventilation.
Auto-triggering may occur when there is a leak in the circuit because the leak could
be interpreted as flow that has been diverted by patient requirements. Similarly,
the ventilator may consider the depressurization generated by the loss of gases a
result of the patient’s inspiratory effort if it is working with sensitivity by pressure.
The purpose of leak compensation is to stabilize triggering sensitivity to avoid auto-
triggering occurrences. If there is a leak, it is measured by the ventilator and used
as a point of reference to establish triggering criteria (inspiratory sensitivity).
The compensation operates up to certain leak levels (see Table 7-3).
7.4.5 | Humidifier
7.4.6 | Leak compensation