Newport HT50 - Volume Control (Volume Control Ventilation); Back-Up Ventilation

SECTION 4
SERHT50NA A0808 4-5
VOLUME CONTROL
(Volume Control Ventilation)
During Volume Control ventilation, tidal volume can be set for
mandatory breaths. If a volume setting is changed while the
ventilator is operating, the change takes place in increments over
a series of breaths.
When tidal volume is adjusted, inspiratory time remains constant
and V
•
(mandatory flow) changes.
If an attempted tidal volume setting results in a flow rate in excess
of 100 L/min or less than 6 L/min, adjustment ceases and the
user is alerted by an audible beep and the message “Reached
Max V
•
” or “Reached Min V
•
” will appear in the Message Display
Window.
NOTE: Make sure that the mandatory flow (V
•
) setting is adequate
to meet patient flow demands. The flow setting is displayed by
pressing the front panel button labeled V
•
. Mandatory flow is
changed by adjusting t
I
.
BACK-UP VENTILATION
Back-up Ventilation is an alarmed function that activates when the
delivered inspiratory minute volume (V
•
I
) falls below the Low ▼V
•
I
alarm limit setting. During Back-up Ventilation, the Low ▼V
•
I
(Back-
up Vent) alarm indicator blinks, an audible alarm sounds, and
“Low V
•
i (BUV)” is displayed in the Message Display Window. The
ventilation settings employed by Back-up Ventilation are displayed
on the front panel.
Back-up Ventilation is functional in all modes.
NOTE: Back-up Ventilation is not active for 60 seconds after the
user adjusts any ventilator controls, changes modes or turns the
v
entilator On from the Setting condition.
NOTE: During Back-up Ventilation, the Silence/Reset button can
be pressed to silence the audib
le alarm. This will not cancel Back-
up Ventilation.
NOTE: Back-up Ventilation in the HT50 is based on the delivered
inspir
atory minute volume. The inspiratory minute volume may be
different from the expiratory minute volume in some conditions,
such as in the case of a patient breathing circuit or patient airway
leak.