DESCRIPTION OF CONTROLS, INDICATORS, ALARMS & CONNECTIONS
3-6 SERHT50NA A0808
If the HT50 is in Setting condition, changes are made by pressing
the requested MODE button once. If in ON condition, changes are
made by pressing the requested MODE button twice. After the
first press, the Message Display Window reads “PRESS AGAIN”
and the requested MODE’s indicator starts to blink. If the
requested MODE button is not pressed within 5 seconds, the
change is cancelled.
A/CMV
(Assist / Control Mandatory Ventilation)
In A/CMV, the user may choose to pressure or volume control
mandatory breaths. In either case, all breaths delivered to the patient,
whether time (ventilator initiated) or patient-triggered, are the same.
The ƒ (frequency) setting determines the minimum number of
time-triggered mandatory breaths delivered each minute. The
Ptrig setting determines the airway pressure threshold that patient
effort must reach to trigger additional mandatory breaths. If
patient effort doesn’t cause airway pressure to drop enough to
meet the Ptrig threshold, or if the patient doesn’t breathe, the
HT50 will deliver the set ƒ (frequency) of mandatory breaths.
NOTE: If the Ptrig setting is not adjusted to a level that allows the
patient’s inspir
atory effort to be detected, A/CMV mode performs
as CMV (control) mode.
SIMV
(Synchronized Intermittent Mandatory Ventilation)
In SIMV, the user may choose to pressure or volume control
mandatory breaths. In either case, all mandatory breaths
delivered to the patient, whether time (ventilator initiated) or
patient-triggered, are the same. In addition, the user may choose
to pressure support the spontaneous breaths in between
mandatory breaths.
Unlike A/CMV, the ƒ (frequency) setting in this mode determines
the total rather than the minimum number of time (ventilator) or
patient triggered mandatory breaths delivered each minute.
The ƒ (frequency) setting also establishes a timing window which
determines whether a patient trigger results in a mandatory
breath or a spontaneous breath.
The Ptrig setting determines the airway pressure threshold that
patient effort must reach to trigger mandatory breaths and also to
trigger spontaneous breaths in between mandatory breaths.
If patient effort doesn’t cause airway pressure to drop enough to
meet the Ptrig threshold or if the patient doesn’t breathe, the
HT50 will deliver the set ƒ (frequency) of mandatory breaths each
minute.
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