Covidien Newport HT70, Operator'S Manual

Page: 133 / 148

10-1
10 Explanation of Modes and Controls
10.1
A/CMV Mode
(Assist/Control Mandatory Ventilation)
In A/CMV mode, all breaths are mandatory Volume Control or Pressure Control breaths, deter-
mined by the selection on the touch screen. The RR setting determines the minimum number
of mandatory breaths that are delivered each minute. If the patient does not trigger the venti-
lator, the breaths are time-triggered. If the patient makes a breathing effort that causes airway
pressure or flow to meet the Ptrig or Flow trig setting, the patient can trigger mandatory breaths
in addition to, or in place of, time-triggered (mandatory) breaths. PEEP may be added.
Reference PC on page 10-3 and VC on page 10-3 for descriptions of these breath types.
10.2
SIMV Mode
(Synchronized Intermittent Mandatory Ventilation)
In SIMV mode, the patient receives mandatory Volume Control or Pressure Control breaths (see
A/CMV) that are either time-triggered by the ventilator or flow/pressure-triggered by the
patient. They may also receive spontaneous breaths with or without Pressure Support (PS) in
between mandatory breaths. PEEP/CPAP may be added.
The RR setting determines the number of mandatory breaths that are delivered each minute
(±1 b/min). If the patient does not trigger the ventilator, these breaths are time-triggered at
intervals determined by the RR setting. Patients can trigger mandatory breaths in place of time-
triggered (mandatory) breaths if the effort they generate causes airway pressure or flow to meet
the Ptrig or Flow trig setting.
The first patient trigger in each mandatory breath interval will result in a mandatory breath. A
mandatory breath lockout interval is then activated for the rest of the interval, allowing the
patient to breathe spontaneously with or without Pressure Support (PS) until the beginning of
the next interval. If the patient does not trigger the ventilator for one complete mandatory
breath interval, a time-triggered mandatory breath is delivered at the end of the interval.
Reference PS on page 10-2 , PC on page 10-3 , and VC on page 10-3 for descriptions of these
breath types.