B-6 624074/07
B Modes of ventilation
Figure B-1. (S)CMV control window
B.2.2 Pressure-controlled CMV (P-CMV) mode
The P-CMV mode provides pressure-controlled mandatory
breaths only. The control settings active in the P-CMV mode
are shown in Figure B-2. The pressure control (Pcontrol) setting
defines the applied pressure. The rate and breath timing
settings (see Appendix J.4.1) define the breath cycle timing.
Breaths can be triggered by the ventilator, patient, or operator.
In this mode, the operator sets the Pcontrol and the Rate and
other breath timing controls, and the pressure rise time
(P-ramp). As in all other modes, the operator also sets the
PEEP/CPAP and Oxygen controls, and the pressure or flow
trigger when required.
The P-CMV mode, while delivering a preset pressure, does not
guarantee delivery of a fixed tidal volume, especially during
changes in respiratory system compliance, airway resistance,
AutoPEEP, or the patient’s respiratory activity.
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