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Dr. Ajith Kumar J MD
Dept. of Emergency Medicne
Travancore Medicity, Kollam
India
editor
Volume Control Ventilation (VCV)
In this mode the tidal volume is preset.
Breaths are either controlled (machine) or assist controlled (Breath is initiated by patient/machine), depending on the presence or absence of spontaneous inspiratory activity or depends on whether the inspiratory trigger is active.
When inspiratory trigger is active Volume control Ventilation is known as Assist Control Ventilation (ACV).
The peak pressure can vary from breath to breath depending on the patient compliance and resistance.
The ventilator switches to exhalation or time cycles based on the set inspiratory time (Ti).
Settings
Tidal Volume
RR
I:E Ratio
PEEP
FiO2
PCV v/s VCV
Although one can set volume control and pressure control modes to deliver exactly the same tidal volume, the effects of these two approaches are very different when the patient's respiratory mechanics or respiratory muscle activity change.
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Pressure waveform : In Volume modes the shape of the pressure wave will be a ramp for mandatory breaths.
Flow waveform : In volume modes, the shape of flow wave will be square. This means that flow remains constant or flowrate is a set parameter.
Volume waveform: Generally have a “mountain peak” appearance at the top. It may also have a plateau, or “flattened” area at the peak of the waveform.
emmedonline
Dr. Ajith Kumar J MD
Dept. of Emergency Medicne
Travancore Medicity, Kollam
India
editor