• Resp Care · Mar 2001

    Case Reports

    Patient-ventilator interactions during volume-support ventilation: asynchrony and tidal volume instability--a report of three cases.

    • T M Sottiaux.
    • Intensive Care Unit, Clinique Notre Dame de Grâce, 212, Chaussée de Nivelles, 6041 Gosselies, Belgium. thierry.sottiaux@skynet.be
    • Resp Care. 2001 Mar 1;46(3):255-62.

    AbstractDuring pressure-support ventilation, tidal volume (V(T)) can vary according to the level of the patient's respiratory effort and modifications of the thoraco-pulmonary mechanics. To keep V(T) as constant as possible, the Siemens Servo 300 ventilator proposes an original modification of pressure-support ventilation, called volume-support ventilation (VSV). VSV is a pressure-limited mode of ventilation that uses V(T) as a feedback control: the pressure support level is continuously adjusted to deliver a preset V(T). Thus, the ventilator adapts the inspiratory pressure level, breath by breath, to changes in the patient's inspiratory effort and the mechanical thoraco-pulmonary properties. The clinician sets V(T) and respiratory frequency, and the ventilator calculates a preset minute volume. It has been shown that ineffective respiratory efforts can occur during pressure-support ventilation.

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