... dead space • Circuit Flushing and Aspiration of dead space are safe and efficient techniques to reduce tubing dead space, re-breathing of CO2 and, PaCO2 Abbreviations ASPIDS: aspiration of dead space; ... bellow of the ventilator to the inspiratory line, Figure Aspiration and/ or Circuit Flushing were performed over the last 30% of expiration time Flow rate and volume for Aspiration and Circuit Flushing ... respiratory distress syndrome Crit Care 2007, 11:R36 doi: 10.1186/cc8986 Cite this article as: De Robertis et al., Re-inspiration of CO2 from ventilator circuit: effects of circuit flushing and...