![]() Dilution of the inspired anaesthetic gases by ventilator driving gas may occur in paediatric practice if the VCD volume (length) is inadequate. No dilution occurred using the neonatal model. Dilution of inspired gas by the ventilator driving gas was first detected during ventilation of infant and child lung models when the VCD was 7 ml (6 cm) and 77 ml (102 cm), respectively, using Portex tubing, and 24 ml (6.5 cm) and 105 ml (29 cm), respectively, using Intersurgical tubing. Various lengths of two VCD tubing materials were interposed between a T-piece circuit and Nuffield 200 ventilator (Penlon, Abingdon, Oxon, UK) with a Newton valve attached. Circuit tubing The ventilator circuit tubing is generally corrugated plastic (22 mm inside diameter for adults), which has universal connectors (22 mm outside diameter, 15 mm inside diameter) that connect the ventilator to the endotracheal tube (ETT), tracheostomy tube, or noninvasive interface ( figure 1 ). It would be interesting to know more about the type of circuits used in the patients in this study, and the instrumental dead space after the Y-piece in these patients. ![]() A laboratory study was conducted to investigate the volume (length) of the ventilator circuit dead space (VCD) tubing at which dilution of an inspired gas by ventilator driving gas first occurs using three lung models. The volume of dead space includes the instrumental dead space, the anatomical dead space, and the alveolar dead space.
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