Physiological dead space (PaCO2 PECO2)/PaCO2. Apparatus Dead Space: It is the volume of the breathing system from the patient-end to the point up to which, to and fro movement of expired gas takes place. The causes of true dead space are (a) anatomical dead space and (b) alveolar dead space. Dilution of the inspired anaesthetic gases by ventilator driving gas may occur in paediatric practice if the VCD volume (length) is inadequate. Dead space represents the volume of ventilated air that does not participate in gas exchange. No dilution occurred using the neonatal model. In part two, changes in CO 2 partial pressure (PaCO 2) during prolonged periods of circuit flushing and ASPIDS were studied at RR 20, 40 and 60 minutes -1. 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. If a respiratory acidosis persists even after increasing alveolar ventilation, consider the possibility of increased dead space Pulmonary embolism. Proximal dead space in a y-piece and ventilator tubing (VD aw, prox) was measured.
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. 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.
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