![]() ![]() Ventilation is the movement of air through the respiratory tract into (inspiration) and out of (expiration) the respiratory zone ( lungs). The effect on PaCO2 is less as patient weight increases, but these data suggest it can be significant for typical circuit components up to at least 17 kg or aged 36 months.The main function of the respiratory system is gas exchange (O 2 and CO 2). Increasing apparatus Vd can lead to exponential increases in PaCO2 and/or RR required to maintain normal PaCO2.
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