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Schematic illustration of a generic inert gas washout system. Hardware required for washout is relatively simple: a flow meter, a fast-responding inert gas analyser, a gas delivery system, and a patient interface. The equipment-related deadspace volume (VD) can be divided into pre- and post-gas sampling points. Post-gas sampling point VD effectively introduces a small rebreathing chamber. Pre-gas sampling point VD is an extension of anatomical VD. Reproduced from [10] with permission.
