![]() shallow breaths vs deep breathsĮxtra volume that can be inspired above tidal volume, from normal quiet inspiration to maximum inspiration => anatomical dead space increases by 20mL for each L of lung volumeĮ.g.Volume that enters and leaves with each breath, from normal quiet inspiration to normal quiet expirationĬhanges with pattern of breathing e.g. ![]() => at infancy, anatomical dead space is higher for body weight (3.3mL/kg) => modified: V D/V T = (P aCO2 - P ECO2)/P aCO2Īdditional notes Factors influencing anatomical dead space NB: P ECO2 is the partial pressure in MIXED expired gas, NOT end-tidal gasĮnghoff modification - using measured arterial PaCO2 as an estimate of the ideal alveolar PACO2
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