![]() They also show that the increase in pCO 2 can be avoided by even modest increases in total alveolar ventilation (although the calculated dead space will remain elevated). This will increase the calculated physiological dead space accordingly (above that normally present due to the volume of air in the conducting airways). In the previous issue of Critical Care, Niklason and colleagues use computer modeling to point out that blood flowing through unventilated regions of the lung (a shunt) will increase arterial partial pressure of carbon dioxide (pCO 2) if ventilation remains constant. ![]()
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