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Related to anatomical dead space: alveolar dead space
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In our study, we believe that neither alterations in respiratory physiology nor the minimal changes in anatomical dead space appear to contribute to expedited liberation from mechanical ventilation.
Usually, these tidal volumes end up being less than the patient's anatomical dead space, which is especially important if the patient being ventilated has non-compliant or stiff lungs, in which case conventional mechanical ventilation is likely to cause barotrauma due to overdistension.
Phase I consists of 100% oxygen returning from the larynx and pharynx and trachea and larger airways or anatomical dead space.