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Is alveolar dead space the same as physiological dead space? The anatomical dead space is the total volume of the conducting airways from the nose or mouth to the terminal bronchioles, and in ventilated infants includes the apparatus dead space (endotracheal tube and flow sensor). The physiological dead space is the anatomical dead space plus alveolar dead space. … In healthy lungs where the alveolar dead space is small, Fowler’s method accurately measures the anatomic dead space by a nitrogen washout technique. Anatomical dead space is that portion of the airways (such as the mouth and trachea to the bronchioles) which conducts gas to the alveoli.