![]() Based upon the fact that all CO2 comes from alveolar gas and the exhalation of CO2 can therefore be used to measure gas exchange or lack of gas exchange if there is alveolar dead space (no perfusion of these alveoli). Some apparatus dead space may actually reduce total dead space, as an ETT bypasses the majority of anatomical dead space of the patient (nasopharynx).ĭead space from the patient. It is possible to measure anatomical dead space and physiological dead space alveolar dead space can then be determined by subtracting the first from the second. BOHR EQUATION-1 Measures physiological dead space. Types of Dead Spaceĭead space from equipment, such as tubes ventilator circuitry. Glomerular Filtration and Tubular Functionĭead space is the proportion of minute ventilation which does not participate in gas exchange. Anatomical dead space is the volume of air that fills the conducting zone, about 150 mL (30 of normal tidal volume). Anatomic dead space is the total volume of the conducting airways from the nose or mouth down to the level of the terminal bronchioles, and is about 150 ml on the. There are two different ways to define dead space- anatomic and physiologic. Functional Anatomy and Control of Blood Flow Anatomic dead space can be measured by Fowlers method,3 in which a single breath of oxygen is inhaled and the concentration of nitrogen in the subsequent. Dead space is the portion of each tidal volume that does not take part in gas exchange.
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