![]() ![]() 150 The approximate partial pressure of oxygen at standard atmospheric pressure is about mm Hg. The ratio of physiologic dead space to tidal volume is usually about 1/3. If the tidal volume of a given individual is 500 ml, then the anatomical dead space is approximately ml. Alveolar dead space is the volume of gas within unperfused alveoli (and thus not participating in gas exchange either) it is usually negligible in the healthy, awake patient. Get faster at matching terms How does anatomical dead space differ from physiological dead space Click card to see definition Anatomical dead space refers to the volume of the lung not involved in gas exchange, while physiological dead space includes anatomical dead space as well as alveolar dead space. ![]() Anatomic dead space is the volume of gas within the conducting zone (as opposed to the transitional and respiratory zones) and includes the trachea, bronchus, bronchioles, and terminal bronchioles it is approximately 2 mL/kg in the upright position. Measurement of Physiological Dead Space using the Bohr Equation to measure VD, the value for alveolar CO2 is taken as the ETCO2. Physiologic or total dead space is the sum of anatomic dead space and alveolar dead space. Anatomical dead space is the volume of the conducting airways (from the nose, mouth and trachea to the terminal bronchioles). ![]() Anatomic dead space, Breathed gas that does. Anatomical dead space is the volume of air in the conducting airways that does not participate in gas exchange. Dead space is the volume of a breath that does not participate in gas exchange. Shunting of venous blood into the systemic circulation may occur. ![]()
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