![]() The ratio of physiologic dead space to tidal volume is usually about 1/3. 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. It is an important parameter in respiratory medicine due to its relationship with blood carbon dioxide levels. 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. Minute ventilation (or respiratory minute volume or minute volume) is the volume of gas inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a persons lungs per minute. Chronic Bronchitis: Clinical Features up Smoking. ![]() Physiologic or total dead space is the sum of anatomic dead space and alveolar dead space. Ventilation may exceed perfusion in parts of the lung resulting in increased physiological dead air space. Dead space is the volume of a breath that does not participate in gas exchange. ![]()
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