![]() Carbon dioxide is retained, making a bicarbonate-buffered blood and interstitium possible. ![]() ![]() Benefits do accrue to a seemingly wasteful design for ventilation that includes dead space. The ratio of physiologic dead space to tidal volume is usually about 1/3. Total dead space (also known as physiological dead space) is the sum of the anatomical dead space and the alveolar dead space. 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. The anatomical dead space is that portion of the respiratory system, which is external to the alveoli and includes the air conveying ducts from the nostrils to. 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. Physiologic or total dead space is the sum of anatomic dead space and alveolar dead space. a space remaining in the tissues as a result of failure of proper closure of surgical or other wounds, permitting the accumulation of blood or serum. ![]() Dead space is the volume of a breath that does not participate in gas exchange. ![]()
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