The usual loss of alveoli is minimal in a healthy individual, so the anatomic dead space is?10/6/2023 ![]() ![]() The ratio of physiologic dead space to tidal volume is usually about 1/3. What is anatomic dead space the gas that fills non-respiratory exchange surfaces. 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 dead space includes the anatomic dead space of the conducting airways plus a functional dead space in the alveoli. By definition, the physiologic dead space is the total volume of the lungs that does not participate in gas exchange. (tidal volume (mL/breath) - physiologic dead space) represents the amount of insipired gas available for gas exchange with the blood. The concept of physiologic dead space is more abstract than the concept of anatomic 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. PH2O partial pressure of water in the alveoli 47mmHg. 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. Dead space is the volume of a breath that does not participate in gas exchange. ![]()
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