physiologic dead space

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physiologic dead spaces 复数 physiologic dead spaces

1.

The volume of the conducting airways of the lung. This definition became inadequate once the alveolar dead space was described.

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1948. Ward S. Fowler, Lung Function Studies. II. The Respiratory Dead Space., J. Physiology. Vol. 154. p 406. Throughout this paper, the term physiological dead space will be used to refer to the volume of the conducting airway down to the location at which a large change in gas composition occurs.
2.

That volume of air in the lung which does not partake in gas exchange.

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3.

That volume of air in the lung that does not eliminate carbon dioxide, as defined functionally by the Bohr equation.

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2011. John B. West, Respiratory Physiology: The Essentials. Lippincott Williams & Wilkins; Ninth edition. Bohr's method measures the volume of the lung which does not eliminate CO₂. Because this is a functional measurement, the volume is called the physiologic dead space.
4.

The sum of the anatomic plus the alveolar dead spaces.

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5.

The sum of the parallel and the serial dead spaces.

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