However, V D/V T is rarely calculated in clinical practice, because its measurement is perceived as challenging. In patients with acute respiratory distress syndrome (ARDS), V D/V T has prognostic value and can be used to guide ventilator settings. ( physiology ) The sum of the parallel and the serial dead spaces.Physiological dead space (V D/V T) represents the fraction of ventilation not participating in gas exchange.( physiology ) The sum of the anatomic plus the alveolar dead spaces.Because this is a functional measurement, the volume is called the physiologic dead space. Lippincott Williams & Wilkins Ninth edition.īohr's method measures the volume of the lung which does not eliminate CO 2. West, Respiratory Physiology: The Essentials. ![]() ( physiology ) That volume of air in the lung that does not eliminate carbon dioxide, as defined functionally by the Bohr equation.( physiology ) That volume of air in the lung which does not partake in gas exchange.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. ![]() This definition became inadequate once the alveolar dead space was described.
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