The volume of the alveolar dead space is the difference of volumes of the physiological and anatomical dead spaces. The volume of anatomical dead space can be determined using the equal area method proposed by W.S.

The volume of physiological dead space is calculated using the C. The article describes methods for determining the volume of dead spaces using the capnovolumetry. The anatomical and alveolar dead spaces jointly together form the physiological dead space. The article provides information on the lung dead space – a part of the respiratory volume that does not participate in gas exchange.

However, differences in the exact way of measuring this space result in clinically significant different results and, therefore, debate remains about the true value of this measured parameter.Ĭopyright © 2023, StatPearls Publishing LLC.MEASUREMENT OF LUNG DEAD SPACE VOLUME BY CAPNOVOLUMETRYĭepartment of Pathophysiology, Ryazan State Medical University named after Academician I. Indeed, it may serve as a prognostic factor in patients with acute repository distress syndrome (ARDS) who require ventilation. This phenomenon has clinical significance because, both in healthy and impaired lungs, properly calculating and accounting for this non-physiological space is important for the proper respiratory care of ventilated patients. This is therefore termed anatomical dead space as it serves no respiratory function.

Anatomic dead space is an important phenomenon in respiratory physiology whereby, owing to the fact that upper airways do not function as locations for gas exchange, and because of the tidal nature of ventilation, there is always a fraction of the inspired air that does not perform a physiologic function of exchanging carbon dioxide for oxygen.

Dead space of lung