Ventilation coefficient

The Ventilationskoeffizent referred to in medicine a measure of the gas exchange between the air in the alveoli (alveoli) and the fresh air under the respiration ( ventilation ). This indicates what proportion of the alveolar volume is renewed per breath with fresh air (corresponds to the breath volume ). When breathing at rest, the ventilation coefficient is usually between 0.1 and 0.12, which means that only about 10 to 12 percent of the air in the alveoli is replaced by fresh air at rest. The ventilation coefficient can increase to 1 to 2 under load.

The ventilation coefficient is calculated as follows:

${\displaystyle Ventilationskoeffizient=(Vt-Vtr)/FRC}$(V _t = tidal volume , V _tr = dead space volume , FRC = functional residual capacity )

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• Klaus Golenhofen and Henriette Rintelen: Basic textbook physiology: textbook, compendium, questions and answers . Elsevier 2006, p. 262. ISBN 978-3437424823