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Influence of increased anatomical dead space no functional residual capacity of lungs and the lung clearance index.

A study of the influence of added anatomical dead space on the functional residual capacity of the lung was carried out on a total number of 40 healthy subjects of ages ranging between 21 and 50 years. The functional residual capacity was found to decrease as additional dead space was introduced in the breathing circuit. This decrease was associated with an increase in tidal volume, lung functions, as given by the lung clearance index, were found to deteriorate with each addition of dead space. There was also an increase in pulse rate in all age groups.