physiological dead space


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physiological dead space

In the respiratory tract, any nonfunctional alveoli that do not receive air that participates in gas exchange. Possible causes include emphysema, pneumothorax, pneumonia, pulmonary edema, and constriction of bronchioles.
See: anatomical dead space
See also: space
References in periodicals archive ?
Causes of a high physiological dead space in critically ill patients.
Within 24 hours of performance of tracheostomy, before and after the procedure, they determined the physiological dead space fraction ([V.sub.d]/[V.sub.t]) using single breath capnograms, as well as spontaneous respiratory rate, [V.sub.t] (VE), peak inspiratory and end-inspiratory airway pressures during mechanical ventilation and arterial blood gases.

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