![]() Anatomical dead space is only part of physiological dead space. Dead space is an intrinsic part of volume capnography and a significant value for clinical situations. Pathologies- the constriction or dilation of the bronchioles is thought to cause a variability of anatomical dead space.Īpproximation of anatomical dead space can be done with the patient’s body weight in pounds.High flows reduce/clear out decreasing the portion of dead space that is rebreathed. Flow- changes in gas flow can cause dead space volume to change.Posture/Positioning- Dead space decreases with the supine position increases during the sitting position.Age- extrathoracic causes in infants and children increase dead space compared to adults.Though anatomical dead space is considered a fixed quantity, the patient’s age, posture, and pathology can affect the actual measurement. ![]() ![]() Fowler’s dead space measurement is dependent on the patient’s size.
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