In other words, the young people just had some normal anatomical dead space, and the elderly also had some added alveolar dead space. This happens when there is a lack of blood. Tenney & Millar (1956) found that in the elderly, physiological dead space was about 235ml, whereas it was only around 150ml for young controls. Some apparatus dead space may actually reduce total dead space, as an ETT bypasses the majority of anatomical dead space of the patient (nasopharynx).ĭead space from the patient. Physiological dead space or physiological shunts, arise from a functional impairment of the lung or arteries. Shunt increases the calculated Bohr-Enghoff dead-space, but does not affect Fowler, Bohr or Koulouris dead-spaces, or VDphys estimated by the shunt-corrected.
Types of Dead Spaceĭead space from equipment, such as tubes ventilator circuitry.
Glomerular Filtration and Tubular Functionĭead space is the proportion of minute ventilation which does not participate in gas exchange. Functional Anatomy and Control of Blood Flow Per-patient trajectory of PaO 2 /FiO 2 (a), ventilationperfusion matching (b), dead space (c) and shunt (d) at the three study time points, SP1, PP and SP2.Each line is the trajectory of one patient.
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