(5) where Pet co2 is equal to use to calculate total (apparatus + anatomic + physiologic) dead-space fraction of tidal volume. ![]() Causes on increase in physiologic dead space. Dead space (V D /V T) can be determined from a variant of the Bohr equation: (4) or. ![]() 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. Physiologic dead space can quickly provide insight into how patients gas exchange in the lungs are functioning. Clearance of CO2 decreases, and therefore minute volume requirements and work of breathing are increased. Types of Dead Spaceĭead space from equipment, such as tubes ventilator circuitry. Increasing dead space has the same effect as decreasing the tidal volume. 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
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