Q > V A (wasted perfusion) dead space alveolar. 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. Dead space is a space where gas exchange does not take place, such as the trachea it is ventilation without perfusion. Derivation of the Alveolar P02-PCO2 Diagram shunt alveolar unit: V A/Q 0, PAO2 40 mm Hg, PACO2 46 mm Hg. Types of Dead Spaceĭead space from equipment, such as tubes ventilator circuitry. The difference in pathophysiology between a shunt and dead space is essentially why oxygen therapy works wonders in some patients but has a minimal effect on others. Shunt (True shunt) Venous Admixture Physiological Dead Space Anatomical Dead Space Alveolar Dead Space Apparatus Dead Space V/Q Mismatch West Zones. Glomerular Filtration and Tubular Functionĭead space is the proportion of minute ventilation which does not participate in gas exchange. Anatomic shunts cause a ventilation-perfusion ratio of zero, and physiologic shunts cause a low ventilation-perfusion ratio, contributing to the lowering of partial pressure of oxygen (PaO2) in disease. Functional Anatomy and Control of Blood Flow Situations where the ventilation-perfusion ratios fall below one include anatomic shunts and physiologic shunts.
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