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. Types of Dead Spaceĭead space from equipment, such as tubes ventilator circuitry. Intrapulmonary Shunt (Qsp/Qt) Cardiac Index (CI) Oxygen contentoxygen bound to Hb + oxygen dissolved in plasma. A certain amount of dead space is normally present in every person (this is known as anatomical dead space: see below). An area with perfusion but no ventilation (and thus a V/Q of zero) is termed shunt. This concept can be extended to include factors that cause a dead space effect. 1 Carbon dioxide is retained, making a bicarbonate-buffered blood and interstitium possible. Definitions Simply put, dead space represents the volume of ventilated air that does not participate in gas exchange. Benefits do accrue to a seemingly wasteful design for ventilation that includes dead space. Glomerular Filtration and Tubular Functionĭead space is the proportion of minute ventilation which does not participate in gas exchange. Mask adds 82 cc of deadspace compared to tube, even though it is actually 125 cc more space (BR J Anesth 1969 41:94) What determines Venous Saturation. Components Total dead space (also known as physiological dead space) is the sum of the anatomical dead space and the alveolar dead space. Functional Anatomy and Control of Blood Flow
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