The ratio of physiologic dead space to tidal volume is usually about 1/3. Alveolar dead space is the volume of gas within unperfused alveoli (and thus not participating in gas exchange either) it is usually negligible in the healthy, awake patient. Anatomic dead space is the volume of gas within the conducting zone (as opposed to the transitional and respiratory zones) and includes the trachea, bronchus, bronchioles, and terminal bronchioles it is approximately 2 mL/kg in the upright position. Physiologic or total dead space is the sum of anatomic dead space and alveolar dead space. Hedenstierna G, Tusman G (2013) Corrections of Enghoff’s dead space formula for shunt effects still overestimate Bohr’s dead space. CO2 clearance rely on amount of gas exchange with key reliance on dead space. This study aimed to assess and compare changes in the alveolar dead space fraction (AVDSf). (PEEP) and 8 mL/kg without PEEP on pulmonary shunt and dead space volume. According to the above-mentioned model by Riley and Cournand (9), dead space can be referred to as wasted ventilation. Any patient with desaturation despite high supplemental oxygen likely has a shunt. Comparison of the effects of 2 ventilatory strategies using tidal volumes of 6 and 8 ml/kg on pulmonary shunt and alveolar dead space volume in upper abdominal cancers surgery Med J Islam Repub Iran. Dead space is the volume of a breath that does not participate in gas exchange. Dead space ventilation consists of an anatomical (the conducting airways) and an alveolar component (ventilated but nonperfused alveoli and/or alveoli overventilated relative to perfusion).
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