Carbon dioxide is retained, making a bicarbonate-buffered blood and interstitium possible.Total dead space (also known as physiological dead space) is the sum of the anatomical dead space plus the alveolar dead space.īenefits do accrue to a seemingly wasteful design for ventilation that includes dead space. pH is an indicator of the relative acidity or alkalinity of a solution Symbol relating the hydrogen ion concentration or activity of a solution to that of a standard solution approximately equal to the negative logarithm of the hydrogen ion concentration. Oxygen saturation as measured by pulse oximetry ![]() Oxygen saturation of the hemoglobin of arterial blood The term formerly used ( A-a D O 2) is discouraged.Īlveolar-arterial tension ratio P aO 2: P AO 2 The term oxygen exchange index describes this ratio. ![]() Volume of inhaled air that does not take part in the gas exchange Blood gas, acid-base, and gas exchange terms P aO 2Īrterial oxygen tension, or partial pressureĪlveolar oxygen tension, or partial pressureĪrterial carbon dioxide tension, or partial pressureĪlveolar carbon dioxide tension, or partial pressureĪlveolar-arterial oxygen tension difference.
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