functional residual capacity


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functional residual capacity

[¦fəŋk·shən·əl ri¦zij·ə·wəl kə′pas·əd·ē]
(physiology)
The volume of gas which remains within the lungs at expiratory standstill.
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In obese people, the presence of adipose tissue around the rib cage and abdomen and in the visceral cavity loads the chest wall and reduces functional residual capacity (FRC).
This point of transition is identified in Figure 1 as functional residual capacity (FRC), and the amount that we are able to further empty from our lungs is the expiratory reserve volume (ERV).
Studies of post-surgical patients have found improvement in pulmonary function, including oxygen saturation, (24) oxygen consumption and carbon dioxide production, (25) and functional residual capacity (26) in the sitting compared with the supine position (24-26) and further improvement in oxygen saturation in the standing position.
Jonmarker et al (3) reported that functional residual capacity consistently increases by about 50% with median sternotomy if the pleurae are intact.
The lung has a basic inherent capacity to maintain lung volume or functional residual capacity.

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