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Functional Residual

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Alternate question for PFT Lab

Do a comparison of FRC (functional residual capacity) determination of Open and Closed methods.

The FRC or Functional Residual Capacity is defined as the measurement of air in the lung after the patient has exhaled. Patrick Neligan MD is quoted saying “It is a space in which gas exchange continues to occur throughout the respiratory cycle, which makes sense as blood is continuously passing through the lungs. If there were no FRC, we would be continuously reabsorbing carbon dioxide” (Neligan 2002, Critical care tutorials website, pulmonology, why do we use PEEP). The means that larger the space the more oxygen is absorbed. If there is a smaller space because of a respiratory ailment, there is less lung space

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