Lung Volumes and Lung Segments
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Total Lung Capacity (TLC)
The volume in the lungs at maximal inflation. The max amount of air the lungs can accommodate.
IC + FRC
Functional Residual Capacity (FRC)
The volume in the lungs at the end-expiratory position (normal exhalation)
ERV + RV
Inspiratory Capacity (IC)
Volume of air that can be inhaled after a normal exhalation.
Vt + IRV
Vital Capacity (VC)
The volume of air that can be exhaled after the deepest (max) inhalation.
Vt + ERV
Residual Volume (RV)
The volume of air remaining in the lungs after a maximal exhalation.
Expiratory Reserve Volume (ERV)
The maximal volume of air that can be exhaled from the end-expiratory position (during normal Vt exhalation)
Inspiratory Reserve Volume (IRV)
the maximal volume that can be inhaled from the end-inspiratory level (after a normal Vt inhalation)
that volume of air moved into or out of the lungs during one quiet breath
7 - 9 ml/kg of IBW
Right Upper Lung
Right Middle Lung
Right Lower Lung
Left Upper Lung
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