lung volumes


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lung volumes

Physiology A group of air 'compartments' into which the lung may be functionally divided
Lung volumes  
Expiratory reserve capacity–ERV The maximum volume of air that can be voluntarily exhaled
Functional residual capacity (FRV) Volume left in the lungs at the end of a normal breath which is not normally part of the subdivisions
Inspiratory capacity–IC The maximum volume that can be inhaled
Inspiratory Reserve capacity–IRC The maximum volume that can be inhaled above the tidal volume
Tidal volume–VT The normal to-and-fro respiratory exchange of 500 cc; vital capacity is the maximum amount of exhalable air; after a full inspiration, which added to the residual volume, is the total lung capacity
Total lung capacity–TLC The entire volume of the lung, circa 5 liters
Vital capacity–VC The maximum volume that can be inhaled and exhaled  
Lung volumes.

lung volumes

measurements made as part of pulmonary function tests; the volumes that move in and out during the normal breathing cycle, and with deliberate additional effort, can be measured directly by spirometry with the subject breathing through a closed circuit in and out of a cylinder inverted over water, or into a vitalograph, or by pneumotachograph; the residual volume can be measured only indirectly by dilution methods (usually with helium) or by whole body plethysmography. See also ventilation. See figure and table overleaf .
Table 1: Lung volumes
VT (TV)Tidal volumeVolume of inspired/expired air moving in and out with each breath
IRV
ERV
Inspiratory and expiratory reserve volumesUsed when tidal volume increases above that at rest
VCVital capacityVolume that can be inspired/expired after full expiration/inspiration
FEV1Forced expiratory volume in 1sVolume exhaled in the first second, with maximal effort after full inspiration
FRCFunctional residual capacityVolume remaining in the lungs at end-expiration; decreases as tidal volume increases
RVResidual volumeRemains after a maximal expiratory effort; cannot be exhaled
TLCTotal lung capacityVital capacity + residual volume
References in periodicals archive ?
In all cases, final reports should include name references to the predicted sets used for specific tests (spirometry, lung volumes, DLCO, etc.
Reticular (cystic) pattern with normal or increased lung volumes
During a forced expiration, lung volume decreases because of the volume of gas expired from the mouth, and also due to compression of alveolar gas by the positive intrathoracic pressure.
Nevertheless, the significance of the finding cited above remains in the fact that this optimized pattern can be necessary to the increment of breathing performance and can also partially explain the higher lung volumes of swimmers reported in literature, calling for new investigations involving breathing patterns and lung volumes.
Lung volumes and forced ventilatory flows: Report of the Working Party Standardization of Lung Function Tests, European Community for Steel and Coal--Official Statement of the European Respiratory Society.
Other diagnostic criteria for HP include findings of restrictive lung disease with reduced lung volumes in typical pulmonary function tests (17).
As expected, preliminary data indicated that the absolute lung volume increased with gestational age, although there was a decrease in lung volume relative to total fetal body volume toward the end of pregnancy.
Pulmonary Functions--Measurements taken to determine lung volumes and lung capacities
Included in the kits is LabScribe2 Metabolic Calculations Software Module which enables easy calculation of metabolic parameters directly from the recorded oxygen and carbon dioxide concentrations, lung volumes, and heart rates.
Region VEnstra GE[micro]taland (VGR) advertising contract for a complete system intended to be used for pulmonary function study for adults and children with dynamic spirometry, static lung volumes, CO diffusion capacity, lung compliance and airway resistance including a workstation with the required equipment.
They found that pure resveratrol intake was associated with higher lung volumes and that white wine intake (but not red wine intake) and was associated with lower risk of airway obstruction.