Lung volumes

TLC Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV.
VT Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (VT indicates a subdivision of the lung; when tidal volume is precisely measured, as in gas exchange calculation, the symbol VT or VT is used.)
RV Residual volume: the volume of air remaining in the lungs after a maximal exhalation
ERV Expiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position
IRV Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level
IC Inspiratory capacity: the sum of IRV and TV
IVC Inspiratory vital capacity: the maximum volume of air inhaled from the point of maximum expiration
VC Vital capacity: the volume of air breathed out after the deepest inhalation.
VT Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (VT indicates a subdivision of the lung; when tidal volume is precisely measured, as in gas exchange calculation, the symbol VT or VT is used.)
FRC Functional residual capacity: the volume in the lungs at the end-expiratory position
RV/TLC% Residual volume expressed as percent of TLC
VA Alveolar gas volume
VL Actual volume of the lung including the volume of the conducting airway.
FVC Forced vital capacity: the determination of the vital capacity from a maximally forced expiratory effort
FEVt Forced expiratory volume (time): a generic term indicating the volume of air exhaled under forced conditions in the first t seconds
FEV1 Volume that has been exhaled at the end of the first second of forced expiration
FEFx Forced expiratory flow related to some portion of the FVC curve; modifiers refer to amount of FVC already exhaled
FEFmax The maximum instantaneous flow achieved during a FVC maneuver
FIF Forced inspiratory flow: (Specific measurement of the forced inspiratory curve is denoted by nomenclature analogous to that for the forced expiratory curve. For example, maximum inspiratory flow is denoted FIFmax. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.)
PEF Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter
MVV Maximal voluntary ventilation: volume of air expired in a specified period during repetitive maximal effort

Lung volumes and lung capacities refer to the volume of air associated with different phases of the respiratory cycle. Lung volumes are directly measured; Lung capacities are inferred from lung volumes.

The average total lung capacity of an adult human male is about 6 litres of air.

Tidal breathing is normal, resting breathing; the tidal volume is the volume of air that is inhaled or exhaled in only a single such breath.

The average human respiratory rate is 30-60 breaths per minute at birth,[1] decreasing to 12-20 breaths per minute in adults.[2]

Factors affecting volumes

Several factors affect lung volumes; some can be controlled and some cannot. Lung volumes vary with different people as follows:

Larger volumes Smaller volumes
taller people shorter people
people who live at higher altitudes people who live at lower altitudes
non obeseobese[3]

A person who is born and lives at sea level will develop a slightly smaller lung capacity than a person who spends their life at a high altitude. This is because the partial pressure of oxygen is lower at higher altitude which, as a result means that oxygen less readily diffuses into the bloodstream. In response to higher altitude, the body's diffusing capacity increases in order to process more air.

When someone living at or near sea level travels to locations at high altitudes (e.g., the Andes; Denver, Colorado; Tibet; the Himalayas) that person can develop a condition called altitude sickness because their lungs remove adequate amounts of carbon dioxide but they do not take in enough oxygen. (In normal individuals, carbon dioxide is the primary determinant of respiratory drive.)

Specific changes in lung volumes also occur during pregnancy. Functional residual capacity drops 18–20%,[4] typically falling from 1.7 to 1.35 litres, due to the compression of the diaphragm by the uterus. The compression also causes a decreased total lung capacity (TLC) by 5%[4] and decreased expiratory reserve volume by 20%.[4] Tidal volume increases by 30–40%, from 0.5 to 0.7 litres,[4] and minute ventilation by 30–40%[4][5] giving an increase in pulmonary ventilation. This is necessary to meet the increased oxygen requirement of the body, which reaches 50 mL/min, 20 mL of which goes to reproductive tissues. Overall, the net change in maximum breathing capacity is zero.[4]

Values

Average lung volumes in healthy adults[6]
Volume Value (litres)
In men In women
Inspiratory reserve volume 3.1 1.9
Tidal volume 0.5 0.5
Expiratory reserve volume 1.2 0.7
Residual volume 1.2 1.1
Lung capacities in healthy adults[6]
Volume Average value (litres) Derivation
In men In women
Vital capacity 4.6 3.1 IRV plus TV plus ERV
Inspiratory capacity 3.5 2.4 IRV plus TV
Functional residual capacity 2.3 1.8 ERV plus RV
Total lung capacity 5.8 4.2 IRV plus TV plus ERV plus RV

The tidal volume, vital capacity, inspiratory capacity and expiratory reserve volume can be measured directly with a spirometer. These are the basic elements of a ventilatory pulmonary function test.

Determination of the residual volume is more difficult as it is impossible to "completely" breathe out. Therefore, measurement of the residual volume has to be done via indirect methods such as radiographic planimetry, body plethysmography, closed circuit dilution (including the helium dilution technique) and nitrogen washout.

In absence of such, estimates of residual volume have been prepared as a proportion of body mass for infants (18.1 mL/kg),[7] or as a proportion of vital capacity (0.24 for men and 0.28 for women)[8] or in relation to height and age ((0.0275* Age [Years]+0.0189*Height [cm]-2.6139) litres for normal-mass individuals and (0.0277*Age [Years]+0.0138*Height [cm]-2.3967) litres for overweight individuals).[9] Standard errors in prediction equations for residual volume have been measured at 579 mL for men and 355 mL for women, while the use of 0.24*FVC gave a standard error of 318 mL.[10]

Online calculators are available that can compute predicted lung volumes, and other spirometric parameters based on a patient's age, height, weight, and ethnic origin for many reference sources.

Restrictive and obstructive

Scheme of changes in lung volumes in restricted and obstructed lung in comparison with healthy lung.

The results (in particular FEV1/FVC and FRC) can be used to distinguish between restrictive and obstructive pulmonary diseases:

Type Examples Description FEV1/FVC
restrictive diseases pulmonary fibrosis, Infant Respiratory Distress Syndrome, weak respiratory muscles, pneumothorax volumes are decreased often in a normal range (0.8 - 1.0)
obstructive diseases asthma or COPD or Emphysema volumes are essentially normal but flow rates are impeded often low (Asthma can reduce the ratio to 0.6, Emphysema can reduce the ratio to 0.78 - 0.45)

See also

References

  1. ↑ Scott L. DeBoer (4 November 2004). Emergency Newborn Care. Trafford Publishing. p. 30. ISBN 978-1-4120-3089-2.
  2. ↑ Wilburta Q. Lindh; Marilyn Pooler; Carol Tamparo; Barbara M. Dahl (9 March 2009). Delmar's Comprehensive Medical Assisting: Administrative and Clinical Competencies. Cengage Learning. p. 573. ISBN 978-1-4354-1914-8.
  3. ↑ Jones RL, Nzekwu MM. The effects of body mass index on lung volumes. Chest. 2006 Sep; 130 (3) :827–33. PubMed PMID 16963682.
  4. 1 2 3 4 5 6 Simpson, Kathleen Rice; Patricia A Creehan (2007). Perinatal Nursing (3rd ed.). Lippincott Williams & Wilkins. pp. 65–66. ISBN 978-0-7817-6759-0.
  5. ↑ Guyton and hall (2005). Textbook of Medical Physiology (11 ed.). Philadelphia: Saunders. pp. 103g. ISBN 81-8147-920-3.
  6. 1 2 Ganong, William. "Fig. 35-7". Review of Medical Physiology (21st ed.).
  7. ↑ Morris, Mohy G. (2010). "Comprehensive integrated spirometry using raised volume passive and forced expirations and multiple-breath nitrogen washout in infants". Respiratory Physiology & Neurobiology 170 (2): 123–140. doi:10.1016/j.resp.2009.10.010. ISSN 1569-9048. PMC 2858579. PMID 19897058.
  8. ↑ Wilmore, J. H. (1969). "The use of actual predicted and constant residual volumes in the assessment of body composition by underwater weighing". Med Sci Sports 1: 87–90. doi:10.1249/00005768-196906000-00006.
  9. ↑ MILLER, WAYNE C.; SWENSEN, THOMAS; WALLACE, JANET P. (February 1998). "Derivation of prediction equations for RV in overweight men and women". Medicine & Science in Sports & Exercise 30 (2): 322–327. doi:10.1097/00005768-199802000-00023. PMID 9502364.
  10. ↑ Morrow JR Jr, Jackson AS, Bradley PW, Hartung GH. (Dec 1986). "Accuracy of measured and predicted residual lung volume on body density measurement". Med Sci Sports Exerc 18 (6): 647–52. doi:10.1249/00005768-198612000-00007. PMID 3784877.

External links

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