LUNG VOLUMES & CAPACITY

LUNG VOLUMES & CAPACITY


LUNG VOLUMES & CAPACITY 

Sl. No LUNG VOLUME  METRICS
 1.  Tidal volume (TV)

  • Volume of air that moves in or out of the lung with each normal breath
 500 ml
 2.  Inspiratory reserve volume (IRV) –

  • Volume of excess air of tidal volume, inspired with maximal inspiratory effort.
 3000 ml
 3.  Expiratory reserve volume (ERV) – 

  • Volume of excess air of tidal volume, expired with maximal expiratory effort. 
1200 ml 
 4.  Residual volume (RV) –

  • Volume of air remaining in lungs after maximal expiration.
 1200 ml
 Sl.no   LUNG CAPACITIES  METRICS
 1.  Expiratory capacity (EC) –

  • Maximum volume of air expired after normal tidal inspiration. 
  • Sum of tidal volume & expiratory reserve volume (EC – TV + ERV)
 1700 ml
 2.  Inspiratory Capacity (IC) –

  • Maximum volume of air inspired after normal tidal inspiration. 
  • Sum of tidal volume & inspiratory reserve volume (IC – TV + IRV)
 3500 ml
 3.  Functional residual capacrty (FRC)

  • Volume of air in lungs after expiration.
  • FRC – ERV + RV 
 2400 ml
 4.  Total lung capacity (TLC) – 

  • Maximum volume of air in lung at end of maximal inspiration.
  • TLC- TV + IRV + ERV +RV or TLC – VC +RV.
  • Depends on compliance of lung.
 5900 ml
 5.  Vital capacity (VC) – 

  • Maximum volume of air expired after maximal inspiration.
  • VC = IC + ERV (IRV + TV + ERV).
Also,  
  • Forced Vital Capacity(FVC)– Vital capacity measures by forceful expiration.
  • Fraction of FVC breathed out in 1st second – Forced Expiratory Volume 1 (FEV1).
  • FEV1 is 80% of VC.
 4700 ml

Exam Important

LUNG VOLUMES & CAPACITY

  • Tidal Volume (TV) – Volume of air that moves in or out of the lung with each normal breath.
  • Residual volume (RV) – Volume of air remaining in lungs after maximal expiration.
  • Expiratory reserve volume (ERV) – 1200 ml
  • Inspiratory capacity (IC) calculated by sum of tidal volume & inspiratory reserve volume IC = TV + IRV.
  • Functional residual capacity (FRC) – Volume of air in lungs after expiration. 
    • Calculated by FRC – ERV + RV.  
    • About 2400 ml
  • Total Lung Capacity is about 5900 ml. Depends on lung compliance.
  • Vital capacity (VC) is about 4700 ml.
  • Fraction of FVC breathed out in 1st second – Forced Expiratory Volume 1 (FEV1).
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