Functional Residual Capacity

Aka: Functional Residual Capacity, FRC

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II. Images

  1. lungVolumes.png

III. Physiology

  1. Functional Residual Capacity (FRC) is the volume remaining in lungs at resting expiratory level
  2. Equivalent to alveolar volume (Va)
    1. Respiratory Bronchioles and alveolar ducts: 30-40%
    2. Alveoli: 60-70%
  3. Calculation: ERV + RV
  4. Normal adult: 1.8 to 3.4 Liters

IV. Causes: Factors that increase FRC (Hyperinflation)

  1. Emphysema
  2. Aging
  3. Asthma
  4. Peribronchial fibrosis

V. Causes: Factors that decrease FRC

  1. Age
  2. Obesity
  3. Supine Posture
  4. Sedation

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