II. Images

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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