Nitrogen washout curve is used in: (A) Vital capacity, (B) Inspiratory reserve volume, (C) Functional residual capacity, (D) Residual volume
Answer is C. C. i.e. (Functional residual capacity) (62- 63 Anesthesia - Janes - Duke 3rd)Functional residual capacity (RV + ERV)* Measuring FRC is the cornerstone for determining the remainder of the lung volumesThree different technique1. Helium equilibration /dilution2. Nitrogen wash out3. Body plethysmography* Plethysmography is most accurate for determining FRC in patients with COPD and applies Boyles law