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Diffusing Capacity of the Lung - The gas commonly used to measure diffusing capacity is carbon monoxide (CO).
Techniques to Measure Residual Volume
The following techniques can be used to measure residual volume (RV): - Helium dilution - Body plethysmography - Nitrog...
- The gas commonly used to measure diffusing capacity is carbon monoxide (CO).
Techniques to Measure Residual Volume
The following techniques can be used to measure residual volume (RV):
- Helium dilution
- Body plethysmography
- Nitrogen washout
Indications for Assessing Pulmonary Function
Indications for pulmonary function testing include:
- Screen for pulmonary disease
- Evaluate patients for surgical risk
- Assess the progression of disease
Cardiac disability assessment is not a primary indication for pulmonary function testing.
Validity of Forced Vital Capacity (FVC) Measurement
To ensure the validity of the FVC measurement, a patient should perform three acceptable attempts.
Body Plethysmograph and Functional Residual Capacity
When determining functional residual capacity (FRC), the body plethysmograph operates on Boyle's
Law.
, Normal Predicted Lung Volumes
- The normal predicted total lung capacity (TLC) for adults is approximately 6 liters.
- Total lung capacity (TLC) is equal to:
- TLC = VT + ERV + IRV + RV
Where:
- VT = Tidal Volume
- ERV = Expiratory Reserve Volume
- IRV = Inspiratory Reserve Volume
- RV = Residual Volume
Calibration and Accuracy
To determine the accuracy of a water-sealed spirometer in measuring lung volumes, a calibrated 3-L
syringe should be used.
- A spirometer in continual use should undergo volumetric calibration at least daily.
Methacholine Challenge Testing
After administering a 0.03 mg/ml dose of methacholine to assess for asthma and observing no change in
FVC, the appropriate next step is to double the dose and repeat the FVC maneuver.
Pulmonary Function Data Interpretation
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