Interpretation of Pulmonary Function Tests by Robert E. Hyatt MD, Paul D. Scanlon MD, Masao Nakamura MD
By Robert E. Hyatt MD, Paul D. Scanlon MD, Masao Nakamura MD
- A new specialise in interpretation of advanced disorders
- Coverage of impulse oscillometry
- Solution web site to include textual content in addition to try out generator to accommodate cases
- "Pearls" concerning functionality or interpretation of key tests
- Carefully chosen authoritative references
- Clear illustrations demonstrating dozens of PFT patterns
- Illustrative cases
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Extra resources for Interpretation of Pulmonary Function Tests
Mayo Clin Proc 44:145–161, 1969. 1 The most important are the vital capacity (VC), residual volume (RV), and total lung capacity (TLC). The VC is measured by having the subject inhale maximally and then exhale slowly and completely. This VC is called the slow vital capacity (SVC). Similar to the SVC is the inspiratory vital capacity (IVC). The patient breathes normally and then exhales slowly and completely and inhales maximally. The SVC and the IVC provide similar results. The SVC is used in this book rather than the IVC.
The sum of the ERV and RV is termed the functional residual capacity (FRC). RV is the remaining volume of air in the lung at the end of a complete expiratory maneuver. It is determined by the limits of either the chest wall excursion or airway collapse or compression. In restrictive disorders, the limit of chest wall compression by the chest wall muscles determines RV. In obstructive disorders, the collapse of airways prevents air escape from the lungs, thereby determining the maximal amount exhaled.
Multiple pulmonary emboli: By blocking perfusion to alveolar capillaries, emboli effectively reduce the area. Also, primary pulmonary hypertension causes a reduction in capillary area. Anemia: By reducing pulmonary capillary hemoglobin, anemia also effectively reduces the area, as does any condition that lowers capillary blood volume. 7 × Hb] (Eq. 2)1 where cor represents corrected, unc uncorrected, and Hb hemoglobin. 22. Conditions That Effectively Increase Wall Thickness As is discussed in Chapter 6, however, much of the reduction in Dlco in these fibrotic conditions is thought to be due to mismatching of ventilation and perfusion.