![]() ![]() ![]() Dotted lines show static airway dimensions for comparison with the dynamic state. Middle and bottom, Conditions at the onset of maximal flow and with increased expiratory effort, respectively. Top, The static relationships of pleural pressure (Ppl), alveolar pressure (Palv), and intraluminal airway pressure (P aw), and airway dimensions at a fixed lung volume. A wealth of details of procedures, normal and predicted values, equations, and descriptions of techniques can be found in the online chapter. This chapter has an extended online version. The purpose of this chapter is to describe these pulmonary function tests, reviewing briefly their physiologic basis, their equipment and protocol requirements, and their clinical results. The accuracy of our inferences depends on a complete knowledge of the physiologic basis of the functions tested, properly validated equipment, and appropriate protocols. It is important to remember, however, that these conclusions are based on inferences, not specific proofs. These patterns allow us to quantify the severity of respiratory disease, which enables us to detect disease early and characterize the natural history and response to treatment. Different diseases cause different patterns of abnormalities in a battery of pulmonary function tests. It is worth emphasizing that pulmonary function tests do not diagnose specific diseases. Pulmonary function tests permit accurate, reproducible assessment of the functional state of the respiratory system. ![]()
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