![]() If a ventilatory pattern is identified, its severity is graded. Next, the determination of an obstructive or restrictive ventilatory patten is made. The first step is determining the validity of the test. A simplified and stepwise method is key to interpreting spirometry. However, interpreting spirometry results can be challenging because the quality of the test is largely dependent on patient effort and cooperation, and the interpreter’s knowledge of appropriate reference values. Technology advancements have made spirometry much more reliable and relatively simple to incorporate into a routine office visit. Spirometry is a powerful tool that can be used to detect, follow, and manage patients with lung disorders. BARREIRO, D.O., and IRENE PERILLO, M.D., University of Rochester School of Medicine and Dentistry, Rochester, New YorkĪm Fam Physician. Mecholyl challenge, bronchial provocation test An Approach To Interpreting Spirometry Fingernail polish, increased venous pressures, and motion artifact if the actual SaO2 is greater than 85% also can cause underestimation of the SaO2. Underestimation of SaO2 is possible because intravascular dyes, such as methylene blue and indocyanine green, produce transient reductions in SpO2. Overestimation of SaO2 is possible with bright sunlight on the probe, fluorescent lights, operating room lights, infrared heat lamps, elevated CoHb, elevated metHb, anemia, and motion artifact if the actual SaO2 is less than 85%. ![]() Lung Function – Lung Volumes and Capacities
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