ATS Pulmonary Function Laboratory Manual

ATS Pulmonary Function Laboratory Management & Procedure Manual | 3rd Edition

Where: Δ V/ Δ P represents the slope of the simultaneous changes in body volume, which, in a pressure plethys- mograph, represents the small changes in pressure within the box calibrated to reflect changes in volume of the patient versus the change in pressure at the mouth. P B = barometric pressure

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