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  • Plethysmographs designed to measure and record data and graphics (i.e., a plethysmogram) of thoracic gas volume and air hold in the lungs when the muscles of respiration are relaxed (i.e., the functional residual capacity [FRC]). Whole-body plethysmographs usually consist of a relatively small sealed chamber that includes a mouthpiece, pressure sensors, and nasal clips; the equipment may include a computerized unit with software to process the information and record the results. The patient is placed inside the sealed chamber and then starts breathing through the open or closed mouthpiece with the nostrils closed using the nasal clips. The volume of air within the lungs is calculated using the Boyle\'s law (P1V1= P2V2) for the conditions within the tight closed chamber. Values of the FRC can be used to assess diseases and airway passage restrictions; FRC increased values are a sign of obstructive diseases because some airways do not empty normally, while decreased values are signs of a restrictive disease.
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