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Manometers designed to measure the maximum negative pressure produced orally against an occluded airway or through the mouth after the complete expiration of residual volume followed by a single inspiration of maximum effort (i.e., inspiratory pressure). These manometers are typically a measuring instrument (e.g., an electrical resistance manometer) connected with a tubing set to a mouthpiece or tracheal tube adapter. The measurement of maximal inspiratory pressure, sustained maximal inspiratory pressure, and inspiratory contraction time are accepted noninvasive indexes of inspiratory muscle strength and endurance. Inspiratory pressure measuring units are intended for the assessment of inspiratory muscle strength and endurance, compromised pulmonary function, and upper airway obstruction in children due to enlarged tonsils; they are also used to determine the appropriateness of discontinuing (i.e., weaning) mechanical ventilation.
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