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resistance to flow of gas out of the lungs or the total resistance to flow of gas during the expiratory phase of the respiratory cycle.
1. The impedence to airflow from the trachea, bronchi, mouth or nose during exhalation.
2. The use of a restricted orifice, or flow resistor, during positive-pressure ventilation to retard the flow of exhaled gases.
3. An objective measure of bronchospasm.
See also: resistance