Airway resistance (R)

Airway resistance refers to the pressure difference created by the unit flow in the airway. Usually calculated by (airway oral pressure-alveolar pressure)/flow rate, expressed as the pressure difference when the ventilation volume per second is 1L. Clinically applicable to a variety of obstructive ventilatory dysfunction diseases as well as mechanical ventilation and respiratory monitoring. Basic Information Specialist classification: Respiratory examination classification: pulmonary function test Applicable gender: whether men and women apply fasting: not fasting Tips: There are no special contraindications before the examination, please follow the doctor's advice. Normal value Normal value: exhalation (1.27±0.24) cmH2O/(L·s) (1 cmH2O≈0.098 kPa); inhalation (1.23±0.22) cmH2O/(L·s) when the flow rate is 0.5 L/s. Clinical significance Clinical use 1 can better reflect the obstruction of the airway. 2 to help determine whether the cause of lung dysfunction is from the airway. 3 bronchial asthma, emphysema and obstructive ventilatory dysfunction can cause increased airway resistance; in addition, tracheal intubation or cannula, mechanical ventilation ducts can also cause increased airway resistance. High results may be diseases: bronchial asthma, emphysema precautions Before the test: No special contraindications, please follow the doctor's advice. Inspection process Inspection method: measured by airway resistance tester. Not suitable for the crowd Generally no taboos. Adverse reactions and risks Generally no complications and harm.