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Abstract
Airway resistance is the ratio of driving pressure to the rate of the airflow in the airways. The most frequent methods used to measure airway resistance are whole-body plethysmography, the interrupter technique and the forced oscillation technique. All these methods allow to measure resistance during respiration at the level close to tidal volume, they do not require forced breathing manoeuvres or deep breathing during measurement. The most popular method for measuring airway resistance is whole-body plethysmography. The results of plethysmography include among others the following parameters: airway resistance (Raw), airway conductance (Gaw), specific airway resistance (sRaw) and specific airway conductance (sGaw). The interrupter technique is based on the assumption that at the moment of airway occlusion, air pressure in the mouth is equal to the alveolar pressure . In the forced oscillation technique (FOT), airway resistance is calculated basing on the changes in pressure and flow caused by air vibration. The methods for measurement of airway resistance that are described in the present paper seem to be a useful alternative to the most common lung function test - spirometry. The target group in which these methods may be widely used are particularly the patients who are unable to perform spirometry.
Highlights
Airway resistance is defined as the ratio of driving pressure to the rate of the airflow in the airways [1, 2]
Specific airway resistance is calculated from the gas pressure and the proportion of the change in thoracic volume to the flow in the mouth [4]. sRaw is usually applied to measure resistance in children, for it does not require the measurement of lung volume using a breathing manoeuvre against a closed shutter, which is difficult to perform in this group of patients [5]
The methods for measurement of airway resistance that were presented in the present paper seem to be a useful alternative to the most common lung function test — spirometry
Summary
Airway resistance is defined as the ratio of driving pressure to the rate of the airflow in the airways [1, 2]. SRaw is usually applied to measure resistance in children, for it does not require the measurement of lung volume using a breathing manoeuvre against a closed shutter, which is difficult to perform in this group of patients [5].
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