体积描记仪(简称体描仪)可测定胸腔内气量(VTG)、气道阻力(Raw)、气道传导率(Gaw)、比气道传导率(SGaw)和比气道阻力(SRaw)等,用以检测气道包括小气道有无阻塞存在,具有较好的灵敏性,操作简便,几分钟内即可完成,无创伤性,因而可以作为常规方法应用于临床。一、测量方法:我们使用美国coLLins压力型体描仪,按规定校准,箱内温度改变用日本光电D—50型传感器遥测。箱压变化由评比室自动调节,以保持恒定。被检者了解测定要领后,坐入箱内,(口缷)好接口器,夹好鼻夹,作平静呼吸,适应后关闭箱门,待各项条件稳定后,通过麦克风令被检者以 Plethysmography can measure VTG, Raw, Gaw, SGaw, SRaw, etc. , To detect airway, including small airway presence or absence of blockage, has good sensitivity, easy to operate, can be completed within minutes, non-invasive, and thus can be used as a routine method in clinical. First, the measurement method: We use the United States coLLins pressure-type body contour instrument, according to the provisions of the calibration, the temperature inside the box with Japanese photoelectric D-50 sensor telemetry. Box pressure changes by the assessment room automatically adjusted to maintain a constant. The subjects were informed of the measurement essentials, sitting in the box, (mouth 缷) a good interface, folder clip nose clip for calm breathing, adapted to close the door, until the conditions are stable, the subject to be inspected by a microphone