![]() The patient’s weight and height must be recorded with the patient barefoot and wearing only light clothing. The procedure must be carefully explained to the patient focusing on the importance of the patient’s cooperation to provide the most accurate results. Any bronchodilator therapy must also be stopped beforehand. Īll patients must be informed that they must abstain from smoking, physical exercise in the hours before the procedure. It is recommended that the spirometer can record at 15 s of the expiration time for the forced maneuver. The minimum specifications for a spirometer are the ability to measure a volume of 8L with an accuracy of ☓% or ±50ml with a flow measurement range of ☑41 sand a sensitivity of 200ml/s. Ultrasound spirometers can be based on any of the aforementioned open-circuit spirometer principles. Hotwire spirometers, in which a hot metal wire is heated, and the air used to cool it is used to calculate the flow, are also an example of open-circuit spirometers. Pneumotachographs are another example, which measures the airflow by measuring the pressure difference generated as the laminar flow passes through a certain resistance. The most commonly used open-circuit spirometer is the turbine flow meter, which records the rate at which turbines turn and derives the flow measurement based on proportionality. Open-circuit spirometers, which are more commonly used at present, do not have an air collecting system and instead measure the airflow, integrate the results, and calculate the volume. Closed-circuit spirometers are further sub-classified into wet and dry spirometers, which consist of a piston or a bellow acting as an air collecting system and a supported recording system that moves at the desired rate. Spirometers are classified into closed-circuit and open-circuit spirometers. The minimum space recommended is a 2.5* 3m room with 120 cm side doors. The first requirement for spirometry is physical space in order for the patient to be positioned comfortably. ![]()
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