Performance Evaluation of Contemporary
نویسنده
چکیده
A comprehensive evaluation of 62 spirometers from 37 different sources was performed using a two-part protocol: calibrated syringe, and dynamic waveform testing. All testingwas done with ambient air. Calibrated syringe testing examined the ability of the spirometers to accurately measure the output of a 3 L calibrating syringe under varying conditions. The accuracy, FVC volume linearity, and stability of each spirometer was determined from these data. AU but five of 42 spirometers accurately measured a 3 L calibrating syringe to within ±3 percent. Dynamic waveform testing consisted of introducing 24 standard waveforms into the spirometer from a computer-controlled air pump. The values ofFVC, FEy1, and FEF2.5-75% were compared to the actual values for each waveform to determine a performance rating. Only 35 (56.5 percent) of the spirometers performed acceptably when measuring the 24 standard waveforms. Nine (14.5 percent) were marginal and 18 (29.0 percent) were unacceptable. Fifty-nine (95 percent) ofthe 62 spirometers were computerized. Software errors were found in 25 percent ofthe computerized systems evaluated. Although using a 3 L syringe for quality control purposes is essential, simple testing of spirometers with a
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