PURPOSE: Subjects with airway obstruction are strongly recommended to monitor their lung function, which is particularly variable in asthma. Unlike PEFR, other personal measurements (such as FEV1) are still difficult to perform. PIKO-1 is the an electronic device for both PEFR and FEV1 personal monitoring. It is pocket sized (35 g weight), precise, able to set predicted values (ATS 1994) and to control the quality of respiratory manoeuvres, and can storage of up to 96 test results. Aim: to compare PEFR and FEV1 values from PIKO-1 and from a conventional spirometer in subjects with airway obstruction.
METHODS: Methods: 352 subjects (217 men; mean age = 47.6 years ± 19.0 SD; mean weight = 72.6 kg ± 15.0 SD; mean height = 168.1cm ± 11.9 SD) performed sequential measurements from a PIKO-1 device (PDS, Ferraris, USA) and a spirometer (Masterscreen, Jaeger, Germany). Statistics: Wilcoxon signed-rank test and sign test.
RESULTS: Mean FEV1 values from the spirometer and PIKO-1 were 2.9 ± 1.1 and 3.0 L± 1.1, and mean PEFR values were 466.1 L/min±164.5 SD and 426.3 L/min±151.6 SD, respectively. PIKO-1 proved to overestimate FEV1 values by 4% (p<0.0001) and to underestimate PEFR values by 8% (p<0.000) systematically.
CONCLUSION: 1) The precision of both PIKO-1 measurements prove slightly lower than claimed; 2) PEFR and FEV1 measurements should be reset by two different constants;.
CLINICAL IMPLICATIONS: PIKO-1 is a suitable and reliable device for the personal monitoring of patients with airway obstruction.
DISCLOSURE: Roberto Dal Negro, None.