Source: International Congress 2015 – Lung function: exploring the boundaries of the respiratory system
Disease area: Respiratory critical care, Sleep and breathing disorders

Abstract

Background: in lung function laboratories, all instruments are subjected to calibration procedures daily. Strangely, for APAP (which carry many measures of patient ventilation) there are not procedures for calibration, it is not easy to check the behaviour of the machine over the time.Methods: we wanted to test the behaviour of 5 APAP of the same manufacturer and the same model. The 5 machines differed in terms of the amount of hours of service. It was made a test circuit provided three different levels of resistance to the flow generated by the device with and without a controlled leak of a similar magnitude to that of the interfaces normally used. We measured the flow generated by each machine at various nominal pressure levels (range 5-20 cm H2O)Results: the measurements have shown that, for the same nominal pressure, flow decrease with the increase of hours of service of APAP (Fig.1)



Fig. 1 Measured flow resistance realized with pipe of 16 mm in two devicesConclusions: from the results obtained, it can be assumed that in the life of a APAP there may be a different behaviour depending on the operating hours of the device itself. This could lead to obtain titrations not correct (e.g. overestimation of therapeutic pressure) with the risk of compromising the compliance to treatment. Further evaluations will be performed on the devices in order to check the linearity and accuracy of the various components of the system (e.g. the flow sensor).


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Citations should be made in the following way:
Gianni Prest (Imperia, Italy), E. Isnardi, F. Bertolino, G. Prest. Do the CPAP auto titration systems (APAP) require calibration?. Eur Respir J 2015; 46: Suppl. 59, 959

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