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Copyright ©ERS Journals Ltd 2001
Evaluation of a simplified oscillation technique for assessing airway obstruction in sleep apnoea
1 Unitat de Biofisica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona and 2 Institut de Pneumologia i Cirurgia Toràcica, Hospital Clinic. Institut d'Investigacions Biomèdiques August Pi Sunyer, Barcelona, Spain
CORRESPONDENCE: R. Farré, Unitat Biofisica i Bioenginyeria, Facultat Medicina, Casanova 143, 08036 Barcelona, Spain. Fax: 34 93 402 4516
Keywords: airway resistance, respiratory impedance, sleep monitoring
Received: June 15, 2000
Accepted October 10, 2000
This work was supported in part by Comision Interministerial de Ciencia y Tecnologia (CICYT, SAF99-0001) and by Direccion General de Ensenanza Superior e Investigacion Cientifica (DGESIC, PM98-0027).
The forced oscillation technique (FOT) is a noninvasive method that is useful for assessing airway obstruction and for titrating continuous positive airway pressure (CPAP) in patients with sleep apnoea. The aim was to evaluate the routine applicability of a simplified FOT set-up based on recording pressure and flow at the level of the CPAP device, i.e. obviating the need for connecting the transducers to the nasal mask.
A correction to account for the tubing and the exhaust port was applied. This simplified FOT was evaluated on nine patients with moderate or severe sleep apnoea during routine CPAP titration. Patient impedance measured by the simplified FOT (|Z|) was compared with actual patient impedance (|Zrs|) measured simultaneously with a reference FOT based on recording pressure and flow at the nasal mask.
An excellent agreement was found between |Z| and |Zrs| over the wide range of airway obstruction explored (4.8–72.1 cmH2O·s·L–1): |Z|=|Zrs|x0.86+1.3 cmH2O·s·L–1 (r= 0.99). Moreover, the simplified and the conventional FOT settings detected the same respiratory events during sleep.
These results demonstrate that this simplified FOT is applicable for measuring airway obstruction during routine sleep studies in patients with sleep apnoea.
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