A portable forced oscillation device for respiratory home monitoring

The increase in the prevalence of chronic respiratory diseases has resulted in a rise in health services provided at home. The forced oscillation technique (FOT) proves to be a useful tool when it is desired to assess lung function noninvasively, and particularly for patients in whom spirometry cannot be applied. As no portable FOT device is currently available, the aim of this study was to design and test a portable FOT system for ambulatory and home care applications. The system devised is based on a microprocessor, which allows online computation of respiratory resistance (Rrs) and reactance (Xrs) and reliability indices. The portable device was compared with a conventional FOT system by using signals from 14 patients with chronic respiratory disease. This device has the same computation capabilities and flexibility as conventional FOT systems and meets the requirements for home application. Rrs (14.2±6.0 cmH2O·s·L−1, mean±sd) and Xrs (−5.3±2.7 cmH2O·s·L−1) measured at 5 Hz by the portable system virtually coincided with those computed with the reference conventional FOT system: mean differences±sd were 0.074±0.025 and 0.005±0.009 cmH2O·s·L−1, respectively. This portable forced oscillation technique device could be a useful tool for monitoring respiratory mechanics in ambulatory and home care applications.

[1]  H Lorino,et al.  Cognitive function and assessment of lung function in the elderly. , 1995, American journal of respiratory and critical care medicine.

[2]  D. Navajas,et al.  Evaluation of a simplified oscillation technique for assessing airway obstruction in sleep apnoea. , 2001, The European respiratory journal.

[3]  D. Navajas,et al.  Oscillatory resistance measured during noninvasive proportional assist ventilation. , 2001, American journal of respiratory and critical care medicine.

[4]  D. Navajas,et al.  Clinical application of the forced oscillation technique for CPAP titration in the sleep apnea/hypopnea syndrome. , 1999, American journal of respiratory and critical care medicine.

[5]  Alan D. Lopez,et al.  Alternative projections of mortality and disability by cause 1990–2020: Global Burden of Disease Study , 1997, The Lancet.

[6]  D. Navajas,et al.  Analog circuit for real-time computation of respiratory mechanical impedance in sleep studies , 1997, IEEE Transactions on Biomedical Engineering.

[7]  G. Hripcsak,et al.  Internet-based home asthma telemonitoring: can patients handle the technology? , 2000, Chest.

[8]  D. Navajas,et al.  Noninvasive assessment of respiratory resistance in severe chronic respiratory patients with nasal CPAP. , 2000, The European respiratory journal.

[9]  P. Macklem,et al.  Homeokinesis and short-term variability of human airway caliber. , 2001, Journal of applied physiology.

[10]  Rosa M. Badia,et al.  Assessment of airflow obstruction during CPAP by means of forced oscillation in patients with sleep apnea. , 1998, American journal of respiratory and critical care medicine.

[11]  D. Navajas,et al.  Forced oscillation technique for the evaluation of severe sleep apnoea/hypopnoea syndrome: a pilot study. , 1998, The European respiratory journal.

[12]  Buist As.  Standardization of spirometry. , 1987 .

[13]  John L. Hankinson,et al.  Standardization of Spirometry, 1994 Update. American Thoracic Society. , 1995, American journal of respiratory and critical care medicine.

[14]  E D Michaelson,et al.  Pulmonary mechanics by spectral analysis of forced random noise. , 1975, The Journal of clinical investigation.

[15]  D. Navajas,et al.  Inspiratory dynamic obstruction detected by forced oscillation during CPAP. A model study. , 1997, American journal of respiratory and critical care medicine.

[16]  J. Charpin,et al.  Bronchoconstrictor effects of a deep inspiration in patients with asthma. , 1975, The American review of respiratory disease.

[17]  N. Ambrosino,et al.  Long-term home care programmes may reduce hospital admissions in COPD with chronic hypercapnia. , 1996, The European respiratory journal.

[18]  Susan Dumps,et al.  A model study. , 1988, Nursing standard (Royal College of Nursing (Great Britain) : 1987).

[19]  D. Altman,et al.  STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENT , 1986, The Lancet.