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Sensors 2013, 13(11), 15846-15860; doi:10.3390/s131115846
Article

Development and Evaluation of an Improved Technique for Pulmonary Function Testing Using Electrical Impedance Pneumography Intended for the Diagnosis of Chronic Obstructive Pulmonary Disease Patients

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Received: 8 September 2013 / Revised: 22 October 2013 / Accepted: 12 November 2013 / Published: 21 November 2013
(This article belongs to the Special Issue Biomedical Sensors and Systems)
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Abstract

Spirometry is regarded as the only effective method for detecting pulmonary function test (PFT) indices. In this study, a novel impedance pulmonary function measurement system (IPFS) is developed for directly assessing PFT indices. IPFS can obtain high resolution values and remove motion artifacts through real-time base impedance feedback. Feedback enables the detection of PFT indices using only both hands for convenience. IPFS showed no differences in the sitting, supine, and standing postures during the measurements, indicating that patient posture has no effect on IPFS. Mean distance analysis showed good agreement between the volume and flow signal of IPFS (p < 0.05). PFT indices were detected in subjects to differentiate a chronic obstructive pulmonary disease (COPD) patient group from a normal group. The forced vital capacity (FVC), forced expiratory volume in the first second (FEV1), FEV1/FVC, and peak expiratory flow (PEF) in the COPD group were lower than those in the normal group by IPFS (p < 0.05). IPFS is therefore suitable for evaluating pulmonary function in normal and COPD patients. Moreover, IPFS could be useful for periodic monitoring of existing patients diagnosed with obstructive lung disease.
Keywords: spirometry; pulmonary function test; chronic obstructive pulmonary disease; impedance technique; both hands spirometry; pulmonary function test; chronic obstructive pulmonary disease; impedance technique; both hands
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sim, M.H.; Kim, M.Y.; Jeong, I.C.; Park, S.B.; Yong, S.J.; Kim, W.K.; Yoon, H.R. Development and Evaluation of an Improved Technique for Pulmonary Function Testing Using Electrical Impedance Pneumography Intended for the Diagnosis of Chronic Obstructive Pulmonary Disease Patients. Sensors 2013, 13, 15846-15860.

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