Real-time chest-wall-motion tracking by a single optical fibre grating:a prospective method for ventilator triggering

Ivanović, M D, Petrovic, J, Savić, A, Gligorić, G, Miletić, M, Vukčević, M, Bojović, B, Hadžievski, Lj, Allsop, T and Webb, D J (2018). Real-time chest-wall-motion tracking by a single optical fibre grating:a prospective method for ventilator triggering. Physiological Measurement, 39 (4),

Abstract

Objective: The ventilators involved in non-invasive mechanical ventilation commonly provide ventilator support via a facemask. The interface of the mask with a patient promotes air leaks that cause errors in the feedback information provided by a pneumatic sensor and hence patient-ventilator asynchrony with multiple negative consequences. Our objective is to test the possibility of using chest-wall motion measured by an optical fibre-grating sensor as a more accurate non-invasive ventilator triggering mechanism. Approach: The basic premise of our approach is that the measurement accuracy can be improved by using a triggering signal that precedes pneumatic triggering in the neuro-ventilatory coupling sequence. We propose a technique that uses the measurement of chest-wall curvature by a long-period fibre-grating sensor. The sensor was applied externally to the rib-cage and interrogated in the lateral (edge) filtering scheme. The study was performed on 34 healthy volunteers. Statistical data analysis of the time lag between the fibre-grating sensor and the reference pneumotachograph was preceded by the removal of the unwanted heartbeat signal by wavelet transform processing. Main results: The results show a consistent fibre-grating signal advance with respect to the standard pneumatic signal by (230  ±  100) ms in both the inspiratory and expiratory phases. We further show that heart activity removal yields a tremendous improvement in sensor accuracy by reducing it from 60 ml to 0.3 ml. Significance: The results indicate that the proposed measurement technique may lead to a more reliable triggering decision. Its imperviousness to air leaks, non-invasiveness, low-cost and ease of implementation offer good prospects for applications in both clinical and homecare ventilation.

Publication DOI: https://doi.org/10.1088/1361-6579/aab7ac
Divisions: Engineering & Applied Sciences > Institute of Photonics
Engineering & Applied Sciences > Electrical, electronic & power engineering
Additional Information: ©2018 IOP Publishing Ltd. M D Ivanović et al 2018 Physiol. Meas. 39 045009
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Related URLs: http://iopscien ... 579/aab7ac/meta (Publisher URL)
Published Date: 2018-04-26
Authors: Ivanović, M D
Petrovic, J
Savić, A
Gligorić, G
Miletić, M
Vukčević, M
Bojović, B
Hadžievski, Lj
Allsop, T
Webb, D J ( 0000-0002-5495-1296)

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