Med Biol Eng Comput - Assessment of respiratory flow and efforts using upper-body acceleration.


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In this paper, an innovative method for estimating the respiratory flow and efforts is proposed and evaluated in various postures and flow rates. Three micro electro-mechanical system accelerometers were mounted on the suprasternal notch, thorax and abdomen of subjects in supine, prone and lateral positions to record the upper airway acceleration and the movements of the chest and abdomen wall. The respiratory flow and efforts were estimated from the recorded acceleration signals by applying machine learning methods. To assess the agreement of the estimated signals with the well-established measurement methods, standard error of measurement (SEM) was calculated and =1-SEM was estimated for every condition. A significant agreement between the estimated and reference signals was found (=0.83, 0.82 and 0.89 for the estimated flow, thorax and abdomen efforts respectively). Additionally, the agreement of the estimated and reference flows was assessed by calculating the ratio of time at the tidal peak inspiration flow to the inspiration time (tPTIF/tI) and the ratio of time at the tidal peak expiration flow to the expiration time (tPTEF/tE). Overall mean and standard deviation of absolute value of differences between tPTIF/tI and tPTEF/tE ratios calculated for every breathing cycle of reference and estimated flow were 0.0035 (0.06) and 0.051 (0.032), respectively. The presented results demonstrate the feasibility of using the upper-body acceleration as a simple solution for long-term monitoring of respiratory features.

Resumo Limpo

paper innov method estim respiratori flow effort propos evalu various postur flow rate three micro electromechan system acceleromet mount suprastern notch thorax abdomen subject supin prone later posit record upper airway acceler movement chest abdomen wall respiratori flow effort estim record acceler signal appli machin learn method assess agreement estim signal wellestablish measur method standard error measur sem calcul sem estim everi condit signific agreement estim refer signal found estim flow thorax abdomen effort respect addit agreement estim refer flow assess calcul ratio time tidal peak inspir flow inspir time tptifti ratio time tidal peak expir flow expir time tpteft overal mean standard deviat absolut valu differ tptifti tpteft ratio calcul everi breath cycl refer estim flow respect present result demonstr feasibl use upperbodi acceler simpl solut longterm monitor respiratori featur

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