Reference equations for tidal breathing parameters using structured light plethysmography.

ERJ Open Research
Shayan Motamedi-FakhrB G Cooper

Abstract

Tidal breathing measurements can be used to identify changes in respiratory status. Structured light plethysmography (SLP) is a non-contact tidal breathing measurement technique. Lack of reference equations for SLP parameters makes clinical decision-making difficult. We have developed a set of growth-adjusted reference equations for seven clinically pertinent parameters of respiratory rate (f R), inspiratory time (t I), expiratory time (t E), duty cycle (t I/total breath time), phase (thoraco-abdominal asynchrony (TAA)), relative thoracic contribution (RTC) and tidal inspiratory/expiratory flow at 50% volume (IE50). Reference equations were developed based on a cohort of 198 seated healthy subjects (age 2-75 years, height 82-194 cm, 108 males). We adopted the same methodological approach as the Global Lung Function Initiative (GLI) report on spirometric reference equations. 5 min of tidal breathing was recorded per subject. Parameters were summarised with their medians. The supplementary material provided is an integral part of this work and a reference range calculator is provided therein. We found predicted f R to decrease with age and height rapidly in the first 20 years and slowly thereafter. Expected t I, t E and RTC follo...Continue Reading

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