P37 Preliminary normal values for structured light plethysmography tidal breathing parameters and age and gender differences

• Published in: Thorax Vol. 71; no. Suppl 3; pp. A102 - A103
• Main Authors: Fakhr, S, O’Reilly, L, Wilson, R, Cooper, B, Iles, R
• Format: Journal Article
• Language: English
• Published: London BMJ Publishing Group LTD 01.12.2016
• ISSN: 0040-6376; 1468-3296; 1468-3296
• DOI: 10.1136/thoraxjnl-2016-209333.180

IntroductionThis is the first report from an ongoing study to define normal values for Structured Light Plethysmography (SLP) tidal breathing parameters in adults. Structured Light Plethysmography (SLP) is a non-contact, non-invasive respiratory measurement technology that utilises the movement of thoraco-abdominal (TA) wall to measure a range of tidal breathing parameters. Various studies have been using SLP but lack of normative values can make any clinical judgement difficult.Methods:As a part of an on-going collaboration between PneumaCare Ltd. and Queen Elizabeth (QE) Hospital (Birmingham, UK), 107 healthy adult subjects between ages of 18 to 69 were measured with SLP during 4 to 5 minutes of seated tidal breathing. Parameter means and standard deviations for males and females aged 18–39 and 40–69 were calculated and gender and age related comparisons were made (t-test).ResultsTables 1 summarises the normative values for males and females older and younger than 40 years. Three parameters showed age related differences and one parameter showed a gender related difference.ConclusionPreliminary normal values for SLP derived tidal breathing parameters are reported. Some gender and age related differences are apparent. It is interesting that tPTEF/tE was significantly lower in the older participants, possibly a sign of natural airway obstruction associated with age.Abstract P37 Table 1SLP Tidal Breathing Parameters for adult male and female normals aged 18–69 yearsParameterMales 18–39 yrs (n = 32) Mean±SDMales 40–69 yrs (n = 25) Mean ± SDYoung vs older males, t (p)Females 18–39 (n = 21) Mean ± SDFemales 40–69 yrs (n = 29) Mean ± SDYoung vs older Females, t (p)Males vs. Females (all ages), t (p)TAA 5.7 ± 23.34.75 ± 2.691.18 (0.24)4.85 ± 2.454.8 ± 1.830.08 (0.94)0.92 (0.36)LRHTA 2.24 ± 2.132.39 ± 1.64−0.298 (0.77)1.58 ± 0.692.04 ± 1.43−1.36 (0.18)1.47 (0.14)%RC 45.87 ± 13.0756.29 ± 11.03−3.2(<0.01) 60.23 ± 8.5561.31 ± 10.33−0.39 (0.70)−4.62(<0.001) IE50 1.34 ± 0.271.25 ± 0.181.48 (0.14)1.37 ± 0.21.42 ± 0.29−0.64 (0.52)−1.94 (0.06)tPTEF/tE 0.34 ± 0.090.26 ± 0.073.67(<0.001) 0.32 ± 0.090.26 ± 0.062.62(<0.05) 0.91 (0.36)tPTIF/tI 0.49 ± 0.090.55 ± 0.09−2.69(<0.01) 0.5 ± 0.080.52 ± 0.070.88 (0.38)−1.13 (0.26)TAA: Thoraco-abdominal asynchrony (TAA), LRHTA:left vs Right Hemi-thoracic asynchrony, IE50:Inspiratory to expiratory flow at 50% of tidal volume calculated from thoraco-abdominal wall displacement, tPTEF/tE: normalised time to reach peak tidal expiratory flow, tPTIF/tI: normalised time to reach peak tidal inspiratory flow