Thora-3DI™ for Evaluation of Severity of Chronic Obstructive Pulmonary Disease (COPD) (SLPCOPD)

Tidal Breathing Patterns Measured by Thora-3DI™ Structured Light Plethysmography for Evaluation of Severity of Chronic Obstructive Pulmonary Disease (COPD)

To demonstrate differences in tidal breathing patterns measured by SLP(Structured Light Plethysmography) between healthy subjects and COPD (chronic obstructive pulmonary disease). The correlation between SLP parameters and standard lung function parameters measured by body box and spirometry will also be assessed. Trends in SLP breathing patterns between the different GOLD (Global Initiative for Chronic Obstructive Lung Disease) stages of COPD, and between those and healthy subjects, will be investigated to assess whether SLP can detect differences between groups.

Structured light plethysmography (SLP) is a novel, non-contact method for assessing quiet 'tidal' breathing. A number of studies have reported the effects of conditions such as chronic obstructive pulmonary disease (COPD) on tidal breathing patterns, and a previous study has shown that SLP is able to detect differences in ten tidal breathing patterns between healthy subjects and patients with COPD. In this present study, the investigators will aim to confirm the previous findings and also to examine the relationship between SLP tidal breathing parameters and traditional measurements of lung function measured by spirometry and body box plethysmograph. The correlation between SLP parameters with lung Function parameters measured by spirometry and body box plethysmography: forced expiratory volume in one second (FEV1); Forced vital capacity (FVC), FEV1/FVC (forced expiratory volume in one second/forced vital capacity); total lung capacity (TLC) and residual volume (RV). Trends in tidal breathing patterns between varying severities of COPD (based on the (Global initiative for lung disease (GOLD) grading system.

Participants with no diagnosis of respiratory disease between the ages of 0 and 80 whose breathing will be measured using Thora-3Di structured light plethysmography, body plethysmography and spirometry.

Participants with chronic obstructive pulmonary disease between the ages of 0 and 80 whose breathing will be measured using Thora-3Di structured light plethysmography, body plethysmography and spirometry.

Difference in SLP Breath Timing indices measured in seconds and between Patients and Healthy Subjects

SLP breathing parameters derived from the movement of the thoracoabdominal (TA) wall during tidal breathing

Difference in SLP derived Relative Contribution (measured in %) between Patients and Healthy Subjects

SLP breathing parameters derived from the movement of the thoracoabdominal (TA) wall during tidal breathing that describes the contribution of a region of the thoracoabdominal wall to total displacement

SLP breathing parameters derived from the movement of the thoracoabdominal (TA) wall during tidal breathing that describes the contribution of a region of the thoracoabdominal wall to total displacement

Difference in SLP derived displacement rate derived parameters (measured in distance per second) between Patients and Healthy Subjects

SLP breathing parameters derived from the trace of displacement rate over time of the thoracoabdominal (TA) wall during tidal breathing

Difference in SLP displacement rate derived ratios between Patients and Healthy Subjects (measured in distance per second) between Patients and Healthy Subjects

SLP breathing parameters ratios derived from the trace of displacement rate over time of the thoracoabdominal (TA) wall during tidal breathing

Correlation between SLP parameters with lung Function parameters measured by spirometry and body box plethysmography ( FEV1; FEV1/FVC; TLC and RV)

SLP breathing parameters ratios derived from the trace of displacement rate over time of the thoracoabdominal (TA) wall during tidal breathing correlated with lung function measured by body plethysmography and spirometry

The trends in tidal breathing patterns between varying severities of COPD (based on the GOLD grading system).

The trends in tidal breathing patterns between varying severities of COPD as measured by the GOLD grading system.

Inclusion Criteria: Age range 18-80 years, BMI range 18-40 kg/m2 Patients diagnosed, or suspected, with COPD or normal subjects with no previous or current diagnosis of respiratory disease Exclusion Criteria: Patient unable to sit in an upright position for required period of time Patients with significant co morbidities (assessed by the clinician at screening only): Significant unilateral lung disease e.g. pneumonectomy Chest wall or spinal deformity e.g. scoliosis Obstructive sleep apnea (OSA), Apnoea hypopnoea index > 30 (if known) BMI>40 Inability to consent/comply with trial protocol Presence of an acute disease process that might interfere with test performance, e.g. Nausea, vomiting, persistent coughing)

Ghezzi M, Tenero L, Piazza M, Bodini A, Piacentini G. Structured light plethysmography: new method to evaluate expiratory flow limitation in asthmatic children. Eur Respir J. 2015;46(suppl 59):PA3641.

Hmeidi H, Chadwick E, Lenney W, et al. IE50 measured by structured light plethysmography (SLP) can differentiate between children with and without asthma, and can detect response to a bronchodilator. Am J Respir Crit Care Med. 2016;193 Meeting Abstracts:A4505.

Hmeidi H, Chadwick E, Lenney W, et al. Structured light plethysmography (SLP) can quantify abnormal breathing in children aged 2-12 admitted with acute asthma. Am J Respir Crit Care Med. 2016;193 Meeting Abstracts:A4506.

Chen Y, Xin Z, Qin C. Analysis of tidal breathing flow-volume curves in stable COPD patients. Chinese J Prac Intern Med. 2005;11:978-980.

Kostianev S, Hristova A, Iluchev D. Characteristics of tidal expiratory flow pattern in healthy people and patient with chronic obstructive pulmonary disease. Folia Med (Plovdiv). 1999;41(3):18-25.

Williams EM, Madgwick RG, Morris MJ. Tidal expired airflow patterns in adults with airway obstruction. Eur Respir J. 1998 Nov;12(5):1118-23. doi: 10.1183/09031936.98.12051118. Erratum In: Eur Respir J 1999 Jan;13(1):229.

Stick S. Measurements during tidal breathing. In: Stocks J, Sly P, Tepper R, Morgan W, eds. Infant respiratory function testing: Wiley-Liss; 1996:117-138.

Motamedi-Fakhr S, Wilson RC, Iles R. Tidal breathing patterns derived from structured light plethysmography in COPD patients compared with healthy subjects. Med Devices (Auckl). 2016 Dec 29;10:1-9. doi: 10.2147/MDER.S119868. eCollection 2017.

Poole KA, Thompson JR, Hallinan HM, Beardsmore CS. Respiratory inductance plethysmography in healthy infants: a comparison of three calibration methods. Eur Respir J. 2000 Dec;16(6):1084-90. doi: 10.1034/j.1399-3003.2000.16f11.x.

Parreira VF, Vieira DS, Myrrha MA, Pessoa IM, Lage SM, Britto RR. Optoelectronic plethysmography: a review of the literature. Rev Bras Fisioter. 2012 Nov-Dec;16(6):439-53. Epub 2012 Nov 27. English, Portuguese.

de Boer W, Lasenby J, Cameron J, Wareham R, Ahmad S, Roach C et al.SLP:a zero-contact non-invasive method for pulmonary function testing. In: Labrosse F, Zwiggelaar R, Liu Y, Tiddeman B (eds). Proceedings of the British Machine Vision Conference. Aberystwyth: BMVA Press, 2010, 85.1-12. Availble at http://www.bmva.o

Whitley E, Ball J. Statistics review 4: sample size calculations. Crit Care. 2002 Aug;6(4):335-41. doi: 10.1186/cc1521. Epub 2002 May 10.