Three-dimensional optical analysis of chest wall motion

ABSTRACT:The study of respiratory mechanics in infants requires a noninvasive accurate measurement of the lung volume changes (⌬V L ). Optoelectronic plethysmography (OEP) allows the assessment of ⌬V L through the measurement of the chest wall surface motion and it has been proved to be accurate in adults. The aim of this study was to apply OEP to newborns and to validate it by comparison to pneumotachography. Twenty term and preterm newborns (GA ϭ 34 Ϯ 5 wk) in stable condition were studied during 1 to 2 min periods of quiet breathing in supine position. Airway opening flow was measured by applying a facemask connected to a pneumotachograph (PNT) and integrated to provide the ⌬V L . Chest wall volume changes were simultaneously measured by OEP. The tidal volume values measured by pneumotachography and by OEP were compared for each breath. A total of 771 breaths from all patients were considered. Bland-Altmann analysis showed a mean difference of Ϫ0.08 mL and a limit of agreement ranging from Ϫ2.98 to 2.83 mL. Linear regression analysis demonstrated good correlation between the two techniques (r 2 ϭ 0.95, q ϭ 1.00 mL, m ϭ 0.96). OEP provides accurate measurements of ⌬V L in newborns and may be useful to study respiratory mechanics and breathing patterns during spontaneous breathing and mechanical ventilation. T he study of respiratory mechanics and control of breathing ideally requires an accurate and noninvasive measurement of lung volume changes (⌬V L ) not interfering with patients' spontaneous activity. Unfortunately, the currently available methods for the measurement of ⌬V L in infants present several intrinsic and unresolved limitations.Most of the techniques require either connections to the airway opening or critical patient-and posture-dependent calibration procedures. Connecting to the airway opening may introduce leaks, annoy the infant, and affect the breathing pattern (1,2), while the use of patient-dependent calibration procedures can lead to inaccurate measurements when a patient's condition or posture changes with respect to the baseline state (3). Moreover, none of the existing techniques have proved to be reliable in tracking long-term changes in endexpiratory lung volume (EELV) due to integration drift or problems in the measurements stability (4,5).Optoelectronic plethysmography (OEP) is a noninvasive technique, which estimates chest wall volume (V CW ) by measuring the three-dimensional position of several reflective markers placed on the patient's thorax (6 -8). This technique has proved to be reliable in adults in different postures and conditions (7,8).OEP does not require a connection to the airway opening or subject-specific calibration procedures. It provides an accurate measurement of the V CW and it allows, through the use of subsets of the markers placed on the thorax, the measurement of separate compartments, such as the rib cage, abdomen, or smaller components (9). Being based on the direct measurement of chest wall volumes, OEP is not affected by integration drift and can be use...

show abstract

“…Detailed descriptions of the OEP for the analysis of the V CW in standing, seated, and supine adults have been published previously (8,11,12).…”

Section: Methodsmentioning

confidence: 99%

Measurement of Total and Compartmental Lung Volume Changes in Newborns by Optoelectronic Plethysmography

et al. 2010

View full text Add to dashboard Cite

show abstract

“…However, it is limited to measuring the anteroposterior diameters of breathing movements. Although several previous studies have assessed the 3-dimensional motions of the thorax and abdomen during breathing using infrared cameras 15,16 and an electromagnetic device, 17 there is no reported literature on the 3-dimensional distances of the observational points on the thorax and abdomen during breathing.…”

Section: Introductionmentioning

confidence: 99%

Breathing Movements of the Chest and Abdominal Wall in Healthy Subjects

2012

View full text Add to dashboard Cite

BACKGROUND: Physical assessment of breathing is an important component of physical therapy evaluations. However, there are no standardized reference values of breathing movements available for use in clinical practice. The purpose of this study was to determine the 3-dimensional distances of observational points on the thorax and abdomen during breathing in healthy subjects and to assess the effects of age, posture, and sex on breathing movements. METHODS: We studied the 3-dimensional breathing movement distances of the thorax and abdomen in 100 healthy subjects (50 males, 50 females). Breathing movements were measured with a 3-dimensional motion system during quiet and deep breathing with subjects in supine and sitting positions. Thirteen reflective markers were placed on the upper (the clavicles, 3rd ribs, and sternal angle) and lower thorax (the 8th ribs, 10th ribs, and xiphoid process) and the abdomen (upper abdomen and lateral abdomen). Range of movement in both breathing conditions was measured as the 3-dimensional distance at half respiratory cycle. Respiratory rates were calculated based on the breathing movements analyzed. One-way analysis of variance, t tests, and multiple regression were used for statistical analysis. RESULTS: The average marker distances for the thorax and abdomen during quiet breathing were less than one third of those during deep breathing. Upper thoracic movement was significantly decreased with age. There was less abdominal movement in females than in males, except during quiet breathing in the supine position. The distances between the thoracic markers were greater and those of the abdomen were less during quiet and deep breathing in the sitting position, compared with those in the supine position. CONCLUSIONS: We found that the observed breathing movements were related to the effects of age, sex, and posture. These findings are in agreement with those reported in previous studies. The results may be helpful in assessing breathing movement by physical examination.

show abstract

“…In this method, the three-dimensional positions of reflective markers placed on the thoracic-abdominal surface are tracked by a system of infrared cameras to obtain an estimation of the volume variations of the entire chest wall (CW), and the contribution of each one of its compartments. OEP can be applied in various positions: standing, sitting, supine, prone 2,6,8,12,29 . OEP has been shown to be a reliable and accurate method, and has been validated against spirometry in various conditions and populations 2,3,7,8,11,36 .…”

Section: Introductionmentioning

confidence: 99%

Chest Wall Kinematics Using Triangular Cosserat Point Elements in Healthy and Neuromuscular Subjects

et al. 2017

View full text Add to dashboard Cite

Optoelectronic plethysmography (OEP) is a noninvasive method for assessing lung volume variations and the contributions of different anatomical compartments of the chest wall (CW) through measurements of the motion of markers attached to the CW surface. The present study proposes a new method for analyzing the local CW kinematics from OEP measurements based on the kinematics of triangular Cosserat point elements (TCPEs). 52 reflective markers were placed on the anterior CW to create a mesh of 78 triangles according to an anatomical model. Each triangle was characterized by a TCPE and its kinematics was described using four time-variant scalar TCPE parameters. The total CW volume ( TCW V ) and the contributions of its six compartments were also estimated, using the same markers. The method was evaluated using measurements of ten healthy subjects, nine patients with Pompe disease, and ten patients with Duchenne muscular dystrophy (DMD), during spontaneous breathing (SB) and vital capacity maneuvers (VC) in the supine position. TCPE parameters and compartmental volumes were compared with TCW V by computing the phase angles  (for SB) and the correlation r (for VC) between them. Analysis of  and r of the outward translation parameter T P of each TCPE revealed that for healthy subjects it provided similar results to those obtained by compartmental volumes, whereas for the neuromuscular patients the TCPE method was capable of detecting local asynchronous and paradoxical movements also in cases where they were undistinguished 2 by volumes. Therefore, the TCPE approach provides additional information to OEP that may enhance its clinical evaluation capabilities.

show abstract

Three-dimensional optical analysis of chest wall motion

Cited by 120 publications

References 0 publications

Measurement of Total and Compartmental Lung Volume Changes in Newborns by Optoelectronic Plethysmography

Measurement of Total and Compartmental Lung Volume Changes in Newborns by Optoelectronic Plethysmography

Breathing Movements of the Chest and Abdominal Wall in Healthy Subjects

Chest Wall Kinematics Using Triangular Cosserat Point Elements in Healthy and Neuromuscular Subjects

Contact Info

Product

Resources

About