Intrinsic parasternal electromyogram is not captured by chest wall surface recording: Techniques and post inspiratory activity

2021 ◽  
Vol 288 ◽  
pp. 103641
Author(s):  
Giovanni Tagliabue ◽  
Michael Ji ◽  
Jenny V. Suneby Jagers ◽  
Devin Dean ◽  
WooSurng Lee ◽  
...  
Keyword(s):  
Chest Wall ◽  
Wall Surface ◽  
Inspiratory Activity ◽  
Recording Techniques

scholarly journals Lung surface deformation prediction from spirometry measurement and chest wall surface motion

2016 ◽  
Vol 43 (10) ◽  
pp. 5493-5502 ◽  
Author(s):  
Joubin Nasehi Tehrani ◽  
Alistair McEwan ◽  
Jing Wang
Keyword(s):  
Chest Wall ◽  
Surface Deformation ◽  
Wall Surface ◽  
Deformation Prediction ◽  
Surface Motion

Chest wall impedance partitioned into rib cage and diaphragm-abdominal pathways

1989 ◽  
Vol 66 (1) ◽  
pp. 350-359 ◽  
Author(s):  
G. M. Barnas ◽  
K. Yoshino ◽  
D. Stamenovic ◽  
Y. Kikuchi ◽  
S. H. Loring ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Chest Wall ◽  
Viscoelastic Properties ◽  
Vital Capacity ◽  
Wall Surface ◽  
Body Plethysmography ◽  
Frequency Range ◽  
Entire Frequency Range ◽  
Rib Cage ◽  
Pressure Changes

We measured chest wall "pathway impedances" (ratios of pressure changes to rates of volume displacement at the surface) with esophageal and gastric balloons and inductance plethysmographic belts around the rib cage and abdomen during forced volume oscillations (5% vital capacity, 0.5–4 Hz) at the mouth of five relaxed, seated subjects. Volume displacements of the total chest wall surface, measured by summing the rib cage and abdominal signals, approximated measurements using volume-displacement, body plethysmography over the entire frequency range. Resistance (R) and elastance (E) of the diaphragm-abdomen pathway were several times greater than those of the rib cage pathway, except at the highest frequencies where diaphragm-abdominal E was small. R and E of the diaphragm-abdomen pathway and of the rib cage pathway showed the same frequency dependencies as that of the total chest wall: R decreased markedly as frequency increased, and E (especially in the diaphragm-abdomen) decreased at the highest frequencies. These results suggest that the chest wall can be reasonably modeled, over the frequency range studied, as a system with two major pathways for displacement. Each pathway seems to exhibit behavior that reflects nonlinear, rate-independent dissipation as well as viscoelastic properties. Impedances of these pathways are useful indexes of changes in chest wall mechanical behavior in different situations.

Effects of paralysis with pancuronium on chest wall statics in awake humans

1985 ◽  
Vol 58 (5) ◽  
pp. 1638-1645 ◽  
Author(s):  
W. R. Kimball ◽  
S. H. Loring ◽  
S. J. Basta ◽  
A. De Troyer ◽  
J. Mead
Keyword(s):  
Chest Wall ◽  
Pancuronium Bromide ◽  
Abdominal Pressure ◽  
Trained Subjects ◽  
Residual Capacity ◽  
Helium Dilution ◽  
Inspiratory Activity ◽  
Relaxation Curves ◽  
Induced Changes ◽  
Relaxation Characteristics

The influence of tonic inspiratory muscle activity on the relaxation characteristics of the chest wall, rib cage (RC), and abdominal wall (ABW) has been investigated in four highly trained subjects. Chest wall shape and volume were estimated with magnetometers. Pleural pressure (Pes) and abdominal pressure were measured with esophageal and gastric balloons, respectively. Subjects were seated reclining 30 degrees from upright, and respiratory muscle weakness was produced by pancuronium bromide until RC inspiratory capacity was decreased to 60% of control. Only minor changes were observed for Konno-Mead relaxation characteristics (RC vs. ABW) between control and paralysis. Similarly, although RC relaxation curves (RC vs. Pes) during paralysis were significantly different from control (P less than 0.05), the changes were small and not consistent. The differences between paralysis-induced changes in resting end-expiratory position of the chest wall and helium-dilution functional residual capacity (FRC) suggested changes in volume of blood within the chest wall. We conclude that 1) although tonic inspiratory activity of chest wall muscles exists, it does not significantly affect the chest wall relaxation characteristics in trained subjects; 2) submaximal paralysis produced by pancuronium bromide is likely to modify either spinal attitude or the distribution of blood between extremities and the thorax; these effects may account for the changes in FRC in other studies.

scholarly journals Chest-wall Surface Dose During Post-mastectomy Radiation Therapy, with and without Nonmagnetic Bolus: A Phantom Study

2016 ◽  
Vol 21 (2) ◽  
pp. 293-297
Author(s):  
Cheon Woong Choi ◽  
Joo Wan Hong ◽  
Cheol Soo Park ◽  
Jae Ouk Ahn
Keyword(s):  
Radiation Therapy ◽  
Chest Wall ◽  
Phantom Study ◽  
Surface Dose ◽  
Wall Surface

Evaluating kinect V1 and V2 for chest wall surface scanning and assessment

2019 ◽  
Author(s):  
Nahom Kidane ◽  
Mohammad F. Obeid ◽  
Cierra Hall ◽  
Ntiana Sakioti ◽  
Robert E. Kelly ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Chest Wall ◽  
Human Study ◽  
Ct Scanning ◽  
Wall Surface ◽  
Surface Scanning ◽  
Vitro Experiment ◽  
Optical Scanning ◽  
In Vitro Experiment

"Optical scanning has proven to be advantageous to objectively assess the severity of chest wall deformities and the effectiveness of its treatment. By potentially eliminating the need for computed tomography (CT) scanning and superseding manual measurements that are subject to errors, a system that utilizes optical scanning presents great value to patients and practitioners. This work aims to investigate and evaluate the performance of two off-the-shelf optical scanning sensors in the context of their utility and accuracy to measure the severity of chest wall deformities. An in-vitro experiment and a human study are conducted utilizing both sensors to collect data and report the findings."

Effects of chest wall counterpressures on lung mechanics under high levels of CPAP in humans

1997 ◽  
Vol 83 (2) ◽  
pp. 591-598 ◽  
Author(s):  
Maurice Beaumont ◽  
Damien Lejeune ◽  
Henri Marotte ◽  
Alain Harf ◽  
Frédéric Lofaso
Keyword(s):  
Chest Wall ◽  
Muscle Activity ◽  
Lung Mechanics ◽  
Transdiaphragmatic Pressure ◽  
Expiratory Muscle ◽  
Pressure Time ◽  
Gastric Pressure ◽  
Inspiratory Activity ◽  
High Level ◽  
Respiratory Muscle Activity

Beaumont, Maurice, Damien Lejeune, Henri Marotte, Alain Harf, and Frédéric Lofaso. Effects of chest wall counterpressures on lung mechanics under high levels of CPAP in humans. J. Appl. Physiol. 83(2): 591–598, 1997.—We assessed the respective effects of thoracic (TCP) and abdominal/lower limb (ACP) counterpressures on end-expiratory volume (EEV) and respiratory muscle activity in humans breathing at 40 cmH2O of continuous positive airway pressure (CPAP). Expiratory activity was evaluated on the basis of the inspiratory drop in gastric pressure (ΔPga) from its maximal end-expiratory level, whereas inspiratory activity was evaluated on the basis of the transdiaphragmatic pressure-time product (PTPdi). CPAP induced hyperventilation (+320%) and only a 28% increase in EEV because of a high level of expiratory activity (ΔPga = 24 ± 5 cmH2O), contrasting with a reduction in PTPdi from 17 ± 2 to 9 ± 7 cmH2O ⋅ s−1 ⋅ cycle−1during 0 and 40 cmH2O of CPAP, respectively. When ACP, TCP, or both were added, hyperventilation decreased and PTPdi increased (19 ± 5, 21 ± 5, and 35 ± 7 cmH2O ⋅ s−1 ⋅ cycle−1, respectively), whereas ΔPga decreased (19 ± 6, 9 ± 4, and 2 ± 2 cmH2O, respectively). We concluded that during high-level CPAP, TCP and ACP limit lung hyperinflation and expiratory muscle activity and restore diaphragmatic activity.

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