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Biomedical Instrumentation & Technology 2005
Review
Topics: Electrodes; Equipment Design; Equipment Failure Analysis; Oximetry; Plethysmography
PubMed: 16248444
DOI: 10.2345/0899-8205(2005)39[367:P]2.0.CO;2 -
Current Problems in Dermatology 1999
Review
Topics: Humans; Muscle, Skeletal; Photoplethysmography; Plethysmography; Vascular Resistance; Venous Insufficiency; Venous Pressure
PubMed: 10547735
DOI: 10.1159/000060635 -
International Angiology : a Journal of... Mar 1995
Review
Topics: Air; Humans; Leg; Plethysmography; Postoperative Complications; Regional Blood Flow; Thrombophlebitis; Venous Insufficiency
PubMed: 7658103
DOI: No ID Found -
Current Opinion in Clinical Nutrition... Nov 2005Air-displacement plethysmography holds promise as an alternative to more traditional body composition techniques, although our understanding of air-displacement... (Review)
Review
PURPOSE OF REVIEW
Air-displacement plethysmography holds promise as an alternative to more traditional body composition techniques, although our understanding of air-displacement plethysmography is less than complete. Specifically, factors that influence its validity and application in certain populations, for example children, the obese, and athletes, must be better understood. This review will summarize recent findings on the validity and precision of air-displacement plethysmography and will focus primarily on papers published since 2004, with particular attention on its use in infants.
RECENT FINDINGS
The most significant recent findings in the air-displacement plethysmography literature are mechanistic in nature specifically dealing with measurement issues such as heat, moisture, clothing, and recently, inter-device variability.
SUMMARY
It is important to recognize that air-displacement plethysmography can be a practical instrument in the evaluation of body composition in a wide range of populations. Therefore, based on the body of literature that has emerged, air-displacement plethysmography appears to be a suitable and reliable instrument in the assessment of body composition. Of particular interest is its use in pediatric and obese individuals, areas requiring further study. Research is also needed to help us better understand sources of measurement error.
Topics: Adipose Tissue; Body Composition; Humans; Obesity; Plethysmography; Predictive Value of Tests; Reproducibility of Results; Sensitivity and Specificity
PubMed: 16205463
DOI: 10.1097/01.mco.0000171127.44525.07 -
Annual International Conference of the... Jul 2022The study of plethysmography time series is crucial to better understand the breathing behavior of mice, in particular the influence of neurotoxins on the respiratory...
The study of plethysmography time series is crucial to better understand the breathing behavior of mice, in particular the influence of neurotoxins on the respiratory system. Current approaches rely on a few respiratory descriptors computed on individual breathing cycles that fail to account for the variety of breathing habits and their evolution with time. In this paper we introduce a new procedure for the automatic analysis of plethysmography signals. Our method relies on a new and robust segmentation of respiratory cycles and a DTW-based clustering algorithm to extract the most typical respiratory cycles (called reference sequences). We can then create a symbolic representation of any new recording by matching respiratory cycles to their closest reference sequence. This new representation is a visual and quantitative tool to assess the breathing behavior of mice and its evolution with time. Our method is applied to plethysmography signals collected on mice with two different genotypes and exposed to a neurotoxin. Clinical relevance This article proposes a novel approach to study plethysmography data. Our algorithm is able to accurately extract clinically meaningful respiratory cycles and the associated ventilation patterns descriptors such as tidal volume and inhalation/exhalation duration. In addition, thanks to the associated symbolic representation of signals, the temporal evolution of respiration is easily quantified. This opens a new research path to study the often slowly evolving and subtle influence of neurotoxins on the respiratory system.
Topics: Cluster Analysis; Neurotoxins; Plethysmography; Respiration; Tidal Volume
PubMed: 36086653
DOI: 10.1109/EMBC48229.2022.9870907 -
Biomedical Engineering Sep 1974
Topics: Blood Volume; Cardiac Output; Electrodes; Electronics, Medical; Evaluation Studies as Topic; Humans; Online Systems; Photometry; Plethysmography; Plethysmography, Impedance; Regional Blood Flow
PubMed: 4415104
DOI: No ID Found -
Health Technology Assessment 1996Plethysmography, a semiquantitative method of measuring segmental blood flow and velocity in the carotid and peripheral vascular systems, is safe, easy to perform, and... (Review)
Review
Plethysmography, a semiquantitative method of measuring segmental blood flow and velocity in the carotid and peripheral vascular systems, is safe, easy to perform, and inexpensive. Impedance, strain guage, air, and photoelectric plethysmographic methods are assessed in this publication for their relative safety, efficacy, and clinical utility in diagnosing vascular disease. Clinical evidence has demonstrated, for example, that oculoplethysmography is not a reliable screening test for carotid artery disease, particularly in bilateral disease and nonocclusive unilateral disease. Oculoplethysmography is thus no longer recommended for the diagnosis of carotid artery disease. Impedance, strain guage, and photoplethysmography methods can be used for the initial evaluation of acute and chronic venous insufficiency, although there is great variability in the reliability of these tests to predict venous disease in the presence of nonobstructive thrombi and comorbid conditions. Strain guage and photoelectric plethysmography can be safely used for the evaluation of peripheral arterial disease. But surgical candidates for arterial reconstruction and some venous disorders may require additional imaging such as duplex ultrasound, venography, or arteriography for anatomic information that is not elucidated by plethysmography. The plethysmographic techniques reviewed in this assessment, evaluating the ability to predict the presence of flow reduction in the carotid and peripheral circulations, are based on the technical performance of the tests as compared with a reference method. Establishing evidence-based conclusions proved difficult in light of biases such as nonrandomization, unstated patient selection criteria, poor followup of patients, and lack of blindness in some studies.
Topics: Humans; Mass Screening; Plethysmography; Reproducibility of Results; Safety; Sensitivity and Specificity; Technology Assessment, Biomedical; Treatment Outcome; Vascular Diseases
PubMed: 8724636
DOI: No ID Found -
Biomedical Engineering Sep 1975
Review
Topics: Air; Electronics, Medical; Gravitation; Humans; Hydrostatic Pressure; Mercury; Photography; Plethysmography; Plethysmography, Impedance; Water
PubMed: 1100127
DOI: No ID Found -
Clinical Physiology and Functional... Sep 2011New advances in computer processing and imaging have allowed the development of innovative techniques to assess lung function. A promising methodology is optoelectronic... (Review)
Review
New advances in computer processing and imaging have allowed the development of innovative techniques to assess lung function. A promising methodology is optoelectronic plethysmography (OEP). OEP evaluates ventilatory kinematics through the use of infrared imaging. Markers are placed, and images read on the chest, back and abdomen of subjects. Currently, this system is used mainly in research settings, but in the future may have broad applicability to patient populations such as very young children, patients with neuromuscular disease and patients who cannot be tested with classical spirometry testing. This paper presents the history and development of OEP, along with a summary of the OEP methodology, a discussion of research findings and results to date, as well as application and limitations.
Topics: Biomechanical Phenomena; Calibration; History, 20th Century; History, 21st Century; Humans; Infrared Rays; Lung; Lung Diseases; Plethysmography; Predictive Value of Tests; Pulmonary Ventilation; Reproducibility of Results; Respiratory Function Tests; Respiratory Mechanics; Signal Processing, Computer-Assisted
PubMed: 21771250
DOI: 10.1111/j.1475-097X.2011.01028.x -
Current Opinion in Clinical Nutrition... Jan 2004This review will focus chiefly on recently published studies utilizing air-displacement plethysmography (i.e. BOD POD) in geriatric populations. This innovative... (Review)
Review
PURPOSE OF REVIEW
This review will focus chiefly on recently published studies utilizing air-displacement plethysmography (i.e. BOD POD) in geriatric populations. This innovative technology has been available commercially since 1995. As the test procedure is relatively easy to perform and quick, it may provide an improvement in body composition testing, especially in older individuals with poor ambulation and health.
RECENT FINDINGS
This review will explain in a concise and detailed manner the underlying principles of air-displacement plethysmography specifically related to the BOD POD. Second, it will review the studies using this new technology in comparison with more commonly used techniques (hydrostatic weighing, dual energy X-ray absorptiometry, deuterium oxide, multi-compartmental models) for body composition analysis in geriatric populations. Third, it will provide a direction for future studies.
SUMMARY
A review of the current body of literature in which air-displacement plethysmography was used is beginning to emerge with a clear picture. Although this technique is still new, it appears that air-displacement plethysmography is a valid and reliable alternative to more traditional body composition techniques, as indicated by small mean differences between techniques. This has special implications in a geriatric population because traditional techniques are difficult to perform in individuals with joint pain, ambulation issues, and overall poor health.
Topics: Absorptiometry, Photon; Adipose Tissue; Aged; Aging; Body Composition; Female; Humans; Male; Plethysmography
PubMed: 15090897
DOI: 10.1097/00075197-200401000-00003