Physiological data were obtained with the technical assistance of the monitoring system vendor. Patient monitors (Component Monitoring System Intellivue MP-70; Philips Healthcare) were located by every ICU patient bed. Each monitor acquired and digitized multiparameter physiological data; processed the signals to derive time series (trends) of clinical measures such as heart rate, blood pressures, and oxygen saturation, etc; and also produced bedside monitor alarms. Those data were all transmitted to a networked nursing central station within each ICU (M3155 Intellivue Information Center; Philips Healthcare). The physiological waveforms (such as electrocardiogram, blood pressures, pulse plethysmograms, respirations) were sampled at 125 Hz, and trend data were updated each minute. The data were subsequently stored temporarily in a central database server that typically supported several ICUs. A customized archiving agent, developed through collaboration with Philips Health-care, created permanent copies of the physiological data residing in central database servers. The data were physically transported from the hospital to the laboratory every 2 to 4 wks where they were deidentified, converted to an open source data format (6 ), and incorporated into the MIMIC II waveform database. Limited capacity and intermittent failures of the archiving agents restricted waveform collection to a fraction (15%) of the monitored ICU beds (Table 2 ). No attempt was made to assure that the ICU records with waveform/trend data were statistically representative of the database as a whole.
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Plethysmography
Plethysmography
Plethysmography is a non-invasive technique used to measure changes in the volume of an organ or body part, often the lungs or limbs.
It is commonly used to assess respiratory function, vascular dynamics, and other physiological processes.
Plethysmography provides valuable insights into the mechanics of breathing, blood flow, and tissue properties, supporting a wide range of clinical and research applications.
This technique involves monitoring the expansion and contraction of body parts, typically using a specialized chamber or sensor that detects volume changes.
Plethysmography has proven to be a reliable and versatile tool for evaluating respiratory and cardiovascular health, and continues to be an important method in the field of physiology and medicine.
Despcription typo: 'Despcription' instead of 'Description'.
It is commonly used to assess respiratory function, vascular dynamics, and other physiological processes.
Plethysmography provides valuable insights into the mechanics of breathing, blood flow, and tissue properties, supporting a wide range of clinical and research applications.
This technique involves monitoring the expansion and contraction of body parts, typically using a specialized chamber or sensor that detects volume changes.
Plethysmography has proven to be a reliable and versatile tool for evaluating respiratory and cardiovascular health, and continues to be an important method in the field of physiology and medicine.
Despcription typo: 'Despcription' instead of 'Description'.
Most cited protocols related to «Plethysmography»
Electrocardiogram
Oxygen Saturation
Patient Monitoring
Patients
physiology
Plethysmography
Pulse Rate
Rate, Heart
Respiration
The study was conducted in the preoperative clinics of Toronto Western Hospital and Mount Sinai Hospital, Toronto, Ontario, Canada. Institutional Review Board approvals were obtained from both institutions (MSH: 06-0143-E and 07-0183-E; UHN: 06-0135-AE and 07-0515-AE). Patients aged 18 yr or older, who were ASA I–IV, and were undergoing elective procedures in general surgery, gynaecology, orthopaedics, urology, plastic surgery, ophthalmology, or spinal surgery were included in the screening process and approached for consent by the research assistants for the preoperative polysomnograpy (PSG). Patients who were unwilling or unable to give informed consent or patients who were expected to have abnormal EEG findings (e.g. brain tumour, epilepsy surgery, patients with deep brain stimulator) were excluded.
All the patients were asked to complete the STOP questionnaire.11 (link) Information concerning BMI, age, neck circumference, and gender (Bang) were collected by a research assistant. In the initial 2 yr period of the study, the patients were invited to undergo a laboratory PSG. During the subsequent 2 yr of the study, the patients underwent a portable PSG study at home. The results of the PSG were used to evaluate the various scores of the STOP-Bang questionnaire.
The portable PSG was performed with a level 2 portable sleep device (Embletta X100) which is shown to be a reliable alternative for standard PSG in surgical patients.14 The PSG recordings were performed at the patients’ home. The recording montage consisted of two EEG channels (C3 and C4), electrooculogram (left or right), and chin muscle EMGs. Thoracic and abdominal respiratory effort bands, body position sensors, and pulse oximeter were also used.
The device was attached to patients by a well-trained PSG technician at their home and the overnight recordings were unattended. The patients were advised on how to remove the device which was picked up the next morning from the patients’ home by the same sleep technician. A certified PSG technologist who was blinded to the study information analysed the PSG. The manual scoring was performed using Somnologia Studio 5.0 as the scoring platform. Manual scoring was performed according to the Manual of the American Academy of Sleep Medicine.15 The laboratory PSG was performed overnight and patients went to bed at their usual bedtime. A standard EEG montage consisting of EEG, electrooculogram, submental EMG, and ECG obtained with surface electrodes were used to collect the sleep architectural data. A pulse oximeter measured the oxygen saturation. Additional recordings included the respiratory effort by thoraco-abdominal excursion, respiratory inductive plethysmography, and oronasal airflow.
A certified polysomnographic technologist scored the polysomnographic recordings under the supervision of a sleep physician who assessed and approved the reports. The technologist was blinded to the results of the STOP-Bang questionnaire and other clinical information about the patients. The sleep stages and apnoea–hypopnea index (AHI) were scored according to the American Academy of Sleep Medicine Task Force recommendations.16 (link)The diagnosis of OSA was based on an AHI >5 with fragmented sleep and daytime sleepiness. The severity of OSA with both laboratory and portable PSG was classified based on the AHI values: >5–15 as mild OSA, >15–30 as moderate OSA, and >30 as severe OSA.15 16 (link)
All the patients were asked to complete the STOP questionnaire.11 (link) Information concerning BMI, age, neck circumference, and gender (Bang) were collected by a research assistant. In the initial 2 yr period of the study, the patients were invited to undergo a laboratory PSG. During the subsequent 2 yr of the study, the patients underwent a portable PSG study at home. The results of the PSG were used to evaluate the various scores of the STOP-Bang questionnaire.
The portable PSG was performed with a level 2 portable sleep device (Embletta X100) which is shown to be a reliable alternative for standard PSG in surgical patients.14 The PSG recordings were performed at the patients’ home. The recording montage consisted of two EEG channels (C3 and C4), electrooculogram (left or right), and chin muscle EMGs. Thoracic and abdominal respiratory effort bands, body position sensors, and pulse oximeter were also used.
The device was attached to patients by a well-trained PSG technician at their home and the overnight recordings were unattended. The patients were advised on how to remove the device which was picked up the next morning from the patients’ home by the same sleep technician. A certified PSG technologist who was blinded to the study information analysed the PSG. The manual scoring was performed using Somnologia Studio 5.0 as the scoring platform. Manual scoring was performed according to the Manual of the American Academy of Sleep Medicine.15 The laboratory PSG was performed overnight and patients went to bed at their usual bedtime. A standard EEG montage consisting of EEG, electrooculogram, submental EMG, and ECG obtained with surface electrodes were used to collect the sleep architectural data. A pulse oximeter measured the oxygen saturation. Additional recordings included the respiratory effort by thoraco-abdominal excursion, respiratory inductive plethysmography, and oronasal airflow.
A certified polysomnographic technologist scored the polysomnographic recordings under the supervision of a sleep physician who assessed and approved the reports. The technologist was blinded to the results of the STOP-Bang questionnaire and other clinical information about the patients. The sleep stages and apnoea–hypopnea index (AHI) were scored according to the American Academy of Sleep Medicine Task Force recommendations.16 (link)The diagnosis of OSA was based on an AHI >5 with fragmented sleep and daytime sleepiness. The severity of OSA with both laboratory and portable PSG was classified based on the AHI values: >5–15 as mild OSA, >15–30 as moderate OSA, and >30 as severe OSA.15 16 (link)
Abdomen
Apnea
Brain
Brain Neoplasms
Chin
Conditioning, Psychology
Diagnosis
Electrooculograms
Epilepsy
Ethics Committees, Research
Gender
Medical Devices
Muscle Tissue
Neck
Operative Surgical Procedures
Orthopedic Surgical Procedures
Oxygen Saturation
Patients
Pharmaceutical Preparations
Physicians
Plastic Surgical Procedures
Plethysmography
Pulse Rate
Respiratory Rate
Sleep
Sleep Stages
Supervision
Cloning Vectors
Consciousness
Exhaling
Humidity
Inhalation
Mus
Plethysmography
Plethysmography, Whole Body
Pressure
Respiratory Rate
Tidal Volume
Multifrequency bioelectrical impedance analysis (BIA) [229 (link), 230 (link)] is found as one of the core interest among the researchers in the field of bioelectrical impedance. A part of the researchers are studying on the instrumentation who are developing more sophisticated instrumentation. The future studies may be conducted on the wireless and Bluetooth based instrumentation for BIA techniques. Among the multifrequency impedance analyzing techniques EIS is the most popular and strong method. EIS methods are now being studied with a pulsed signal based EIS instrumentation [231 (link)–233 (link)] for tissue characterizations as well as single cell analysis [231 (link)–233 (link)]. The wireless and Bluetooth based instrumentation for EIS techniques can also be implemented in future studies. Presently the IPG is being studied for finger plethysmography [234 (link), 235 (link)] by J. G. Webster group in University of Wisconsin, Madison, USA. J. G. Webster group is also working on the automated IPG instrumentation and the modern software based IPG systems [236 –238 ]. In future, the wireless and Bluetooth based instrumentation for IPG techniques can also be implemented. ICG has several advantages in cardiac parameter assessment over the other conventional invasive methods. In recent years the ICG instruments are available from few industry-institute research collaborations. ICG can be studied as multifrequency bioimpedance methods for transthoracic parameter assessment for better cardiac health monitoring. ICG can also be studied as an ambulatory monitoring or long-term monitoring modality in intensive care unit (ICU). The electrical behavior of biological tissue is very complex, and hence, though the BIA, EIS, IPG, ICG are found with some successful applications, yet the EIT has not yet been considered as the regular medical imaging modality. Nonlinearity, ill-posedness, modelling error, measurement error, and other challenges are still required to be overcome. But, due to some unique advantages, if these challenges are overcome by future research on EIT, it may be also applied more effectively and efficiently compared to the other imaging modalities which are now being commonly used in some particular medical applications like brain imaging [239 –241 ], breast imaging [242 –249 (link)], abdominal imaging [250 (link)–252 ], whole body imaging [253 (link)–256 (link)], and so forth. Therefore, the EIT technology has a lot of potentials for low cost fast tomographic imaging, though the problems of low spatial resolution and poor signal to noise ration of the system should be solved in future research. Absolute conductivity imaging, better electrode performance, accurate system modelling, and high speed 3D EIT are also to be explored more to improve the EIT technology.
Abdomen
Bioelectrical Impedance
Biopharmaceuticals
Brain
Breast
Electric Conductivity
Electricity
Fingers
Heart
Plethysmography
Single-Cell Analysis
Tissues
Tomography
5'-N-methylcarboxamideadenosine
Animals
Apoptosis
Bacteria
Blood
Bronchoalveolar Lavage
Cells
DNA, Bacterial
Eyelashes
Flow Cytometry
Head
Immune Sera
Institutional Animal Care and Use Committees
Leukocytes
Light Microscopy
Lung
Macrophage
Middle Ear
MUC5AC protein, human
MUC5B protein, human
Mus
neuro-oncological ventral antigen 2, human
Neutrophil
Otitis Media
Otoscopy
Oxygen
Pellets, Drug
Plethysmography
Pneumonia
prisma
Proteins
Pulse Rate
Rabbits
Respiratory Physiology
RNA, Ribosomal, 16S
Staphylococcus aureus
Most recents protocols related to «Plethysmography»
Participants wore a photoplethysmography WHOOP wristband67 (link) for the whole study period (Week 1 through Week 7) to assess changes in sleep hours and sleep-derived HRV. WHOOP algorithms have been validated as having a 95% sensitivity for sleep, 68% sensitivity for deep sleep and 70% for REM sleep68 (link). Participants were instructed to wear the waterproof wristband as much as possible and especially during sleep.
Saliva samples for cortisol awakening response were collected only for younger adults to reduce participant burden for older adults. We instructed younger participants to collect saliva samples using oral swabs both upon awakening and 30 min later. Saliva was collected in the morning on Week 2 and 7 and brought to the lab in a thermos with ice packs. Samples were stored at −20 °C until they were sent to Salimetrics (CA, USA) for cortisol assays.
During Weeks 2 and 7 visits, we obtained resting heart rate data by having participants sit in a chair for five minutes. Using HeartMath emWave Pro software and its infrared pulse plethysmograph (PPG) ear sensor, the heartbeat was sampled at 370 Hz and its inter-beat interval data was recorded after removing artifacts. The data for each participant was analyzed with Kubios HRV Premium Version 3.1 to obtain a mean heart rate and root mean squared successive difference.
Saliva samples for cortisol awakening response were collected only for younger adults to reduce participant burden for older adults. We instructed younger participants to collect saliva samples using oral swabs both upon awakening and 30 min later. Saliva was collected in the morning on Week 2 and 7 and brought to the lab in a thermos with ice packs. Samples were stored at −20 °C until they were sent to Salimetrics (CA, USA) for cortisol assays.
During Weeks 2 and 7 visits, we obtained resting heart rate data by having participants sit in a chair for five minutes. Using HeartMath emWave Pro software and its infrared pulse plethysmograph (PPG) ear sensor, the heartbeat was sampled at 370 Hz and its inter-beat interval data was recorded after removing artifacts. The data for each participant was analyzed with Kubios HRV Premium Version 3.1 to obtain a mean heart rate and root mean squared successive difference.
Aged
Biological Assay
Hydrocortisone
Hypersensitivity
Photoplethysmography
Plant Roots
Plethysmography
Pulse Rate
Rate, Heart
Saliva
Sleep
Sleep, Slow-Wave
Young Adult
Youth
Besides the daily prebronchodilator spirometry tests, postbronchodilator spirometry, body plethysmography, diffusing capacity and respiratory muscle strength will be recorded at baseline and outcome assessment as part of routine clinical care. As such, total lung capacity, residual volume, intrathoracic gas volume, diffusing capacity for carbon monoxide, Krogh’s diffusion constant and maximal static inspiratory and expiratory mouth pressures will be captured.
Diffusion
Exhaling
Human Body
Inhalation
Monoxide, Carbon
Muscle Strength
Oral Cavity
Plethysmography
Respiratory Muscles
Respiratory Rate
Spirometry
Volume, Residual
Male mice were acclimatized to plethysmograph chambers (DSI Buxco® Multi-function Bias Flow, Harvard Bioscience, Holliston, USA) for at least one hour during 4 consecutive days. On the day of the experiment, respiratory variables were recorded while mice were quiet (after 20 min in the chamber). Normocapnic (21%O2 and 79%N2) and hypercapnic (8%CO2, 21%O2, 71%N2) gas mixtures were produced by a gas mixing device (ALICAT, RS-232 Multi Drop model BB9, Tucson, Arizona, USA; software Flowvision 1.0.16.0) and delivered continuously at 0.5 l.min-1. The recording session was as follows: 10 min in normocapnia followed by 10 min in hypercapnia. The plots were analyzed in order to evaluate the respiratory frequency (fR, respiratory cycles. min−1), tidal volume (VT) normalized as the ratio of VT divided by body weight (VT, μl.g−1) and minute ventilation (VE, ml.g−1. min−1).
Phox2b mutants received either 10-4 mg.kg-1 of etonogestrel per os (n=7) or solvent (n=7) 2 hours before measurements of respiratory variables. This protocol for administration was chosen on the basis of our previous work on mice free from CCHS (14 (link)). Wildtype littermate (n=8) received the solvent 2 hours before the measurements.
Phox2b mutants received either 10-4 mg.kg-1 of etonogestrel per os (n=7) or solvent (n=7) 2 hours before measurements of respiratory variables. This protocol for administration was chosen on the basis of our previous work on mice free from CCHS (14 (link)). Wildtype littermate (n=8) received the solvent 2 hours before the measurements.
Body Weight
etonogestrel
Males
Medical Devices
Mice, House
Plethysmography
Primary alveolar hypoventilation
Respiratory Rate
Solvents
Tidal Volume
Treatment Protocols
Systolic blood pressure in conscious wild-type and Gch1fl/flTie2cre mice was determined using the VisitechR computerized tail-cuff plethysmography system (Visitech) following 5 days of training and 3 days baseline periods. Experiments were performed between the hours of 8:00 and 12:00 am . The animal tails were passed through a cylindrical latex tail-cuff and taped down to reduce movement. Twenty readings were taken per mouse of which the first five readings were discarded. The remaining 15 readings were used to calculate the mean systolic blood pressure in each mouse.
Animals
Consciousness
Latex
Movement
Mus
Plethysmography
Systolic Pressure
Tail
Each recording included ABP and PPG signals as the target source and prediction source, respectively, and the recording was divided into 5-s segments. Next, to create the training data, we adopted the signal function extreme value search algorithm, which was mainly used to detect the peak and trough points in the ABP signal and to extract the diastolic blood pressure (DBP) and systolic blood pressure (SBP). According to JNC7 (Chobanian et al., 2003 (link)), the blood pressure conditions were classified as NT, PHT, or HT. Figure 1 illustrates the structure of the signal processing.
The PPG signal was then processed by primary and secondary differentiation to obtain its first and second derivative signals, which represent velocity plethysmography (VPG) and acceleration plethysmography (APG), respectively (Elgendi et al., 2018 (link)). Because a signal collected manually or by machine is inevitably subject to disturbance by the environment and other factors, such as circuit interference, resulting in the presence of various kinds of noise in the collected signal, noise reduction was an essential part of signal processing. Current noise reduction methods include filters, digital filters, Fourier transforms, wavelet transforms, etc. In the study discussed in this paper, the noise was reduced using a 0.5–10 Hz Butterworth bandpass filter. Then, to map the data to the same scale, the filtered PPG signals were mean-variance normalized.Figure 2 shows the PPG, VPG, and APG waveforms for the three different blood pressure categories.
The PPG signal was then processed by primary and secondary differentiation to obtain its first and second derivative signals, which represent velocity plethysmography (VPG) and acceleration plethysmography (APG), respectively (Elgendi et al., 2018 (link)). Because a signal collected manually or by machine is inevitably subject to disturbance by the environment and other factors, such as circuit interference, resulting in the presence of various kinds of noise in the collected signal, noise reduction was an essential part of signal processing. Current noise reduction methods include filters, digital filters, Fourier transforms, wavelet transforms, etc. In the study discussed in this paper, the noise was reduced using a 0.5–10 Hz Butterworth bandpass filter. Then, to map the data to the same scale, the filtered PPG signals were mean-variance normalized.
Acceleration
Blood Pressure
Hematological Disease
Plethysmography
Pressure
Pressure, Diastolic
Systolic Pressure
Top products related to «Plethysmography»
Sourced in United States, Italy, Germany
The BodPod is a lab instrument used to measure body composition. It utilizes air displacement plethysmography to determine an individual's body volume, from which their body density and body composition can be calculated.
Sourced in United States, Italy
The PEA POD is a laboratory equipment designed to measure body composition. It utilizes air displacement plethysmography technology to accurately determine an individual's body fat percentage, fat-free mass, and other related metrics.
Sourced in Japan, China
The BP-98A is a laboratory instrument designed for measuring blood pressure. It provides accurate readings of systolic and diastolic blood pressure values.
Sourced in Israel, United States
The EndoPAT 2000 is a non-invasive diagnostic device designed to measure endothelial function, a key indicator of cardiovascular health. The device uses plethysmography to detect changes in arterial pulsatile volume, providing a measure of endothelial function.
Sourced in United States
Tail-cuff plethysmography is a non-invasive technique used to measure blood pressure in small laboratory animals, such as mice and rats. The equipment utilizes a cuff placed around the animal's tail to detect changes in blood volume, which are then used to calculate systolic and diastolic blood pressure.
Sourced in United States, New Caledonia
The BP-2000 is a laboratory equipment designed for measuring blood pressure. It provides accurate and reliable readings to support various research and testing applications.
Sourced in United States, United Kingdom, Cameroon
The BP-2000 Blood Pressure Analysis System is a laboratory equipment device designed to measure and analyze blood pressure. It provides accurate and reliable readings of systolic and diastolic blood pressure, as well as heart rate.
Sourced in United States, United Kingdom
Tail-cuff plethysmography is a non-invasive technique used to measure blood pressure in small animals. It utilizes a cuff placed around the animal's tail to detect changes in blood volume, which are then converted into blood pressure measurements.
Sourced in United States, Germany, Sao Tome and Principe, Canada, United Kingdom, China, Macao, Japan, Brazil, France
Methacholine is a laboratory reagent used in various research and diagnostic applications. It functions as a cholinergic agonist, acting on muscarinic acetylcholine receptors. The core function of methacholine is to induce a physiological response, typically used in assessing airway responsiveness.
Sourced in Australia, United States, United Kingdom, New Zealand, Germany, Japan, Spain, Italy, China
PowerLab is a data acquisition system designed for recording and analyzing physiological signals. It provides a platform for connecting various sensors and transducers to a computer, allowing researchers and clinicians to capture and analyze biological data.
More about "Plethysmography"
Plethysmography is a non-invasive technique used to measure changes in the volume of an organ or body part, often the lungs or limbs.
This technique, also known as body plethysmography or impedance plethysmography, is commonly used to assess respiratory function, vascular dynamics, and other physiological processes.
Plethysmography provides valuable insights into the mechanics of breathing, blood flow, and tissue properties, supporting a wide range of clinical and research applications.
The technique involves monitoring the expansion and contraction of body parts, typically using a specialized chamber or sensor that detects volume changes.
Plethysmography has proven to be a reliable and versatile tool for evaluating respiratory and cardiovascular health, and continues to be an important method in the field of physiology and medicine.
Some of the key subtopics and related terms in plethysmography include: - BodPod: A type of air displacement plethysmography used to measure body composition and volume. - PEA POD: A similar air displacement plethysmography system used to measure body composition in infants and young children. - BP-98A: A non-invasive blood pressure monitor that uses the oscillometric method and can be used for plethysmography. - EndoPAT 2000: A device that uses peripheral arterial tonometry to measure endothelial function and vascular reactivity. - Tail-cuff plethysmography: A technique used to measure blood pressure in small animals, such as rodents. - BP-2000: A blood pressure analysis system that can be used for plethysmography-based measurements. - Methacholine: A bronchoconstrictor agent used in challenge tests to assess airway responsiveness. - PowerLab: A data acquisition system commonly used in plethysmography and other physiological research.
Whether you're conducting clinical research, evaluating respiratory or cardiovascular health, or exploring new applications of plethysmography, the insights and tools available can help streamline your work and enhance the quality of your findings.
This technique, also known as body plethysmography or impedance plethysmography, is commonly used to assess respiratory function, vascular dynamics, and other physiological processes.
Plethysmography provides valuable insights into the mechanics of breathing, blood flow, and tissue properties, supporting a wide range of clinical and research applications.
The technique involves monitoring the expansion and contraction of body parts, typically using a specialized chamber or sensor that detects volume changes.
Plethysmography has proven to be a reliable and versatile tool for evaluating respiratory and cardiovascular health, and continues to be an important method in the field of physiology and medicine.
Some of the key subtopics and related terms in plethysmography include: - BodPod: A type of air displacement plethysmography used to measure body composition and volume. - PEA POD: A similar air displacement plethysmography system used to measure body composition in infants and young children. - BP-98A: A non-invasive blood pressure monitor that uses the oscillometric method and can be used for plethysmography. - EndoPAT 2000: A device that uses peripheral arterial tonometry to measure endothelial function and vascular reactivity. - Tail-cuff plethysmography: A technique used to measure blood pressure in small animals, such as rodents. - BP-2000: A blood pressure analysis system that can be used for plethysmography-based measurements. - Methacholine: A bronchoconstrictor agent used in challenge tests to assess airway responsiveness. - PowerLab: A data acquisition system commonly used in plethysmography and other physiological research.
Whether you're conducting clinical research, evaluating respiratory or cardiovascular health, or exploring new applications of plethysmography, the insights and tools available can help streamline your work and enhance the quality of your findings.