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Plethysmograph

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https://www.readbyqxmd.com/read/29877379/lock-in-technique-for-extraction-of-pulse-rates-and-associated-confidence-levels-from-video
#1
Adam Eaton, Karthik Vishwanath, Chi-Hao Cheng, E Paige Lloyd, Kurt Hugenberg
We investigate the practical applicability of video photoplethysmography (VPPG) to extract heart rates of subjects using noncontact color video recordings of human faces collected under typical indoor laboratory conditions using commercial video cameras. Videos were processed following three previously described simple VPPG algorithms to produce a time-varying plethysmographic signal. These time signals were then analyzed using, to the best of our knowledge, a novel, lock-in algorithm that was developed to extract the pulsatile frequency component...
June 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29807027/ventilatory-depressant-effects-of-opioids-alone-and-in-combination-with-cannabinoids-in-rhesus-monkeys
#2
Peter F Weed, Lisa R Gerak, Charles P France
Pain is a serious health problem that is commonly treated with opioids, although the doses of opioids needed to treat pain are often similar to those that decrease respiration. Combining opioids with drugs that relieve pain through non-opioid mechanisms can decrease the doses of opioids needed for analgesia, resulting in an improved therapeutic window, but only if the doses of opioids that decrease respiration are not similarly decreased. Using small doses of opioids to treat pain has the potential to reduce the number of overdoses and deaths...
May 25, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29790670/reference-equations-for-the-interpretation-of-forced-expiratory-and-plethysmographic-measurements-in-infants
#3
Zihang Lu, Rachel E Foong, Krzysztof Kowalik, Theo J Moraes, Aimee Dubeau, Diana Lefebvre, Stephanie D Davis, Susan Balkovec, Allan Becker, Piush Mandhane, Stuart E Turvey, Wendy Lou, Malcolm R Sears, Felix Ratjen, Padmaja Subbarao
BACKGROUND: Pulmonary function testing is commonly performed for diagnosis and clinical management of respiratory diseases. It is important to use appropriate reference equations from healthy subjects for interpretation of data from infants with lung disease. This study aimed to determine if published reference equations were similar to forced flow measures and plethysmographic infant pulmonary function testing data collected in the Canadian Healthy Infant Longitudinal Development (CHILD) Study...
May 23, 2018: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29775671/variable-ventilation-decreases-airway-responsiveness-and-improves-ventilation-efficiency-in-a-rat-model-of-asthma
#4
Fatemeh Ilka, Mohammad Javan, Mohammad Reza Raoufy
The optimal ventilation strategy in patients receiving mechanical ventilation for severe asthma remains unclear. The effect of conventional ventilation (with constant tidal volume and respiratory rate) and variable ventilation (with the same average but variable tidal volume and respiratory rate) on peak airway pressure and airway exacerbation induced by increasing doses of methacholine was compared in a rat model of asthma. The respiratory rate and tidal volume data were obtained from a spontaneously breathing intact rat during immobility using a whole-body plethysmograph...
May 15, 2018: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29768341/the-plethysmographic-variability-index-does-not-predict-fluid-responsiveness-estimated-by-esophageal-doppler-during-kidney-transplantation-a-controlled-study
#5
Morgan Le Guen, Arnaud Follin, Etienne Gayat, Marc Fischler
Research is ongoing to find a noninvasive method of monitoring, which can predict fluid responsiveness in patients undergoing kidney transplantation.To compare the responses to fluid challenges with the Pleth Variability Index, a noninvasive dynamic index derived from plethysmographic variability (Radical 7 pulse oximeter; Masimo Corporation, Irvine, CA), and the esophageal Doppler, the criterion standard.Observational study.University hospital; study from May 2011 and May 2012.Forty-eight patients with end-renal function were included and 44 analyzed...
May 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29767468/central-adenosine-a-1-receptors-inhibit-cough-via-suppression-of-excitatory-glutamatergic-and-tachykininergic-neurotransmission
#6
Ahmed Z El-Hashim, Seena Mathews, Fajer Al-Shamlan
BACKGROUND AND PURPOSE: The A1 adenosine receptor is reported to mediate several excitatory effects in the airways and has inhibitory effects in the central nervous system. In this study, we investigated the role of peripheral and central A1 adenosine receptors in regulating cough and airway obstruction. EXPERIMENTAL APPROACH: Drugs were administered to guinea pigs via the inhaled or intracerebroventricular (i.c.v.) routes. Cough was induced by exposing guinea pigs to aerosolised 0...
May 16, 2018: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29765337/plethysmographic-loops-a-window-on-the-lung-pathophysiology-of-copd-patients
#7
Dejan Radovanovic, Matteo Pecchiari, Fabio Pirracchio, Camilla Zilianti, Edgardo D'Angelo, Pierachille Santus
Plethysmographic alveolar pressure-flow ( P alv - F ) loops contain potentially relevant information about the pathophysiology of chronic obstructive pulmonary disease (COPD), but no quantitative analysis of these loops during spontaneous breathing has ever been performed. The area of the loop's inspiratory ( A ins ) and expiratory portion ( A exp ), and the difference between the end-expiratory and end-inspiratory alveolar pressure (Δ P alv ) were measured in 20 young, 20 elderly healthy subjects, and 130 stable COPD patients...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29751145/antioxidant-treatment-for-impaired-hypoxic-ventilatory-responses-in-experimental-diabetes-in-the-rat
#8
Mieczyslaw Pokorski, Malgorzata Poździk, Andrea Mazzatenta
Inflammation, tissue hypoxia, and impaired hypoxic ventilatory response (HVR) are the intricately entwined features of diabetes which perpetuate the disease and its sequelae. Hyperglycemia, notably, is an oxygen consuming process due to enhanced cellular metabolism. Oxidative stress underlies diabetic pathogenesis and also is a crucial modulator of the hypoxic chemoreflex. The present study seeks to determine if suppressed ventilation in diabetes could be improved by antioxidant treatment. The study was performed in streptozotocin-induced diabetes in awake rats...
May 8, 2018: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29744250/area-under-the-curve-of-finger-photoplethysmography-as-an-evaluation-measure-for-sympathetic-activity-during-lumbar-epidural-anaesthesia
#9
Slobodan Mihaljevic, Milenko Bevanda, Kresimir Reiner, Krunoslav Sporcic, Ljiljana Mihaljevic, Marko Cacic
Objective: To detect changes in finger photoplethysmography after administration of epidural anaesthesia as a surrogate method for evaluating autonomic nervous system activity. Methods: We included a total of 46 patients scheduled for elective surgical procedures under lumbar epidural anaesthesia. A Biopac SS4LA pulse plethysmograph transducer was used for photoplethysmography recording, and the device was placed on the first toe of the right leg. The first standard lead of the electrocardiogram was simultaneously measured with the finger photoplethysmography...
April 2018: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/29742906/relationship-of-spirometric-body-plethysmographic-and-diffusing-capacity-parameters-to-emphysema-scores-derived-from-ct-scans
#10
Kathrin Kahnert, Bertram Jobst, Frank Biertz, Jürgen Biederer, Henrik Watz, Rudolf M Huber, Jürgen Behr, Philippe A Grenier, Peter Alter, Claus F Vogelmeier, Hans-Ulrich Kauczor, Rudolf A Jörres
Phenotyping of chronic obstructive pulmonary disease (COPD) with computed tomography (CT) is used to distinguish between emphysema- and airway-dominated type. The phenotype is reflected in correlations with lung function measures. Among these, the relative value of body plethysmography has not been quantified. We addressed this question using CT scans retrospectively collected from clinical routine in a large COPD cohort. Three hundred and thirty five patients with baseline data of the German COPD cohort COPD and Systemic Consequences-Comorbidities Network were included...
January 1, 2018: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/29614329/presetting-ecg-electrodes-for-earlier-heart-rate-detection-in-the-delivery-room
#11
Rashmi Gulati, Michael Zayek, Fabien Eyal
AIM: To determine whether heart rate (HR) could be detected earlier than by pulse oximeter (POX), using a novel method of application of electrocardiogram (ECG) electrodes during neonatal resuscitation in the delivery room. METHODS: ECG electrodes were set before delivery to be applied to the back of infants' thorax. Time to detect HR was recorded as soon as a numerical HR along with a recognizable and persistent QRS complex was observed on ECG monitor (HRECG) and a plethysmographic waveform was seen on POX monitor (HRPOX)...
March 31, 2018: Resuscitation
https://www.readbyqxmd.com/read/29611767/impulse-oscillometry-and-nitrogen-washout-test-in-the-assessment-of-small-airway-dysfunction-in-asthma-correlation-with-quantitative-computed-tomography
#12
Leonello Fuso, Giuseppe Macis, Carola Condoluci, Martina Sbarra, Chiara Contu, Emanuele G Conte, Giulia Angeletti, Paolo Montuschi
OBJECTIVE: Small airway dysfunction (SAD) and airway remodeling influence the disease control and progression in asthma. We investigated whether impulse oscillometry (IOS) and single breath nitrogen washout (SBN2 W) could be reliable tests in evaluating SAD and airway remodeling by correlating their data with radiological parameters derived from quantitative chest multidetector computed tomography (MDCT) imaging. METHODS: Lung function tests were performed before and after bronchodilator...
April 3, 2018: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/29607211/development-of-a-multisensory-wearable-system-for-monitoring-cigarette-smoking-behavior-in-free-living-conditions
#13
Masudul Haider Imtiaz, Raul I Ramos-Garcia, Volkan Yusuf Senyurek, Stephen Tiffany, Edward Sazonov
This paper presents the development and validation of a novel multi-sensory wearable system (Personal Automatic Cigarette Tracker v2 or PACT2.0) for monitoring of cigarette smoking in free-living conditions. The contributions of the PACT2.0 system are: (1) the implementation of a complete sensor suite for monitoring of all major behavioral manifestations of cigarette smoking (lighting events, hand-to-mouth gestures, and smoke inhalations); (2) a miniaturization of the sensor hardware to enable its applicability in naturalistic settings; and (3) an introduction of new sensor modalities that may provide additional insight into smoking behavior e...
December 2017: Electronics (Basel)
https://www.readbyqxmd.com/read/29605198/gas-exchange-and-breathing-pattern-in-women-with-postmenopausal-bone-fragility
#14
F Polverino, J P de Torres, C Santoriello, A Capuozzo, I Mauro, Joselyn Rojas-Quintero, B D'Agostino, M Pistolesi, B Celli, M Polverino, C A Owen
BACKGROUND: Little is known about the relationship between bone fragility and respiratory function. We hypothesized that women with osteoporosis or osteopenia, without cardio-pulmonary disease, have perturbations in the pattern of breathing and gas exchange. METHODS: In 44 women with bone fragility (BF, T score: < -1), and 20 anthropomorphically-matched control women (T score > -1) we compared pulmonary function tests, central respiratory drive (mouth occlusion pressure or P 0...
April 2018: Respiratory Medicine
https://www.readbyqxmd.com/read/29587296/the-relationships-of-the-fractional-excretion-of-uric-acid-with-brachial-ankle-pulse-wave-velocity-and-ankle-brachial-index-in-chinese-young-adults
#15
Jia-Wen Hu, Yang Wang, Chao Chu, Yu Yan, Keke Wang, Wenling Zheng, Qiong Ma, Yong-Bo Lv, Yin Deng, Bo Yan, Jian-Jun Mu
BACKGROUND/AIMS: Elevated serum uric acid (UA) was intimately correlated with vascular stiffness and abnormal ankle brachial index (ABI) in various populations. These correlations lost significance after adjustment for estimated glomerular filtration rate (eGFR), indicating that the association of UA and brachial-ankle pulse wave velocity (baPWV) or ABI might be driven by kidney function. UA is predominantly eliminated through the kidneys, and metabolic disorders can influence the clearance of UA...
2018: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29568266/normalization-of-blood-pressure-with-spinal-cord-epidural-stimulation-after-severe-spinal-cord-injury
#16
Susan J Harkema, Siqi Wang, Claudia A Angeli, Yangsheng Chen, Maxwell Boakye, Beatrice Ugiliweneza, Glenn A Hirsch
Chronic low blood pressure and orthostatic hypotension remain challenging clinical issues after severe spinal cord injury (SCI), affecting health, rehabilitation, and quality of life. We previously reported that targeted lumbosacral spinal cord epidural stimulation (scES) could promote stand and step functions and restore voluntary movement in patients with chronic motor complete SCI. This study addresses the effects of targeted scES for cardiovascular function (CV-scES) in individuals with severe SCI who suffer from chronic hypotension...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29506963/variability-of-forearm-collateral-circulation-an-observational-study-of-serial-hand-plethysmography-testing
#17
Sandhya Reddy, Pariseema S Pancholy, Kaveet P Pandya, Anvit Rai, Aman T Patel, Siddharth Chauhan, Ian C Gilchrist
OBJECTIVES: Evaluation of plethysmography as a reliable triage tool to access collateral circulation in the hand prior to transradial access. BACKGROUND: Hand plethysmographic testing has been used for access site triage prior to cardiac catheterization despite a lack of data supporting its result's stability. METHODS: Cohort of consecutive outpatients presenting for evaluation prior to cardiac catheterization underwent hand plethysmographic testing at the beginning of the office visit and before discharge...
March 2, 2018: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29501247/the-impact-of-aging-on-outpatients-with-asthma-in-a-real-world-setting
#18
Giorgio Ciprandi, Irene Schiavetti, Fabio L M Ricciardolo
BACKGROUND: Asthma is characterized by airway inflammation and bronchial hyperreactivity. It is conceived that aging may affect asthma characteristics, but this issue is still not completely clarified in clinical practice. OBJECTIVE: The present study investigated whether aging may affect some clinical and functional factors in outpatients with asthma visited in a real-world setting, such as clinical practice. METHODS: Globally, 391 outpatients (163 males, median age 47 years) with asthma were consecutively evaluated...
March 2018: Respiratory Medicine
https://www.readbyqxmd.com/read/29464303/brief-ethanol-exposure-and-stress-related-factors-disorganize-neonatal-breathing-plasticity-during-the-brain-growth-spurt-period-in-the-rat
#19
A F Macchione, F Anunziata, B O Haymal, P Abate, J C Molina
RATIONALE: The effects of early ethanol exposure upon neonatal respiratory plasticity have received progressive attention given a multifactorial perspective related with sudden infant death syndrome or hypoxia-associated syndromes. The present preclinical study was performed in 3-9-day-old pups, a stage in development characterized by a brain growth spurt that partially overlaps with the 3rd human gestational trimester. METHODS: Breathing frequencies and apneas were examined in pups receiving vehicle or a relatively moderate ethanol dose (2...
April 2018: Psychopharmacology
https://www.readbyqxmd.com/read/29404181/association-between-the-serum-metabolic-profile-and-lung-function-in-chronic-obstructive-pulmonary-disease
#20
Shima Rafie, Subhabrata Moitra, Bill B Brashier
OBJECTIVES: Although dietary patterns are known to modulate disease severity in patients with chronic obstructive pulmonary disease (COPD), the relationship between the circulating lipid profile and lung function in COPD has not been studied extensively. MATERIAL AND METHODS: There were 43 COPD patients with a history of smoking and 39 patients with a history of biomass fuel exposure recruited in this study, along with 43 age-matched healthy controls. All participants underwent complete lung function profiling, and their glucose and lipid profiles were measured...
January 2018: Turkish Thoracic Journal
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