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Plethysmograph

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https://www.readbyqxmd.com/read/29404181/association-between-the-serum-metabolic-profile-and-lung-function-in-chronic-obstructive-pulmonary-disease
#1
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
https://www.readbyqxmd.com/read/29351164/body-mass-index-versus-body-fat-percentage-in-prospective-nfl-athletes-overestimation-of-obesity-rate-in-athletes-at-the-nfl-scouting-combine
#2
Capt Matthew T Provencher, Jorge Chahla, George Sanchez, Mark E Cinque, Nicholas I Kennedy, Jim Whalen, Mark D Price, Gilbert Moatshe, Robert F LaPrade
Obesity has been previously noted as a major issue in the National Football League (NFL), where it has been shown that 97% of all players demonstrate a body mass index (BMI) of ≥25.0 with a reported obesity rate of 56% (BMI ≥30.0). However, BMI does not take into account body composition by mass, and may overestimate prevalence of obesity. The purposes of this study were to (1) determine the validity of BMI as a measure of body fat percentage and obesity in athletes at the NFL Combine, to define the obesity rate based on body fat percentage compared to BMI...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29320566/the-effect-of-time-of-day-and-chest-physiotherapy-on-multiple-breath-washout-measures-in-children-with-clinically-stable-cystic-fibrosis
#3
Christian Voldby, Kent Green, Susanne Rosthøj, Thomas Kongstad, Lue Philipsen, Frederik Buchvald, Marianne Skov, Tania Pressler, Per Gustafsson, Kim G Nielsen
BACKGROUND: In this pilot study we investigated daytime variation of multiple breath nitrogen washout (N2MBW) measures in children with clinically stable cystic fibrosis. To our knowledge the effect of time-of-day on multiple breath washout measures in patients with cystic fibrosis has not previously been reported. Furthermore, we assessed the influence of chest physiotherapy on N2MBW measures. METHODS: Ten school children with cystic fibrosis performed N2MBW followed by spirometry and plethysmography in the morning and afternoon at three visits that were one month apart...
2018: PloS One
https://www.readbyqxmd.com/read/29251031/correlation-between-time-lag-of-arterial-plethysmographic-waveforms-and-systemic-vascular-resistance-a-prospective-study
#4
Radhakrishnan Muthuchellappan, Ramesh V J, Umamaheswara Rao Ganne S, Thennarasu K, Anjana Jacob, Sripathy G, Bhadrinarayan V, Mohanvelu K
Blood pressure (BP), a surrogate of cardiac output (CO), is also dependent on systemic vascular resistance (SVR). But SVR is not routinely monitored in daily clinical practice. We hypothesise that the time difference between the peripheral arterial waveform and the finger plethysmographic waveform (time lag index - TLi) could indicate the systemic vascular resistance. In this study, we correlated TLi with the systemic vascular resistance measured by minimally invasive CO monitor (pulse contour analysis). SVR changes in response to administration of mannitol were studied...
December 18, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29249773/does-pneumoperitoneum-affect-perfusion-index-and-pleth-variability-index-in-patients-receiving-combined-epidural-and-general-anesthesia
#5
Zen'ichiro Wajima, Toshiya Shiga, Kazuyuki Imanaga
Plethysmographic variability index (PVI) is a dynamic index used for the purpose of fluid responsiveness in patients, and the effect of pneumoperitoneum on PVI is still unclear. We therefore attempted to determine whether PVI and perfusion index (PI) change before/after pneumoperitoneum in patients receiving combined epidural and general anesthesia, which is a common anesthesia method with intravenous remifentanil. Twenty patients underwent laparoscopic cholecystectomy or colectomy. Immediately before pneumoperitoneum, variables were measured at baseline I and were then measured every min for 5 min after pneumoperitoneum start...
December 18, 2017: Bioscience Trends
https://www.readbyqxmd.com/read/29203173/evaluation-of-the-dynamic-predictors-of-fluid-responsiveness-in-dogs-receiving-goal-directed-fluid-therapy
#6
Maja J Drozdzynska, Yu-Mei Chang, Giacomo Stanzani, Ludovic Pelligand
OBJECTIVES: Goal-directed fluid therapy (GDFT) based on pulse pressure variation (PPV) was used in anaesthetized dogs undergoing abdominal surgeries. The aims were 1) to evaluate the success rate of the PPV ≥13% in detecting fluid responsiveness [delta stroke volume (ΔSV) ≥10%]; 2) to assess the correlation between PPV, systolic pressure variation (SPV), Plethysmograph Variability Index (PVI) and central venous pressure (CVP) and 3) to establish the threshold value for the PVI that would predict a PPV value of ≥13% and indirectly discriminate responders from nonresponders to fluid therapy...
January 2018: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29189318/standardised-noxious-stimulation-guided-individual-adjustment-of-remifentanil-target-controlled-infusion-to-prevent-haemodynamic-responses-to-laryngoscopy-and-surgical-incision-a-randomised-controlled-trial
#7
Aline Defresne, Luc Barvais, François Clement, Vincent Bonhomme
BACKGROUND: The surgical plethysmographic index (SPI) is one of the available indexes of the nociception-antinociception (NAN) balance. Individually adjusting the NAN balance to prevent somatic responses to noxious stimulation remains a challenge. OBJECTIVES: To assess whether guiding remifentanil administration according to the SPI response to a calibrated noxious stimulus (NANCAL) can blunt the haemodynamic response to tracheal intubation and surgical incision...
November 18, 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/29183008/correlates-of-pulmonary-function-in-children-with-sickle-cell-disease-and-elevated-fetal-hemoglobin
#8
Adekunle D Adekile, Asmaa Azab, Abdullah Owayed, Mousa Khadadah
OBJECTIVE: The current study was carried out to compare pulmonary function tests (PFT) in pediatric Kuwaiti sickle cell disease (SCD) patients to age-matched normal controls and to investigate the association of PFTS to selected clinical and laboratory parameters. SUBJECTS AND METHODS: There were 38 patients with SCD and 36 controls in the study. The patients were recruited from the Pediatric Hematology Clinics of Mubarak Al-Kabeer and Al-Amiri Hospitals, Kuwait and were studied in steady state...
November 28, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/29163200/a-pulse-wave-velocity-based-method-to-assess-the-mean-arterial-blood-pressure-limits-of-autoregulation-in-peripheral-arteries
#9
Ananya Tripathi, Yurie Obata, Pavel Ruzankin, Narwan Askaryar, Dan E Berkowitz, Jochen Steppan, Viachaslau Barodka
Background: Constant blood flow despite changes in blood pressure, a phenomenon called autoregulation, has been demonstrated for various organ systems. We hypothesized that by changing hydrostatic pressures in peripheral arteries, we can establish these limits of autoregulation in peripheral arteries based on local pulse wave velocity (PWV). Methods: Electrocardiogram and plethysmograph waveforms were recorded at the left and right index fingers in 18 healthy volunteers. Each subject changed their left arm position, keeping the right arm stationary...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29122914/pulmonary-function-deficits-in-newborn-screened-infants-with-cystic-fibrosis-managed-with-standard-uk-care-are-mild-and-transient
#10
Gwyneth Davies, Janet Stocks, Lena P Thia, Ah-Fong Hoo, Andrew Bush, Paul Aurora, Lucy Brennan, Simon Lee, Sooky Lum, Philippa Cottam, Joanne Miles, Jane Chudleigh, Jane Kirkby, Ian M Balfour-Lynn, Siobhán B Carr, Colin Wallis, Hilary Wyatt, Angie Wade
With the advent of novel designer molecules for cystic fibrosis (CF) treatment, there is huge need for early-life clinical trial outcomes, such as infant lung function (ILF). We investigated the degree and tracking of ILF abnormality during the first 2 years of life in CF newborn screened infants.Forced expiratory volume in 0.5 s (FEV0.5), lung clearance index (LCI) and plethysmographic functional residual capacity were measured at ∼3 months, 1 year and 2 years in 62 infants with CF and 34 controls...
November 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/29119007/endothelial-dysfunction-is-associated-with-activation-of-the-type-i-interferon-system-and-platelets-in-patients-with-systemic-lupus-erythematosus
#11
Helena Tydén, Christian Lood, Birgitta Gullstrand, Christoffer Tandrup Nielsen, Niels H H Heegaard, Robin Kahn, Andreas Jönsen, Anders A Bengtsson
Objectives: Endothelial dysfunction may be connected to cardiovascular disease (CVD) in systemic lupus erythematosus (SLE). Type I interferons (IFNs) are central in SLE pathogenesis and are suggested to induce both endothelial dysfunction and platelet activation. In this study, we investigated the interplay between endothelial dysfunction, platelets and type I IFN in SLE. Methods: We enrolled 148 patients with SLE and 79 sex-matched and age-matched healthy controls (HCs)...
2017: RMD Open
https://www.readbyqxmd.com/read/29111029/hematoma-volume-is-a-predictive-factor-of-disturbed-autoregulation-after-spontaneous-intracerebral-hemorrhage
#12
Hongyin Ma, Zhen-Ni Guo, Xin Sun, Jia Liu, Shan Lv, Lu Zhao, Weitong Guo, Hang Jin, Yi Yang
BACKGROUND: Dynamic cerebral autoregulation (dCA) is probably disturbed after spontaneous intracerebral hemorrhage (ICH) and could be an independent predictor of clinical outcome. Clinical determinants of dCA status after ICH need to be further elucidated. METHODS: We finally enrolled 53 patients diagnosed with supratentorial ICH within 6days from onset. DCA was assessed 4-6days after ICH onset by monitoring middle cerebral artery blood flow velocities and simultaneous arterial blood pressure continuously, utilizing transcranial Doppler combined with a servo-controlled finger plethysmograph...
November 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29099251/effect-of-brachycephaly-and-body-condition-score-on-respiratory-thermoregulation-of-healthy-dogs
#13
Michael S Davis, Sabrina L Cummings, Mark E Payton
OBJECTIVE To evaluate the effect of brachycephaly and body condition score on respiratory thermoregulation of healthy dogs. DESIGN Prospective study. ANIMALS 52 brachycephalic and 53 nonbrachycephalic dogs. PROCEDURES All dogs were exposed to a cool treatment (temperature, 21.8 ± 1.7°C [71.2 ± 3.1°F]; relative humidity, 62.2 ± 9.7%; and ambient enthalpy, 47.7 ± 6.6 kcal/kg) and then a hot treatment (temperature, 32.9 ± 1.7°C [91.2 ± 3.1°F]; relative humidity, 51.9 ± 9.8%; and ambient enthalpy, 74...
November 15, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/29060515/physical-activity-classification-using-time-frequency-signatures-of-motion-artifacts-in-multi-channel-electrical-impedance-plethysmographs
#14
Hassan Aqeel Khan, Amit Gore, Jeff Ashe, Shantanu Chakrabartty
Physical activities are known to introduce motion artifacts in electrical impedance plethysmographic (EIP) sensors. Existing literature considers motion artifacts as a nuisance and generally discards the artifact containing portion of the sensor output. This paper examines the notion of exploiting motion artifacts for detecting the underlying physical activities which give rise to the artifacts in question. In particular, we investigate whether the artifact pattern associated with a physical activity is unique; and does it vary from one human-subject to another? Data was recorded from 19 adult human-subjects while conducting 5 distinct, artifact inducing, activities...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060214/analysis-of-a-gmr-based-plethysmograph-transducer-and-its-utility-for-real-time-blood-pressure-measurement
#15
Vinit Kumar Chugh, Kubera Kalyan, C S Anoop, Amit Patra, Shubham Negi
The paper presents study and analysis of a Giant Magneto Resistance (GMR)-based magneto plethysmograph and illustrates its efficacy as a tool for real-time cuff-less measurement of Blood Pressure (BP). The proposed scheme employs two GMR sensors and associated biasing and signal conditioning in its architecture. The delay between output of the GMR sensors is used to estimate the BP. The methodology, circuits and signal processing stages used are described in the paper. A prototype of the GMR-sensing solution is developed and tested...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060142/classification-of-voluntary-coughs-applied-to-the-screening-of-respiratory-disease
#16
Christian Infante, Daniel B Chamberlain, Rahul Kodgule, Richard Ribon Fletcher
Pulmonary and respiratory diseases (e.g. asthma, COPD, allergies, pneumonia, tuberculosis, etc.) represent a large proportion of the global disease burden, mortality, and disability. In this context of creating automated diagnostic tools, we explore how the analysis of voluntary cough sounds may be used to screen for pulmonary disease. As a clinical study, voluntary coughs were recorded using a custom mobile phone stethoscope from 54 patients, of which 7 had COPD, 15 had asthma, 11 had allergic rhinitis, 17 had both asthma and allergic rhinitis, and four had both COPD and allergic rhinitis...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28981568/assessment-of-dynamic-variables-of-fluid-responsiveness-to-predict-desufflation-induced-hypotension-during-paediatric-laparoscopic-surgery
#17
E-H Kim, J-H Lee, I-K Song, H-G Ryu, H-S Kim, J-T Kim
Background: During laparoscopic surgery in paediatric patients, sudden hypotension may occur following peritoneal desufflation due to hypovolaemia or an acute increase in gastrointestinal venous capacitance by the release of intra-abdominal pressure. This study examined whether dynamic variables of fluid responsiveness during pneumoperitoneum can predict the occurrence of hypotension following desufflation. Methods: A total of 120 paediatric subjects were prospectively enrolled...
November 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28940503/measuring-arterial-blood-pressure-in-humans-auscultatory-and-automatic-measurement-techniques-for-human-biological-field-studies
#18
Gary D James, Linda M Gerber
Human biologists have been examining arterial blood pressure since they began studying the effects of the environment and culture on the health of diverse populations. The Korotkoff auscultatory technique with a trained observer and aneroid sphygmomanometer is the method of choice for blood pressure measurement in many bioanthropological field contexts. Korotkoff sounds (the first and fifth phases) are the preferred determinants of systolic and diastolic pressure, even in infants, children, pregnant women, and the elderly...
September 22, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28871670/-early-detection-of-endothelial-dysfunction-in-children-with-autoimmune-diseases-by-a-novel-noninvasive-technique
#19
Liron Borenstein-Levin, Riva Brik, Giora Pillar, Yonatan Butbul Aviel
INTRODUCTION: Atherosclerosis is emerging as one of the most important causes of morbidity and mortality among patients with different rheumatologic disease. Endothelial dysfunction may be an early sign of atherosclerosis. OBJECTIVES: To evaluate the occurrence of endothelial dysfunction in children with autoimmune diseases, including juvenile idiopathic arthritis (JIA), systemic lupus erythematosus (SLE) and dermatomyositis, using a novel noninvasive technique...
July 2017: Harefuah
https://www.readbyqxmd.com/read/28866598/a-magnetic-plethysmograph-probe-for-local-pulse-wave-velocity-measurement
#20
Nabeel P M, Jayaraj Joseph, Mohanasankar Sivaprakasam
OBJECTIVE: We present the design and experimental validation of an arterial compliance probe with dual magnetic plethysmograph (MPG) transducers for local pulse wave velocity (PWV) measurement. The MPG transducers (positioned at 23 mm distance apart) utilizes Hall-effect sensors and permanent magnets for arterial blood pulse detection. METHODS: The MPG probe was initially validated on an arterial flow phantom using a reference method. Further, 20 normotensive subjects (14 males, age = 24 ± 3...
October 2017: IEEE Transactions on Biomedical Circuits and Systems
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