journal
MENU ▼
Read by QxMD icon Read
search

Physiological Measurement

journal
https://www.readbyqxmd.com/read/28339394/global-and-regional-assessment-of-sustained-inflation-pressure-volume-curves-in-patients-with-acute-respiratory-distress-syndrome
#1
Tobias Becher, Philipp Rostalski, Matthias Kott, Andy Adler, Dirk Schadler, Norbert Weiler, Inez Frerichs
Static or quasi-static pressure-volume (P-V) curves can be used to determine the lung mechanical properties of patients suffering from acute respiratory distress syndrome (ARDS). According to the traditional interpretation, lung recruitment occurs mainly below the lower point of maximum curvature (LPMC) of the inflation P-V curve. Although some studies have questioned this assumption, setting of positive end-expiratory pressure 2 cmH2O above the LPMC was part of a "lung-protective" ventilation strategy successfully applied in several clinical trials...
March 24, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28333038/detecting-colorectal-cancer-using-electrical-impedance-spectroscopy-an-ex-vivo-feasibility-study
#2
Angela Pathiraja, Paul Ziprin, Arsam Shiraz, Reza Mirnezami, Andrew Tizzard, Brian Brown, Andreas Demosthenous, Richard H Bayford
OBJECTIVE: Colorectal cancer is the fourth most common cancer worldwide, with a lifetime risk of around 20%. Current solutions do not allow clinicians to objectively assess tissue abnormality during endoscopy and perioperatively. A solution capable of objectively assessing samples in real time could greatly improve the treatment process. A solution that can be integrated in minimally invasive diagnostics and management strategies to provide real-time point-of-care information would be greatly transformative...
March 23, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28333037/cerebral-hemodynamic-with-intra-aortic-balloon-pump-business-as-usual
#3
Juliana Caldas, Ronney B Panerai, Edson Bor-Seng-Shu, Juliano Almeida, Graziela Ferreira, Ligia Cunha, Ricardo Nogueira, Marcelo Oliveira, Fabio Jatene, Thompson Robinson, Ludhmila Hajjar
Intra-aortic balloon pump (IABP) is commonly used as mechanical support after cardiac surgery or cardiac shock. Although its benefits for cardiac function have been well documented, its effects on cerebral circulation are still controversial. We hypothesized that transfer function analysis (TFA) and continuous estimates of dynamic cerebral autoregulation (CA) provide consistent results in the assessment of cerebral autoregulation in patients with IABP. Continuous recordings of blood pressure (BP, intra-arterial line), end-tidal CO2, heart rate and cerebral blood flow velocity (CBFV, transcranial Doppler) were obtained i) 5 minutes with IABP ratio 1:3, ii) 5 minutes, starting 1 minute with the IABP-ON, and continuing for another 4 minutes without pump assistance (IABP-OFF)...
March 23, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28327472/spatiotemporal-treadmill-gait-measurements-using-a-laser-range-scanner-feasibility-study-of-the-healthy-young-adults
#4
S Tanabe, T Ii, S Koyama, E Saitoh, N Itoh, K Ohtsuka, Y Katoh, A Shimizu, Y Tomita
OBJECTIVE: Spatio-temporal parameters are typically used for gait analysis. Although these parameters are measured by sophisticated systems such as 3D motion capture system or optoelectronic bars, these systems cannot be deployed easily because of their high costs, large space requirements and elaborate set-up. The purpose of this study is to develope a system for measuring spatiotemporal gait parameters using a laser range scanner during treadmill gait. APPROACH: To calculate accurate spatiotemporal parameters, the differences between the laser range scanner measured values and the reference values obtained from a 3D motion capture system were investigated in thirty subjects...
March 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28319030/ischemic-small-intestine-in-vivo-versus-ex-vivo-bioimpedance-measurements
#5
Runar James Strand-Amundsen, Henrik Reims, Christian Tronstad, Havard Kalvoy, Orjan Martinsen, Jan Hogetveit, Tom Erik Ruud, Tor Inge Tønnessen
Bioimpedance has been used to investigate changes in electrical parameters during ischemia in various tissues. The small intestine is a multi-layered structure, with several distinct tissue types, and ischemia related changes occur at different times in the different intestinal layers. When investigating how the electrical properties in the small intestine is affected by ischemia, some researchers have used ex-vivo models while others have used in-vivo models. In this study, we compare ischemic time development of electrical parameters in ischemic in-vivo versus ex-vivo small intestine...
March 20, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28304283/an-introduction-into-autonomic-nervous-function
#6
John M Karemaker
Not required at this stage.
March 17, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28301328/evaluate-muscle-tension-using-intramuscular-pressure-device-in-rabbit-tibialis-anterior-model-for-improved-tendon-transfer-surgery
#7
Loribeth Evertz, Liselotte Bulstra, Alexander Shin, Kenton R Kaufman
Quantitative evaluation of passive tension in a muscle is important in tendon transfer surgeries, however, currently appropriate intraoperative measurement techniques are lacking. Intramuscular pressure (IMP) is explored as an application to access force. The tibialis anterior (TA) in New Zealand white rabbits (n=9) was used to test the hypothesis of a strong correlation between the IMP, muscle force, and length. This study also helped to develop intraoperative techniques for future human studies evaluating various insertion techniques (parallel vs...
March 16, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28301327/high-resolution-respiratory-inductive-plethysmography-in-rats-validation-in-anesthetized-conditions
#8
Timothe Flenet, Julie Fontecave-Jallon, Pierre-Yves Gumery, Charles Eynard, Francois Boucher, Pierre Baconnier, Stephane Tanguy
Respiratory monitoring is often required in experimental physiological and pharmacological studies in rodents. Currently, the mostly used techniques are direct measurement of airflow on intubated animals and whole body plethysmography. Although the reliability of these methods has been broadly demonstrated, they also have several drawbacks such as invasiveness, high cost of use or confinement of the animals. Respiratory Inductive Plethysmography (RIP) is a non-invasive technique already used in medium-sized mammals that has not yet been evaluated in small rodents...
March 16, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28296647/intra-and-inter-rater-reliability-of-lower-leg-waterplethysmography-bioelectrical-impedance-and-muscle-twitch-force-for-the-use-in-standing-work-evaluation
#9
Rudolf Wall, Oliwia Lips, Robert Seibt, Monika Rieger, Benjamin Steinhilber
OBJECTIVES: Prolonged standing is associated with multiple risk factors for musculoskeletal and venous disorders. Basic understanding of prolonged standing physiology is lacking. We therefore plan to investigate the influence of multiple hours standing on lower limb oedema measured by waterplethysmography (WP) and bioelectrical impedance (BI) and lower leg musle fatigue using muscle twitch force (MTF). In order to interpret our results, test-retest and inter-rater reliability of these measurement methods was evaluated first...
March 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28296645/extraction-of-respiratory-signals-from-the-electrocardiogram-and-photoplethysmogram-technical-and-physiological-determinants
#10
Peter H Charlton, Timothy Bonnici, Lionel Tarassenko, Jordi Alastruey, David Clifton, Richard Beale, Peter Watkinson
Breathing rate (BR) can be estimated by extracting respiratory signals from the electrocardiogram (ECG) or photoplethysmogram (PPG). The extracted respiratory signals may be influenced by several technical and physiological factors. In this study, our aim was to determine how technical and physiological factors influence the quality of respiratory signals. Using a variety of techniques 15 respiratory signals were extracted from the ECG, and 11 from PPG signals collected from 57 healthy subjects. The quality of each respiratory signal was assessed by calculating its correlation with a reference oral-nasal pressure respiratory signal using Pearson's correlation coefficient...
March 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28294957/regional-ventilation-redistribution-measured-by-electrical-impedance-tomography-during-spontaneous-breathing-trial-with-automatic-tube-compensation
#11
Yeong-Long Hsu, Ai-Jia Tien, Mei-Yun Chang, Hao-Tai Chang, Knut Moeller, Inez Frerichs, Zhanqi Zhao
Automatic tube compensation (ATC) was developed to overcome the flow resistance of endotracheal tube and decrease the imposed work of breathing. Although ATC is used as an evidence-based strategy to predict successful weaning from assisted ventilation, the changes in regional ventilation distribution induced by this technique are not known. We hypothesized that continuous positive airway pressure plus ATC (CPAP+100%ATC) could reactivate the respiratory muscles in patients with prolonged mechanical ventilation (PMV) more effectively than volume assist-control mandatory ventilation (ACMV)...
March 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28291744/consequences-of-short-interruptions-of-bouts-of-walking-on-estimates-of-compliance-to-physical-activity-guidelines
#12
Juliet Ann Harvey, Danny Rafferty, Sebastien Chastin
INTRODUCTION: Current guidelines on physical activity suggest that 30 mins of moderate intensity physical activity can be accumulated in continuous bouts of at least 10 mins. It has been shown by use of activity monitoring that it is difficult to achieve 10 mins of completely uninterrupted walking in the free-living urban environment where we have obstacles such as roads to cross. The aim of this study was to examine the effect of short interruptions in walking on the rate of oxygen uptake (ml·kg·min-1) to determine if walking with short interruptions can still be considered continuous...
March 14, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28282027/feasibility-of-backprojection-method-for-reconstruction-of-low-contrast-perturbations-in-a-conducting-background-in-magnetic-induction-tomography
#13
Alexander V Korjenevsky, Sergey Sapetsky
Application of the backprojection image reconstruction algorithm in magnetic induction tomography for imaging of low contrast inclusions in conductive background is investigated. Both numerical simulation and experimental results demonstrate that spatial redistribution of the sensitivity of measurements related with background conductivity does not affect the projection lines and keeps possibility of backprojection image reconstruction what is important in biomedical applications of MIT. The reconstruction algorithm is explained in detail...
March 10, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28282026/comparative-study-of-separation-between-ex-vivo-prostatic-malignant-and-benign-tissue-using-electrical-impedance-spectroscopy-and-electrical-impedance-tomography
#14
Ethan K Murphy, Aditya Mahara, Shadab Khan, Elias Hyams, Alan Schned, Jason Pettus, Ryan Halter
Currently no efficient and reliable technique exists to routinely assess surgical margins during a radical prostatectomy. Electrical impedance spectroscopy (EIS) has been reported as a potential technique to provide surgeons with real-time intraoperative margin assessment. In addition to providing a quantified measure of margin status, a co-registered electrical impedance tomography (EIT) image presented on a surgeon's workstation could add value to the margin assessment process. To investigate this, we conducted a comparative study between EIS and EIT to evaluate the potential these technologies might have for margin assessment...
March 10, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28263183/complexity-of-cardiovascular-rhythms-during-head-up-tilt-test-by-entropy-of-patterns
#15
Dorota Wejer, Beata Graff, Danuta Makowiec, Szymon Budrejko, Zbiginiew Struzik
The head-up tilt (HUT) test, which provokes transient dynamical alterations in the regulation of cardiovascular system, provides insights into complex organization of this system. Based on signals with heart period intervals (RR-intervals) and/or systolic blood pressure (SBP), differences in the cardiovascular regulation between vasovagal patients (VVS) and the healthy people group (CG) are investigated. Short-term relations among signal data represented symbolically by three-beat patterns allow to qualify and quantify the complexity of the cardiovascular regulation by Shannon entropy...
March 6, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28263182/increased-cardiorespiratory-coordination-in-preeclampsia
#16
Karsten Berg, Jan Kraemer, Maik Riedl, Holger Stepan, Juergen Kurths, Niels Wessel
Preeclampsia is one of the main sources of morbidity in pregnancy with a high mortality rate without a known ultimate cause. Using a corpus including 927 measurements of pregnant women with and without different hypertonic diseases at multiple stages of pregnancy, we utilised a new approach to analyse cardiorespiratory coordination. Since the recording quality of respiratory effort was limited due to a high signal to noise ratio, we applied an ECG derived respiration approach to create an ersatz respiratory signal...
March 6, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28248198/rem-sleep-estimation-based-on-autonomic-dynamics-using-r-r-intervals
#17
Heenam Yoon, Su Hwan Hwang, Jae-Won Choi, Yu Jin Lee, Do-Un Jeong, Kwang Suk Park
OBJECTIVE: We developed an automatic algorithm to determine rapid eye movement (REM) sleep on the basis of the autonomic activities reflected in heart rate variations. APPROACH: The heart rate variability (HRV) parameters were calculated using the R-R intervals from an electrocardiogram (ECG). A major autonomic variation associated with the sleep cycle was extracted from a combination of the obtained parameters. REM sleep was determined with an adaptive threshold applied to the acquired feature...
March 1, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28248197/calibration-of-the-sup-125-sup-i-induced-x-ray-fluorescence-spectrometry-based-system-of-i-in-vivo-i-bone-strontium-determinations-using-hydroxyapatite-as-a-phantom-material-a-simulation-study
#18
Eric Da Silva, Ana Pejovic-Milic
The calibration of <i>in vivo</i> X-ray fluorescence systems of bone strontium quantification, based on <sup>125</sup>I excitation, is dependent on a coherent normalization procedure. Application of this procedure with the use of plaster of Paris (poP) as a phantom material requires the application of a coherent conversion factor (CCF) to make the calibration functions transferable between the phantom material and human bone. In this work we evaluate, with the use of Monte Carlo simulation, the potential benefit of employing a newly developed hydroxyapatite phantom material into the calibration protocol...
March 1, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28248195/the-comparisons-between-thermography-and-ultrasonography-with-physical-examination-for-wrist-joint-assessment-in-juvenile-idiopathic-arthritis
#19
Butsabong Lerkvaleekul, Suphaneewan Jaovisidha, Witaya Sungkarat, Niyata Chitrapazt, Praman Fuangfa, Thumanoon Ruangchaijatuporn, Soamarat Vilaiyuk
This study aimed to assess infrared thermography (IRT) and ultrasonography (US) for detecting wrist arthritis in juvenile idiopathic arthritis (JIA) patients. Although IRT could help us detecting joint inflammation, IRT studies in JIA patients with wrist arthritis are still limited. Currently, no validated US criteria exist for detecting arthritis, and the most useful parameters between Gray-scale ultrasound (GSUS) or Power Doppler ultrasound (PDUS) remain unclear. Therefore, this study focused on detecting wrist arthritis in varying degrees using IRT and US compared with physical examination...
March 1, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28248191/bioimpedance-measurement-based-evaluation-of-wound-healing
#20
Atte Kekonen, Mikael Bergelin, Jan-Erik Eriksson, Annikki Vaalasti, Heimo Ylänen, Jari Viik
OBJECTIVE: Our group has developed a bipolar bioimpedance measurement-based method for determining the state of wound healing. The objective of this study was to assess the capability of the method. METHODS: To assess the performance of the method, we arranged a follow-up study of four acute wounds. The wounds were measured using the method and photographed throughout the healing process. RESULTS: Initially the bioimpedance of the wounds was significantly lower than the impedance of the undamaged skin, used as a baseline...
March 1, 2017: Physiological Measurement
journal
journal
31341
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"