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Pulse pressure variation

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https://www.readbyqxmd.com/read/28365237/contributions-of-aortic-pulse-wave-velocity-and-backward-wave-pressure-to-variations-in-left-ventricular-mass-are-independent-of-each-other
#1
Hamza Bello, Gavin R Norton, Imraan Ballim, Carlos D Libhaber, Pinhas Sareli, Angela J Woodiwiss
Aortic pulse wave velocity (PWV) and backward waves, as determined from wave separation analysis, predict cardiovascular events beyond brachial blood pressure. However, the extent to which these aortic hemodynamic variables contribute independent of each other is uncertain. In 749 randomly selected participants of African ancestry, we therefore assessed the extent to which relationships between aortic PWV or backward wave pressures (Pb) (and hence central aortic pulse pressure [PPc]) and left ventricular mass index (LVMI) occur independent of each other...
March 14, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28340536/comparison-of-broad-vs-narrow-focal-width-lithotripter-fields
#2
Yifei Xing, Tony T Chen, W Neal Simmons, Georgy Sankin, F Hadley Cocks, Michael Eric Lipkin, Glenn M Preminger, Pei Zhong
Objective To investigate the impact of lithotripter focal width on stone fragmentation. Materials and Methods A modified reflector was used to reduce -6 dB beam size of the HM3 lithotripter while increasing concomitantly peak pressure. Fragmentation in vitro was assessed with modified and original reflectors using BegoStone phantoms. A membrane holder was used to mimic lithotripsy in vivo and a matrix holder was used to assess variations of fragmentation power in the focal plane of the lithotripter field. Stone fragmention in vivo produced by the two reflectors was further compared in a swine model...
March 24, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28320434/use-of-tidal-volume-challenge-to-improve-the-reliability-of-pulse-pressure-variation
#3
REVIEW
Sheila Nainan Myatra, Xavier Monnet, Jean-Louis Teboul
This article is one of ten reviews selected from the Annual Update in Intensive Care and Emergency Medicine 2017. Other selected articles can be found online at http://ccforum.com/series/annualupdate2017 . Further information about the Annual Update in Intensive Care and Emergency Medicine is available from http://www.springer.com/series/8901 .
March 21, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28299589/respiratory-variation-in-peak-aortic-velocity-accurately-predicts-fluid-responsiveness-in-children-undergoing-neurosurgery-under-general-anesthesia
#4
Kavita G Morparia, Srijaya K Reddy, Laura J Olivieri, Michael C Spaeder, Jennifer J Schuette
The determination of fluid responsiveness in the critically ill child is of vital importance, more so as fluid overload becomes increasingly associated with worse outcomes. Dynamic markers of volume responsiveness have shown some promise in the pediatric population, but more research is needed before they can be adopted for widespread use. Our aim was to investigate effectiveness of respiratory variation in peak aortic velocity and pulse pressure variation to predict fluid responsiveness, and determine their optimal cutoff values...
March 16, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28287995/parameters-extracted-from-arterial-pulse-waves-as-markers-of-atherosclerotic-changes-performance-and-repeatability
#5
Mikko Peltokangas, Anca A Telembeci, Jarmo Verho, Ville M Mattila, Pekka Romsi, Antti Vehkaoja, Jukka Lekkala, Niku Oksala
Arterial diseases are significant and increasing cause of mortality and morbidity. In this study, we analyze and compare the discrimination capability of different arterial pulse wave (PW) based indices, both earlier proposed and novel ones, for describing the vascular health. The repeatability of the indices is also evaluated. Both volume PWs and dynamic pressure PWs are recorded by using photoplethysmographic and electromechanical film (EMFi) sensors connected to a wireless body sensor network. The study population consists of 82 subjects, 30 atherosclerotic patients and 52 control subjects...
March 8, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28269222/single-source-photoplethysmograph-transducer-for-local-pulse-wave-velocity-measurement
#6
P M Nabeel, Jayaraj Joseph, Vartika Awasthi, Mohanasankar Sivaprakasam
Cuffless evaluation of arterial blood pressure (BP) using pulse wave velocity (PWV) has received attraction over the years. Local PWV based techniques for cuffless BP measurement has more potential in accurate estimation of BP parameters. In this work, we present the design and experimental validation of a novel single-source Photoplethysmograph (PPG) transducer for arterial blood pulse detection and cycle-to-cycle local PWV measurement. The ability of the transducer to continuously measure local PWV was verified using arterial flow phantom as well as by conducting an in-vivo study on 17 volunteers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269217/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#7
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28253850/pulmonary-hypertension-attenuates-the-dynamic-preload-indicators-increase-during-experimental-hypovolemia
#8
Juan P Bouchacourt, Juan Riva, Juan C Grignola
BACKGROUND: Pulse pressure (PPV) and stroke volume (SVV) variations may not be reliable in the setting of pulmonary hypertension and/or right ventricular (RV) failure. We hypothesized that RV afterload increase attenuates SVV and PPV during hypovolemia in a rabbit model of pulmonary embolism (PE) secondary to RV dysfunction. METHODS: Seven anesthetized and mechanically ventilated rabbits were studied during four experimental conditions: normovolemia, blood withdrawal, pulmonary embolism and fluid loading of a colloidal solution...
March 3, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28239454/transcriptional-analysis-of-blandm-1-and-copy-number-alteration-under-carbapenem-stress
#9
Deepjyoti Paul, Amitabha Bhattacharjee, Dibyojyoti Bhattacharjee, Debadatta Dhar, Anand Prakash Maurya, Atanu Chakravarty
BACKGROUND: New Delhi metallo beta-lactamase is known to compromise carbapenem therapy and leading to treatment failure. However, their response to carbapenem stress is not clearly known. Here, we have investigated the transcriptional response of blaNDM-1 and plasmid copy number alteration under carbapenem exposure. METHODS: Three blaNDM-1 harboring plasmids representing three incompatibility types (IncFIC, IncA/C and IncK) were inoculated in LB broth with and without imipenem, meropenem and ertapenem...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28231259/impact-of-seasonality-and-air-pollutants-on-carotid-femoral-pulse-wave-velocity-and-wave-reflection-in-hypertensive-patients
#10
Marina Di Pilla, Rosa Maria Bruno, Francesco Stea, Luciano Massetti, Stefano Taddei, Lorenzo Ghiadoni, Pietro Amedeo Modesti
OBJECTIVE: The effects of seasonality on blood pressure (BP) and cardiovascular (CV) events are well established, while the influence of seasonality and other environmental factors on arterial stiffness and wave reflection has never been analyzed. This study evaluated whether seasonality (daily number of hours of light) and acute variations in outdoor temperature and air pollutants may affect carotid-femoral pulse wave velocity (PWV) and pressure augmentation. DESIGN AND METHOD: 731 hypertensive patients (30-88 years, 417 treated) were enrolled in a cross-sectional study during a 5-year period...
2017: PloS One
https://www.readbyqxmd.com/read/28227452/single-source-photoplethysmograph-transducer-for-local-pulse-wave-velocity-measurement
#11
P M Nabeel, Jayaraj Joseph, Vartika Awasthi, Mohanasankar Sivaprakasam, P M Nabeel, Jayaraj Joseph, Vartika Awasthi, Mohanasankar Sivaprakasam, P M Nabeel, Mohanasankar Sivaprakasam, Vartika Awasthi, Jayaraj Joseph
Cuffless evaluation of arterial blood pressure (BP) using pulse wave velocity (PWV) has received attraction over the years. Local PWV based techniques for cuffless BP measurement has more potential in accurate estimation of BP parameters. In this work, we present the design and experimental validation of a novel single-source Photoplethysmograph (PPG) transducer for arterial blood pulse detection and cycle-to-cycle local PWV measurement. The ability of the transducer to continuously measure local PWV was verified using arterial flow phantom as well as by conducting an in-vivo study on 17 volunteers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227447/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#12
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, S F Rimoldi, E Muntane, J Sola, M Lemay, A Adler, J-Ph Thiran, F Braun
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28218962/survey-of-neonatal-resuscitation-practices-showed-post-training-improvements-but-need-to-reinforce-preterm-management-monitoring-and-adrenaline-use
#13
Montserrat Izquierdo, Martín Iriondo, César Ruiz, Gonzalo Zeballos, Miguel Sánchez, Eva Gonzalez, Máximo Vento, Marta Thió
AIM: Neonatal resuscitation surveys have showed practice variations between countries, centres and levels of care. We evaluated delivery room practices after a nationwide neonatal resuscitation training programme focused on non-tertiary centres. METHODS: A 2012 survey sent to all Spanish hospitals handling deliveries covered staff availability and training, equipment and practices in the delivery room and during transfers to neonatal intensive care units. The results from 98 centres that had completed a previous survey in 2007 were analysed by levels of care...
February 20, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28212057/pulse-pressure-variation-don-t-throw-the-baby-with-the-bathwater
#14
Sheila Nainan Myatra, Natesh R Prabu, Jigeeshu Vasishtha Divatia
No abstract text is available yet for this article.
February 17, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28210935/the-effect-of-fluid-resuscitation-on-the-effective-circulating-volume-in-patients-undergoing-liver-surgery-a-post-hoc-analysis-of-a-randomized-controlled-trial
#15
Jaap Jan Vos, A F Kalmar, H G D Hendriks, J Bakker, T W L Scheeren
To assess the significance of an analogue of the mean systemic filling pressure (Pmsa) and its derived variables, in providing a physiology based discrimination between responders and non-responders to fluid resuscitation during liver surgery. A post-hoc analysis of data from 30 patients undergoing major hepatic surgery was performed. Patients received 15 ml kg(-1) fluid in 30 min. Fluid responsiveness (FR) was defined as an increase of 20% or greater in cardiac index, measured by FloTrac-Vigileo(®). Dynamic preload variables (pulse pressure variation and stroke volume variation: PPV, SVV) were recorded additionally...
February 16, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28207430/evaluation-of-augmented-pulse-pressure-variation-using-the-valsalva-manoeuvre-as-a-predictor-of-fluid-responsiveness-under-open-chest-conditions-a-prospective-observational-study
#16
Jeong Jin Min, Tae Kyong Kim, Jong-Hwan Lee, Jiyeon Park, Hyun Sung Cho, Wook Sung Kim, Young Tak Lee
BACKGROUND: Pulse pressure variation (PPV) is a well known dynamic preload indicator of fluid responsiveness. However, its usefulness in open-chest conditions remains controversial. OBJECTIVE: We evaluated whether augmented PPV during a Valsalva manoeuvre can predict fluid responsiveness after sternotomy. DESIGN: A prospective, observational study. SETTING: Single-centre trial, study period from October 2014 to June 2015...
May 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28135402/-study-of-the-effect-of-water-pressure-on-plasma-and-cavitation-bubble-induced-by-pulsed-laser-ablation-in-liquid-plal-of-silver-and-missed-variations-of-observable-nps-features
#17
Marcella Dell'Aglio, Antonio Santagata, Gabriele Valenza, Angelo De Stradis, Alessandro De Giacomo
In this work the effects of the pressure between 1-150 Bar on Pulsed Laser Ablation in Liquids (PLAL) during the production of Silver Nanoparticles (AgNPs) in water was investigated. The produced NPs are the results of two different well-known stages which are the plasma and the bubble evolution occurring until the generated material is released into the solution. The main aim of this work is to show which roles is played by the variation of water pressure on the laser induced plasma and the cavitation bubble dynamics during the NPs formation...
January 30, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28115510/abnormal-wave-reflections-and-left-ventricular-hypertrophy-late-after-coarctation-of-the-aorta-repair
#18
Michael A Quail, Rebekah Short, Bejal Pandya, Jennifer A Steeden, Abbas Khushnood, Andrew M Taylor, Patrick Segers, Vivek Muthurangu
Patients with repaired coarctation of the aorta are thought to have increased afterload due to abnormalities in vessel structure and function. We have developed a novel cardiovascular magnetic resonance protocol that allows assessment of central hemodynamics, including central aortic systolic blood pressure, resistance, total arterial compliance, pulse wave velocity, and wave reflections. The main study aims were to (1) characterize group differences in central aortic systolic blood pressure and peripheral systolic blood pressure, (2) comprehensively evaluate afterload (including wave reflections) in the 2 groups, and (3) identify possible biomarkers among covariates associated with elevated left ventricular mass (LVM)...
March 2017: Hypertension
https://www.readbyqxmd.com/read/28098965/continuous-tuning-of-phase-transition-temperature-in-vo2-thin-films-on-c-cut-sapphire-substrates-via-strain-variation
#19
Jie Jian, Xuejing Wang, Leigang Li, Meng Fan, Wenrui Zhang, Jijie Huang, Zhimin Qi, Haiyan Wang
Vanadium dioxide (VO2) thin films with controlled thicknesses are deposited on c-cut sapphire substrates with Al-doped ZnO (AZO) buffer layers by pulsed laser deposition. The surface roughness of AZO buffer layers is varied by controlling oxygen pressure during growth. The strain in the VO2 lattice is found to be dependent on the VO2 thickness and the VO2/AZO interface roughness. The semiconductor-to-metal transition (SMT) properties of VO2 thin films are characterized and the transition temperature (Tc) is successfully tuned by the VO2 thickness as well as the VO2/AZO interface roughness...
February 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28086939/feasibility-study-for-the-non-invasive-blood-pressure-estimation-based-on-ppg-morphology-normotensive-subject-study
#20
Hangsik Shin, Se Dong Min
BACKGROUND: Blood pressure is a critical bio-signal and its importance has been increased with the aged society and the growth of cardiovascular disease population. However, most of hypertensive patients have been suffered the inconvenience in monitoring blood pressure in daily life because the measurement of the blood pressure depends on the cuff-based technique. Nowadays there are many trials to measure blood pressure without cuff, especially, photoplethysmography (PPG) based research is carried out in various ways...
January 10, 2017: Biomedical Engineering Online
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