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https://www.readbyqxmd.com/read/27906705/arterial-pressure-variation-in-elective-noncardiac-surgery-identifying-reference-distributions-and-modifying-factors
#1
Michael R Mathis, Samuel A Schechtman, Milo C Engoren, Amy M Shanks, Aleda Thompson, Sachin Kheterpal, Kevin K Tremper
BACKGROUND: Assessment of need for intravascular volume resuscitation remains challenging for anesthesiologists. Dynamic waveform indices, including systolic and pulse pressure variation, are demonstrated as reliable measures of fluid responsiveness for mechanically ventilated patients. Despite widespread use, real-world reference distributions for systolic and pulse pressure variation values have not been established for euvolemic intraoperative patients. The authors sought to establish systolic and pulse pressure variation reference distributions and assess the impact of modifying factors...
December 1, 2016: Anesthesiology
https://www.readbyqxmd.com/read/27865190/effect-of-potassium-supplementation-on-vascular-function-a-meta-analysis-of-randomized-controlled-trials
#2
Xixiang Tang, Bingyuan Wu, Yanting Luo, Long Peng, Yanming Chen, Jieming Zhu, Chaoquan Peng, Suhua Li, Jinlai Liu
BACKGROUND: Effects of potassium supplementation on vascular function remain conflicting. This meta-analysis aimed to summarized current literature to fill the gaps in knowledge. METHODS: A literature search was performed on PubMed database through April, 2016. The measurements of vascular function included pulse wave velocity (PWV), augmentation index (AI), pulse pressure (PP), flow mediated dilatation (FMD), glycerol trinitrate responses (GTN), and intercellular cell adhesion molecule-1 (ICAM-1)...
November 2, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27860389/efficacy-and-safety-of-two-dosages-of-canrenone-as-add-on-therapy-in-hypertensive-patients-taking-ace-inhibitors-or-angiotensin-ii-receptor-blockers-and-hydrochlorothiazide-at-maximum-dosage-in-a-randomized-clinical-trial-the-escape-it-trial
#3
Giuseppe Derosa, Pamela Maffioli, Maria D'Avino, Carla Sala, Amedeo Mugellini, Vito Vulpis, Salvatore Felis, Luigina Guasti, Riccardo Sarzani, Alessandro Bestetti, Massimo Vanasia, Giovanni Gaudio
AIM: To evaluate the effects of canrenone as add-on therapy in patients already treated with angiotensin converting-enzyme inhibitors (ACE-I) or angiotensin II receptor blockers (ARBs) and hydrochlorothiazide at the maximum dosage (25 mg/day). METHOD: In this randomized, open label, controlled trial, we enrolled 175 Caucasian patients with essential hypertension not well controlled by concomitant ACE-I or ARBs and hydrochlorothiazide. At baseline 87 patients (57 males and 30 females) were randomized to add canrenone 50 mg, and 88 (56 males and 32 females) patients to canrenone 100 mg, once a day, for three months...
November 12, 2016: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/27858374/prediction-of-fluid-responsiveness-an-update
#4
REVIEW
Xavier Monnet, Paul E Marik, Jean-Louis Teboul
In patients with acute circulatory failure, the decision to give fluids or not should not be taken lightly. The risk of overzealous fluid administration has been clearly established. Moreover, volume expansion does not always increase cardiac output as one expects. Thus, after the very initial phase and/or if fluid losses are not obvious, predicting fluid responsiveness should be the first step of fluid strategy. For this purpose, the central venous pressure as well as other "static" markers of preload has been used for decades, but they are not reliable...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/27837303/prediction-of-fluid-responsiveness-using-pulse-pressure-variation-in-infants-undergoing-ventricular-septal-defect-repair-with-median-sternotomy-or-minimally-invasive-right-thoracotomy
#5
Ding Han, Ya-Guang Liu, Yi Luo, Jia Li, Chuan Ou-Yang
Fluid management is challenging in infants after cardiopulmonary bypass. Pulse pressure variation (PPV) derived from pressure recording analytical method (PRAM) is based on lung-heart interaction during mechanical ventilation. A prospective observational study conducted in operating room tested PPV to predict fluid responsiveness in ventricular septal defect infants. Infants in open chest conditions with median sternotomy (n = 26) or minimally invasive right thoracotomy (n = 29) undergoing ventricular septal defect repair were enrolled...
November 11, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27816391/the-coupling-between-peripheral-microcirculation-and-slow-breathing
#6
Zehava Ovadia-Blechman, Benjamin Gavish, Danit Levy-Aharoni, David Shashar, Vered Aharonson
Vasomotion (rhythmic changes in arteriolar diameter) is believed to enhance tissue perfusion at low oxygenation levels. We hypothesized that slow breathing and vasomotion may correlate temporally ("coupling"), especially at low oxygenation levels. We paced down spontaneous breathing to about 5 or 6breaths/min in 14 healthy subjects using device-guided breathing (DGB), and continuously monitored respiration, transcutaneous oxygen pressure ("oxygenation"), and skin capillary blood flow ("microflow") using a laser Doppler flowmeter...
November 2, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27778115/influence-of-dentin-thickness-on-intrapulpal-temperature-under-simulated-pulpal-pressure-during-nd-yag-laser-irradiation
#7
L R Santis, T M Silva, B A Haddad, L L Gonçalves, S E P Gonçalves
The aim of this study was to evaluate the effects of dentin thickness and pulpal pressure simulation (PPS) on the variation of intrapulpal temperature (∆T) when submitted to an adhesive technique using laser irradiation. Sixty sound human molars were sectioned and randomly divided into two groups (n = 30): group 1-1 mm of dentin thickness; group 2-2 mm of dentin thickness. Each group was divided into two subgroups (n = 15): subgroup A-absence of PPS; subgroup P-presence of PPS (15 cm H2O), sequentially treated with the following: 37 % phosphoric acid, adhesive system (Adper Single Bond), irradiation with Nd:YAG laser (1064 nm, 10 Hz, 60 s) using 60, 80, and 100 mJ/pulse energy parameters and light-curing (10 s)...
October 24, 2016: Lasers in Medical Science
https://www.readbyqxmd.com/read/27759579/oral-magnesium-supplementation-improves-endothelial-function-and-attenuates-subclinical-atherosclerosis-in-thiazide-treated-hypertensive-women
#8
Ana Rosa Cunha, Jenifer D'El-Rei, Fernanda Medeiros, Bianca Umbelino, Wille Oigman, Rhian M Touyz, Mario F Neves
BACKGROUND: Epidemiological studies demonstrate an inverse association between serum magnesium and incidence of cardiovascular disease. Diuretics commonly cause hypomagneseamia. METHOD: We evaluated effects of magnesium supplementation on blood pressure (BP) and vascular function in thiazide-treated hypertensive women in a randomized, double-blind, clinical trial. Hypertensive women (40-65 years) on hydrochlorothiazide and mean 24-h BP at least 130/80 mmHg were divided into placebo and supplementation (magnesium chelate 600 mg/day) groups...
January 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/27754264/os-37-07-could-flow-mediated-slowing-constitute-a-methodological-alternative-to-the-conventional-echo-tracking-flow-mediated-dilation-technique-for-the-evaluation-of-endothelial-function-preliminary-results
#9
Telmo Pereira, Armindo Almeida, João Maldonado, Jorge Conde
OBJECTIVE: The Moens-Korteweg equation predicts changes in pulse wave velocity (PWV) following changes in arterial radius, therefore an increase in arterial radius, as seen in a reactive hyperaemia (RH) condition, should slow PWV over a given arterial segment. If this assumption is true, than the deceleration of PWV over the brachial artery (flow-mediated slowing - FMS) should be an equivalent signal of endothelial function during a conventional RH flow-mediated dilation (FMD) procedure...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27753856/hw-01-4-cardioankle-vascular-index-cavi-in-hypertension
#10
Kohji Shirai
BACKGROUND: The cardio-ankle vascular index (CAVI) is a new arterial stiffness index of the arterial tree from the origin of the aorta to the ankle, and was essentially derived from the stiffness parameterβtheory proposed by Hayashi. The conspicuous feature of CAVI is independency from blood pressure at the time of measurement. AIM: The purpose is to clarify the meaning of CAVI as a surrogate marker of arteriosclerosis, and also the role of CAVI in the blood pressure control system...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27745777/seasonal-variation-in-spontaneous-cervical-artery-dissection-comparing-between-uk-and-australian-sites
#11
Lucy C Thomas, Lesley Ann Hall, John R Attia, Elizabeth G Holliday, Hugh S Markus, Christopher R Levi
BACKGROUND: Cervical artery dissection (CAD) is a leading cause of stroke among middle-aged adults, but the etiology is unclear. Some reports of seasonal variation in CAD incidence have been suggested but may reflect extreme climatic conditions. Seasonal variation may implicate more transient seasonal causes such as proinflammatory or hypercoagulable states. This study aimed to assess whether CAD incidence varied with season between UK and Australian sites. Also, this study aimed to determine whether there was a different pattern of seasonal variation between arteries (carotid and vertebral) and any association between CAD incidence and clinical factors...
October 10, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27685182/a-robust-and-subject-specific-hemodynamic-model-of-the-lower-limb-based-on-non-invasive-arterial-measurements
#12
Laurent Dumas, Tamara El Bouti, Didier Lucor
Cardiovascular diseases are currently the leading cause of mortality in the population of developed countries, due to the constant increase in cardiovascular risk factors. Numerous prospective and retrospective studies have shown that arterial stiffening is a relevant predictor of these diseases. Unfortunately, arterial stiffness distribution across the human body is difficult to measure experimentally. We propose a numerical approach to determine the arterial stiffness distribution of an arterial network using a subject-specific one-dimensional model...
September 29, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27668570/plasma-inactivation-of-microorganisms-on-sprout-seeds-in-a-dielectric-barrier-discharge
#13
Denis Butscher, Hanne Van Loon, Alexandra Waskow, Philipp Rudolf von Rohr, Markus Schuppler
Fresh produce is frequently contaminated by microorganisms, which may lead to spoilage or even pose a threat to human health. In particular sprouts are considered to be among the most risky foods sold at retail since they are grown in an environment practically ideal for growth of bacteria and usually consumed raw. Because heat treatment has a detrimental effect on the germination abilities of sprout seeds, alternative treatment technologies need to be developed for microbial inactivation purposes. In this study, non-thermal plasma decontamination of sprout seeds is evaluated as a promising option to enhance food safety while maintaining the seed germination capabilities...
December 5, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27643229/os-37-07-could-flow-mediated-slowing-constitute-a-methodological-alternative-to-the-conventional-echo-tracking-flow-mediated-dilation-technique-for-the-evaluation-of-endothelial-function-preliminary-results
#14
Telmo Pereira, Armindo Almeida, João Maldonado, Jorge Conde
OBJECTIVE: The Moens-Korteweg equation predicts changes in pulse wave velocity (PWV) following changes in arterial radius, therefore an increase in arterial radius, as seen in a reactive hyperaemia (RH) condition, should slow PWV over a given arterial segment. If this assumption is true, than the deceleration of PWV over the brachial artery (flow-mediated slowing - FMS) should be an equivalent signal of endothelial function during a conventional RH flow-mediated dilation (FMD) procedure...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27643093/hw-01-4-cardioankle-vascular-index-cavi-in-hypertension
#15
Kohji Shirai
BACKGROUND: The cardio-ankle vascular index (CAVI) is a new arterial stiffness index of the arterial tree from the origin of the aorta to the ankle, and was essentially derived from the stiffness parameterβtheory proposed by Hayashi. The conspicuous feature of CAVI is independency from blood pressure at the time of measurement. AIM: The purpose is to clarify the meaning of CAVI as a surrogate marker of arteriosclerosis, and also the role of CAVI in the blood pressure control system...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27635767/effect-of-rbc-transfusion-on-sublingual-microcirculation-in-hemorrhagic-shock-patients-a-pilot-study
#16
Sebastien Tanaka, Etienne Escudier, Sophie Hamada, Anatole Harrois, Pierre Etienne Leblanc, Eric Vicaut, Jacques Duranteau
OBJECTIVES: The effects of RBC transfusion on microvascular perfusion are not well documented. We investigated the effect of RBC transfusion on sublingual microcirculation in hemorrhagic shock patients. DESIGN: Prospective, preliminary observational study. SETTINGS: A 28-bed, surgical ICU in a university hospital. PATIENTS: Fifteen hemorrhagic shock patients requiring RBC transfusion. INTERVENTION: Transfusion of one unit of RBCs...
September 15, 2016: Critical Care Medicine
https://www.readbyqxmd.com/read/27624389/a-simple-adaptive-transfer-function-for-deriving-the-central-blood-pressure-waveform-from-a-radial-blood-pressure-waveform
#17
Mingwu Gao, William C Rose, Barry Fetics, David A Kass, Chen-Huan Chen, Ramakrishna Mukkamala
Generalized transfer functions (GTFs) are available to compute the more relevant central blood pressure (BP) waveform from a more easily measured radial BP waveform. However, GTFs are population averages and therefore may not adapt to variations in pulse pressure (PP) amplification (ratio of radial to central PP). A simple adaptive transfer function (ATF) was developed. First, the transfer function is defined in terms of the wave travel time and reflection coefficient parameters of an arterial model. Then, the parameters are estimated from the radial BP waveform by exploiting the observation that central BP waveforms exhibit exponential diastolic decays...
September 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27624218/ventilator-induced-central-venous-pressure-variation-can-predict-fluid-responsiveness-in-post-operative-cardiac-surgery-patients
#18
T G V Cherpanath, B F Geerts, J J Maas, R B P de Wilde, A B Groeneveld, J R Jansen
BACKGROUND: Ventilator-induced dynamic hemodynamic parameters such as stroke volume variation (SVV) and pulse pressure variation (PPV) have been shown to predict fluid responsiveness in contrast to static hemodynamic parameters such as central venous pressure (CVP). We hypothesized that the ventilator-induced central venous pressure variation (CVPV) could predict fluid responsiveness. METHODS: Twenty-two elective cardiac surgery patients were studied post-operatively on the intensive care unit during mechanical ventilation with tidal volumes of 6-8 ml/kg without spontaneous breathing efforts or cardiac arrhythmia...
November 2016: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/27610307/the-radius-of-influence-of-a-combined-method-of-in-situ-air-sparging-and-soil-vapor-extraction-in-the-intertidal-sediments-of-gomso-bay-on-the-west-coast-of-south-korea
#19
Jun-Ho Lee, Han Jun Woo, Kap-Sik Jeong, Kap-Song Park
BACKGROUND: In situ air sparging (IAS) was undertaken at sites in the tidal flats of Mandol and Hajeon, on the west coast of South Korea, to estimate variations in the radius of influence (ROI). RESULTS: The Mandol core sample consisted of sand and muddy sand 1.6-3.4 [Formula: see text] (average 2.3 [Formula: see text]) and contained water (average 15.10 %). The Hajeon core sample consisted of muddy sand, sandy silt, and muddy sandy gravel 1.31-4.44 [Formula: see text] (average 3...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27609188/pulse-pressure-variation-shows-a-direct-linear-correlation-with-tidal-volume-in-anesthetized-healthy-patients
#20
Yi Liu, Jing-Sheng Lou, Wei-Dong Mi, Wei-Xiu Yuan, Qiang Fu, Min Wang, Jing Qu
BACKGROUND: The settings of mechanical ventilation, like tidal volume (VT), occasionally need to be adjusted in the process of anesthesia for some special reasons. The aim of this study was therefore to assess the relationship between pulse pressure variations (PPVs) in different settings of VT in anesthetized healthy patients under mechanical ventilation. METHODS: Sixty nine ASA I-II patients scheduled for gastrointestinal surgery under general anesthesia were included in this prospective study...
2016: BMC Anesthesiology
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