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Pulse pressure variation

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https://www.readbyqxmd.com/read/29330589/impact-of-valve-less-vs-standard-insufflation-on-pneumoperitoneum-volume-inflammation-and-peritoneal-physiology-in-a-laparoscopic-sigmoid-resection-experimental-model
#1
Michele Diana, Eric Noll, Andras Legnèr, Seong-Ho Kong, Yu-Yin Liu, Luigi Schiraldi, Francesco Marchegiani, Jordan Bano, Bernard Geny, Anne-Laure Charles, Bernard Dallemagne, Véronique Lindner, Didier Mutter, Pierre Diemunsch, Jacques Marescaux
BACKGROUND: Standard insufflators compensate for intra-abdominal pressure variations with pressure spikes. Our aim was to evaluate the impact of a stable, low-pressure pneumoperitoneum induced by a valve-less insufflator, on working space, hemodynamics, inflammation, and peritoneal physiology, in a model of laparoscopic sigmoid resection. MATERIALS AND METHODS: Twelve pigs (47 ± 3.3 kg) were equipped for invasive hemodynamic monitoring and randomly assigned to Standard (n = 6) vs...
January 12, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29316186/organ-damage-changes-in-patients-with-resistant-hypertension-randomized-to-renal-denervation-or-spironolactone-the-denervhta-denervaci%C3%A3-n-en-hipertensi%C3%A3-n-arterial-study
#2
Anna Oliveras, Pedro Armario, Laia Sans, Albert Clarà, Susana Vázquez, Luis Molina, Júlia Pareja, Alejandro de la Sierra, Julio Pascual
Renal denervation and spironolactone have both been proposed for the treatment of resistant hypertension, but their effects on preclinical target organ damage have not been compared. Twenty-four patients with 24-hour systolic blood pressure ≥140 mm Hg despite receiving three or more full-dose antihypertensive drugs, one a diuretic, were randomized to receive spironolactone or renal denervation. Changes in 24-hour blood pressure, urine albumin excretion, arterial stiffness, carotid intima-media thickness, and left ventricular mass index were evaluated at 6 months...
January 5, 2018: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/29305128/motion-sensitized-sprite-measurements-of-hydrodynamic-cavitation-in-fast-pipe-flow
#3
Alexander Adair, Igor V Mastikhin, Benedict Newling
The pressure variations experienced by a liquid flowing through a pipe constriction can, in some cases, result in the formation of a bubble cloud (i.e., hydrodynamic cavitation). Due to the nature of the bubble cloud, it is ideally measured through the use of non-optical and non-invasive techniques; therefore, it is well-suited for study by magnetic resonance imaging. This paper demonstrates the use of Conical SPRITE (a 3D, centric-scan, pure phase-encoding pulse sequence) to acquire time-averaged void fraction and velocity information about hydrodynamic cavitation for water flowing through a pipe constriction...
January 2, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29287945/mechanisms-of-pulse-pressure-amplification-dipping-pattern-during-sleep-time-the-safar-study
#4
Antonios A Argyris, Efthimia Nasothimiou, Evaggelia Aissopou, Theodoros G Papaioannou, Yi Zhang, Jacques Blacher, Michel E Safar, Petros P Sfikakis, Athanase D Protogerou
The difference in pulse pressure (PP) between peripheral arteries and the aorta, called pulse pressure amplification (PPamp), is a well-described physiological phenomenon independently associated with cardiovascular events. Recent studies suggest that it exhibits circadian variability. Our aim was to detect the factors associated with the circadian variability of PPamp. In 497 consecutive subjects (aged 54 years, 56.7% male, 79.7% hypertensives), we assessed the circadian pattern of peripheral and central arterial hemodynamics by 24-hour evaluation of brachial and aortic blood pressure (BP), augmentation index (AI), and pulse wave velocity (PWV) using a validated oscillometric device (Mobil-O-Graph)...
December 14, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/29238433/improvement-of-diurnal-blood-pressure-variation-by-azilsartan
#5
Keisuke Okamura, Kazuyuki Shirai, Tetsu Okuda, Hidenori Urata
Background: Azilsartan is an angiotensin II receptor blocker with a potent antihypertensive effect. Methods: In a multicenter, prospective, open-label study, 265 patients with poor blood pressure control despite treatment with other angiotensin II receptor blockers were switched to 20 mg/day of azilsartan (patients on standard dosages) or 40 mg/day of azilsartan (patients on high dosages). Results: Blood pressure was 149/83 mm Hg before switching and was significantly reduced from 1 month after switching until final assessment (132/76 mm Hg, P < 0...
January 2018: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/29216963/psychophysiological-effects-of-bamboo-plants-on-adults
#6
Ahmad Hassan, Qi Bing Chen, Tao Jiang, Bing Yang Lyu, Nian Li, Shu Li, Zi Yue Shangguan, Yun Ting Li, Zhou Li Jun, Qian Luo, Xin Yi Chen, Yi Yan Wang, Cheng Cheng Zeng, Jun Yang, Muhammad Sohaib Tahir
The present study was conducted to clarify the psychophysiological relaxation effects of viewing bamboo on university students. Forty healthy Chinese participants enrolled in this study to clarify the psychophysiological relaxation effects of viewing bamboo. The effects of visual stimulation using a pot both with and without a bamboo were recorded by measuring the student's blood pressure, EEG and STAI. We observed that viewing bamboo plants resulted in significantly lower systolic (female, P < 0.001; male, P < 0...
November 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29208025/change-in-cardiac-output-during-trendelenburg-maneuver-is-a-reliable-predictor-of-fluid-responsiveness-in-patients-with-acute-respiratory-distress-syndrome%C3%A2-in-the-prone-position-under-protective-ventilation
#7
Hodane Yonis, Laurent Bitker, Mylène Aublanc, Sophie Perinel Ragey, Zakaria Riad, Floriane Lissonde, Aurore Louf-Durier, Sophie Debord, Florent Gobert, Romain Tapponnier, Claude Guérin, Jean-Christophe Richard
BACKGROUND: Predicting fluid responsiveness may help to avoid unnecessary fluid administration during acute respiratory distress syndrome (ARDS). The aim of this study was to evaluate the diagnostic performance of the following methods to predict fluid responsiveness in ARDS patients under protective ventilation in the prone position: cardiac index variation during a Trendelenburg maneuver, cardiac index variation during an end-expiratory occlusion test, and both pulse pressure variation and change in pulse pressure variation from baseline during a tidal volume challenge by increasing tidal volume (VT) to 8 ml...
December 5, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29203173/evaluation-of-the-dynamic-predictors-of-fluid-responsiveness-in-dogs-receiving-goal-directed-fluid-therapy
#8
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...
June 17, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29202543/-experts-consensus-on-the-management-of-the-right-heart-function-in-critically-ill-patients
#9
X T Wang, D W Liu, H M Zhang, Y Long, X D Guan, H B Qiu, K J Yu, J Yan, H Zhao, Y Q Tang, X Ding, X C Ma, W Du, Y Kang, B Tang, Y H Ai, H W He, D C Chen, H Chen, W Z Chai, X Zhou, N Cui, H Wang, X Rui, Z J Hu, J G Li, Y Xu, Y Yang, B Ouyan, H Y Lin, Y M Li, X Y Wan, R L Yang, Y Z Qin, Y G Chao, Z Y Xie, R H Sun, Z Y He, D F Wang, Q Q Huang, D P Jiang, X Y Cao, R G Yu, X Wang, X K Chen, J F Wu, L N Zhang, M G Yin, L X Liu, S W Li, Z J Chen, Z Luo
To establish the experts consensus on the right heart function management in critically ill patients. The panel of consensus was composed of 30 experts in critical care medicine who are all members of Critical Hemodynamic Therapy Collaboration Group (CHTC Group). Each statement was assessed based on the GRADE (Grading of Recommendations Assessment, Development, and Evaluation) principle. Then the Delphi method was adopted by 52 experts to reassess all the statements. (1) Right heart function is prone to be affected in critically illness, which will result in a auto-exaggerated vicious cycle...
December 1, 2017: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/29201997/cardiac-rehabilitation-in-patients-with-cardiovascular-disease-leads-various-hemodynamic-parameters-obtained-using-simple-non-invasive-tests-to-their-appropriate-levels
#10
Makito Futami, Kanta Fujimi, Takashi Ueda, Takuro Matsuda, Masaomi Fujita, Kouji Kaino, Maaya Sakamoto, Tomoe Horita, Rie Koyoshi, Tadaaki Arimura, Yuhei Shiga, Takashi Kuwano, Ken Kitajima, Keijiro Saku, Shin-Ichiro Miura
We evaluated whether comprehensive cardiac rehabilitation (CR) in patients with cardiovascular disease (CVD) could improve various hemodynamic parameters obtained using simple non-invasive tests. We analyzed 48 CVD patients with (n = 38, CR group) or without (n = 10, non-CR group) a CR program, and prospectively followed them for 12 months. Various parameters were measured at baseline and after 12 months using 3 simple non-invasive tests: blood pressure (BP) and severity of atherosclerosis [arterial velocity pulse index (AVI) and atrial pressure volume index] were determined using PASESA®, an index of total autonomic nerve activity and a coefficient of variation of the R-R interval (CVRR) were determined using eHEART®, and the total peripheral resistance, stroke volume and cardiac index (CI) were determined using nico®...
December 2017: IJC Heart & Vasculature
https://www.readbyqxmd.com/read/29189276/perioperative-noninvasive-blood-pressure-monitoring
#11
Kai Kuck, Philip D Baker
The most commonly monitored variable for perioperative hemodynamic management is blood pressure. Several indirect noninvasive blood pressure monitoring techniques have been developed over the last century, including intermittent techniques such as auscultation (Riva-Rocci and Korotkoff) and oscillometry (Marey) and continuous techniques. With the introduction of automated noninvasive blood pressure devices in the 1970s, the oscillometric technique quickly became and remains the standard for automated, intermittent blood pressure measurement...
November 17, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29149433/predictive-values-of-pulse-pressure-variation-and-stroke-volume-variation-for-fluid-responsiveness-in-patients-with-pneumoperitoneum
#12
Marko Zlicar, Vesna Novak-Jankovic, Rok Blagus, Maurizio Cecconi
Animal studies suggest that dynamic predictors remain useful in patients with pneumoperitoneum, but human data is conflicting. Our aim was to determine predictive values of pulse pressure variation (PPV) and stroke volume variation (SVV) in patients with pneumoperitoneum using LiDCORapid™ haemodynamic monitor. Standardised fluid challenges of colloid were administered to patients undergoing laparoscopic procedures, one fluid challenge per patient. Intra-abdominal pressure was automatically held at 12 mmHg...
November 17, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29141045/csf-in-the-ventricles-of-the-brain-behaves-as-a-relay-medium-for-arteriovenous-pulse-wave-phase-coupling
#13
William E Butler, Pankaj K Agarwalla, Patrick Codd
The ventricles of the brain remain perhaps the largest anatomic structure in the human body without established primary purpose, even though their existence has been known at least since described by Aristotle. We hypothesize that the ventricles help match a stroke volume of arterial blood that arrives into the rigid cranium with an equivalent volume of ejected venous blood by spatially configuring cerebrospinal fluid (CSF) to act as a low viscosity relay medium for arteriovenous pulse wave (PW) phase coupling...
2017: PloS One
https://www.readbyqxmd.com/read/29136608/variation-of-the-korotkoff-stethoscope-sounds-during-blood-pressure-measurement-analysis-using-a-convolutional-neural-network
#14
Fan Pan, Peiyu He, Chengyu Liu, Taiyong Li, Alan Murray, Dingchang Zheng
Korotkoff sounds are known to change their characteristics during blood pressure (BP) measurement, resulting in some uncertainties for systolic and diastolic pressure (SBP and DBP) determinations. The aim of this study was to assess the variation of Korotkoff sounds during BP measurement by examining all stethoscope sounds associated with each heartbeat from above systole to below diastole during linear cuff deflation. Three repeat BP measurements were taken from 140 healthy subjects (age 21 to 73 years; 62 female and 78 male) by a trained observer, giving 420 measurements...
November 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/29123389/alveolar-capillary-reserve-during-exercise-in-patients-with-chronic-obstructive-pulmonary-disease
#15
Mehrdad Behnia, Courtney M Wheatley, Alberto Avolio, Bruce D Johnson
Background: Factors limiting exercise in patients with COPD are complex. With evidence for accelerated pulmonary vascular aging, destruction of alveolar-capillary bed, and hypoxic pulmonary vasoconstriction, the ability to functionally expand surface area during exercise may become a primary limitation. Purpose: To quantify measures of alveolar-capillary recruitment during exercise and the relationship to exercise capacity in a cohort of COPD patients. Methods: Thirty-two subjects gave consent (53% male, with mean ± standard deviation age 66±9 years, smoking 35±29 pack-years, and Global Initiative for Chronic Obstructive Lung Disease (GOLD) classification of 0-4: 2...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29113716/plethysmography-variability-index-for-prediction-of-fluid-responsiveness-during-graded-haemorrhage-and-transfusion-in-sevoflurane-anaesthetized-mechanically-ventilated-dogs
#16
Yusuke Endo, Koudai Kawase, Taku Miyasho, Tadashi Sano, Kazuto Yamashita, William W Muir
OBJECTIVE: To examine the accuracy of plethysmography variability index (PVI) as a noninvasive indicator of fluid responsiveness in hypovolaemic dogs. STUDY DESIGN: Prospective experimental study. ANIMALS: Six adult healthy sevoflurane-anaesthetized Beagle dogs. METHODS: Dogs were anaesthetized with 1.3-fold their individual minimum alveolar concentration of sevoflurane. The lungs were mechanically ventilated after neuromuscular blockade with vecuronium bromide...
November 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29095262/diurnal-variation-of-pulse-waveform-parameters-determined-by-laser-speckle-flowgraphy-on-the-optic-nerve-head-in-healthy-subjects
#17
Marie Fukami, Takeshi Iwase, Kentaro Yamamoto, Eimei Ra, Kenta Murotani, Hiroko Terasaki
To investigate the diurnal variation of the pulse waveform parameters determined by laser speckle flowgraphy (LSFG) on the optic nerve head (ONH) in healthy subjects.This prospective cross sectional study was conducted at Nagoya University Hospital. We studied 13 healthy volunteers whose mean age was 33.5 ± 7.6 years. Eight pulse waveform parameters on the ONH were determined by LSFG (LSFG-NAVI) every 3 hours from 6 AM to 12 PM. The intraocular pressure (IOP), systolic (SBP) and diastolic (DBP) blood pressure, and heart rate (HR) in the brachial artery were also recorded...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29064375/on-algorithms-for-calculating-arterial-pulse-pressure-variation-during-major-surgery
#18
Shaoxiong Sun, Wouter H Peeters, Rick Bezemer, Xi Long, Igor Paulussen, Ronald M Aarts, Gerrit J Noordergraaf
OBJECTIVE: Arterial pulse pressure variation (PPV) is widely used for predicting fluid responsiveness and supporting fluid management in the operating room and intensive care unit. Available PPV algorithms have been typically validated for fluid responsiveness during episodes of hemodynamic stability. Yet, little is known about the performance of PPV algorithms during surgery, where fast changes of the blood pressure may affect the robustness of the presented PPV value. This work provides a comprehensive understanding of how various existing algorithmic designs affect the robustness of the presented PPV value during surgery, and proposes additional processing for the pulse pressure signal before calculating PPV...
November 30, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29060346/coherence-analysis-of-invasive-blood-pressure-and-its-noninvasive-indicators-for-improvement-of-cuffless-measurement-accuracy
#19
Xiao-Rong Ding, Bryan P Yan, Yuan-Ting Zhang, Jing Liu, Peng Su, Ni Zhao
Cuffless technology for blood pressure (BP) measurement offers great potential for unobtrusive monitoring of hypertension. However, the accuracy is still a challenging issue probably owning to the inadequacy of existing noninvasive BP indicators in tracking BP changes, i.e., either the poor trackability of the indicators or the lack of relationship to map the indicators to BP. To figure out the covariation of BP-related noninvasive indicators and BP, we propose to analyze the coherence of intra-arterial systolic BP (SBP) and a selected group of noninvasive indicators, including the mostly used pulse transit time (PTT), photoplethysmogram intensity ratio (PIR) and RR interval (RRI) of electrocardiogram (ECG), in both time domain, with singular spectrum analysis (SSA), and frequency domain, with cross-spectral analysis...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060318/a-novel-blood-pressure-estimation-method-combing-pulse-wave-transit-time-model-and-neural-network-model
#20
Jun Xu, Jiehui Jiang, Hucheng Zhou, Zhuangzhi Yan
Blood Pressure (BP) measurement can assist doctors to assess patients' cardiovascular status and diagnose heart diseases. Pulse Wave Transit Time (PWTT) model is one frequently used BP estimation method to monitor BP continuously in clinics. However, individual variations may influence the measurement accuracy of PWTT model. Focusing on above promble, this paper proposes a novel BP estimation method combining a classical PWTT model and a neural network model. The novel method is composed of five steps: signal pre-processing, feature extraction, initial PWTT model selection, model correction by neural network model, and final PWTT model identification...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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