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https://www.readbyqxmd.com/read/29761092/validation-of-a-piezoelectric-sensor-array-based-device-for-measurement-of-carotid-femoral-pulse-wave-velocity-the-philips-prototype
#1
Shao-Kun Xu, Xiang-Fei Hong, Yi-Bang Cheng, Chang-Yuan Liu, Yan Li, Bin Yin, Ji-Guang Wang
Background: Multiple piezoelectric pressure mechanotransducers topologized into an array might improve efficiency and accuracy in collecting arterial pressure waveforms for measurement of pulse wave velocity (PWV). Objective: In the present study, we validated a piezoelectric sensor array-based prototype (Philips) against the validated and clinically widely used Complior device (Alam Medical). Methods: We recruited 33 subjects with a wide distribution of PWV...
March 2018: Pulse (Basel, Switzerland)
https://www.readbyqxmd.com/read/29744245/reliability-of-passive-leg-raising-stroke-volume-variation-and-pulse-pressure-variation-to-predict-fluid-responsiveness-during-weaning-from-mechanical-ventilation-after-cardiac-surgery-a-prospective-observational-study
#2
Christoph Karl Hofer, Martin Geisen, Sonja Hartnack, Omer Dzemali, Michael Thomas Ganter, Andreas Zollinger
Objective: During assisted ventilation and spontaneous breathing, functional haemodynamic parameters, including stroke volume variation (SVV) and pulse pressure variation (PPV), are of limited value to predict fluid responsiveness, and the passive leg raising (PLR) manoeuvre has been advocated as a surrogate method. We aimed to study the predictive value of SVV, PPV and PLR for fluid responsiveness during weaning from mechanical ventilation after cardiac surgery. Methods: Haemodynamic variables and fluid responsiveness were assessed in 34 patients...
April 2018: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/29743101/individualized-perioperative-hemodynamic-goal-directed-therapy-in-major-abdominal-surgery-ipegasus-trial-study-protocol-for-a-randomized-controlled-trial
#3
Sandra Funcke, Bernd Saugel, Christian Koch, Dagmar Schulte, Thomas Zajonz, Michael Sander, Angelo Gratarola, Lorenzo Ball, Paolo Pelosi, Savino Spadaro, Riccardo Ragazzi, Carlo Alberto Volta, Thomas Mencke, Amelie Zitzmann, Benedikt Neukirch, Gonzalo Azparren, Marta Giné, Vicky Moral, Hans Otto Pinnschmidt, Oscar Díaz-Cambronero, Maria Jose Alberola Estelles, Marisol Echeverri Velez, Maria Vila Montañes, Javier Belda, Marina Soro, Jaume Puig, Daniel Arnulf Reuter, Sebastian Alois Haas
BACKGROUND: Postoperative morbidity and mortality in patients undergoing surgery is high, especially in patients who are at risk of complications and undergoing major surgery. We hypothesize that perioperative, algorithm-driven, hemodynamic therapy based on individualized fluid status and cardiac output optimization is able to reduce mortality and postoperative moderate and severe complications as a major determinant of the patients' postoperative quality of life, as well as health care costs...
May 9, 2018: Trials
https://www.readbyqxmd.com/read/29721645/midazolam-increases-preload-dependency-during-endotoxic-shock-in-rabbits-by-affecting-venous-vascular-tone
#4
Jianxiao Chen, Tao Yu, Federico Longhini, Xiwen Zhang, Songqiao Liu, Ling Liu, Yi Yang, Haibo Qiu
BACKGROUND: Septic patients often require sedation in intensive care unit, and midazolam is one of the most frequently used sedatives among them. But the interaction between midazolam and septic shock is not known. The aim of this study is to investigate the effects of midazolam on preload dependency in an endotoxic shock model by evaluating systemic vascular tone and cardiac function. METHODS: Eighteen rabbits were randomly divided into three groups: Control group, MID1 group and MID2 group...
May 2, 2018: Annals of Intensive Care
https://www.readbyqxmd.com/read/29721013/changes-in-hepatic-blood-flow-and-liver-function-during-closed-abdominal-hyperthermic-intraperitoneal-chemotherapy-following-cytoreduction-surgery
#5
Stéphanie Dupont, Eduardo R C Schiffer, Marion J White, John R A Diaper, Marc-Joseph Licker, Philippe C Masouyé
Background: The increase in intra-abdominal pressure (IAP) during closed abdominal hyperthermic intraperitoneal chemotherapy (HIPEC) leads to major haemodynamic changes and potential organ dysfunction. We investigated these effects on hepatic blood flow (HBF) and liver function in patients undergoing HIPEC following cytoreductive surgery and fluid management guided by dynamic preload indices. Methods: In this prospective observational clinical study including 15 consecutive patients, we evaluated HBF by transesophageal echocardiography and liver function by determination of the indocyanine green plasma disappearance rate (ICG-PDR)...
2018: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/29714440/the-impact-of-visit-to-visit-systolic-blood-pressure-variability-on-residual-renal-function-and-left-ventricular-hypertrophy-in-peritoneal-dialysis-patients
#6
Jun-Ping Tian, Hong Wang, Xin-Kui Tian, Feng-He Du, Tao Wang
Background/aim: Blood pressure (BP) variability is more closely associated with adverse outcomes than ‘usual’ BP in the general population. Residual renal function (RRF) and left ventricular hypertrophy (LVH) are thought to be predictors of poor outcome in dialysis patients. However, only a few studies have focused on BP variation and its link to RRF, LVH, and outcome in peritoneal dialysis (PD) patients. Therefore, we aimed to explore the effect of visit-to-visit BP variability on RRF and LVH in continuous ambulatory PD (CAPD) patients...
April 30, 2018: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/29713049/maximum-home-blood-pressure-readings-are-associated-with-left-atrial-diameter-in-essential-hypertensives
#7
Toshiki Kaihara, Yuki Imaizumi, Kazuo Eguchi, Kazuomi Kario
We tested the hypothesis that the maximum value of home systolic BP (MSBP) is a marker of hypertensive target organ damage (TOD). We conducted a cross-sectional study of 220 hypertensives. The subjects performed HBP monitoring using a telemonitoring system and measured their HBP for 7 days. Mean, maximum, standard deviation, and coefficient of variation of SBPs were used as independent variables. Brachial-ankle pulse wave velocity, left ventricular mass index (LVMI), mean carotid intima-media thickness, and left atrial diameter index (LADI) were used as dependent variables...
May 1, 2018: Journal of Human Hypertension
https://www.readbyqxmd.com/read/29687672/volume-expansion-and-variation-in-hemodynamic-parameters
#8
Frank Daniel Martos-Benítez, Bertha Inés Guzmán-Breff
OBJECTIVES: To assess correlations among variations in hemodynamic parameters during fluid volume loading. MATERIAL AND METHODS: Prospective observational study in 2 intensive care units. Sixty patients requiring intravenous fluids underwent challenge tests with 300 mL of crystalloids over a 48-hour period. Percent change in hemodynamic parameters after infusion was measured. We used hierarchical cluster and principal component analyses to explore correlations among changes in hemodynamic responses...
June 2018: Emergencias: Revista de la Sociedad Española de Medicina de Emergencias
https://www.readbyqxmd.com/read/29679768/comparison-of-proaqt-pulsioflex%C3%A2-and-oesophageal-doppler-for-intraoperative-haemodynamic-monitoring-during-intermediate-risk-abdominal-surgery
#9
Grégoire Weil, Cyrus Motamed, Alexandre Eghiaian, Xavier Monnet, Stéphanie Suria
OBJECTIVE: To compare cardiac index (CI) between Proaqt/PulsioFlex® and esophageal Doppler (OD) and the ability of the PulsioFlex® to track CI changes induced by fluid challenge and secondly to assess the impact of the time interval between two auto-calibrations of PulsioFlex® on the accuracy of the measured CI. METHODS: In a single hospital, 49 intermediate-risk oncologic abdominal surgery patients were included in an observational study. We measured the cardiac Index (CI) provided by OD and by the Proaqt/PulsioFlex® before and after internal calibration, which were performed randomly at specific intervals after the initial one (30, 60, 90 and 120min)...
April 18, 2018: Anaesthesia, Critical Care & Pain Medicine
https://www.readbyqxmd.com/read/29677212/pulsatile-operation-of-a-continuous-flow-right-ventricular-assist-device-rvad-to-improve-vascular-pulsatility
#10
Boon C Ng, Matthias Kleinheyer, Peter A Smith, Daniel Timms, William E Cohn, Einly Lim
Despite the widespread acceptance of rotary blood pump (RBP) in clinical use over the past decades, the diminished flow pulsatility generated by a fixed speed RBP has been regarded as a potential factor that may lead to adverse events such as vasculature stiffening and hemorrhagic strokes. In this study, we investigate the feasibility of generating physiological pulse pressure in the pulmonary circulation by modulating the speed of a right ventricular assist device (RVAD) in a mock circulation loop. A rectangular pulse profile with predetermined pulse width has been implemented as the pump speed pattern with two different phase shifts (0% and 50%) with respect to the ventricular contraction...
2018: PloS One
https://www.readbyqxmd.com/read/29651955/increases-in-peripheral-systolic-pressure-levels-and-z-score-associate-gradual-aortic-pressure-increase-and-functional-arterial-impairment-in-children-and-adolescents
#11
Yanina Zocalo, Mariana Marin, Santiago Curcio, Victoria Garcia-Espinosa, Pedro Chiesa, Gustavo Giachetto, Edmundo I Cabrera-Fischer, Daniel Bia
BACKGROUND: Arterial changes associated with children and adolescents high blood pressure (HBP) states would vary depending on the arterial type, arterial indexes considered and/or on blood pressure (BP) levels. AIMS: To determine in children and adolescents: 1) if there is gradual structural-functional arterial impairment associated with gradual peripheral (brachial) systolic BP (pSBP) level or z-score increases, and 2) whether subjects with HBP levels and those with normal BP differ in the profiles of arterial changes associated with pSBP deviations...
April 13, 2018: Current Hypertension Reviews
https://www.readbyqxmd.com/read/29644558/finger-and-forehead-photoplethysmography-derived-pulse-pressure-variation-and-the-benefits-of-baseline-correction
#12
Shaoxiong Sun, Wouter H Peeters, Rick Bezemer, Xi Long, Igor Paulussen, Ronald M Aarts, Gerrit J Noordergraaf
To non-invasively predict fluid responsiveness, respiration-induced pulse amplitude variation (PAV) in the photoplethysmographic (PPG) signal has been proposed as an alternative to pulse pressure variation (PPV) in the arterial blood pressure (ABP) signal. However, it is still unclear how the performance of the PPG-derived PAV is site-dependent during surgery. The aim of this study is to compare finger- and forehead-PPG derived PAV in their ability to approach the value and trend of ABP-derived PPV. Furthermore, this study investigates four potential confounding factors, (1) baseline variation, (2) PPV, (3) ratio of respiration and heart rate, and (4) perfusion index, which might affect the agreement between PPV and PAV...
April 11, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29611112/sedation-practices-in-gastrointestinal-endoscopy-a-survey-from-southern-india
#13
Prakash Zacharias, Shibi Mathew, John Mathews, Aby Somu, Maya Peethambaran, Menon Prashanth, Mathew Philip
Gastrointestinal endoscopies can cause an unpleasant experience for the patient. In India, most endoscopists follow a common institutional policy for sedation. The aim of this study was to analyze the sedation practices in various endoscopy centers across southern India. Data were collected with the help of a structured questionnaire given to a senior endoscopist of the center. Data from the completed questionnaire were later analyzed. Data were obtained from 19 centers across southern India. All endoscopy suites had central oxygen supply and emergency cart...
April 3, 2018: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
https://www.readbyqxmd.com/read/29604762/a-compact-nanosecond-pulse-generator-for-dbd-tube-characterization
#14
S K Rai, A K Dhakar, U N Pal
High voltage pulses of very short duration and fast rise time are required for generating uniform and diffuse plasma under various operating conditions. Dielectric Barrier Discharge (DBD) has been generated by high voltage pulses of short duration and fast rise time to produce diffuse plasma in the discharge gap. The high voltage pulse power generators have been chosen according to the requirement for the DBD applications. In this paper, a compact solid-state unipolar pulse generator has been constructed for characterization of DBD plasma...
March 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29599937/a-novel-interpretation-for-arterial-pulse-pressure-amplification-in-health-and-disease
#15
Manuel R Alfonso, Ricardo L Armentano, Leandro J Cymberknop, Arthur R Ghigo, Franco M Pessana, Walter E Legnani
Arterial pressure waves have been described in one dimension using several approaches, such as lumped (Windkessel) or distributed (using Navier-Stokes equations) models. An alternative approach consists of modeling blood pressure waves using a Korteweg-de Vries (KdV) equation and representing pressure waves as combinations of solitons. This model captures many key features of wave propagation in the systemic network and, in particular, pulse pressure amplification (PPA), which is a mechanical biomarker of cardiovascular risk...
2018: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29596398/ultra-uniform-pb-0-865-la-0-09-zr-0-65-ti-0-35-o%C3%A2-thin-films-with-tunable-optical-properties-fabricated-via-pulsed-laser-deposition
#16
Shenglin Jiang, Chi Huang, Honggang Gu, Shiyuan Liu, Shuai Zhu, Ming-Yu Li, Lingmin Yao, Yunyi Wu, Guangzu Zhang
Ferroelectric thin films have been utilized in a wide range of electronic and optical applications, in which their morphologies and properties can be inherently tuned by a qualitative control during growth. In this work, we demonstrate the evolution of the Pb0.865 La0.09 (Zr0.65 Ti0.35 )O₃ (PLZT) thin films on MgO (200) with high uniformity and optimized optical property via the controls of the deposition temperatures and oxygen pressures. The perovskite phase can only be obtained at the deposition temperature above 700 °C and oxygen pressure over 50 Pa due to the improved crystallinity...
March 29, 2018: Materials
https://www.readbyqxmd.com/read/29582991/a-capacitive-pressure-sensor-with-high-sensitivity-and-fast-response-to-dynamic-interaction-based-on-graphene-and-porous-nylon-networks
#17
Zhongfu He, Wenjun Chen, Binghao Liang, Changyong Liu, Leilei Yang, Dongwei Lu, Zichao Mo, Hai Zhu, Zikang Tang, Xuchun Gui
Flexible pressure sensors are of great importance to be applied in artificial intelligence and wearable electronics. However, assembling a simple structure, high performance capacitive pressure sensor, especially for the monitoring of the flow of liquid, is still a big challenge. Here, based on a sandwich-like structure, we propose a facile capacitive pressure sensor optimized by a flexible, low-cost nylon netting, showing many merits including high response sensitivity (0.33 kPa-1) in a low-pressure regime (< 1 kPa), ultralow detection limit as 3...
March 27, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29581913/respiratory-rate-variability-as-a-prognostic-factor-in-hospitalized-patients-transferred-to-the-intensive-care-unit
#18
Daniel Garrido, Justin J Assioun, Anahit Keshishyan, Marcos A Sanchez-Gonzalez, Bishoy Goubran
Introduction Increasing mortality rates within the intensive care unit (ICU) is an ever growing problem, ultimately leading to increases in the cost of healthcare expenditures. Currently, there are attempts to use guidelines in the hospital setting to predict overall mortality in critically ill patients. However, a predictor of subsequent ICU admissions remains to be explored. Recent data has shown the importance of monitoring respiratory rate variability (RRV) as a useful predictor of the deterioration of patients...
January 23, 2018: Curēus
https://www.readbyqxmd.com/read/29569112/phenylephrine-increases-cardiac-output-by-raising-cardiac-preload-in-patients-with-anesthesia-induced-hypotension
#19
A F Kalmar, S Allaert, P Pletinckx, J-W Maes, J Heerman, J J Vos, M M R F Struys, T W L Scheeren
Induction of general anesthesia frequently induces arterial hypotension, which is often treated with a vasopressor, such as phenylephrine. As a pure α-agonist, phenylephrine is conventionally considered to solely induce arterial vasoconstriction and thus increase cardiac afterload but not cardiac preload. In specific circumstances, however, phenylephrine may also contribute to an increase in venous return and thus cardiac output (CO). The aim of this study is to describe the initial time course of the effects of phenylephrine on various hemodynamic variables and to evaluate the ability of advanced hemodynamic monitoring to quantify these changes through different hemodynamic variables...
March 22, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29565685/acute-effects-of-repeated-bouts-of-aerobic-exercise-on-arterial-stiffness-after-glucose-ingestion
#20
Ryota Kobayashi, Yuto Hashimoto, Hiroyuki Hatakeyama, Takanobu Okamoto
The aim of this study was to investigate the acute repeated bouts of aerobic exercise decrease leg arterial stiffness. However, the influence of repeated bouts of aerobic exercise on arterial stiffness after glucose ingestion is unknown. The present study investigates the acute effects of repeated bouts of aerobic exercise on arterial stiffness after the 75-g oral glucose tolerance test (OGTT). Ten healthy young men (age, 23.2 ± 0.9 years) performed repeated bouts of aerobic exercise trial (RE, 65% peak oxygen uptake; two 15 min bouts of cycling performed 20 min apart) and control trial (CON, seated and resting in a quiet room) at 80 min before the 75-g OGTT on separate days in a randomized, controlled crossover fashion...
March 22, 2018: Clinical and Experimental Hypertension: CHE
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