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https://www.readbyqxmd.com/read/28821794/a-twice-electrochemical-etching-method-to-fabricate-superhydrophobic-superhydrophilic-patterns-for-biomimetic-fog-harvest
#1
Xiaolong Yang, Jinlong Song, Junkai Liu, Xin Liu, Zhuji Jin
Superhydrophobic-superhydrophilic patterned surfaces have attracted more and more attention due to their great potential applications in the fog harvest process. In this work, we developed a simple and universal electrochemical-etching method to fabricate the superhydrophobic-superhydrophilic patterned surface on metal superhydrophobic substrates. The anti-electrochemical corrosion property of superhydrophobic substrates and the dependence of electrochemical etching potential on the wettability of the fabricated dimples were investigated on Al samples...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814000/preliminary-study-of-a-robotic-foot-ankle-prosthesis-with-active-alignment
#2
Andrew K LaPre, Ryan D Wedge, Brian R Umberger, Frank C Sup
Robotic prosthetic foot-ankle prostheses typically aim to replace the lost joint with revolute joints aimed at replicating normal joint biomechanics. In this paper, a previously developed robotic ankle prosthesis with active alignment is evaluated. It uses a four-bar mechanism to inject positive power into the gait cycle while altering the kinematics of the ankle joint and pylon segment to reduce loading on the residual limb. In a single-subject biomechanics analysis, there was a 10% reduction in peak limb pressures and evidence of greater gait symmetry in ground reaction forces when active alignment was implemented compared to walking with the daily use prosthesis...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28809670/cardio-pulmonary-stethoscope-clinical-validation-with-heart-failure-and-hemodialysis-patients
#3
Magdy F Iskander, Todd B Seto, Ruthsenne Rg Perron, Eunjung Lim, Farhan Qazi
OBJECTIVE: The purpose of this study is to evaluate the accuracy of a noninvasive radiofrequency-based device, the Cardio-Pulmonary Stethoscope (CPS), to monitor heart and respiration rates and detect changes in lung water content in human experiments and clinical trials. METHODS: Three human populations (healthy subjects (n=4), heart failure (n=12) and hemodialysis (n=13) patients) were enrolled in this study. The study was conducted at the University of Hawaii and The Queen's Medical Center in Honolulu, HI...
August 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28806628/complete-step-section-microscopic-study-of-a-swan-ganz-catheter-related-pulmonary-artery-rupture-a-frequently-lethal-complication-that-to-our-knowledge-has-not-had-a-comprehensive-microscopic-examination-case-report-and-literature-review
#4
Ya Xu, L Clarke Stout
BACKGROUND: Introduced in 1970, the Swan-Ganz catheter (SGC) soon became widely used because of its unique usefulness in managing intensive care patients. Unfortunately, SGC usage was complicated by pulmonary artery rupture (PAR) with a 50% mortality rate that led to a near banning of the SCG in the late 1980s. Increasing knowledge and decreasing incidence of SGC-related PARs (SGPARs) led to the current feeling that the present SGPAR incidence is now low enough to tolerate given the lives saved by SGC usage...
July 4, 2017: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
https://www.readbyqxmd.com/read/28805343/rest-and-exercise-hemodynamic-and-metabolic-findings-in-active-duty-soldiers-referred-for-cardiac-catheterization-to-exclude-heart-disease-insights-from-past-invasive-cardiopulmonary-exercise-testing-using-multisensor-high-fidelity-catheters
#5
James A Watts, Faith R Kelly, Terry D Bauch, Joseph P Murgo, Bernard J Rubal
OBJECTIVE: This study describes results of iCPET from the past, which used submaximal stress and multisensor high-fidelity catheters to exclude heart disease in a unique population of young adults. BACKGROUND: There has been resurgence in comprehensive hemodynamic evaluation of complex cardiovascular patients. Although dynamic assessments during cardiac catheterization have become commonplace, there remains limited information regarding left and right heart hemodynamic changes during supine exercise in young adults...
May 8, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28754567/usefulness-of-pulse-amplitude-changes-during-the-valsalva-maneuver-measured-using-finger-photoplethysmography-to-identify-elevated-pulmonary-capillary-wedge-pressure-in-patients-with-heart-failure
#6
Nisha A Gilotra, Ryan J Tedford, Ilan S Wittstein, Gayane Yenokyan, Kavita Sharma, Stuart D Russell, Harry A Silber
The pulse amplitude ratio, the ratio of pulse pressure at the end of a Valsalva maneuver to before the onset of Valsalva, correlates with filling pressure. This study aimed to noninvasively estimate cardiac filling pressure in patients with heart failure. We developed a noninvasive handheld device to measure pulse amplitude ratio using finger photoplethysmography. In 69 patients who underwent right heart catheterization, photoplethysmography waveforms were recorded during a standardized Valsalva maneuver, and in 60 of these patients, pulse amplitude ratio was able to be calculated...
June 28, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28753621/mechanical-versus-humoral-determinants-of-brain-death-induced-lung-injury
#7
Asmae Belhaj, Laurence Dewachter, Sandrine Rorive, Myriam Remmelink, Birgit Weynand, Christian Melot, Emeline Hupkens, Céline Dewachter, Jacques Creteur, Kathleen Mc Entee, Robert Naeije, Benoît Rondelet
BACKGROUND: The mechanisms of brain death (BD)-induced lung injury remain incompletely understood, as uncertainties persist about time-course and relative importance of mechanical and humoral perturbations. METHODS: Brain death was induced by slow intracranial blood infusion in anesthetized pigs after randomization to placebo (n = 11) or to methylprednisolone (n = 8) to inhibit the expression of pro-inflammatory mediators. Pulmonary artery pressure (PAP), wedged PAP (PAWP), pulmonary vascular resistance (PVR) and effective pulmonary capillary pressure (PCP) were measured 1 and 5 hours after Cushing reflex...
2017: PloS One
https://www.readbyqxmd.com/read/28738087/exercise-physiology-with-a-left-ventricular-assist-device-analysis-of-heart-pump-interaction-with-a-computational-simulator
#8
Libera Fresiello, Frank Rademakers, Piet Claus, Gianfranco Ferrari, Arianna Di Molfetta, Bart Meyns
Patients with a Ventricular Assist Device (VAD) are hemodynamically stable but show an impaired exercise capacity. Aim of this work is to identify and to describe the limiting factors of exercise physiology with a VAD. We searched for data concerning exercise in heart failure condition and after VAD implantation from the literature. Data were analyzed by using a cardiorespiratory simulator that worked as a collector of inputs coming from different papers. As a preliminary step the simulator was used to reproduce the evolution of hemodynamics from rest to peak exercise (ergometer cycling) in heart failure condition...
2017: PloS One
https://www.readbyqxmd.com/read/28727703/intrathecal-morphine-improves-hemodynamic-parameters-and-analgesia-in-patients-undergoing-aortic-valve-replacement-surgery-a-prospective-double-blind-randomized-trial
#9
Hamed Elgendy, Hatem A R Helmy
BACKGROUND: Intrathecal morphine (ITM) has been used in hopes of providing good postoperative analgesia in cardiac surgery. Little is known about its use in isolated aortic valve replacement surgery. OBJECTIVES: To evaluate the effects of 7 µ/kg ITM administration in aortic valve replacement in regards to hemodynamics, pain score, and postoperative complications when compared to general anesthesia alone. STUDY DESIGN: A randomized, double-blind trial...
July 2017: Pain Physician
https://www.readbyqxmd.com/read/28722077/invasive-haemodynamic-evaluation-of-the-pulmonary-circulation-in-pulmonary-hypertension
#10
Alberto Pagnamenta, Andrea Azzola, Maurice Beghetti, Frédéric Lador, On Behalf Of The Swiss Society Of Pulmonary Hypertension
The term pulmonary hypertension refers to a serious condition characterised by high pulmonary vascular pressure, mainly as a consequence of various cardiac and respiratory diseases. Current clinical classification of pulmonary hypertension considers five distinct groups. Transthoracic echocardiography represents the first and most important noninvasive screening tool for estimating the probability of pulmonary hypertension. The diagnostic approach to pulmonary hypertension is supported by a proposed algorithm, which identifies the underlying cause...
July 19, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28707117/erratum-to-relaxation-of-the-mcl-after-an-open-wedge-high-tibial-osteotomy-results-in-decreasing-contact-pressures-of-the-knee-over-time
#11
N van Egmond, G Hannink, D Janssen, A C Vrancken, N Verdonschot, A van Kampen
No abstract text is available yet for this article.
July 13, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28706743/when-is-the-optimal-timing-of-surgical-intervention-for-severe-functional-tricuspid-regurgitation
#12
Nobuhiro Nakanishi, Masanobu Ishii, Koichi Kaikita, Ken Okamoto, Yasuhiro Izumiya, Eiichiro Yamamoto, Seiji Takashio, Seiji Hokimoto, Toshihiro Fukui, Kenichi Tsujita
Functional tricuspid regurgitation (TR) is a serious pathology to be noted for severe right heart failure (HF) and poor prognosis; however, the conventional assessment of TR has some limitations and the optimal timing of surgical intervention remains unclear. A 79-year-old Japanese female was admitted to our hospital to undergo cardiac surgery, because edema gradually got worse despite the increase in diuretics. She had a history of atrial fibrillation (AF) and chronic HF due to severe TR and had been treated with a furosemide for leg edema 4 years ago...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28702716/can-the-pulmonary-artery-wedge-pressure-be-used-reliably-as-a-surrogate-for-the-left-atrial-mean-pressure-in-pre-fontan-evaluation
#13
Bassel Mohammad Nijres, Ra-Id Abdulla, Sawsan Awad, Joshua Murphy
The correlation between mean pulmonary artery wedge pressure (PAWP) and left atrial mean pressure (LAMP) has been poorly studied in patients with single ventricle (SV) physiology (Bernstein et al. in Pediatr Cardiol 33: 15-20 2012). The aim of this study is to determine if the PAWP can be used safely as a surrogate to the LAMP to calculate the pulmonary vascular resistance (PVR) during the pre-Fontan evaluation. Also, we aimed to understand if the presence of significant systemic-to-pulmonary collaterals (SPCs) is a confounding factor for accurate estimation of the LAMP...
July 12, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28694355/peripheral-venous-pressure-measurements-in-patients-with-acute-decompensated-heart-failure-pvp-hf
#14
Brett W Sperry, Joseph Campbell, Marat Yanavitski, Samir Kapadia, W H Wilson Tang, Mazen Hanna
BACKGROUND: Accurate assessment of volume status is essential in diagnosis and guidance of decongestive therapy in patients with acute heart failure. We sought to compare peripheral venous pressure (PVP) with central venous pressure (CVP), as well as other invasive hemodynamic measurements, in patients hospitalized with an acute heart failure syndrome. METHODS AND RESULTS: PVP-HF (Peripheral Venous Pressure Measurements in Patients With Acute Decompensated Heart Failure) was a single-center prospective study, which enrolled patients admitted with acute heart failure, regardless of ejection fraction or disease pathogenesis...
July 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28690287/stroke-volume-variation-svv-and-pulse-pressure-variation-ppv-as-indicators-of-fluid-responsiveness-in-sevoflurane-anesthetized-mechanically-ventilated-euvolemic-dogs
#15
Yusuke Endo, Jun Tamura, Tomohito Ishizuka, Takaharu Itami, Kiwamu Hanazono, Kenjiro Miyoshi, Tadashi Sano, Kazuto Yamashita, William W Muir
Changes in stroke volume variation (SVV) and pulse pressure variation (PPV) in response to fluid infusion were experimentally evaluated during vecuronium infusion and sevoflurane anesthesia in 5 adult, mechanically ventilated, euvolemic, beagle dogs. Sequential increases in central venous pressure (CVP; 3-7[baseline], 8-12, 13-17, 18-22 and 23-27 mmHg) were produced by infusing lactated Ringer's solution and 6% hydroxyethyl starch solution. Heart rate (beats/min), right atrial pressure (RAP, mmHg), pulmonary arterial pressure (PAP, mmHg), pulmonary capillary wedge pressure (PCWP, mmHg), transpulmonary thermodilution cardiac output (TPTDCO, L/min), stroke volume (SV, ml/beat), arterial blood pressure (ABP, mmHg), extravascular lung water (EVLW, ml), pulmonary vascular permeability index (PVPI, calculated), SVV (%), PPV (%) and systemic vascular resistance (SVR, dynes/sec/cm(5)) were determined at each predetermined CVP range...
July 10, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28680567/the-safety-and-tolerability-of-inhaled-treprostinil-in-patients-with-pulmonary-hypertension-and-chronic-obstructive-pulmonary-disease
#16
Abubakr A Bajwa, Adil Shujaat, Minal Patel, Colleen Thomas, Franck Rahaghi, Charles D Burger
The primary aim was to explore the safety and tolerability of inhaled treprostinil when used in patients with pulmonary hypertension (PH) with concomitant chronic obstructive pulmonary disease (COPD). Patients with a diagnosis of pre-capillary PH (defined as pulmonary artery mean pressure of ≥ 25 mmHg and pulmonary artery wedge pressure or left ventricular end diastolic pressure of ≤ 15 mmHg) who were being initiated on inhaled treprostinil and had concomitant COPD (defined as FEV1/FVC ratio ≤ 70% with FEV1 ≥ 40% predicted) were considered for inclusion in this pilot study...
March 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28679970/clinical-significance-of-pulmonary-arterial-capacitance-calculated-by-echocardiography-in-patients-with-advanced-heart-failure
#17
Yuki Saito, Tomohito Ohtani, Hidetaka Kioka, Toshinari Onishi, Yasumasa Tsukamoto, Kei Nakamoto, Tatsunori Taniguchi, Satoshi Nakatani, Atsushi Hirayama, Yasushi Sakata
BACKGROUND: Advanced left heart failure (HF) often accompanies post-capillary pulmonary hypertension related to RV afterload. Although pulmonary arterial capacitance (PAC), a measure of pulmonary artery compliance, reflects right ventricular (RV) afterload, the clinical utility of PAC obtained by echocardiography (echo-PAC) is not well established in advanced HF.Methods and Results:We performed right heart catheterization in advanced HF patients (n=30), calculating echo-PAC as stroke volume/(tricuspid regurgitation pressure gradient-pulmonary regurgitation pressure gradient)...
July 4, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28677877/a-phase-2a-dose-escalation-study-of-the-safety-tolerability-pharmacokinetics-and-haemodynamic-effects-of-bms-986231-in-hospitalized-patients-with-heart-failure-with-reduced-ejection-fraction
#18
Cristina Tita, Edward M Gilbert, Adrian B Van Bakel, Jacek Grzybowski, Garrie J Haas, Mohammad Jarrah, Stephanie H Dunlap, Stephen S Gottlieb, Marc Klapholz, Parag C Patel, Roman Pfister, Tim Seidler, Keyur B Shah, Tomasz Zieliński, Robert P Venuti, Douglas Cowart, Shi Yin Foo, Alexander Vishnevsky, Veselin Mitrovic
AIMS: This study was designed to evaluate the safety, tolerability and haemodynamic effects of BMS-986231, a novel second-generation nitroxyl donor with potential inotropic, lusitropic and vasodilatory effects in patients hospitalized with decompensated heart failure and reduced ejection fraction (HFrEF). METHODS AND RESULTS: Forty-six patients hospitalized with decompensated HFrEF were enrolled into four sequential dose-escalation cohorts in this double-blind, randomized, placebo-controlled Phase 2a study...
July 5, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28665826/unrecognized-left-heart-failure-in-lvad-recipients-the-role-of-routine-invasive-hemodynamic-testing
#19
Palak Shah, Nina Badoe, Sheila Phillips, Kamil Abdullah, Christopher W May, Jose L Nabut, Ramesh Singh, Christopher deFilippi, Shashank S Desai
The role of routine right heart catheterizations (RHCs) in left ventricular assist device (LVAD) patients is undefined. We analyzed 105 continuous-flow LVAD recipients who underwent an RHC approximately 3 months after implant. In 38 patients, LVAD speed was ramped with the goal of optimizing hemodynamics. Our cohort consisted of 71 (68%) HeartMate II (HMII) and 34 (32%) HeartWare (HVAD) patients. Thirty patients (29%) had either a reduced cardiac index (CI ≤ 2.2 L/min/m), elevated pulmonary capillary wedge pressure (PCWP > 18 mm Hg), or both...
June 24, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28664601/left-atrial-strain-predicts-hemodynamic-parameters-in-cardiovascular-patients
#20
Bernd Hewing, Lena Theres, Sebastian Spethmann, Karl Stangl, Henryk Dreger, Fabian Knebel
BACKGROUND: We aimed to evaluate the predictive value of left atrial (LA) reservoir, conduit, and contractile function parameters as assessed by speckle tracking echocardiography (STE) for invasively measured hemodynamic parameters in a patient cohort with myocardial and valvular diseases. METHODS: Sixty-nine patients undergoing invasive hemodynamic assessment were enrolled into the study. Invasive hemodynamic parameters were obtained by left and right heart catheterization...
June 29, 2017: Echocardiography
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