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https://www.readbyqxmd.com/read/28221379/bridgehead-isomer-effects-in-bis-phosphido-bridged-diiron-hexacarbonyl-proton-reduction-electrocatalysts
#1
Ahibur Rahaman, Carolina Gimbert-Suriñach, Arne Ficks, Graham E Ball, Mohan Bhadbhade, Matti Haukka, Lee Higham, Ebbe Nordlander, Stephen B Colbran
The influence of the substitution, orientation and structure of the phosphido bridges in [Fe2(CO)6(μ-PR2)2] electrocatalysts of proton reduction has been studied. The isomers e,a-[Fe2(CO)6{μ-P(Ar)H}2] (1a(Ar): Ar = Ph, 2'-methoxy-1,1'-binaphthyl (bn')), e,e-[Fe2(CO)6{μ-P(Ar)H}2] (1b(Ar): Ar = Ph, bn') were isolated from reactions of iron pentacarbonyl and the corresponding primary phosphine, syntheses that also afforded the phosphinidene-capped tri-iron clusters, [Fe3(CO)9(μ-CO)(μ3-Pbn')] (2) and [Fe3(CO)9(μ3-PAr)2] (3(Ar), Ar = Ph, bn')...
February 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28209349/frequency-of-and-significance-of-physical-frailty-in-patients-with-heart-failure
#2
Quin E Denfeld, Kerri Winters-Stone, James O Mudd, Shirin O Hiatt, Christopher V Chien, Christopher S Lee
Physical frailty is an important prognostic indicator in heart failure (HF); however, few studies have examined the relation between physical frailty and invasive hemodynamics among adults with HF. The purpose of this study was to characterize physical frailty in HF in relation to invasive hemodynamics. We enrolled 49 patients with New York Heart Association class II to IV HF when participants were scheduled for a right-sided cardiac heart catheterization procedure. Physical frailty was measured according to the "frailty phenotype": shrinking, weakness, slowness, physical exhaustion, and low physical activity...
January 25, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28207478/-zero-preventable-deaths-and-minimizing-disability-the-challenge-set-forth-by-the-national-academies-of-sciences-engineering-and-medicine
#3
Daniel J Stinner, Anthony E Johnson, Andrew Pollak, Ellen MacKenzie, James R Ficke, Robert L Mabry, James Czarnik, Andrew Schmidt
No abstract text is available yet for this article.
February 15, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28203124/when-diarrhea-can-become-deadly-legionnaires-disease-complicated-by-bowel-obstruction
#4
Wesley Prichard, Laurel Fick
Legionnaires' disease may present with a broad spectrum of illnesses and nonspecific extrapulmonary symptoms including diarrhea. To our knowledge, bowel obstruction has not been reported as a manifestation of Legionella. We present a unique case of Legionnaires' disease contributing to a small bowel obstruction.
September 2016: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/28191357/metastatic-invasive-lobular-breast-cancer-presenting-clinically-with-esophageal-dysphagia
#5
Lilit Karapetyan, Heather Laird-Fick, Reuben Cuison
Background. Intra-abdominal metastases of invasive lobular breast cancer (ILBC) may be insidious. We report a case of metastatic ILBC that presented with dysphagia within weeks of a negative mammogram and before the development of intra-abdominal symptoms. Case. A 70-year-old female developed esophageal dysphagia. She underwent EGD which showed a short segment of stricture of the distal esophagus without significant mucosal changes. Biopsy was unremarkable and patient underwent lower esophageal sphincter (LES) dilation...
2017: Case Reports in Oncological Medicine
https://www.readbyqxmd.com/read/28187374/the-strengths-and-weaknesses-of-non-invasive-parameters-obtained-by-echocardiography-and-cardiopulmonary-exercise-testing-in-comparison-with-the-hemodynamic-assessment-by-the-right-heart-catheterization-in-patients-with-pulmonary-hypertension
#6
Katarzyna Ptaszyńska-Kopczyńska, Anna Krentowska, Emilia Sawicka, Anna Skoneczny, Małgorzata Jasiewicz, Małgorzata Knapp, Włodzimierz J Musiał, Bożena Sobkowicz, Karol A Kamiński
PURPOSE: Pulmonary hypertension (PH) diagnosis requires invasive assessment by right heart catheterization (RHC), but screening and monitoring are performed using non-invasive methods: echocardiography and cardiopulmonary exercise testing (CPET). The aim of the study was to assess correlations between the parameters obtained in non-invasive testing and RHC in patients with PH of different etiologies. MATERIAL/METHODS: The study included 53 medical records of PH patients (32 women) aged 29-81 years...
June 14, 2016: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28185701/immediate-increase-of-cardiac-output-after-percutaneous-mitral-valve-repair-pmvr-determined-by-echocardiographic-and-invasive-parameters-patzelt-increase-of-cardiac-output-after-pmvr
#7
Johannes Patzelt, Yingying Zhang, Harry Magunia, Rezo Jorbenadze, Michal Droppa, Miriam Ulrich, Shanglang Cai, Henning Lausberg, Tobias Walker, Tobias Wengenmayer, Peter Rosenberger, Juergen Schreieck, Peter Seizer, Meinrad Gawaz, Harald F Langer
BACKGROUND: Successful percutaneous mitral valve repair (PMVR) in patients with severe mitral regurgitation (MR) causes changes in hemodynamics. Echocardiographic calculation of cardiac output (CO) has not been evaluated in the setting of PMVR, so far. Here we evaluated hemodynamics before and after PMVR with the MitraClip system using pulmonary artery catheterization, transthoracic (TTE) and transesophageal (TEE) echocardiography. METHODS: 101 patients with severe MR not eligible for conventional surgery underwent PMVR...
January 26, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28178841/diffusion-dominated-evaporation-in-multicomponent-lattice-boltzmann-simulations
#8
Dennis Hessling, Qingguang Xie, Jens Harting
We present a diffusion dominated evaporation model using the popular pseudopotential multicomponent lattice Boltzmann method introduced by Shan and Chen. With an analytical computation of the diffusion coefficients, we demonstrate that Fick's law is obeyed. We then validate the applicability of our model by demonstrating the agreement of the time evolution of the interface position of an evaporating planar film to the analytical prediction. Furthermore, we study the evaporation of a freely floating droplet and confirm that the effect of Laplace pressure is significant for predicting the time evolution of small droplet radii...
February 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28174344/glucagon-like-peptide-1-elicits-vasodilation-in-adipose-tissue-and-skeletal-muscle-in-healthy-men
#9
Ali Asmar, Meena Asmar, Lene Simonsen, Sten Madsbad, Jens J Holst, Bolette Hartmann, Charlotte M Sorensen, Jens Bülow
In healthy subjects, we recently demonstrated that during acute administration of GLP-1, cardiac output increased significantly, whereas renal blood flow remained constant. We therefore hypothesize that GLP-1 induces vasodilation in other organs, for example, adipose tissue, skeletal muscle, and/or splanchnic tissues. Nine healthy men were examined twice in random order during a 2-hour infusion of either GLP-1 (1.5 pmol kg(-1) min(-1)) or saline. Cardiac output was continuously estimated noninvasively concomitantly with measurement of intra-arterial blood pressure...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28165803/tanshinol-sustained-release-pellets-with-absorption-enhancer-optimization-characterization-pharmacokinetics-and-pharmacodynamics
#10
Panpan Yu, Shuangshuang Zhang, Wenli Zhang, Jikun Yang, Jing Lu, Jianping Liu
The objective of this study was to develop tanshinol sustained-release pellets (TS-SRPs) for the treatment of angina. Considering the poor intestinal absorption of TS, sodium caprate (SC) was used as an absorption enhancer for bioavailability improvement. Single-pass intestinal perfusion in rats demonstrated that the permeability of TS was remarkably enhanced, when the weight ratio of TS to SC was 1:3. Then, the cores were prepared with TS, SC and MCC at a weight ratio of 1:3:16 via extrusion-spheronization, followed by coating with Eudragit® RS30D/RL30D dispersion (9:1, w/w)...
February 6, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28163837/simultaneous-ramp-right-heart-catheterization-and-echocardiography-in-a-reliantheart-left-ventricular-assist-device
#11
Dipanjan Banerjee, Debleena Dutt, Sebastien Duclos, Karim Sallam, Matthew Wheeler, Richard Ha
Many clinicians caring for patients with continuous flow left ventricular assist devices (CF-LVAD) use ramp right heart catheterization (RHC) studies to optimize pump speed and also to troubleshoot CF-LVAD malfunction. An investigational device, the ReliantHeart Heart Assist 5 (Houston, TX), provides the added benefit of an ultrasonic flow probe on the outflow graft that directly measures flow through the CF-LVAD. We performed a simultaneous ramp RHC and echocardiogram on a patient who received the above CF-LVAD to optimize pump parameters and investigate elevated flow through the CF-LVAD as measured by the flow probe...
January 26, 2017: World Journal of Cardiology
https://www.readbyqxmd.com/read/28153941/decreases-in-maximal-oxygen-uptake-following-long-duration-spaceflight-role-of-convective-and-diffusive-o2-transport-mechanisms
#12
Carl J Ade, Ryan M Broxterman, Alan Moore, Thomas J Barstow
We have previously predicted that the decrease in maximal oxygen uptake (VO2max) that accompanies time in microgravity reflects decrements in both convective and diffusive O2 transport to the mitochondria of the contracting myocytes. The aim of this investigation was therefore to quantify the relative changes in convective O2 transport (QO2) and O2 diffusing capacity (DO2) following long duration spaceflight. In 9 astronauts, resting hemoglobin concentration ([Hb]), VO2max, maximal cardiac output (QTmax), and differences in arterial and venous O2 contents (CaO2-CvO2) were obtained retrospectively for International Space Station Increments 19 through 33 (April 2009-November 2012)...
February 2, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28139006/comparison-of-protocols-measuring-diffusion-and-partition-coefficients-in-the-stratum-corneum
#13
H Rothe, C Obringer, J Manwaring, C Avci, W Wargniez, J Eilstein, N Hewitt, R Cubberley, H Duplan, D Lange, C Jacques-Jamin, M Klaric, A Schepky, S Grégoire
Partition (K) and diffusion (D) coefficients are important to measure for the modelling of skin penetration of chemicals through the stratum corneum (SC). We compared the feasibility of three protocols for the testing of 50 chemicals in our main studies, using three cosmetics-relevant model chemicals with a wide range of logP values. Protocol 1: SC concentration-depth profile using tape-stripping (measures KSC/v and DSC /HSC(2) , where HSC is the SC thickness); Protocol 2A: incubation of isolated SC with chemical (direct measurement of KSC/v only) and Protocol 2B: diffusion through isolated SC mounted on a Franz cell (measures KSC/v and DSC /HSC(2) , and is based on Fick's laws)...
January 31, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28125464/cardiac-output-assessment-in-patients-supported-with-left-ventricular-assist-device-discordance-between-thermodilution-and-indirect-fick-cardiac-output-measurements
#14
David M Tehrani, Jonathan Grinstein, Sara Kalantari, Gene Kim, Nitasha Sarswat, Sirtaz Adatya, Gabriel Sayer, Nir Uriel
Cardiac output (CO) assessed by thermodilution (TD) and indirect Fick (iFK) methods is commonly employed in Left Ventricular Assist Devices (LVAD) patients, however no study has assessed agreement. This study assess correlation between these methods, and association with hemodynamic/echocardiographic data in LVAD patients. Discordance was defined as a 20% difference between TD and iFK CO measurements. Bias and agreement were determined via the Bland-Altman technique in both the overall sample and iFK stratified tertiles...
January 23, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28124615/formulation-of-saudi-propolis-into-biodegradable-chitosan-chips-for-vital-pulpotomy
#15
Gihan F Balata, Mohamed I S Abdelhady, Ghada M Mahmoud, Moustafa A Matar, Amani N Abd El-Latif
BACKGROUND: Propolis has been widely used to treat oral cavity disorders, such as endodontal and periodontal diseases and microbial infections. OBJECTIVE: The study aimed at formulation of commercial Saudi propolis into biodegradable chitosan chips and evaluation of its effectiveness as a pulpotomy agent. METHOD: The composition of 80% ethanolic propolis extract was evaluated regarding its total phenolic content, total flavonoid content and antioxidant activity...
January 25, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/28121730/radon-release-and-its-simulated-effect-on-radiation-doses
#16
Momen Orabi
One of the main factors that affect the uncertainty in calculating the gamma-radiation absorbed dose rate inside a room is the variation in the degree of secular equilibrium of the considered radioactive series. A component of this factor, considered in this paper, is the release of radon (Rn) from building materials to the living space of the room. This release takes place through different steps. These steps are represented and mathematically formulated. The diffusion of radon inside the material is described by Fick's second law...
March 2017: Health Physics
https://www.readbyqxmd.com/read/28106652/prospective-outcomes-of-a-pelvic-floor-rehabilitation-program-including-vaginal-electrogalvanic-stimulation-for-urinary-defecatory-and-pelvic-pain-symptoms
#17
Jennifer J Schmitt, Ruchira Singh, Amy L Weaver, Kristin C Mara, Randina R Harvey-Springer, Felecia R Fick, John A Occhino
OBJECTIVES: This study evaluated our experience after implementing a pelvic floor rehabilitation program including behavioral modification, biofeedback, and vaginal electrogalvanic stimulation (EGS). METHODS: This prospective cohort study evaluated outcomes of patients with pelvic floor dysfunction (urinary or defecatory dysfunction, pelvic pain/dyspareunia) who underwent pelvic floor rehabilitation. Patients received 4 to 7 sessions (1 every 2 weeks) including biofeedback and concluded with 30 minutes of vaginal EGS...
January 18, 2017: Female Pelvic Medicine & Reconstructive Surgery
https://www.readbyqxmd.com/read/28104373/novel-multilayer-microcapsules-based-on-soy-protein-isolate-fibrils-and-high-methoxyl-pectin-production-characterization-and-release-modeling
#18
Elham Ansarifar, Mohebbat Mohebbi, Fakhri Shahidi, Arash Koocheki, Navid Ramezanian
In this study, novel microcapsules were produced through the layer by layer adsorption of food-grade and plant-based polyelectrolytes, soy protein isolate (SPI) fibrils and high methoxyl pectin (HMP). The physical properties of the fibrils were investigated by TEM and AFM and the properties of the microcapsules such as size, uniformity, zeta potential, morphology, functional groups, modeling and the release kinetics of limonene were examined. The results revealed that SPI-fibrils had a thickness varying from 1 to 10nm and strand like structure...
April 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28102869/design-considerations-to-minimize-the-impact-of-drug-absorption-in-polymer-based-organ-on-a-chip-platforms
#19
V S Shirure, S C George
Biocompatible polymers, such as polydimethylsiloxane (PDMS), are the materials of choice for creating organ-on-a-chip microfluidic platforms. Desirable qualities include ease of fabrication, optical clarity, and hydrophobicity, the latter of which facilitates oxygen transport to encased cells. An emerging and important application of organ-on-a-chip technology is drug discovery; however, a potential issue for polymer-based microfluidic devices has been highlighted by recent studies with PDMS, which have demonstrated absorption (and thus loss) of hydrophobic drugs into PDMS under certain experimental conditions...
January 19, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28087683/percutaneous-patent-ductus-arteriosus-pda-closure-during-infancy-a-meta-analysis
#20
REVIEW
Carl H Backes, Brian K Rivera, Jeffrey A Bridge, Aimee K Armstrong, Brian A Boe, Darren P Berman, Tyler Fick, Ralf J Holzer, Ziyad M Hijazi, Sylvia Abadir, Henri Justino, Lisa Bergersen, Charles V Smith, Haresh Kirpalani
CONTEXT: Patent ductus arteriosus (PDA) is a precursor to morbidity and mortality. Percutaneous (catheter-based) closure is the procedure of choice for adults and older children with a PDA, but use during infancy (<1 year) is not well characterized. OBJECTIVE: Investigate the technical success and safety of percutaneous PDA closure during infancy. DATA SOURCES: Scopus, Web of Science, Embase, PubMed, and Ovid (Medline) were searched through December 2015 with no language restrictions...
January 13, 2017: Pediatrics
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