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https://www.readbyqxmd.com/read/28067518/agglomeration-of-monomers-and-dimers-contribution-in-precipitation-kinetics-microscopic-approach
#1
Gersh O Berim, Lana I Brim, Eli Ruckenstein
A microscopic theory of precipitation kinetics in solution developed previously by Ruckenstein and co-workers (Dadyburjor, D.B.; Ruckenstein E. {\it J.Cryst.Growth} 1977, {\bf 40}, 279-290; Bhakta, A.; Ruckenstein E. {\it J.Chem.Phys.} 1995, {\bf 103}, 7120-7135.) is generalized. The processes (not considered in the original approach) of monomer-monomer agglomeration leading to creation of dimers as well as absorption (emission) of dimers by solute particles leading to their growth (decay) are included in the theory...
January 9, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28047829/th-ab-201-07-filmless-treatment-localization-qa-for-the-cyberknife-system
#2
J Gersh, M Noll
PURPOSE: Accuray recommends daily evaluation of the treatment localization and delivery systems (TLS/TDS) of the CyberKnife. The vendor-provided solution is a Winston-Lutz-type test that evaluates film shadows from an orthogonal beam pair (known as AQA). Since film-based techniques are inherently inefficient and potentially inconsistent and uncertain, this study explores a method which provides a comparable test with greater efficiency, consistency, and certainty. This test uses the QAStereoChecker (QASC, Standard Imaging, Inc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047803/su-f-t-552-a-one-year-evaluation-of-the-qabeamchecker-for-use-with-the-cyberknife-system
#3
J Gersh
PURPOSE: By attaching an adapter plate with fiducial markers to the QA BeamChecker+ (Standard Imaging, Inc., Middleton, WI), the output of the CyberKnife can be accurately, efficiently, and consistently evaluated. The adapter plate, known as the Cutting Board, allows for automated alignment of the QABC+ using the CK's stereoscopic kV image-based treatment localization system (TLS). Described herein is an evaluation of the system following a year of clinical utilization. METHODS: Based on a CT scan of the QABC+ and CB, a treatment plan is generated which delivers a beam to each of the 5 plane-parallel ionization chambers...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046572/tu-fg-201-09-predicting-accelerator-dysfunction
#4
C Able, C Nguyen, A Baydush, J Gersh, A Ndlovu, I Rebo, J Booth, M Perez, B Sintay, M Munley
PURPOSE: To develop an integrated statistical process control (SPC) framework using digital performance and component data accumulated within the accelerator system that can detect dysfunction prior to unscheduled downtime. METHODS: Seven digital accelerators were monitored for twelve to 18 months. The accelerators were operated in a 'run to failure mode' with the individual institutions determining when service would be initiated. Institutions were required to submit detailed service reports...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28034376/predictors-and-prognostic-implications-of%C3%A2-incident-heart-failure-in-patients-with%C3%A2-prevalent-atrial-fibrillation
#5
Ambarish Pandey, Sunghee Kim, Curtiss Moore, Laine Thomas, Bernard Gersh, Larry A Allen, Peter R Kowey, Kenneth W Mahaffey, Elaine Hylek, Eric D Peterson, Jonathan P Piccini, Gregg C Fonarow
OBJECTIVES: The purpose of this study was to determine the significant clinical predictors of incident heart failure (HF) and its prognostic effect on long-term outcomes among community-based patients with established atrial fibrillation (AF). BACKGROUND: AF is associated with an increased risk of HF. However, in this population, little focus is placed on risk stratification for and the prevention of HF. METHODS: Patients with AF but without HF at baseline enrolled in the ORBIT-AF (Outcomes Registry for Informed Treatment of Atrial Fibrillation) registry were included...
January 2017: JACC. Heart Failure
https://www.readbyqxmd.com/read/28025189/cardiopoietic-cell-therapy-for-advanced-ischemic-heart-failure-results-at-39-weeks-of-the-prospective-randomized-double-blind-sham-controlled-chart-1-clinical-trial
#6
Jozef Bartunek, Andre Terzic, Beth A Davison, Gerasimos S Filippatos, Slavica Radovanovic, Branko Beleslin, Bela Merkely, Piotr Musialek, Wojciech Wojakowski, Peter Andreka, Ivan G Horvath, Amos Katz, Dariouch Dolatabadi, Badih El Nakadi, Aleksandra Arandjelovic, Istvan Edes, Petar M Seferovic, Slobodan Obradovic, Marc Vanderheyden, Nikola Jagic, Ivo Petrov, Shaul Atar, Majdi Halabi, Valeri L Gelev, Michael K Shochat, Jaroslaw D Kasprzak, Ricardo Sanz-Ruiz, Guy R Heyndrickx, Noémi Nyolczas, Victor Legrand, Antoine Guédès, Alex Heyse, Tiziano Moccetti, Francisco Fernandez-Aviles, Pilar Jimenez-Quevedo, Antoni Bayes-Genis, Jose Maria Hernandez-Garcia, Flavio Ribichini, Marcin Gruchala, Scott A Waldman, John R Teerlink, Bernard J Gersh, Thomas J Povsic, Timothy D Henry, Marco Metra, Roger J Hajjar, Michal Tendera, Atta Behfar, Bertrand Alexandre, Aymeric Seron, Wendy Gattis Stough, Warren Sherman, Gad Cotter, William Wijns
AIMS: Cardiopoietic cells, produced through cardiogenic conditioning of patients' mesenchymal stem cells, have shown preliminary efficacy. The Congestive Heart Failure Cardiopoietic Regenerative Therapy (CHART-1) trial aimed to validate cardiopoiesis-based biotherapy in a larger heart failure cohort. METHODS AND RESULTS: This multinational, randomized, double-blind, sham-controlled study was conducted in 39 hospitals. Patients with symptomatic ischemic heart failure on guideline-directed therapy (n = 484) were screened; n = 348 underwent bone marrow harvest and mesenchymal stem cell expansion...
December 23, 2016: European Heart Journal
https://www.readbyqxmd.com/read/28017349/predictors-and-prognostic-implications-of-incident-heart-failure-in-patients-with-prevalent-atrial-fibrillation
#7
Ambarish Pandey, Sunghee Kim, Curtiss Moore, Laine Thomas, Bernard Gersh, Larry A Allen, Peter R Kowey, Kenneth W Mahaffey, Elaine Hylek, Eric D Peterson, Jonathan P Piccini, Gregg C Fonarow
OBJECTIVES: The purpose of this study was to determine the significant clinical predictors of incident heart failure (HF) and its prognostic effect on long-term outcomes among community-based patients with established atrial fibrillation (AF). BACKGROUND: AF is associated with an increased risk of HF. However, in this population, little focus is placed on risk stratification for and the prevention of HF. METHODS: Patients with AF but without HF at baseline enrolled in the ORBIT-AF (Outcomes Registry for Informed Treatment of Atrial Fibrillation) registry were included...
November 30, 2016: JACC. Heart Failure
https://www.readbyqxmd.com/read/28011796/cardiac-resynchronization-therapy-in-patients-with-end-stage-hypertrophic-cardiomyopathy
#8
Ammar M Killu, Jae-Yoon Park, Jaskanwal D Sara, David O Hodge, Bernard J Gersh, Rick A Nishimura, Samuel J Asirvatham, Christopher J McLeod
AIMS: A dilated/end-stage phase of hypertrophic cardiomyopathy (HCM) is rare but well-recognized. The role for cardiac resynchronization therapy (CRT) in this subset of patients remains unexplored. We aimed to clarify the impact of bi-ventricular pacing CRT in dilated/end-stage HCM. METHODS AND RESULTS: The Mayo Clinic HCM database was interrogated to identify patients with ejection fraction (EF) <50% and CRT. Control subjects were identified in 1:1 manner...
December 23, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28002833/quality-of-evidence-underlying-the-american-heart-association-american-college-of-cardiology-heart-rhythm-society-guidelines-on-the-management-of-atrial-fibrillation
#9
Adam S Barnett, William R Lewis, Michael E Field, Gregg C Fonarow, Bernard J Gersh, Richard L Page, Hugh Calkins, Benjamin A Steinberg, Eric D Peterson, Jonathan P Piccini
Importance: The joint American College of Cardiology (ACC), American Heart Association (AHA), and Heart Rhythm Society (HRS) guidelines on the management of atrial fibrillation (AF) are used extensively to guide patient care. Objective: To describe the evidence base and changes over time in the AHA/ACC/HRS guidelines on AF with respect to the distribution of recommendations across classes of recommendations and levels of evidence. Data Sources: Data from the AHA/ACC/HRS guidelines on AF from 2001, 2006, 2011, and 2014 were abstracted...
December 14, 2016: JAMA Cardiology
https://www.readbyqxmd.com/read/27978942/off-label-dosing-of-non-vitamin-k-antagonist-oral-anticoagulants-and-adverse-outcomes-the-orbit-af-ii-registry
#10
Benjamin A Steinberg, Peter Shrader, Laine Thomas, Jack Ansell, Gregg C Fonarow, Bernard J Gersh, Peter R Kowey, Kenneth W Mahaffey, Gerald Naccarelli, James Reiffel, Daniel E Singer, Eric D Peterson, Jonathan P Piccini
BACKGROUND: Although non-vitamin K antagonist oral anticoagulants (NOACs) do not require frequent laboratory monitoring, each compound requires dose adjustments on the basis of certain clinical criteria. OBJECTIVES: This study assessed the frequency of off-label NOAC doses among AF patients and the associations between off-label dose therapy and clinical outcomes in community practice. METHODS: We evaluated 5,738 patients treated with a NOAC at 242 ORBIT-AF II (Outcomes Registry for Better Informed Treatment of Atrial Fibrillation phase II) sites...
December 20, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27914493/patient-factors-associated-with-quality-of-life-in-atrial-fibrillation
#11
Tiffany C Randolph, DaJuanicia N Simon, Laine Thomas, Larry A Allen, Gregg C Fonarow, Bernard J Gersh, Peter R Kowey, James A Reiffel, Gerald V Naccarelli, Paul S Chan, John A Spertus, Eric D Peterson, Jonathan P Piccini
BACKGROUND: As treatment options for atrial fibrillation (AF) increase, more attention is focused on patients' experiences and quality of life (QoL). However, little is known about the factors associated with these outcomes. METHODS: The Atrial Fibrillation Effect on QualiTy-of-life (AFEQT) is a disease-specific QoL tool for AF, with domain and summary scores ranging from 0 (the worst QoL) to 100. Using multivariable linear regression, we evaluated factors associated with baseline AFEQT Summary and Subscale Scores in ORBIT AF, a large, community-based AF registry...
December 2016: American Heart Journal
https://www.readbyqxmd.com/read/27903589/impact-of-left-atrial-appendage-closure-during-cardiac-surgery-on-the-occurrence-of-early-postoperative-atrial-fibrillation-stroke-and-mortality-a-propensity-score-matched-analysis-of-10-633-patients
#12
Rowlens M Melduni, Hartzell V Schaff, Hon-Chi Lee, Bernard J Gersh, Peter A Noseworthy, Kent R Bailey, Naser M Ammash, Stephen S Cha, Kaniz Fatema, Waldemar E Wysokinski, James B Seward, Douglas L Packer, Charanjit S Rihal, Samuel J Asirvatham
BACKGROUND: -Prophylactic exclusion of the left atrial appendage (LAA) is often performed during cardiac surgery ostensibly to reduce the risk of stroke. However, the clinical impact of LAA closure in humans remains inconclusive. METHODS: -Out of 10,633 adults who underwent CABG and/or valve surgery between January 2000 and December 2005, 9,792 patients with complete baseline characteristics, surgery procedure and follow-up data were included in this analysis. A propensity-score matching analysis based on 28 pretreatment covariates was performed and 461 matching pairs were derived and analyzed to estimate the association of LAA closure with early postoperative atrial fibrillation (POAF) (AF ≤30 days of surgery), ischemic stroke and mortality...
November 30, 2016: Circulation
https://www.readbyqxmd.com/read/27888051/absence-of-oral-anticoagulation-and-subsequent-outcomes-among-outpatients-with-atrial-fibrillation
#13
Paul L Hess, Sunghee Kim, Gregg C Fonarow, Laine Thomas, Daniel E Singer, James V Freeman, Bernard J Gersh, Jack Ansell, Peter R Kowey, Kenneth W Mahaffey, Paul S Chan, Benjamin A Steinberg, Eric D Peterson, Jonathan P Piccini
BACKGROUND: Prior studies have shown a treatment gap in oral anticoagulation (OAC) use among patients with atrial fibrillation yet have incompletely characterized factors associated with failure to treat and subsequent outcomes in contemporary practice. METHODS: Using data collected between June 2010 and August 2011 from 174 ambulatory care sites in the Outcomes Registry for Better Informed Treatment of Atrial Fibrillation, we identified factors associated with absence of OAC via stratified logistic regression...
November 22, 2016: American Journal of Medicine
https://www.readbyqxmd.com/read/27884252/differentiation-of-constriction-and-restriction-complex-cardiovascular-hemodynamics
#14
REVIEW
Jeffrey B Geske, Nandan S Anavekar, Rick A Nishimura, Jae K Oh, Bernard J Gersh
Differentiation of constrictive pericarditis (CP) from restrictive cardiomyopathy (RCM) is a complex and often challenging process. Because CP is a potentially curable cause of heart failure and therapeutic options for RCM are limited, distinction of these 2 conditions is critical. Although different in regard to etiology, prognosis, and treatment, CP and RCM share a common clinical presentation of predominantly right-sided heart failure, in the absence of significant left ventricular systolic dysfunction or valve disease, due to impaired ventricular diastolic filling...
November 29, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27883166/effect-of-low-dose-rapamycin-on-senescence-markers-and-physical-functioning-in-older-adults-with-coronary-artery-disease-results-of-a-pilot-study
#15
M Singh, M D Jensen, A Lerman, S Kushwaha, C S Rihal, B J Gersh, A Behfar, T Tchkonia, R J Thomas, R J Lennon, L R Keenan, A G Moore, J L Kirkland
Rapamycin, an mTOR inhibitor affects senescence through suppression of senescence-associated secretory phenotype (SASP). We studied the safety and feasibility of low-dose rapamycin and its effect on SASP and frailty in elderly undergoing cardiac rehabilitation (CR). 13 patients; 6 (0.5mg), 6 (1.0mg), and 1 patient received 2mg oral rapamycin (serum rapamycin <6ng/ml) daily for 12 weeks. Median age was 73.9±7.5 years and 12 were men. Serum interleukin-6 decreased (2.6 vs 4.4 pg/ml) and MMP-3 (26 vs 23.5 ng/ml) increased...
2016: Journal of Frailty & Aging
https://www.readbyqxmd.com/read/27873763/pericardiectomy-as-a-diagnostic-and-therapeutic-procedure
#16
Ewa Konik, Jeffrey Geske, William Edwards, Bernard Gersh
A 70-year-old man presented with recent onset, predominantly right-sided heart failure. Echocardiogram demonstrated features of hypertensive heart disease and was suggestive of, but non-diagnostic for, constrictive pericarditis (CP). CT demonstrated mild pericardial thickening. Right heart catheterisation showed elevation and equalisation of diastolic pressures in all cardiac chambers with early rapid filling, minimal ventricular interdependence, and no dissociation of intrathoracic and intracardiac pressures...
November 14, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27873428/data-and-safety-monitoring-board-evaluation-and-management-of-a-renal-adverse-event-signal-in-topcat
#17
REVIEW
Michael R Bristow, Kavita Sharma, Susan F Assmann, Stuart Linas, Bernard J Gersh, Christine Grady, Madeline Murguia Rice, Steven Singh, Robin Boineau, Sonja M McKinlay, Barry H Greenberg
Clinical trial Data and Safety Monitoring Boards (DSMBs) have a primary obligation of ensuring study participant safety, while maintaining trial integrity. The role of DSMBs is expanding, and ideally should include post-hoc reporting of deliberative processes related to clinically important safety issues or factors that could impact on future trial designs. We describe how the TOPCAT DSMB detected, investigated, and adjudicated an unexpectedly large renal adverse event signal midway through the trial, and offer general guidelines for dealing with similar unanticipated occurrences in future trials...
November 21, 2016: European Journal of Heart Failure
https://www.readbyqxmd.com/read/27836132/gender-differences-in-associations-between-intraprocedural-thrombotic-events-during-percutaneous-coronary-intervention-and-adverse-outcomes
#18
Mikkel M Schoos, Roxana Mehran, George D Dangas, Jennifer Yu, Usman Baber, Peter Clemmensen, Frederick Feit, Bernard J Gersh, Giulio Guagliumi, E Magnus Ohman, Stuart J Pocock, Bernhard Witzenbichler, Gregg W Stone
Women are frequently reported to have increased morbidity after presentation with acute coronary syndromes and myocardial infarction; however, whether a greater thrombotic tendency contributes to gender differences in clinical outcomes of urgent percutaneous coronary intervention is unknown. Intraprocedural Thrombotic Events (IPTEs) are defined as new or increasing thrombus, abrupt vessel closure, no reflow or slow reflow, or distal embolization at any time during percutaneous coronary intervention. IPTEs were evaluated in this pooled analysis of 6,591 patients with stent implantation and blinded quantitative coronary angiography (QCA) analysis, from the ACUITY and HORIZONS-AMI trials...
October 11, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/27823686/how-well-does-physician-risk-assessment-predict-stroke-and-bleeding-in-atrial-fibrillation-results-from-the-outcomes-registry-for-better-informed-treatment-of-atrial-fibrillation-orbit-af
#19
Benjamin A Steinberg, Peter Shrader, Sunghee Kim, Laine Thomas, Gregg C Fonarow, Jack Ansell, Peter R Kowey, Daniel E Singer, Bernard J Gersh, Kenneth W Mahaffey, Eric D Peterson, Jonathan P Piccini
BACKGROUND: Assessments of stroke and bleeding risks are essential to selecting oral anticoagulation in patients with atrial fibrillation (AF). We aimed to assess outcomes according to physician assessed risk, with comparison to empirical risk scores. METHODS: This was a prospective, observational study of 9,715 outpatients with AF enrolled in ORBIT-AF, a US national registry. Stroke and bleeding risks were quantified by physician assignment, CHADS2 and CHA2DS2-VASc stroke scores, and ATRIA and HAS-BLED bleeding scores...
November 2016: American Heart Journal
https://www.readbyqxmd.com/read/27788856/regression-to-the-mean-in-symplicity%C3%A2-htn-3-implications-for-design-and-reporting-of-future-trials
#20
REVIEW
Stuart J Pocock, George Bakris, Deepak L Bhatt, Sandeep Brar, Martin Fahy, Bernard J Gersh
Regression to the mean (RTM) describes the tendency for an extreme measurement on 1 occasion to become less extreme when measured again. RTM may affect clinical trial data interpretation when the outcome measure has high variability. We investigated RTM in the SYMPLICITY HTN-3 (Renal Denervation in Patients With Uncontrolled Hypertension) trial of renal denervation versus a sham procedure. Analysis of covariance was performed on the 6-month change in systolic blood pressure, estimating a mean treatment difference of -4...
November 1, 2016: Journal of the American College of Cardiology
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