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Robert Siegel

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https://www.readbyqxmd.com/read/28274956/natriuretic-peptides-in-the-evaluation-and-management-of-degenerative-mitral-regurgitation-a-systematic-review
#1
REVIEW
Michael M Johl, Pankaj Malhotra, Devin W Kehl, Florian Rader, Robert J Siegel
Progression of degenerative mitral regurgitation (MR) leads to irreversible cardiac damage. Therefore, longitudinal follow up to determine the optimal timing of surgery is critical. Current data indicates that in addition to the standard of care-assessing for symptoms and signs of left ventricular (LV) decompensation with routine echocardiography-serial measurement of natriuretic peptides offers a quantitative means to identify patients who may benefit from closer supervision, if not surgery. Natriuretic peptide levels, and specifically changes from baseline, identify both symptomatic patients and others likely to develop cardiac dysfunction...
March 8, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28262699/gs-5734-and-its-parent-nucleoside-analog-inhibit-filo-pneumo-and-paramyxoviruses
#2
Michael K Lo, Robert Jordan, Aaron Arvey, Jawahar Sudhamsu, Punya Shrivastava-Ranjan, Anne L Hotard, Mike Flint, Laura K McMullan, Dustin Siegel, Michael O Clarke, Richard L Mackman, Hon C Hui, Michel Perron, Adrian S Ray, Tomas Cihlar, Stuart T Nichol, Christina F Spiropoulou
GS-5734 is a monophosphate prodrug of an adenosine nucleoside analog that showed therapeutic efficacy in a non-human primate model of Ebola virus infection. It has been administered under compassionate use to two Ebola patients, both of whom survived, and is currently in Phase 2 clinical development for treatment of Ebola virus disease. Here we report the antiviral activities of GS-5734 and the parent nucleoside analog across multiple virus families, providing evidence to support new indications for this compound against human viruses of significant public health concern...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28249035/inactivity-sleep-in-two-wild-free-roaming-african-elephant-matriarchs-does-large-body-size-make-elephants-the-shortest-mammalian-sleepers
#3
Nadine Gravett, Adhil Bhagwandin, Robert Sutcliffe, Kelly Landen, Michael J Chase, Oleg I Lyamin, Jerome M Siegel, Paul R Manger
The current study provides details of sleep (or inactivity) in two wild, free-roaming African elephant matriarchs studied in their natural habitat with remote monitoring using an actiwatch subcutaneously implanted in the trunk, a standard elephant collar equipped with a GPS system and gyroscope, and a portable weather station. We found that these two elephants were polyphasic sleepers, had an average daily total sleep time of 2 h, mostly between 02:00 and 06:00, and displayed the shortest daily sleep time of any mammal recorded to date...
2017: PloS One
https://www.readbyqxmd.com/read/28246640/ultraflexible-nanoelectronic-probes-form-reliable-glial-scar-free-neural-integration
#4
Lan Luan, Xiaoling Wei, Zhengtuo Zhao, Jennifer J Siegel, Ojas Potnis, Catherine A Tuppen, Shengqing Lin, Shams Kazmi, Robert A Fowler, Stewart Holloway, Andrew K Dunn, Raymond A Chitwood, Chong Xie
Implanted brain electrodes construct the only means to electrically interface with individual neurons in vivo, but their recording efficacy and biocompatibility pose limitations on scientific and clinical applications. We showed that nanoelectronic thread (NET) electrodes with subcellular dimensions, ultraflexibility, and cellular surgical footprints form reliable, glial scar-free neural integration. We demonstrated that NET electrodes reliably detected and tracked individual units for months; their impedance, noise level, single-unit recording yield, and the signal amplitude remained stable during long-term implantation...
February 2017: Science Advances
https://www.readbyqxmd.com/read/28218385/timing-of-completion-lymphadenectomy-after-positive-sentinel-node-biopsy-in-patients-with-melanoma
#5
C M C Oude Ophuis, A C J van Akkooi, P Rutkowski, W E M Powell, C Robert, A Testori, B L van Leeuwen, P Siegel, A M M Eggermont, C Verhoef, D J Grünhagen
BACKGROUND: Nodal staging with sentinel node biopsy (SNB) and completion lymph node dissection (CLND) provides prognostic information to patients with melanoma and their physicians. It is not known whether the timing of CLND is associated with survival outcome and/or CLND tumour load. This study investigated whether CLND timing is associated with CLND tumour load, disease-free survival (DFS) and/or melanoma-specific survival (MSS). METHODS: A retrospective cohort of patients with SNB-positive melanoma from nine European Organisation for Research and Treatment of Cancer (EORTC) Melanoma Group centres undergoing surgery between 1993 and 2009 were examined...
February 20, 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28188186/nccn-guidelines-insights-bone-cancer-version-2-2017
#6
J Sybil Biermann, Warren Chow, Damon R Reed, David Lucas, Douglas R Adkins, Mark Agulnik, Robert S Benjamin, Brian Brigman, G Thomas Budd, William T Curry, Aarati Didwania, Nicola Fabbri, Francis J Hornicek, Joseph B Kuechle, Dieter Lindskog, Joel Mayerson, Sean V McGarry, Lynn Million, Carol D Morris, Sujana Movva, Richard J O'Donnell, R Lor Randall, Peter Rose, Victor M Santana, Robert L Satcher, Herbert Schwartz, Herrick J Siegel, Katherine Thornton, Victor Villalobos, Mary Anne Bergman, Jillian L Scavone
The NCCN Guidelines for Bone Cancer provide interdisciplinary recommendations for treating chordoma, chondrosarcoma, giant cell tumor of bone, Ewing sarcoma, and osteosarcoma. These NCCN Guidelines Insights summarize the NCCN Bone Cancer Panel's guideline recommendations for treating Ewing sarcoma. The data underlying these treatment recommendations are also discussed.
February 2017: Journal of the National Comprehensive Cancer Network: JNCCN
https://www.readbyqxmd.com/read/28175012/p241-defining-patient-centered-outcomes-for-ibd-an%C3%A2-international-cross-disciplinary-consensus
#7
A Kim, C Roberts, B Feagan, R Banerjee, W Bemelman, K Bodger, M Derieppe, A Dignass, R Driscoll, R Fitzpatrick, P Higgins, P Kotze, J Meissner, M O'Connor, Z-H Ran, C Siegel, H Terry, W van Deen, C van der Woude, A Weaver, S-K Yang, B Sands, S Vermeire, S Travis
No abstract text is available yet for this article.
February 1, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28170312/problem-video-gaming-among-children-enrolled-in-tertiary-weight-management-programs
#8
Sam Stubblefield, George Datto, Thao-Ly T Phan, Lloyd N Werk, Kristin Stackpole, Robert Siegel, William Stratbucker, Jared M Tucker, Amy L Christison, Jobayer Hossain, Douglas A Gentile
Prior studies show seven percent to nine percent of children demonstrate gaming behaviors that affect a child's ability to function (e.g., problem gaming), but none have examined the association between problem gaming and weight status. The objective of this study was to determine the prevalence of problem gaming among children enrolled in tertiary weight management programs. We administered a computer-based survey to a convenience sample of children aged 11-17 years enrolled in five geographically diverse pediatric weight management (PWM) programs in the COMPASS (Childhood Obesity Multi-Program Analysis and Study System) network...
February 2017: Cyberpsychology, Behavior and Social Networking
https://www.readbyqxmd.com/read/28156494/embedding-palliative-care-pc-in-a-community-based-cancer-center-benefits-and-barriers
#9
John Weems, Robert D Siegel, Teresa N Bowen, Leigh Stinnett, Jennifer Ashley
153 Background: The importance of involving PC early in the disease process of oncology patients is well documented. Decreased symptom burden, increased quality of life, and extended survival are proven outcomes; however, the provision of PC has largely been limited to the acute care setting in most institutions. Bon Secours St. Francis Health System, a community based healthcare system in Greenville, South Carolina, opened a comprehensive cancer center in late 2014. Our established inpatient PC team began seeing outpatients at the cancer center shortly after its opening...
October 9, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28145128/small-prizes-improve-food-selection-in-a-school-cafeteria-without-increasing-waste
#10
Michelle E Hudgens, Allison S Barnes, Mary Kate Lockhart, Samantha C Ellsworth, Monna Beckford, Robert M Siegel
We recently demonstrated that small prizes given for a "Power Plate" (plain fat-free milk, entrée, fruit and vegetable) can be used in an elementary school cafeteria to increase healthful food selection by over 300%. The purpose of this study was to measure changes in food waste when the Power Plate (PP) program is implemented. The PP intervention was conducted at an inner-city elementary school. Emoticons were placed next to the preferred foods and children were given a small prize if they selected the PP...
February 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28132982/impact-of-mitral-annular-displacement-on-left-ventricular-diastolic-function-improvement-after-transcatheter-aortic-valve-implantation
#11
Hiroto Utsunomiya, Hirotsugu Mihara, Yuji Itabashi, Robert J Siegel, Tarun Chakravarty, Hasan Jilaihawi, Raj R Makkar, Takahiro Shiota
BACKGROUND: The clinical significance of left ventricular (LV) diastolic function (DF) improvement after transcatheter aortic valve implantation (TAVI) is not fully elucidated. We sought to investigate the long-term clinical and hemodynamic effects of post-TAVI DF improvement and to identify its determinants.Methods and Results:Clinical and serial echocardiographic data before and after TAVI were retrospectively reviewed together with measurement of mitral annular displacement (MAD) representing longitudinal myocardial function in 98 patients with severe aortic stenosis and ejection fraction >55%...
January 27, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28130803/mitral-annular-motion-in-patients-after-transcatheter-mitraclip-and-mitral-valve-surgery
#12
Kentaro Toyama, Florian Rader, Kengo Ayabe, Saibal Kar, Alfredo Trento, Toshihiko Nishioka, Michele A De Robertis, Robert J Siegel
BACKGROUND: Longitudinal motion of the mitral annulus is an index that reflects left ventricular (LV) function. The aim of this study was to evaluate and compare the effects of transcatheter mitral valve (MV) repair and open heart surgery for mitral regurgitation (MR) on mitral annular motion (MAM). METHODS: We retrospectively analyzed in total 115 patients who underwent isolated transcatheter MV repair using MitraClip (n=50) or surgical MV interventions (n=65, 50 repairs and 15 replacements) for MR...
March 2017: Echocardiography
https://www.readbyqxmd.com/read/28124907/discovery-and-synthesis-of-a-phosphoramidate-prodrug-of-a-pyrrolo-2-1-f-triazin-4-amino-adenine-c-nucleoside-gs-5734-for-the-treatment-of-ebola-and-emerging-viruses
#13
Dustin Siegel, Hon C Hui, Edward Doerffler, Michael O Clarke, Kwon Chun, Lijun Zhang, Sean Neville, Ernest Carra, Willard Lew, Bruce Ross, Queenie Wang, Lydia Wolfe, Robert Jordan, Veronica Soloveva, John Knox, Jason Perry, Michel Perron, Kirsten M Stray, Ona Barauskas, Joy Y Feng, Yili Xu, Gary Lee, Arnold L Rheingold, Adrian S Ray, Roy Bannister, Robert Strickley, Swami Swaminathan, William A Lee, Sina Bavari, Tomas Cihlar, Michael K Lo, Travis K Warren, Richard L Mackman
The recent Ebola virus (EBOV) outbreak in West Africa was the largest recorded in history with over 28,000 cases, resulting in >11,000 deaths including >500 healthcare workers. A focused screening and lead optimization effort identified 4b (GS-5734) with anti-EBOV EC50 = 86 nM in macrophages as the clinical candidate. Structure activity relationships established that the 1'-CN group and C-linked nucleobase were critical for optimal anti-EBOV potency and selectivity against host polymerases. A robust diastereoselective synthesis provided sufficient quantities of 4b to enable preclinical efficacy in a non-human-primate EBOV challenge model...
February 14, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28095388/the-use-of-mitraclip-for-symptomatic-patients-with-hypertrophic-obstructive-cardiomyopathy
#14
Felix Thomas, Florian Rader, Robert J Siegel
OBJECTIVES: Current nonpharmacological therapies for symptomatic patients with hypertrophic obstructive cardiomyopathy (HOCM), including septal myectomy and alcohol septal ablation (ASA), carry significant risks for serious cardiac conduction abnormalities. We present a review of the currently available published data regarding the novel use of the relatively low-risk MitraClip® system in the treatment of symptomatic patients. METHODS: Data were collected from 4 separate studies on the use of the MitraClip on 15 symptomatic HOCM patients with systolic anterior motion (SAM) of the mitral valve apparatus...
January 18, 2017: Cardiology
https://www.readbyqxmd.com/read/28094599/plasma-25-hydroxyvitamin-d3-levels-in-colorectal-cancer-patients-and-associations-with-physical-activity
#15
Stephanie Skender, Jürgen Böhm, Petra Schrotz-King, Jenny Chang-Claude, Erin M Siegel, Karen Steindorf, Robert W Owen, Jennifer Ose, Michael Hoffmeister, Hermann Brenner, Cornelia M Ulrich
Physical activity (PA) and vitamin D are thought to affect colorectal cancer prognosis. The present study investigates associations between 25(OH)D3 and PA in prospectively followed colorectal cancer patients in the ColoCare study. At 6, 12, and 24 mo after surgery, patients donated a blood sample, wore an accelerometer for 10 consecutive days, and completed a PA questionnaire. Plasma 25-hydroxyvitamin D3 (25(OH)D3) levels were measured by high-performance liquid chromatography. We tested associations using partial correlations and multivariate linear regression analysis, adjusted for season, age, and body mass index...
February 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28073806/functional-tricuspid-regurgitation-caused-by-chronic-atrial-fibrillation-a-real-time-3-dimensional-transesophageal-echocardiography-study
#16
Hiroto Utsunomiya, Yuji Itabashi, Hirotsugu Mihara, Javier Berdejo, Sayuki Kobayashi, Robert J Siegel, Takahiro Shiota
BACKGROUND: Functional tricuspid regurgitation (TR) with a structurally normal tricuspid valve (TV) may occur secondary to chronic atrial fibrillation (AF). However, the clinical and echocardiographic differences according to functional TR subtypes are unclear. Therefore, characterization of functional TR because of chronic AF (AF-TR) remains undetermined. METHODS AND RESULTS: To investigate the prevalence of AF-TR, 437 patients with moderate to severe TR underwent 3-dimensional (3D) transesophageal echocardiography...
January 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28068332/correction-tumor-evolution-in-two-patients-with-basal-like-breast-cancer-a-retrospective-genomics-study-of-multiple-metastases
#17
Katherine A Hoadley, Marni B Siegel, Krishna L Kanchi, Christopher A Miller, Li Ding, Wei Zhao, Xiaping He, Joel S Parker, Michael C Wendl, Robert S Fulton, Ryan T Demeter, Richard K Wilson, Lisa A Carey, Charles M Perou, Elaine R Mardis
[This corrects the article DOI: 10.1371/journal.pmed.1002174.].
January 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28056543/a-comparison-of-four-submaximal-tests-for-evaluating-change-in-fitness-in-youth-with-obesity
#18
Megan Emerson, Mary Kate Lockhart, Christopher Kist, Wayne Mays, Nicholas M Edwards, Shelley Kirk, Robert M Siegel
No abstract text is available yet for this article.
January 1, 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28052191/engineering-a-thermostable-keto-acid-decarboxylase-using-directed-evolution-and-computationally-directed-protein-design
#19
Lemuel M J Soh, Wai Shun Mak, Paul P Lin, Luo Mi, Frederic Y-H Chen, Robert Damoiseaux, Justin B Siegel, James C Liao
Keto acid decarboxylase (Kdc) is a key enzyme in producing keto acid derived higher alcohols, like isobutanol. The most active Kdc's are found in mesophiles; the only reported Kdc activity in thermophiles is 2 orders of magnitude less active. Therefore, the thermostability of mesophilic Kdc limits isobutanol production temperature. Here, we report development of a thermostable 2-ketoisovalerate decarboxylase (Kivd) with 10.5-fold increased residual activity after 1h preincubation at 60 °C. Starting with mesophilic Lactococcus lactis Kivd, a library was generated using random mutagenesis and approximately 8,000 independent variants were screened...
January 11, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28045923/germline-genetic-variants-in-tek-angpt1-angpt2-mmp9-fgf2-and-vegfa-are-associated-with-pathologic-complete-response-to-bevacizumab-in-breast-cancer-patients
#20
Issam Makhoul, Valentina K Todorova, Eric R Siegel, Stephen W Erickson, Ishwori Dhakal, Vinay R Raj, Jeannette Y Lee, Mohammed S Orloff, Robert J Griffin, Ronda S Henry-Tillman, Suzanne Klimberg, Laura F Hutchins, Susan A Kadlubar
BACKGROUND: We previously reported improved pathologic complete response (pCR) in a prospective phase II study using neoadjuvant bevacizumab in combination with chemotherapy compared to chemotherapy alone in breast cancer patients (41% vs. 25%, p = 0.0291). In this study, we queried germline single-nucleotide polymorphisms (SNPs) in angiogenesis-related genes for their impact on pCR and overall survival (OS). METHODS: DNA for genotyping was available from 34 subjects who received bevacizumab in addition to chemotherapy and 29 subjects who did not...
2017: PloS One
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