bluuebunny/crossref_metadata_2025_split huggingface dataset:
Location of femoral artery access and correlation with vascular complications
Authors: Pitta Sridevi R. , Prasad Abhiram , Kumar Gautam , Lennon Ryan , Rihal Charanjit S. , Holmes David R. 
Published: March 2011

AbstractObjectives: The aim of the study was to document the frequency of optimal femoral artery access location and its correlation with vascular complications in contemporary practice. Background: Vascular access bleeding during coronary interventions is associated with adverse outcomes. A potential strategy for reducing access‐site bleeding is to achieve optimal location for the femoral access. However, there is a paucity of data on how well this goal is achieved in clinical practice using anatomical landmarks. Methods: We retrospectively evaluated femoral angiograms of 300 patients undergoing percutaneous coronary intervention to identify the location of the access that had been performed using anatomical landmarks. Patients were divided into two groups based on the location of the arterial access: above the femoral bifurcation but below the inferior border of the inferior epigastric artery (optimal location) and those that were either above or below these landmarks (suboptimal location). Frequency of access site complications was recorded. Results: The femoral artery access site was located outside the optimal location in 38 (13.0%) patients. There was no significant difference regards to baseline characteristics. Overall, access‐related complications occurred in 17 (5.7%) patients. Vascular complications were significantly more frequent in patients who had a femoral artery access outside the optimal location (18% vs. 4%, P < 0.001). Conclusions: The femoral artery access site is not at the optimal location in a significant proportion of patients, and this is associated with an increased risk of vascular complications. Improving the rates of optimal arterial access by routine use of fluoroscopy or ultrasound guidance has the potential of reducing vascular complications and improving outcomes. © 2011 Wiley‐Liss, Inc.
Bare‐metal stent thrombosis after noncardiac surgery greater than 10 years after stent implantation
Authors: Willis Nicholas , Sachdeva Rajesh , Uretsky Barry F. 
Published: March 2011

AbstractWe present a case of bare‐metal stent thrombosis (ST) in a saphenous vein graft (SVG) after antiplatelet therapy cessation occurring in the setting of noncardiac surgery (NCS) greater than 10 years after stent implantation. This report represents the longest interval of ST in the setting of NCS and the longest interval between stent implantation and ST in a SVG. © 2011 Wiley‐Liss, Inc.
Management of radial artery perforation during coronary angiography and angioplasty—A report of two cases
Authors: Pujara Kushal , Wood Alice , Roberts Elved B. 
Published: March 2011

AbstractPerforation and disruption of the artery used for access is a recognized complication of coronary angiography. There is an increasing trend toward use of the radial artery for angiography and angioplasty, particularly in the primary angioplasty setting, because of the reduced risk of hemorrhagic complications. On the rare occasions when radial artery perforation occurs, operators have had a tendency to switch to a second arterial access route. This article describes a technique for managing peri‐procedural perforation which does not require use of a second artery for access. We show two cases where this technique was used successfully, demonstrating an angiographically normal radial artery at the end of the procedure. © 2011 Wiley‐Liss, Inc.
Spontaneous coronary artery dissection after intense weightlifting UCSF fresno department of cardiology
Authors: El‐Sherief Karim , Rashidian Ali , Srikanth Sundararajan 
Published: March 2011

AbstractSpontaneous coronary artery dissection (SCAD) is a rare cause of chest pain and cardiomyopathy. This phenomenon usually occurs during the peripartum period. SCAD associated with exercise and heavy weight lifting is even rarer and has been reported in less than 10 cases in the literature. We describe a case of SCAD associated with heavy weight lifting and exercise in a 29‐year‐old male who presented with exertional chest pain. The patient subsequently underwent a cardiac catheterization that showed a left ventricular ejection fraction of 40% and a dissection in the left anterior descending (LAD) coronary artery after the first diagonal/septal branch with extension to the distal LAD that wrapped around the apex. He was effectively managed with the combination of medical therapy followed by a few days later with stenting. In summary, diagnosis and treatment of this rare phenomenon is a challenge, but early diagnosis and appropriate management can lead to a successful outcome. © 2011 Wiley‐Liss, Inc.
Dual wire technique for aortic coarctation stent placement
Authors: Lampropoulos Konstantinos , Budts Werner , Gewillig Marc 
Published: March 2011

AbstractA young adult presented for percutaneous treatment of a narrow aortic coarctation. A very large left subclavian artery originated immediately proximal to the coarctation. In order not to exclude or jail the left subclavian artery with a stent, a double wire technique was used. From a femoral approach, two guide wires were positioned, one in the aortic arch and another in the subclavian artery. A stent crimped over a 16‐mm balloon and a 4‐Fr catheter was advanced over the two wires within a 14‐Fr long introducer sheath. The stent was successfully deployed and molded within the bifurcation by a kissing balloon technique, relieving the obstruction and leaving a guaranteed passage to the subclavian artery. The double wire technique is an elegant way to deliver a stent safely across a narrowing with guaranteed access to important side branches. © 2011 Wiley‐Liss, Inc.
A novel clinical prediction rule for 30‐day mortality following balloon aortic valuloplasty: The CRRAC the AV score
Authors: Elmariah Sammy , Lubitz Steven A. , Shah Amil M. , Miller Marc A. , Kaplish Dheeraj , Kothari Sharad , Moreno Pedro R. , Kini Annapoorna S. , Sharma Samin K. 
Published: March 2011

AbstractObjectives: We seek to identify predictors of 30‐day mortality after balloon aortic valvuloplasty (BAV). Background: To date, there is no validated method of predicting patient outcomes after percutaneous aortic valve interventions. Methods: Data for consecutive patients with severe aortic stenosis who underwent BAV at the Mount Sinai Medical Center from January 2001 to July 2007 were retrospectively reviewed. Cox‐proportional hazards regression was used to identify significant predictors of 30‐day mortality, and the resultant model was compared to the EuroSCORE using Akaike's Information Criterion and area under the receiver‐operating curve (AUC). Results: The analysis included 281 patients (age 83 ± 9 years, 61% women, aortic valve area: 0.64 ± 0.2 cm2) and 36 (12.8%) of whom died within 30 days of BAV. With identified risk factors for 30‐day mortality, critical status, renal dysfunction, right atrial pressure, and cardiac output, we constructed the CRRAC the AV risk score. Thirty‐day survival was 72% in the highest tertile versus 94% in the lower two tertiles of the score. Compared to the additive and logistic EuroSCORE, the risk score demonstrated superior discrimination (AUC = 0.75 vs. 0.60 and 0.63, respectively). Conclusions: We derived a risk score, the CRRAC the AV score that identifies patients at high‐risk of 30‐day mortality after BAV. Validation of the developed risk prediction score, the CRRAC the AV score, is needed in other cohorts of post‐BAV patients and potentially in patients undergoing other catheter‐based valve interventions. © 2010 Wiley‐Liss, Inc.
Endovascular treatment of thrombosed dialysis fistulae
Authors: Bizarro Pedro , Coentrão Luís , Ribeiro Carlos , Neto Ricardo , Pestana Manuel 
Published: March 2011

AbstractObjectives: In the present study, we determined the cumulative costs and outcomes of endovascular treatment of thrombosed autogenous arteriovenous fistulae (AVF) at our medical center. Background: Previous studies examining the salvage procedures of thrombosed AVFs have focused exclusively on clinical outcomes, and, in the absence of costing data, current guidelines do not take into consideration economic issues. Methods: A retrospective cohort study was performed among local hemodialysis patients with completely thrombosed AVFs receiving endovascular treatment in our institution between January 1 and December 31, 2008. Forty‐four patients were enrolled and followed‐up for 1 year. Success and complications were recorded according to consensus definitions, and a comprehensive measurement of total vascular access care‐related costs was obtained. Costs are reported in 2010 in U.S. dollars. Results: Clinical success was achieved in 95% of cases. The primary and secondary patency rates were 63 and 78% at 1 year, respectively. Primary patency rate at 12 months was significantly better for radiocephalic AVFs (70% vs. 43%; P = 0.047). The mean cumulative cost of all vascular access care during year 1 was $2,504 (median $1,484; range, $1,362–$18,279; Table V) per patient‐year at risk. The mean cumulative cost for maintaining radiocephalic and brachiocephalic AVFs was $1,624 (median $1,381; range, $1,130–$3,116) and $3,578 (median $2,092; range, $1,470–$18,279) per patient‐year at risk, respectively (P = 0.022). Conclusion: The cost of maintenance of a thrombosed AVF by endovascular intervention is high, with patients with clotted radiocephalic fistulae incurring the lowest costs and achieving higher survival times. © 2011 Wiley‐Liss, Inc.
Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces
Authors: Man Isabela C. , Su Hai‐Yan , Calle‐Vallejo Federico , Hansen Heine A. , Martínez José I. , Inoglu Nilay G. , Kitchin John , Jaramillo Thomas F. , Nørskov Jens K. , Rossmeisl Jan 
Published: March 2011

AbstractTrends in electrocatalytic activity of the oxygen evolution reaction (OER) are investigated on the basis of a large database of HO* and HOO* adsorption energies on oxide surfaces. The theoretical overpotential was calculated by applying standard density functional theory in combination with the computational standard hydrogen electrode (SHE) model. We showed that by the discovery of a universal scaling relation between the adsorption energies of HOO* vs HO*, it is possible to analyze the reaction free energy diagrams of all the oxides in a general way. This gave rise to an activity volcano that was the same for a wide variety of oxide catalyst materials and a universal descriptor for the oxygen evolution activity, which suggests a fundamental limitation on the maximum oxygen evolution activity of planar oxide catalysts.
How are symptoms of ovarian cancer managed?
Authors: Goff Barbara A. , Matthews Barbara , Andrilla C. Holly A. , Miller Jacqueline W. , Trivers Katrina F. , Berry Donna , Lishner Denise M. , Baldwin Laura‐Mae 
Published: March 2011

AbstractBACKGROUND:A study was undertaken to identify the diagnostic approaches that primary care physicians and gynecologists undertake in women with symptoms associated with ovarian cancer.METHODS:A vignette‐based survey was mailed to 3200 primary care physicians from the American Medical Association Physician Masterfile. The vignette described a 55‐year‐old woman with symptoms associated with ovarian cancer, although ovarian cancer was never mentioned. The authors evaluated patient, physician, and practice characteristics associated with a workup that could detect ovarian cancer.RESULTS:The survey response rate was 61.7%. After exclusions, 1532 physicians were included. Overall, 89.5% of physicians reported that they would recommend testing that can detect ovarian cancer (71.2% ultrasound; 25.4% pelvic computed tomography; 26.5% CA125). In adjusted analysis, the only patient factor associated with ovarian cancer testing was symptom type, genitourinary versus gastrointestinal (risk ratio, 1.07; 95% confidence interval, 1.03‐1.11). Physician and practice characteristics associated with recommending of ovarian cancer testing included specialty (gynecologists > family physicians and internists); type of practice (group > solo); clinical teaching (yes > no); and within Census division, location of practice, with all Central (East, West, North, and South) and Atlantic (Middle and South) areas having a lower likelihood than New England.CONCLUSIONS:On the basis of a vignette in which a woman reported symptoms associated with ovarian cancer, the majority of primary care physicians and gynecologists would not recommend CA125, but would recommend imaging of the pelvis. Gynecologists, physicians involved with clinical teaching, and those in group practices were significantly more likely to recommend testing that could lead to an ovarian cancer diagnosis. Cancer 2011;. © 2011 American Cancer Society.
Equivocal cytology in lung cancer diagnosis
Authors: Schramm Martin , Wrobel Christian , Born Ingmar , Kazimirek Marietta , Pomjanski Natalia , William Marina , Kappes Rainer , Gerharz Claus Dieter , Biesterfeld Stefan , Böcking Alfred 
Published: March 2011

AbstractBACKGROUND:Sometimes, cytological lung cancer diagnosis is challenging because equivocal diagnoses are common. To enhance diagnostic accuracy, fluorescent in situ hybridization (FISH), DNA‐image cytometry, and quantitative promoter hypermethylation analysis have been proposed as adjuncts.METHODS:Bronchial washings and/or brushings or transbronchial fine‐needle aspiration biopsies were prospectively collected from patients who were clinically suspected of having lung carcinoma. After routine cytological diagnosis, 70 consecutive specimens, each cytologically diagnosed as negative, equivocal, or positive for cancer cells, were investigated with adjuvant methods. Suspicious areas on the smears were restained with the LAVysion multicolor FISH probe set (Abbott Molecular, Des Plaines, Illinois) or according to the Feulgen Staining Method for DNA‐image cytometry analysis. DNA was extracted from residual liquid material, and frequencies of aberrant methylation of APC, p16INK4A, and RASSF1A gene promoters were determined with quantitative methylation‐specific polymerase chain reaction (QMSP) after bisulfite conversion. Clinical and histological follow‐up according to a reference standard, defined in advance, were available for 198 of 210 patients.RESULTS:In the whole cohort, cytology, FISH, DNA‐image cytometry, and QMSP achieved sensitivities of 83.7%, 78%, 79%, and 49.6%, respectively (specificities of 69.8%, 98.2%, 98.2%, and 98.4%, respectively). Subsequent to cytologically equivocal diagnoses, FISH, DNA‐image cytometry, and QMSP definitely identified malignancy in 79%, 83%, and 49%, respectively. With QMSP, 4 of 22 cancer patients with cytologically negative diagnoses were correctly identified.CONCLUSIONS:Thus, adjuvant FISH or DNA‐image cytometry in cytologically equivocal diagnoses improves diagnostic accuracy at comparable rates. Adjuvant QMSP in cytologically negative cases with persistent suspicion of lung cancer would enhance sensitivity. Cancer (Cancer Cytopathol) 2011;. © 2011 American Cancer Society.
Cooperation in bike racing—When to work together and when to go it alone
Authors: Hoenigman Rhonda , Bradley Elizabeth , Lim Allen 
Published: March 2011

AbstractWe present an agent‐based model of bicycle racing that incorporates both physiology and the types of multiplayer scenarios that arise in real races. In these scenarios, riders can choose to share the workload with other riders (cooperate) or pursue their own self‐interests (defect). We compare the model's predictions to race situations and use it to investigate how different strategies can affect outcomes. We find that an individual player's best strategy depends on fitness level: below‐average riders fare better as defectors whereas above‐average riders perform better as cooperators. The strategies of stronger riders affect their teammates' results as well. The teammates of defecting strong riders fare worse overall than the teammates of cooperating strong riders. These results reproduce a dynamic that played out in the 2009 Tour de France. The winner, Alberto Contador, pursued a strategy perceived by many to be unusually uncooperative by repeatedly defecting on his teammates. The strategy worked to his advantage but may have negatively affected his teammates' placements. © 2011 Wiley Periodicals, Inc. Complexity, 17,39–44, 2011
Observation of K‐Shell Soft X Ray Emission of Nitrogen Irradiated by XUV‐Free Electron Laser FLASH at Intensities Greater than 1016 W/cm2
Authors: Galtier E. , Rosmej F.B. , Renner O. , Juha L. , Chalupsky J. , Gauthier J.‐C. , White S. , Riley D. , Vinko S. , Witcher T. , Wark J. , Nagler B. , Lee R.W. , Nelson A.J. , Toleikis S. 
Published: March 2011

AbstractIn the past few years, the development of light sources of the 4th generation, namely XUV/X‐ray Free Electron Lasers provides to the scientific community outstanding tools to investigate matter under extreme conditions never obtained in laboratories so far. As theory is at its infancy, the analysis of matter via the self‐emission of the target is of central importance. The characterization of such dense matter is possible if photons can escape the medium. As the absorption of K‐shell X‐ray transitions is minimal, it plays a key role in this study. We report here the first successful observation of K‐shell emission of Nitrogen at 430 eV using an XUV‐Free Electron Laser to irradiate solid Boron Nitride targets under exceptional conditions: photon energy of 92 eV, pulse duration of ∼20 fs, micro focusing leading to intensities larger than 1016 W/cm2. Using a Bragg crystal of THM coupled to a CCD, we resolved K‐shell line emission from different charge states. We demonstrate that the spectroscopic data allow characterization of electron heating processes when X‐ray radiation is interacting with solid matter. As energy transport is non‐trivial because the light source is monochromatic, these results have an important impact on the theory (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optical Spectroscopy of Free‐Propagating Plasma and Its Interaction with Tungsten Targets in PF‐1000 Facility
Authors: Skladnik‐Sadowska E. , Malinowski K. , Sadowski M.J. , Kubkowska M. , Jakubowska K. , Paduch M. , Scholz M. , Garkusha I.E. , Ladygina M. , Tereshin V.I. 
Published: March 2011

AbstractThe paper describes the application of optical spectroscopy methods for investigation of intense plasma streams, which are emitted from the large PF‐1000 facility operated at 21‐27 kV, 290‐480 kJ, as well as for studies of interactions of such streams with tungsten (W) targets. The electron concentration, as estimated from the Stark broadening of the Dβ line recorded at a distance of z = 30 cm from the electrode ends, changed from about 2.2×1016 to 0.5×1016 cm–3 in about 5 µs. Spectroscopic measurements were also carried out in experiments performed with a pure W‐target placed at z = 30 cm. There were for the first time in PF‐1000 recorded and identified many WI and WII lines. In some cases an analysis of the Dβ line was impossible because of its very strong re‐absorption. A quantitative analysis of the W‐lines was not performed, but some information about dynamics of the W‐ions production was obtained (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Experimental Design and Probe Diagnostics for Simulation of AMS02‐Magnet'effects in Ionospheric Plasma Flow Near International Space Station
Authors: Zakharov Yu.P. , Antonov V.M. , Shaikhislamov I.F. , Boyarintsev E.L. , Melekhov A.V. , Vchivkov K.V. , Prokopov P.A. 
Published: March 2011

AbstractExperimental study of specific features in a plasma‐dipole interaction was done for the first time in a low density case, characteristic for the conditions of planned AMS‐02 mission to the board of ISS. Results of such “Dipole” experiment and relevant set of special probe methods for diagnostics of plasma and fields are described (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Reflectometry Simulations on Different Methods to Extract Fusion Plasma Turbulence Characteristics and Its Dynamics
Authors: Heuraux S. , da Silva F. , Gusakov E. Z. , Popov A. Yu , Beauvier E. , Kosolapova N. , Syisoeva K. 
Published: March 2011

AbstractThe knowledge of turbulent transport is the key issue for the future of fusion plasma devices. A first step towards this goal rests in obtaining measurements concerning turbulence characteristics or transient events, which are required for the understanding of the transport phenomena. A possible way to obtain density fluctuations parameters is to use microwaves to probe fusion plasmas. However the interpretation of the received signals requires a model for reaching the accurate evaluation of the wanted parameters. Simulations of electromagnetic wave propagation in fluctuating plasmas permit to identify the signature of expected events and to model them. In the present work, it is shown how simulations have permitted to exhibit the role of the resonances of the probing wave induced by turbulence and to explain part of the origin of phase jumps seen during reflectometer measurements. Multi‐scattering phenomena, taking into account wave trapping, can be simulated and show that the probing wave can continue to reach in average the cut‐off layer as it is the case for a quiet plasma. These results suggest that it is possible to extract information on the turbulence at density fluctuations levels higher than allowed by usual methods using the framework of Born approximation. The software developed for reflectometry simulations is also used to compute and explain the frequency spectrum associated to Alfven's cascades seen with fixed frequency reflectometers working without a cut‐off layer in the probed tokamak plasma. To finish, possible ways to extract the properties of a turbulent wavefront and its dynamics are explored for the ultra‐fast frequency sweep reflectometer and for a reflectometer working as a backscattering diagnostics at fixed frequency. The physical aspects and the technical requirements are presented for each studied case (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
GC‐MS Investigation of Organosilicon and Fluorocarbon Fed Plasmas
Authors: Fanelli F. , Fracassi F. , Lovascio S. , d'Agostino R. 
Published: March 2011

AbstractThis paper deals with the GC‐MS investigation of the exhaust gas of atmospheric pressure PE‐CVD processes in organosilicon‐ and fluorocarbon‐containing dielectric barrier discharges. The extent of unreacted monomer and the quali‐quantitative distribution of by‐products have been investigated as a function of the feed composition. The results confirm that GC‐MS is a powerful indirect diagnostic technique of the plasma phase since it allows to hypothesize some of the reactive moieties formed in the plasma and to clarify some aspects of the deposition mechanism (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)