bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of gamma radiation on the noninjured and unprotected left main
Authors: Wolfram Roswitha , Cheneau Edouard , Lew Robert , Chan Rosanna , Pichard Augusto D. , Satler Lowell F. , Kent Kenneth M. , Dilcher Christian , Pinnow Ellen , Bui Anh , Waksman Ron 
Published: March 2004

AbstractThe aim of this study was to evaluate the effect of gamma radiation on the noninjured, unprotected left main coronary artery. Noninjured vessel segments are often radiated during treatment of in‐stent restenosis with PCI and gamma radiation. Angiographic analysis using QCA methods was performed on 55 left main arteries of patients (32 with radiation of the left main compared to 23 controls) who participated in the Washington Radiation for In‐Stent Restenosis Trials (WRIST). Baseline demographics and follow‐up were comparable between the two groups, concluding that gamma radiation with long radiation safety margins is feasible and safe. Gamma radiation of noninjured irradiated left main vessels when used to facilitate wide radiation margins for proximal irradiated injured LAD and LCx is safe and does not compromise the vessel integrity and its lumen. Catheter Cardiovasc Interv 2004;61:477–481. © 2004 Wiley‐Liss, Inc.
Acute aortic insufficiency complicating stent treatment of supravalvular aortic stenosis: Successful release of trapped leaflets by wiring the stent
Authors: Suárez de Lezo José , Pan Manuel , Medina Alfonso , Segura José , Pavlovic Djordje , Romero Miguel 
Published: March 2004

AbstractThis report shows the findings observed in a 7‐year‐old boy patient having severe supravalvular aortic stenosis who was treated by stent implantation. Immediately after deployment, a severe acute aortic insufficiency developed due to leaflets trapped by the stent. Release was attempted percutaneously. After wiring the proximal stent, snaring the wire and pulling smoothly, the leaflets came free and valve competence was completely restored. The procedure was then successfully completed, with no residual gradient or aortic insufficiency. Catheter Cardiovasc Interv 2004;61:537–541. © 2004 Wiley‐Liss, Inc.
Novel use of the Amplatzer duct occluder to close perivalvar leak involving a prosthetic mitral valve
Authors: Kort Henry W. , Sharkey Angela M. , Balzer David T. 
Published: March 2004

AbstractPerivalvar leak following atrioventricular valve replacement can result in heart failure or hemolytic anemia. These patients may be poor surgical candidates given a complex clinical condition. We describe transcatheter closure of a perivalvar leak in a 3‐month infant who had undergone left atrioventricular valve replacement with a St. Jude's prosthesis. Catheter Cardiovasc Interv 2004;61:548–551. © 2004 Wiley‐Liss, Inc.
Clinical and angiographic outcomes after overdilatation of undersized sirolimus‐eluting stents with largely oversized balloons: An observational study
Authors: Saia Francesco , Lemos Pedro A. , Arampatzis Chourmouzios A. , Hoye Angela , McFadden Eugene , Sianos Georgios , Smits Pieter C. , van der Giessen Willem J. , de Feyter Pim J. , van Domburg Ron T. , Serruys Patrick W. 
Published: March 2004

AbstractThe purpose of this study was to assess the safety and effectiveness of sirolimus‐eluting stent (SES) postdilatation with largely oversized balloons. We evaluated the clinical outcome of 68 consecutive patients enrolled in the Rapamycin‐Eluting Stent Evaluated at Rotterdam Cardiology Hospital (RESEARCH) registry who underwent percutaneous coronary intervention with SES implantation and further postdilatation with balloons > 1 mm larger than the stent nominal size. Angiographic follow‐up was either scheduled for selected subgroups or clinically driven. Overall, 75 lesions were treated. The procedure was successful in 98.5% of the cases. One patient (1.5%) underwent emergency coronary bypass surgery for acute vessel occlusion. During 10.1 ± 1.7 months of follow‐up, three patients (4.5%) died, one (1.5%) had acute myocardial infarction, and four (6%) had target vessel revascularization. At angiographic follow‐up, loss index was 0.13 ± 0.34 and restenosis rate was 7.7%. Although not routinely recommended in every patient, SES postdilatation with largely oversized balloons appears a safe and effective strategy for selected patients. Catheter Cardiovasc Interv 2004;61:455–460. © 2004 Wiley‐Liss, Inc.
Renal artery compromise treated percutaneously in a patient with chronic aortic dissection: A case report
Authors: Awadalla Hany M. , Salloum Joseph G. , Smalling Richard W. 
Published: March 2004

AbstractOrgan malperfusion most commonly occurs in the acute stage of aortic dissection and is associated with a high mortality, but can occur with chronic dissection. We describe a case of a type 3 aortic dissection, which had a stenosed left renal artery originating from the false lumen and causing resistant hypertension. The left renal artery was successfully dilated and stented, with prompt resolution of the patient's hypertension. Catheter Cardiovasc Interv 2004;61:445–449. © 2004 Wiley‐Liss, Inc.
Coronary rotational atherectomy in current practice: Acute and mid‐term results in high‐ and low‐volume centers
Authors: Rubartelli Paolo , Niccoli Luigi , Alberti Alessandro , Giachero Corinna , Ettori Federica , Missiroli Bindo , Bernardi Guglielmo , Maiello Luigi , Reimers Bernhard , Cernigliaro Carmelo , Sardella Gennaro , Bramucci Ezio 
Published: March 2004

AbstractWe conducted a prospective observational study to evaluate the indications, technique, in‐hospital and 9‐month results of consecutive patients treated with rotational atherectomy (RA) in 12 centers during 1 year, as well as their relationship with volume of RA activity. The study included 345 lesions in 289 patients treated (4.4% ± 2.6% of procedures at the participating centers). The lesions were mostly calcified (63%) and type B2 or C (74%). Procedural success was obtained in 94% of patients, with a major adverse cardiac event (MACE) rate of 4.5%. At 9 months, MACE occurred in 17.3%. Multivariate analysis identified multivessel disease and slow flow as negative predictors of procedural success, whereas balloon pressure ≤ 6 atm and hypercholesterolemia were associated with decreased MACE at 9 months. Center RA volume was not associated with in‐hospital or 9‐month outcome. We conclude that RA, even when used sporadically in selected complex lesions, can provide good immediate and mid‐term results. Catheter Cardiovasc Interv 2004;61:463–471. © 2004 Wiley‐Liss, Inc.
Advanced c‐myc antisense (AVI‐4126)‐eluting phosphorylcholine‐coated stent implantation is associated with complete vascular healing and reduced neointimal formation in the porcine coronary restenosis model
Authors: Kipshidze Nicholas N. , Iversen Patrick , Kim Han‐Soo , Yiazdi Hamid , Dangas George , Seaborn Rufus , New Gishel , Tio Fermin , Waksman Ron , Mehran Roxana , Tsapenko Mykola , Stone Gregg W. , Roubin Gary S. , Iyer Sriram , Leon Martin B. , Moses Jeffrey W. 
Published: March 2004

AbstractAn advanced six‐ring morpholino backbone c‐myc antisense (AVI‐4126) was shown to inhibit c‐myc expression and intimal hyperplasia after local catheter delivery in a porcine balloon injury model. The purpose of this study was to investigate the effects of an AVI‐4126‐eluting phosphorylcholine‐coated (PC) stent on c‐myc expression restenosis and vascular healing after stent implantation in porcine coronary arteries. PC stents were loaded with AVI‐4126 using soak trap. Nine pigs underwent AVI‐4126 PC coronary stent implantation (two stents/animal). Two to six hours postprocedure, three pigs were sacrificed and stented segments were analyzed by Western blot for c‐myc expression. In chronic experiments, six pigs (12 stent sites) were sacrificed at 28 days following intervention and vessels were perfusion‐fixed. High‐performance liquid chromatography analysis of plasma samples showed minimal presence of the antisense. Western blot analysis of the stented vessels demonstrated inhibition of c‐myc expression at 2 and 6 hr after procedure. Quantitative histologic morphometry showed that the neointimal area was significantly reduced (by 40%) in the antisense‐coated group compared with control (2.3 ± 0.7 vs. 3.9 ± 0.8 mm2, respectively; P = 0.0077). Immunostaining and electron microscopy demonstrated complete endothelialization, without fibrin deposition, thrombosis, or necrosis in all implanted stents. In the porcine coronary model, an advanced c‐myc‐eluting PC stent blocked c‐myc expression and significantly inhibited myointimal hyperplasia and allowed complete reendothelialization and healing response. Catheter Cardiovasc Interv 2004;61:518–527. © 2004 Wiley‐Liss, Inc.
Transradial approach for percutaneous transluminal angioplasty and stenting in the treatment of chronic mesenteric ischemia
Authors: Raghu Cherukupalli , Louvard Yves 
Published: March 2004

AbstractChronic mesenteric ischemia (CMI) occurs in the presence of slowly progressive, long‐standing stenoses of the visceral arteries secondary to atherosclerosis. Angioplasty and stenting are emerging as therapeutic alternatives to surgery in treating CMI. The transradial approach is an attractive alternative access for performing stenting in CMI at improved safety and ease. A case of CMI treated with stenting of the visceral arteries by both transradial and femoral approaches is presented here. The main difficulty in accessing the celiac and mesenteric arteries through the femoral approach is the angle between the aorta and these vessels, which often leads the operator to use multiple catheters. The main advantage of the radial approach (as well as the brachial one) is that it allows easy coaxial alignment of the catheter with the artery. The main problem is the inadequate length of the currently available catheters. The radial approach eliminates the risk for vascular complications and permits early ambulation. Catheter Cardiovasc Interv 2004;61:450–454. © 2004 Wiley‐Liss, Inc.
Temporary coronary guidewire pacing during percutaneous coronary intervention
Authors: Mixon Timothy A. , Cross Donald S. , Lawrence Mark E. , Gantt D. Scott , Dehmer Gregory J. 
Published: March 2004

AbstractTemporary pacing is occasionally required during percutaneous coronary artery interventions. This can be accomplished by the insertion of a temporary transvenous pacemaker wire into the right ventricle, but there is some risk and inconvenience associated with this approach. Temporary pacing using the coronary artery guidewire was described in 1985 but is used infrequently. Using currently available equipment, we evaluated guidewire pacing in 26 patients. Guidewire pacing was successful in all patients, but not with all coronary guidewires at acceptable ventricular capture thresholds. No complications occurred from guidewire pacing. Bench testing of multiple different wires showed several with very high resistances likely unsuitable for clinical use. Temporary guidewire pacing is easily performed and should be considered as an alternative to the separate placement of a temporary transvenous pacemaker. Catheter Cardiovasc Interv 2004;61:494–500. © 2004 Wiley‐Liss, Inc.
Comparison of combination therapy of adenosine and nitroprusside with adenosine alone in the treatment of angiographic no‐reflow phenomenon
Authors: Barcin Cem , Denktas Ali E. , Lennon Ryan J. , Hammes LaVon , Higano Stuart T. , Holmes David R. , Garratt Kirk N. , Lerman Amir 
Published: March 2004

AbstractWe sought to compare the combination therapy of adenosine and nitroprusside in no‐reflow phenomenon during percutaneous coronary intervention. Improvement in coronary flow from no‐reflow to postdrug state was evaluated. Patients who received adenosine (n = 21) were compared to ones who received the combination of adenosine and nitroprusside (n = 20) for treatment. Improvement of TIMI flow grades was higher in the group that received combined therapy (1.5 ± 1.0 vs. 0.8 ± 0.6; P < 0.05). Combination therapy of adenosine and nitroprusside is safe and provides better improvement in coronary flow compared to intracoronary adenosine alone in case of impaired flow during coronary interventions. Catheter Cardiovasc Interv 2004;61:484–491. © 2004 Wiley‐Liss, Inc.
Embolization and retrieval of the Amplatzer septal occluder
Authors: Levi Daniel S. , Moore John W. 
Published: March 2004

AbstractEmbolization and percutaneous retrieval of the Amplatzer septal occluder (ASO) after release have been reported. However, the incidence, the causes of embolization, and the methods for effective retrieval have not been systematically described. In a survey of the ASO company‐designated proctors, the incidence of ASO embolization in this group's experience was 0.55% (21 embolizations in 3,824 device placements) with a wide range of patient demographics, atrial septal defect (ASD) sizes, and device sizes. Most embolizations occurred because of inadequate rim or undersized devices. Of the 21 embolizations, 15 of the devices were retrieved percutaneously with a gooseneck snare without morbidity or mortality. Six were retrieved at surgery. Of the 21 patients, 12 had ASO closure of their ASDs, and 9 had surgical ASD closure. In vitro, all devices could be retrieved with sheathes 2 Fr sizes larger than their recommended delivery sheath. Any device larger than 26 mm could be retrieved with its delivery sheath. The ability to pull the snared button into a sheath was variable and was assisted by pulling the device from above with a bioptome and by using a rigid notched sheath. Because the incidence of ASO embolization is about 1 in 200 in the most experienced hands, all operators should be prepared with the techniques and equipment required for percutaneous ASO retrieval. Catheter Cardiovasc Interv 2004;61:543–547. © 2004 Wiley‐Liss, Inc.
Distal protection of bifurcating vessels: A novel approach
Authors: Gerganski Penko , Meerkin David , Lotan Chaim 
Published: March 2004

AbstractDistal protection devices protect only a single distal vessel. We describe a novel technique to protect both branches following a thrombus‐containing bifurcation lesion. The combination of an occlusive balloon and an arterial filter system provides an attractive solution to the challenging environment of a lesion at high risk for distal embolization supplying more than a single major branch. Catheter Cardiovasc Interv 2004;61:512–514. © 2004 Wiley‐Liss, Inc.
Myonecrosis following stent placement: Association between impaired TIMI myocardial perfusion grade and MRI visualization of microinfarction
Authors: Choi James W. , Gibson C. Michael , Murphy Sabina A. , Davidson Charles J. , Kim Raymond J. , Ricciardi Mark J. 
Published: March 2004

AbstractContrast‐enhanced cardiac MRI (ceMRI) and TIMI myocardial perfusion grade analysis (TMPG) are proven methods for visualization of microinfarction and assessment of microvascular perfusion, respectively. To determine whether microvascular obstruction accounts for procedure‐related myonecrosis, 14 poststent patients, 9 with procedural CK‐MB elevation and 5 controls, underwent ceMRI and TMPG. All had TIMI 3 flow pre‐ and poststent. TMPG was normal in 12/14 pre‐ and 7/14 poststent. Those with poststent decline in TMPG had higher CK‐MB (median, 41.0 vs. 7.4 ng/mL; P = 0.01) and larger infarct mass (median, 3.1 vs. 0.89 g; P = 0.04). More extensive myonecrosis (CK‐MB > 3 × normal; infarct mass > 3 g) was observed more frequently if there was a poststent decline in TMPG (3/3, 100%, vs. 2/11, 18.2%; P = 0.03). These data support the theory that distal embolization and microvascular obstruction are associated with myonecrosis following otherwise successful coronary stent placement and provide further insight into its pathophysiology. Catheter Cardiovasc Interv 2004;61:472–476. © 2004 Wiley‐Liss, Inc.
Modeling Nonsteady‐State Regimes of Dilute Pneumatic Conveying
Authors: Eskin D. , Leonenko Y. , Vinogradov O. 
Published: March 2004

AbstractThe nonsteady‐state gas‐particle flows in pipelines are considered. Chaotically moving particles are described as granular gas characterized by granular temperature. This temperature dissipates because of partially inelastic particle collisions with the wall, with each other and also because of the particle viscous friction with gas. The energy losses on a microscale are translated into the pressure losses on a macroscale. The model developed is validated for both steady‐state and nonsteady‐state regimes by comparing calculated pressure losses with experimental data. A detailed numerical study of the nonsteady‐state flows shows that the pipe wall roughness is a major parameter affecting the pressure drop. Flow regimes for different particle elastic properties, particle sizes, and solids loading are studied.
Liquid/Solid Mass Transfer in Fixed Beds
Authors: Zaki M. , Nirdosh I. , Sedahmed G.H. , Baird M.H.I. 
Published: March 2004

AbstractThe liquid/solid mass transfer behavior of a fixed bed of cylinders was studied using the diffusion‐controlled dissolution of copper in acidified potassium dichromate. Variables studied were solution velocity and cylinder diameter. For a steady flow, the data were correlated for the conditions 25 < Re < 600 and Sc = 990 by the equation Sh = 2.65 Sc0.33 Re0.5. A comparison between the present data and previously obtained data for a fixed bed of Raschig rings has revealed that cylinder packing produces higher rates of mass transfer than Raschig rings.
Dynamics of Capillary Electrochromatography: Experimental Study of Flow and Transport in Particulate Beds
Authors: Chen G. , Pačes M. , Marek M. , Zhang Y. , Seidel‐Morgenstern A. , Tallarek U. 
Published: March 2004

AbstractThe chromatographic performance with respect to the flow behavior and dispersion in fixed beds of nonporous and macroporous particles (having mean intraparticle pore diameters of 41, 105, and 232 nm) has been studied in capillary HPLC and electrochromatography. The existence of substantial electroosmotic intraparticle pore flow (perfusive electroosmosis) in columns packed with the macroporous particles was found to reduce stagnant mobile mass transfer resistance and decrease the global flow inhomogeneity over the column cross‐section, leading to a significant improvement in column efficiency compared to capillary HPLC. The effect of electroosmotic perfusion on axial dispersion was shown to be sensitive to the mobile phase ionic strength and mean intraparticle pore diameter, thus, on an electrical double layer interaction within the particles. Complementary and consistent results were observed for the average electroosmotic flow through packed capillaries. It was found to depend on particle porosity and distinct contributions to the electrical double layer behavior within and between particles. Based on these data an optimum chromatographic performance in view of speed and efficiency can be achieved by straightforward adjustment of the electrolyte concentration and characteristic intraparticle pore size.
The Effect of Solids Inventory and Other Factors on the Axial Solids Holdup Profiles in a Twin‐Riser System
Authors: Yan A.‐J. , Zhu J. (Jing‐Xu) , Remize P.‐J. , Bordas A. 
Published: March 2004

AbstractThe axial profiles of cross‐sectional average solids holdup profiles were studied in two 10 m long, 76 mm i. d. and 203 mm i. d. risers with the solids circulation rate up to 550 kg/m2s, superficial gas velocities up to 10.0 m/s, and solids inventory up to 410 kg in the 320 mm i. d. storage tank. The shape of the axial profiles of the cross‐sectional average solids holdup changes with solids fluxes. Under high‐flux conditions, the shapes of the profiles are quite different from those under low‐flux conditions. It is clear that solids holdup increases with the increase of solids fluxes. While the superficial gas velocities have no obvious influence on the shape of the axial profiles of the cross‐sectional average solids holdup under given solids flux for both risers, solids holdup decreases with the increase of superficial gas velocity under all solids inventories. The solids inventory and riser diameter have little influence on the shape of the profile, but the solids holdup is higher with larger bed diameter and/or larger solids inventory. Meanwhile, the solids inventory and riser diameter have important influence on the maximum value of operating solids fluxes of the system. The maximum of solids fluxes increases with the increase of solids inventory, and decreases with the increase of riser diameter.
CFD Modeling of a Bubble Column Reactor Carrying out a Consecutive A → B → C Reaction
Authors: van Baten J.M. , Krishna R. 
Published: March 2004

AbstractIn this paper, we develop a CFD model for describing a bubble column reactor for carrying out a consecutive first‐order reaction sequence A → B → C. Three reactor configurations, all operating in the homogeneous bubbly regime, were investigated: (I) column diameter DT = 0.1 m, column height HT = 1.1 m, (II) DT = 0.1 m, HT = 2 m, and (III) DT = 1 m, HT = 5 m. Eulerian simulations were carried out for superficial gas velocities UG in the range of 0.005–0.04 m/s, assuming cylindrical axisymmetry. Additionally, for configurations I and III fully three‐dimensional transient simulations were carried out for checking the assumption of cylindrical axisymmetry. For the 0.1 m diameter column (configuration I), 2‐D axisymmetric and 3‐D transient simulations yield nearly the same results for gas holdup ϵG, centerline liquid velocity VL(0), conversion of A, χA, and selectivity to B, SB. In sharp contrast, for the 1 m diameter column (configuration III), there are significant differences in the CFD predictions of ϵG, VL(0), χA, and SB using 2‐D and 3‐D simulations; the 2‐D strategies tend to exaggerate VL(0), and underpredict ϵG, χA, and SB. The transient 3‐D simulation results appear to be more realistic. The CFD simulation results for χA and SB are also compared with a simple analytic model, often employed in practice, in which the gas phase is assumed to be in plug flow and the liquid phase is well mixed. For the smaller diameter columns (configurations I and II) the CFD simulation results for χA are in excellent agreement with the analytic model, but for the larger diameter column the analytic model is somewhat optimistic. There are two reasons for this deviation. Firstly, the gas phase is not in perfect plug flow and secondly, the liquid phase is not perfectly mixed. The computational results obtained in this paper demonstrate the power of CFD for predicting the performance of bubble column reactors. Of particular use is the ability of CFD to describe scale effects.
Dynamic Analysis of Diffusion and Adsorption of Water‐Miscible and Water‐Immiscible Organic Vapors in Soil
Authors: Kalender M. , Akosman C. 
Published: March 2004

AbstractA dynamic analysis of the diffusion and adsorption of water‐miscible volatile organic compounds (methanol and acetone) and water‐immiscible volatile organic compounds (benzene and toluene) in a soil pellet has been performed experimentally by using the single pellet moment technique. The experiments were conducted in a one‐sided single pellet adsorption cell at a temperature of 30 °C and varying relative humidities (0, 20, and 40 %). The results obtained with dry and wet systems showed that volatile organic tracers were adsorbed reversibly onto the soil. The overall adsorption equilibrium constants of both water‐miscible and water immiscible volatile organic compounds decreased with relative humidity. The sorption of water‐immiscible VOCs (benzene) onto soil was found to be much less than that of water‐miscible VOCs (methanol). The effective diffusivity of water‐immiscible volatile organic vapor (benzene) in the soil did not show a considerable change with relative humidity. In contrast, there was an appreciable change in the effective diffusivity for water‐miscible VOCs (methanol) with moisture.