bluuebunny/crossref_metadata_2025_split huggingface dataset:
Percutaneous Transfemoral Coronary Arteriography Without Systemic Anticoagulation—A Review of 648 Consecutive Procedures
Authors: Rich John M. , Cobb Tyson C. , Leighton Richard F. 
Published: February 2007

AbstractExperience with 648 consecutive percutaneous transfemoral coronary arteriograms and left ventriculograms performed in a teaching laboratory without the use of systemic anticoagulation during the procedure was reviewed. Only 1 death was felt to be related to a procedure, and this occurred 3 weeks after a myocardial infarction. There were 10 myocardial infarctions or emboli, 8 cerebral vascular accidents, and 7 femoral artery complications. Only 1 patient experienced a residual neurologic change following a procedure‐related cerebral vascular accident, and this was a mild visual field defect. Clotting of the catheter without sequelae but necessitating procedural changes occurred in 10 instances. The transient nature of the neurologic deficits and the low mortality suggest that the emboli which occurred in these patients were small, possibly platelet‐fibrin accumulations. It is postulated that with the use of careful technic larger emboli capable of producing myocardial infarction with shock or disabling cerebral vascular accidents can be prevented, even in a training situation. However, smaller embolic phenomena probably cannot be completely avoided by the use of careful technic, and it is for prevention of small emboli that systemic anticoagulation with heparin may be of value.
Wegener's Granulomatosis: Angiographic Study and Case Report with Prolonged Survival
Authors: Edelstein Michael M. , Wexler Morton , Freed Ezekiel 
Published: February 2007

AbstractIn the limited form of Wegener's granulomatosis pulmonary arteries were pruned and slightly stretched by a cavitating granuloma. Bronchial and renal vasculature were normal. The microscopic focal small vessel changes are not appreciable at angiography.Therefore, angiography is of no value in establishing the diagnosis of Wegener's granulomatosis.
Coronary Arterial Spasm in Classic Angina Pectoris
Authors: Chahine Robert A. , Raizner Albert E. , Luchi Robert J. 
Published: February 2007

AbstractA 47‐year‐old black male who presented with classical angina pectoris and positive exercise test developed spasm of the right coronary artery in the vicinity of an atherosclerotic lesion resulting in transient total occlusion of the vessel. It seemed unlikely that spasm was catheter induced in this case, and the vessel relaxed promptly following nitroglycerin administration. The occurrence of severe spasm in proximity to atherosclerotic narrowing of coronary artery may contribute to stable and unstable angina, myocardial infarction, and sudden death in patients with these conditions coexisting. The awareness of such a phenomenon is necessary to avoid serious errors in the interpretation of coronary angiograms.
Origin of the Sinoatrial Node and Atrioventricular Node Arteries in Right, Mixed, and Left Inferior Emphasis Systems
Authors: Vieweg W. V. R. , Alpert J. S. , Hagan A. D. 
Published: February 2007

AbstractThe origin of the sinoatrial node artery (SAN) and atrioventricular node artery (AVN) was determined for 118 patients with normal coronary arteriograms. The coronary arteriograms of the 118 patients were divided into right (66.1%), mixed (26.3%), and left (7.6%) inferior emphasis systems. The SAN arose from the right coronary artery in 53%, the left coronary artery in 35%, and had a dual origin in 11%. The proximal right coronary artery was the origin of the SAN in 48.7% of right, 60.5% of mixed, and 55.6% of left inferior emphasis systems. The left coronary artery was the origin of the SAN in 38.5% of right, 25.8% of mixed, and 44.4% of left inferior emphasis systems. The AVN arose from the right coronary artery in 84%, the left coronary artery in 8%, and from both in 8% of the 118 patients. The right coronary artery was the origin of the AVN in 98.7% of right, 74.2% of mixed, and 0% of left inferior emphasis systems. The left coronary artery was the origin of the AVN in 0% of right, 25.8% of mixed, and 100% of left inferior emphasis systems.
The Echocardiographic Diagnosis of “Concealed” Tricuspid Stenosis
Authors: Schloss Michael , Kronzon Itzhak 
Published: February 2007

AbstractA case is presented of a 42‐yr old woman with rheumatic heart disease in whom cardiac catheterization revealed severe mitral stenosis and a low cardiac output, but no gradient across the tricuspid valve. Echocardiography clearly demonstrated the presence of tricuspid stenosis and the valve was found to be severely stenotic at surgery. This establishes the value of echocardiography in detecting tricuspid stenosis and suggests that, in some cases, it may be more sensitive than cardiac catherization in detecting this lesion.
Echocardiographic findings in a patient with primary pulmonary hypertension
Authors: Lense Lloyd D. , Kronzon Itzhak , Danilowicz Delores , Schloss Michael , Singh Amarjit 
Published: February 2007

AbstractThis is a report of the echocardiographic findings in a 9‐year‐old white female with primary pulmonary arterial hypertension confirmed by catheterization and later at autopsy. The reported findings of an absent “a” wave, a flat diastolic E to F slope, and a midsystolic closure of the pulmonic valve were observed. In addition, tricuspid valve prolapse was noted. Prolapse of the tricuspid valve may be part of the mechanism of tricuspid insufficiency in a patient with pulmonary hypertension.
Comparison of left and right ventricular function in acute myocardial infarction
Authors: Russell Richard O. , Dowling John T. , Burdeshaw John , Turner Malcolm E. , Rackley Charles E. 
Published: February 2007

AbstractPulmonary arterial end‐diastolic and mean right atrial pressures were compared in 25 patients with acute myocardial infarction and in one patient with unstable angina. No consistent relationship was observed between these pressures. Simultaneous ventricular function curves relating the stroke work of each ventricle to its respective filling pressure were constructed on 34 occasions, dextran infusion or diuresis being used to alter the filling pressure. The curves from each ventricle were described mathematically by a quadratic (parabolic) function as well as by a straight line function and then compared by canonical correlation analysis. Alterations in the left ventricular function curves occurred with and without depression of right ventricular function curves. These hemodynamic measurements demonstrate that acute myocardial infarction can alter the relationship between left and right ventricular function.
The clinical and angiographic spectrum of isolated, nondominant, left circumflex coronary disease
Authors: Moskowitz Ralph M. , Kronzon Itzhak , Schloss Michael , Glassman Ephraim 
Published: February 2007

AbstractSixteen of 994 patients with arteriosclerotic heart disease and dominant right coronary arteries had isolated left circumflex obstruction. Of these, 6 patients had significant (75%) narrowing in the main circumflex, 10 in 1 of the marginal branches and 1 in the atrioventricular groove branch. Angina was mild in 5, moderate to severe in 8, and unstable in 1. Four patients had prior myocardial infarction (MI), and 1 had a recent MI complicated by posterior papillary muscle rupture. The EKG was normal in 5, showed an MI in 2, LBBB in 1, RBBB in 2, ST‐T wave changes in 3, LVH in 2, and atrial fibrillation in 2. Left ventricular angiography performed in the right anterior oblique projection revealed normal contraction in 9 patients, apical hypokinesis in 4, posterobasal hypokinesis in 1, and diffuse hypokinesis in 2. The left ventricular end diastolic pressure was normal in 11 patients and elevated in 5. The cardiac index was normal in 12 patients and reduced in 2. Isolated, nondominant, left circumflex coronary disease is an uncommon entity in symptomatic patients. However, when present, it may produce significant clinical and hemodynamic impairment.
Design for obtaining the half‐axial projection
Authors: Kato Warren , Wong Maylene 
Published: February 2007

AbstractA device for obtaining the half‐axial projection complementing single plane cine equipment is described. The design enables a single technician to raise and lower the patient's upper half of the body between 0° and 20° of longitudinal deviation from the rotating cradle, set between 0° and 70° of horizontal deviation. Materials cost less than $100 and can be assembled by personnel in most hospitals.
Incidence and age distribution of patients with myocardial infarction and normal coronary arteriograms
Authors: Thompson S. I. , Vieweg W. V. R. , Alpert J. S. , Hagan A. D. 
Published: February 2007

AbstractOver a 41 month period selective coronary arteriography was performed on all patients age 35 and under seen at our hospital with a documented myocardial infarction. In these 25 patients, 4 (16%) demonstrated no arteriographic evidence of coronary artery disease. One‐hundred and fifty‐two patients over age 35 with a documented myocardial infarction underwent selective coronary arteriography during the same period. In each of the 152 cases, obstructive coronary artery disease was demonstrated. The generally favorable prognosis of patients with myocardial infarction and normal coronary arteriograms has been previously documented. On the basis of our experience and a review of the literature, it is recommended that all patients age 35 and under sustaining a myocardial infarction should undergo selective coronary arteriography, in order to establish prognosis.
Selective cannulation of the anterior interventricular vein and coronary sinus: Potential applications
Authors: Chatterjee Kanu , Magnusson Peter , Kaushik V. S. , Swan H. J. C. 
Published: February 2007

AbstractA technique of cannulation of the anterior interventricular vein (AIV) selectively, along with selective cannulation of the coronary sinus, is described. The technique was successful in 61 of 82 patients (76%) in whom it was attempted. There were no serious complications. The technique allows one to obtain blood samples simultaneously from the anterior interventricular vein and the coronary sinus, so that the metabolism of the left ventricular anterior wall and that of the overall left ventricle can be studied. Possible clinical applications of simultaneous investigation of the left ventricular anterior wall and global myocardial metabolism are discussed.
Left ventricular endomyocardial biopsy II: The value of light microscopy
Authors: Davies Michael J. , Brooksby Iain A. B. , Jenkins B. Stephen , Cankovic‐Darracott Sally , Swanton R. Howard , Coltart D. John , Webb‐Peploe Michael M. 
Published: February 2007

AbstractHistological sections of left ventricular endomyocardial biopsies have been examined by light microscopy. The biopsies were taken from patients with congestive, hypertrophic, or restrictive cardiomyopathy and from patients with either aortic stenosis or regurgitation. In congestive cardiomyopathy no specific features were found and similar abnormalities were seen in aortic valve disease. In only one of six cases of asymmetric septal hypertrophy were the characteristic histological appearances noted. In four out of five patients with a restrictive type of cardiomyopathy, amyloid was demonstrated. The muscle fibres in aortic stenosis had a greater cross‐sectional area than those in aortic regurgitation. A greater degree of fibrosis was present in aortic stenosis than in aortic regurgitation. In aortic stenosis the amount of fibrous tissue was inversely related to function.
Knotting of a flow‐directed catheter about a cardiac structure
Authors: Meister Steven G. , Furr Charles M. , Engel Toby R. , Sones Maurice , Frankl William S. 
Published: February 2007

AbstractAn instance of knotting of a flow‐directed catheter about an intracardiac structure, presumably part of the tricuspid valve apparatus, is described. Because of the patient's severe pulmonary disease, cardiac surgery to remove the catheter was contraindicated. The central portion of the catheter was allowed to remain in situ, without apparent ill effects over a 16 month period.
Recurrent catheter‐induced coronary artery spasm
Authors: Raizner Albert E. , Ishimori Tetsuo , Chahine Robert A. 
Published: February 2007

AbstractCatheter‐induced spasm has generally been considered to represent an iatrogenic phenomenon without important clinical significance. This report describes two patients who developed catheter‐induced spasm in the proximal segment of the right coronary artery in separate studies performed in different laboratories by means of different catheter techniques. One of these patients developed right coronary spasm on three occasions and, in addition, developed catheter‐induced spasm of the left main trunk during two different studies. These observations would add support to the hypothesis that a predisposition to coronary artery spasm may exist in certain individuals. Catheter‐induced spasm deserves attention, since it may provide a means of identifying spasm‐prone individuals.
Influence of Gravity on Two‐Layer Laminar Flow in a Microchannel
Authors: Yamaguchi Y. , Honda T. , Briones M. P. , Yamashita K. , Miyazaki M. , Nakamura H. , Maeda H. 
Published: February 2007

AbstractA microchannel forms a laminar flow if the fluid velocity is sufficiently slow. It is important to clarify the effect of gravity on laminar flow, since several microsystems require side‐by‐side laminar flow, which does not possess an interfacial tension. In this work, the influence of gravity on side‐by‐side laminar flow was quantitatively investigated using a computational fluid dynamics (CFD) simulation. As a result, a dimensionless parameter related to side‐by‐side laminar flow interfacial tilting was derived. Using this parameter, it was possible to estimate the interfacial tilting angle. The results reported here will be useful for microdevice design for chemical analysis, mixing, and chemical reactions.
Droplet Formation by the Collision of Two Aqueous Solutions in a Microchannel and Application to Particle Synthesis
Authors: Sotowa K.‐I. , Irie K. , Fukumori T. , Kusakabe K. , Sugiyama S. 
Published: February 2007

AbstractA new microreactor suitable for reaction crystallization was developed. In order to prevent particles from depositing on the channel wall, the reactants were injected into a stream of immiscible fluids, so that droplets consisting of the reactants were formed. This microreactor can be used to synthesize particles without fouling. The microreactor was applied to calcium carbonate precipitation and silver particle synthesis. Fouling did not occur, even when calcium carbonate precipitation was undertaken continuously for 9 h. In the silver particle synthesis, the particles obtained showed a narrower size distribution and a smaller degree of agglomeration. The fluid dynamics in the microreactor were also investigated using a computational fluid dynamics simulation. The mixing behavior in the droplets was affected by the flow conditions of the reactants.
Porous Microfluidic Devices – Fabrication and Applications
Authors: de Jong J. , Geerken M. J. , Lammertink R. G. H. , Wessling M. 
Published: February 2007

AbstractThe major part of microfluidic devices nowadays consists of a dense material that defines the fluidic structure. A generic fabrication method enabling the production of completely porous micro devices with user‐defined channel networks is developed. The channel walls can be used as a (selective) barrier for transport. In this conceptual article the focus is on the opportunities offered by this approach. Fabrication method and applicable materials are briefly discussed. Two applications of porous micro devices are shown: a micro gas‐liquid contactor and a porous channel emulsificator that can be used to make monodispersed droplets. For both devices a short comparison with alternative concepts is drawn. Finally, key areas for the presented technology are addressed.
Micro Process Technology as a Means of Process Intensification
Authors: Becht S. , Franke R. , Geißelmann A. , Hahn H. 
Published: February 2007

AbstractDifferent implications and possible applications of the process intensification (PI) approach in the chemical industry are shown. Whereas in its pioneer days PI was defined as a pure reduction in plant size by a factor of 10–100, the PI idea has developed towards a multidisciplinary approach for process and plant. This tendency is driven by the challenges the chemicals business is facing today in terms of cost and innovation pressure. This study describes how micro process technology could provide the opportunity to realize chemical processes and plant designs faster, resulting in lower investment and operating costs. In this context, it is shown that microstructured catalytic wall reactors can boost partial oxidation processes operated in multitubular reactors by increasing chemical conversion by a factor greater than 2, though only adding 20 % of nominal capacity enhancement.
Inline Analysis in Microreaction Technology: A Suitable Tool for Process Screening and Optimization
Authors: Ferstl W. , Klahn T. , Schweikert W. , Billeb G. , Schwarzer M. , Loebbecke S. 
Published: February 2007

AbstractA procedure is described for successfully benchmarking different inline spectroscopic techniques in a microreaction plant. The objective was to identify the highest calibration precision for the real‐time quantification of the main product. Investigated methods were Raman‐, near infrared‐, and visible spectroscopy. Besides microreaction technology, the procedure comprises chemometric approaches using statistical experimental design tools and multivariate calibration methods. A calibration model was set up and validated within a defined parameter space (temperature, stoichiometry, and flow rate). The experimental basis was the investigation of toluene nitration using two different nitrating agents. The first reaction was a homogeneous nitration with pure nitric acid as the nitrating agent. It was found that Raman‐spectroscopy generates the highest precision. In the second reaction, a heterogeneous liquid‐liquid system was obtained using mixed acids. In this case, the precision is very similar for all methods with no preferences for a specific method. As well as investigating the calibration model, additional testing of the observed flow patterns was undertaken for the latter reaction, using the sensitive and very fast AOTF‐NIR‐spectroscopy.
Geschwindigkeitseinfluss bei der Gutbettbeanspruchung
Authors: Husemann K. , Mütze T. 
Published: February 2007

AbstractDie Gutbettbeanspruchung für die Feinzerkleinerung hat in der Zerkleinerungstechnik eine große wirtschaftliche Bedeutung und ist für die Zerkleinerungswissenschaft von grundsätzlichem Interesse. Da die Gutbettbeanspruchung sowohl die Merkmale einer Verdichtung als auch die der Zerkleinerung trägt, ist für ein Erfassen der in ihr vorherrschenden Mikroprozesse eine Betrachtung beider parallel ablaufender Prozesse notwendig.
Charakterisierung der Dispergiereigenschaften von keramischen nanodispersen Suspensionen mit der Ultraschallspektroskopie
Authors: Steinborn G. , Wäsche R. 
Published: February 2007

AbstractDie Dispergiereigenschaften von verschiedenen nanoskaligen Pulvern mit unterschiedlicher Kornfraktion im Bereich von 10 bis 250 nm werden in verdünnten und konzentrierten keramischen Schlickern mit der Ultraschallspektroskopie untersucht. Alle stabilen Suspensionen weisen im entsprechenden pH‐Bereich eine monomodale Partikelgrößenverteilung auf. Durch die Charakterisierung der Suspensionen mit der Ultraschallspektroskopie kann eine verbesserte Bewertung hinsichtlich Homogenität und Agglomeratbildung auch für nanoskalige Pulver erhalten werden. Dies ermöglicht eine bessere Qualitätskontrolle prozessrelevanter Schritte bei der Verarbeitung.
Taming the shadow: corporate responsibility in a Jungian context
Authors: Ketola Tarja 
Published: February 2007

AbstractRampant shadows undermine true corporate responsibility (CR) when companies try to keep up appearances by fair means or foul. This paper studies the thoughts, words and deeds of CR actors in their Jungian context. The aim is to help CR actors to understand different CR behaviour and to gain new insights into developing CR values, discourses and practices.This research builds on earlier psychological articles published in this journal, and digs deeper into the psychological resources of the human mind to show what vast potentials lie there to solve CR issues. Jungian theories open up the individual, organizational and societal personality and give opportunities to expand it horizontally and vertically. The Jungian prospective quality of the psyche is illustrated by three levels of unconscious – personal, cultural and collective, which can help the development of CR values, discourses and actions of individuals, organizations, societies and humankind. Copyright © 2007 John Wiley & Sons, Ltd and ERP Environment.
Cell‐mediated cytotoxicity against ectromelia virus‐infected target cells. I. Specificity and kinetics
Authors: Gardner I. , Bowern Narelle A. , Blanden R. V. 
Published: February 2007

AbstractSpleen cells from mice immunized intravenously with attenuated ectromelia virus were cytotoxic for target cells infected with virulent ectromelia virus in the absence of exogenous complement; cytotoxicity was measured by 51Cr release from target cells. L929 cells were the most sensitive target cells, but the effect could also be demonstrated with P‐815 mastocytoma cells and chick embryo cells; mouse embryo cells were unsatisfactory. Hyperimmune anti‐ectromelia serum and complement was not significantly cytotoxic although fluorescein‐conjugated antiserum stained virus‐infected L929 cells.Release of 51Cr label from ectromelia‐immune spleen cells (at a spleen cell: target cell ratio of 100: 1) increased in a linear manner with time, until a plateau was reached at 20–24 hours. Cytotoxicity appeared to be specific in that ectromelia‐immune spleen cells killed ectromelia‐infected L929 cells, but not uninfected L929 cells, whereas spleen cells from mice immunized with Listeria monocytogenes (a potent stimulus for cell‐mediated immunity) or from normal mice, did not kill ectromelia‐infected L929 cells. Spleen cells from mice immunized with vaccinia virus (a poxvirus closely related to ectromelia) were cytotoxic for ectromelia‐infected L929 cells.Spleen cells from mice immunized with ectromelia virus had acquired cytotoxic activity by 2 days after immunization. Cytotoxic potency reached a peak at 6 days and had declined to a low level by day 10. The potential significance of the phenomenon in relation to control of viral infection is discussed.