bluuebunny/crossref_metadata_2025_split huggingface dataset:
Damage to the collateral circulation by ptca of an occluded coronary artery
Authors: Pijls Nico H. J. , Bracke Frank A. L. E. 
Published: March 2007

AbstractIn this report, a patient is described with an occluded left circumflex artery, in whom the corresponding myocardium was protected at rest by sufficient collateral circulation. Because of angina pectoris class III, a PTCA of that occluded vessel was performed, complicated by a large dissection. Recruitable collateral flow, assessed from pressure calculations by a new technique, suddenly decreased at the very moment of dissection. This was accompanied by resting pain and ischemia on the ECG. This case report confirms the hypothesis that the collateral circulation can be damaged by PTCA and emphasizes that every PTCA implies a definite risk, even in case of an occluded coronary artery filled by collaterals.
Reduction of femoral arterial bleeding post catheterization using percutaneous application of fibrin sealant
Authors: Ismail Suad , Combs Matthew J. , Goodman Norman C. , Teotia Sumeet S. , Teates Charles D. , Abbott Robert D. , Fechner Robert E. , Nolan Stanton P. , Powers Eric R. , Spotnitz William D. 
Published: March 2007

AbstractThe number of cardiac catheterizations performed yearly is growing with correspondingly increasing amounts of morbidity, complications, and hospital costs. This study suggests that fibrin sealant instillation via an arterial sheath at the completion of femoral catheterization may improve hemostasis. Results using fibrin sealant in 12 unheparinized dogs documented significant reductions (McNemar's exact test) versus control for groin ecchymoses (1 versus 8,P= .008) and radiolabeled hematoma formation (0 versus 7,P= .016). Also swelling was less in the fibrin sealant treated groins when compared to control groins (1 versus 6,P= .125), but failed to reach statistical significance. Results in eight heparinized dogs (activated clotting time 374 ± 22, mean ± SEM) revealed a statistically significant reduction in signs of gross bleeding in the fibrin sealant‐treated groins (1 versus 8,P= .016). This method may contribute to reduced morbidity, complications, and length of hospitalization. It may also allow for earlier patient mobilization after cardiac catheterization.
Coronary stenting without anticoagulation
Authors: Mehan Vivek K. , Salzmann Christian , Kaufmann Urs , Meier Bernhard 
Published: March 2007

AbstractStents are useful bail‐out devices in coronary angioplasty. They are also used electively for situations associated with poor angioplasty results (e.g., restenotic lesions, venous grafts) and may reduce restenosis rates. However, the significant incidence of stent thrombosis necessitated aggressive anticoagulation with associated hemorrhagic complications. This remains a major limitation of stenting. We present our experience of stenting with half (disarticulated) Palmaz‐Schatz coronary stents in eight consecutive patients, managed with aspirin alone. No patient experienced acute or subacute stent thrombosis.
Coronary artery stenting for acute closure complicating primary angioplasty for acute myocardial infarction
Authors: Walton Antony S. , Oesterle Stephen N. , Yeung Alan C. 
Published: March 2007

AbstractWe report a case of progressive right coronary artery dissection complicating direct angioplasty for an acute inferior myocardial infarct, with successful bail‐out stenting of the affected vessel.
Retrieval of occluding unexpanded palmaz‐schatz stent from a saphenous aorto‐coronary vein graft
Authors: Rozenman Yoseph , Burstein Moshe , Hasin Yonathan , Gotsman Mervyn S. 
Published: March 2007

AbstractThe Palmaz‐Schatz coronary stent is used frequently to reduce the rate of restenosis of balloon angioplasty in saphenous vein grafts. In many European centers, the stent, manually crimped on a balloon, is advanced across the stenosis without a protective sheath. This report describes a patient in whom an attempt to deploy a stent in the orifice of a saphenous vein graft was complicated by dislodgement of the unexpanded stent from the balloon. The unexpanded stent caused immediate occlusion of the vein graft and severe ischemic symptoms. The stent was retrieved by inflation of another balloon in the graft, distal to the stent, pulling the balloon toward the guiding catheter, and then withdrawing the whole system.
Successful transcatheter management of palmaz stent embolization after superior vena cava stenting
Authors: Bartorelli Antonio L. , Fabbiocchi Franco , Montorsi Piero , Loaldi Alessandro , Tamborini Gloria , Sganzerla Paolo 
Published: March 2007

AbstractA 34‐year‐old patient with benign superior vena cava syndrome (SVCS) was treated with thrombolytic therapy, balloon angioplasty, and placement of two peripheral Palmaz stents. Embolization of one stent to the right atrium occurred 10 min after successful implantation. This serious complication was successfully managed by percutaneous transcatheter technique with retrieval from the right atrium and subsequent deployment into the right external iliac vein of the lost stent. Complete resolution of SVCS symptoms occurred within 24 hr and moderate superior vena cava restenosis was successfully dilated 8 months later. At 12‐month follow‐up the patient continues to be asymptomatic.
Alterations in reference vessel diameter following intracoronary stent implantation: Important consequences for restenosis based on percent diameter stenosis
Authors: Foley J. Brendan 
Published: March 2007

AbstractThe scaffolding effect of stent implantation has the potential to alter vascular geometry and dimensions. The objective of this study was to determine the impact of intracoronary stent implantation on the reference vessel diameter and the consequences of this on the frequency of restenosis applying the binary definitions of restenosis based on percent diameter stenosis. Routine angiographic follow‐up was performed in 79/80 consecutive patients who had a single elective Palmaz‐Schatz stent implanted in denovo lesions in native coronary arteries 6.5±3.4 mo after the index procedure. Complete quantitative angiographic follow‐up was available in 78 (98%). The mean reference vessel diameter was 2.9±0.6 mm preprocedure, increased to 3.1±0.5 mm immediately poststent implantation and was 2.6±0.6 mm at follow‐up (F = 6.45, P = 0.0001, ANOVA for repeated measures). In view of the varying reference vessel diameter, percent diameter stenosis postangioplasty and at follow‐up was determined by two methods: (1) automatically by the quantitative coronary angiographic analysis system and (2) by expressing the minimal luminal diameter postangioplasty and at follow‐up as a function of the original preprocedural reference vessel diameter. The restenosis rate was significantly greater for all definitions of restenosis when the minimal luminal diameter was determined as a function of the original preprocedure reference vessel diameter (e.g., 34% vs. 18% for the ⩾50% criterion, P = 0.018). Stent implantation results in alterations in reference vessel diameter, which have important consequences for the frequency of restenosis presented as a binary variable based on percent diameter stenosis. © 1995 Wiley‐Liss, Inc.
Transcatheter closure of an aortopulmonary window with a modified double umbrella occluder system
Authors: Stamato Theresa , Benson Lee N. , Smallhorn Jeffrey F. , Freedom Robert M. 
Published: March 2007

AbstractTranscatheter occlusion of a small aortopulmonary window was successfully performed in a child using a double umbrella occluding device. The delivery system was adapted for use through a small sheath from a transvenous approach. Transcatheter closure is feasible in appropriately selected aortopulmonary windows. © 1995 Wiley‐Liss, Inc.
High balloon dilatation pressures in percutaneous transluminal coronary angioplasty are not associated with higher rate of significant complications
Authors: Ebersole Douglas G. , Rubal Bernard J. 
Published: March 2007

AbstractTo examine the results of high balloon dilatation pressures during percutaneous transluminal coronary angioplasty (PTCA), we retrospectively reviewed 482 angioplasty cases from our institution and divided them into three groups by the peak inflation pressure used during the procedure. Group one was defined by inflation pressures of 1–6 atmospheres (atm), group two by 7–12 atm, and group three by 13–20 atm. There were 166 patients in group 1 (34.4%), 235 in group 2 (48.8%), and 81 (16.8%) in group 3. The success rates were not statistically different; 90% in group 1, 96% in group 2, and 95% in group 3. Large dissections occurred in 27 patients in group 1 (16.3%), 19 in group 2 (8.1%), and 4 (4.9%) in group 3 (P > 0.006). There were no differences in the rates of death (1.2% vs. 0.9% vs. 1.2%), myocardial infarction (3.0% vs. 1.3% vs. 3.7%), or in‐hospital CABG (3.0% vs. 1.7% vs. 1.2%) in groups 1, 2, and 3, respectively. Six‐mo target vessel revascularization rates also were not different: 19% vs. 13% vs. 18%. In summary, selectively using high balloon pressures during PTCA does not result in increased complications. © 1995 Wiley‐Liss, Inc.This article is a US Government work and, as such, is in the public domain in the United States of America.
Subintimal wire position during angioplasty of a chronic total coronary occlusion: Detection and subsequent procedural guidance by intravascular ultrasound
Authors: Kimura Bruce J. , Tsimikas Sotorios , Bhargava Valmik , Demaria Anthony N. , Penny William F. 
Published: March 2007

AbstractWe report a case of intravascular ultrasound (IVUS) imaging of a chronic total coronary artery occlusion angioplasty initially complicated by subintimal wire penetration. IVUS provided unique images of wire position and a “double‐barrel” lumen that complemented angiographic data in initial diagnosis and in subsequent guidance of the procedure. © 1995 Wiley‐Liss, Inc.
Cost comparison between two modes of palmaz schatz coronary stent implantation: Transradial bare stent technique vs. transfemoral sheath‐protected stent technique
Authors: Kiemeneij Ferdinand , Hofland Jan , Laarman Gert Jan , van der Elst Daniëlle Hupkens , Lubbe Harry Van Der 
Published: March 2007

AbstractCoronary Palmaz Schatz stent implantation is usually performed by using the sheath protected stent delivery system (SDS) via the percutaneous transfemoral route. However, downsizing of PTCA equipment made transradial coronary stenting feasible. Bare stent implantation, 6F technique, increased patient mobility, reduced vascular complications and reduced hospital stay may increase cost effectiveness of this novel technique.Two well‐documented patient groups selected for elective single vessel and single lesion Palmaz Schatz stent implantation were retrospectively compared. Group A (transradial stenting; n = 35) was compared to Group B (transfemoral stenting; n = 25) derived from the Benestent population, included in our hospital. A comparison was made for three areas of interest: (1) procedural consumption of material (the number of guiding catheters, guidewires, balloon catheters and stents), (2) postprocedural need for diagnostic and therapeutic procedures for stent‐related complications, and (3) duration of hospital stay. Differences between these subjects in Group A and B were translated to hospital costs.Although more guiding catheters were used in group A (1.69 ± 0.87 vs. 1.08 ± 0.28; P=0.001), the use of the SDS contributed importantly to higher material costs in group B (cost reduction in group A; 13%). Less patients in group A required diagnostic (2 vs. 7; P=0.027) and therapeutic (0 vs. 5; P=0.01) procedures for bleeding complications (cost reduction; 93%). Hospitalization in Group A was shorter (6.4 ± 4.7 vs. 11.6 ± 9.9 days; P=0.005), caused by early and safe mobilization, less vascular complications, and preprocedural adjustment on coumadin (cost reduction; 45%). Overall, the mean cost per patient in group A was 67% of these costs in group B.Significant savings were realized with the transradial bare stent technique, by reduction of costs for angioplasty material, diagnostic and therapeutic procedures for stentrelated complications and hospital stay. © 1995 Wiley‐Liss, Inc.
Assessment of collateral flow during balloon coronary occlusion by intracoronary blood flow velocity analysis
Authors: Piek Jan J. , Koch Karel T. H. , van Liebergen Rob , Peters Ron J. G. , David George K. 
Published: March 2007

AbstractCoronary blood flow velocity analysis of the contralateral and of the ipsilateral artery can be used to assess collateral flow during controlled balloon coronary occlusion. Coronary blood flow velocity assessment in combination with measurement of aortic pressure and coronary wedge pressure permits expression of the development of the collateral circulation in terms of flow and resistance. The application of both techniques is illustated in two patients. © 1995 Wiley‐LIss, Inc.
Responses of systemic and pulmonary veins to the presence of an intravascular stent in a swine model
Authors: Hosking Martin , Redmond Mary , Allen Lila , Broecker Lother , Keaney Marilyn , Lebeau Julie , Walley Virginia 
Published: March 2007

AbstractThe outcome of stent implantion for children with pulmonary venous obstruction has been characterized by late reocclusion associated with a marked vessel neointimal proliferation. The purpose of this study was to compare the responses of the systemic vein and pulmonary vein to the presence of an intravascular stent, using a Yorkshire swine (N = 10) model. Under cardiopulmonary bypass, a single Palmaz stent was placed in the inferior vena cava (IVC) and right lower pulmonary vein (PV) with sacrifice at 4.9–6.1 months. Angiography and hemodynamic data were determined at 1 and 3 months post‐stent implant and prior to euthanasia. All stents were found to be patent, with no difference in degree of thrombosis or neointimal formation. No statistical difference was found in the initial and final stent diameter for both inferior vena cava and pulmonary vein stents (PV initial 6.8±0.9; final 7.1±0.6) (IVC initial 10.4±1.2; final 10.4±1.2). Electron microscopy demonstrated smooth endothelialization of both pulmonary and systemic venous stent devices. No thrombosis was found on gross morphology. The data indicate that there is no intrinsic difference in the response of the pulmonary vein to the presence of a stent device. The clinical experience of restenosis following stent implantation for pulmonary vein stenosis appears to be more related to variables of final stent diameter combined with the marked intrinsic abnormal vessel architecture, as seen with this condition. © 1995 Wiley‐Liss, Inc.
Critical role of pulmonary angiography in the diagnosis of pulmonary emboli following cardiac surgery
Authors: Ramos Roque S. , Salem Bakr I. , Haikal Maged , Gowda Siddhesh , Coordes Cordie , Leidenfrost Ronald 
Published: March 2007

AbstractThis study was conducted to identify patients at high risk of the development of Pulmonary Embolism (PE) after open heart surgery, to evaluate pertinent diagnostic methods, and to assess the mortality associated with this complication. We evaluated the records of 2,551 consecutive patients who underwent open heart surgery over a 10‐year period to identify those patients in whom PE developed. All surgical reports, ventilation/perfusion scans, pulmonary angiograms, and autopsies from the same period were also reviewed. Preoperative and postoperative risk factors for pulmonary embolism were also analyzed, as well as the outcome of this complication in each type of surgical procedure.Pulmonary embolism was identified in 69 (2.7%) patients after open heart surgery, in 43 (62.3%) of whom the diagnosis was established within the first week of surgery. Factors associated with high incidence for PE were hyperlipidemia, congestive heart failure and heparin‐induced thrombocytopenia (P <0.001); obesity and prolonged mechanical ventilation (P <0.005); and prior right heart catheterization by the femoral approach and prior PE and/or deep vein thrombosis (P <0.05). The diagnosis of PE was established by a high‐probability ventilation/perfusion scan in 25 patients, by pulmonary angiography in 42 (29 of whom had prior V/Q scan read as intermediate or low probability for PE) and by autopsy in two patients. The mortality rate in patients who had PE was 7.2%, while in those without this complication it was 3.2%.These findings suggest that aggressive approach for the diagnosis of PE by pulmonary angiography whenever the V/Q scan is not read as high probability is crucial in patients with recent open heart surgery; such approach may identify patients with PE at an early stage and may have an impact in reducing mortality incurred by this complication. This diagnostic assessment should be emphasized in the perioperative period, especially in patients with multiple significant and identifiable risk factors for PE. © 1995 Wiley‐Liss, Inc.
Perforation of a side branch of the right coronary artery during selective coronary angiography using 5 french judkins catheters
Authors: Schöbel Wolfgang Andreas , Voelker Wolfram , Karsch Karl Rüdiger 
Published: March 2007

AbstractIn this case report the first known case of a perforation of a side branch of the right coronary artery during diagnostic coronary angiography using 5 French Judkins catheters is described which occurred by selective intubation. Although catheter placement was controlled by contrast test injection the catheter occasionally intubated the conus artery superselectively just prior to the diagnostic injection. Thus, perforation of small side branches may be encountered especially by the use of 5 French Judkins catheters. © 1995 Wiley‐Liss, Inc.
Intracoronary stenting of a coronary occlusion resulting from an aortic dissection
Authors: Ikari Yuji , Hara Kazuhiro , Tamura Tsutomu , Hara Hidehiko , Saeki Fumihiko , Kikawa Ikutarou , Wanibuchi Yasuhiko , Yamaguchi Tetsu 
Published: March 2007

AbstractAcute myocardial infarction secondary to aortic dissection may occur due to compression of the coronary arteries by a hematoma or extension of the dissection into the coronary arterial wall. We report a patient with this condition who was successfully treated by Palmaz‐Schatz stenting, providing an alternative to thrombolysis or angioplasty. © 1995 Wiley‐Liss, Inc.
Mitral dilatation with the multi‐track system: An alternative approach
Authors: Bonhoeffer Philipp , Piéchaud Jean‐Francois , Sidi Daniel , Yonga Gerald , Jowi Christine , Joshi Mark , Mugo Michael , Kachaner Jean , Parenzan Lucio 
Published: March 2007

AbstractWe developed a simple and versatile new technique (Multi‐Track) for percutaneous mitral valvotomy using two separate balloon catheters positioned on a single guidewire. The first catheter, with only a distal guidewire lumen and a proximal balloon, is introduced over the guidewire into the vein and then advanced into the mitral valve orifice. Subsequently, a normal balloon catheter running on the same guidewire is inserted and lined up with the first catheter so the two are positioned side by side. The balloons are then inflated simultaneously.The technique was applied in 12 patients between 10 and 44 years of age (mean, 27.1) and weighing 24–80 kg (mean, 50.3). Valve area increased from 0.66 cm2 (range, 0.3–0.9 cm2) to 1.97 cm2 (range, 1.3–3.1 cm2) and mean left atrial pressure dropped from 31 mmHg (range, 18–52 mmHg) to 12 mmHg (range, 5–22 mmHg).Mitral dilatation with the Multi‐Track system gives results comparable to those with previously described techniques and uses simpler and less costly catheters. © 1995 Wiley‐Liss, Inc.
Transcatheter closure of large atrial septal defects with the babic system
Authors: Sievert Horst , Babic Uros U. , Ensslen Roland , Scherer Detlef , Spies Hans , Wiederspahn Thomas , Zeplin Harald E. 
Published: March 2007

AbstractAn improved 10 Fr version of the atrial septal defect (ASD) occlusion system consisting of two umbrellas for transvenous introduction over the long veno‐arterial guide‐wire was used to attempt closure in five adult patients with large defects (26–35 mm). The umbrellas are made of nitinol wire frame and a thin membrane of microporous polyurethane. Supported by the metal cannula and guided by selective left atriography, the umbrellas of 45–60 mm were placed individually into the atria and screwed together at the septum level by means of a torquer catheter. Positioning and screwing on, unscrewing, separating, and repositioning the umbrellas up to 17 times were needed to anchor the prosthesis correctly in a patient. The prosthesis could be implanted primarily in all patients (in one at second session). Dislodgement of a 60 mm prosthesis and left atrial perforation with a 55 mm prosthesis required surgery in two patients 8 hours and 2 weeks post procedure, respectively. A single umbrella‐arm fracture was noticed in one patient 4 months after the implantation. All five patients were free of symptoms at follow‐up after 7–10 months. Transcatheter closure of large ASDs is technically feasible with this system. The morbidity is mainly associated with the implantation of very large umbrellas. © 1995 Wiley‐Liss, Inc.
Orthodeoxia‐platypnea due to intracardiac shunting relief with transcatheter double umbrella closure
Authors: Landzberg Michael J. , Sloss Laurence J. , Faherty Chris E. , Morrison Brian J. , Bittl John A. , Bridges Nancy D. , Casale Paul N. , Keane John F. , Lock James E. 
Published: March 2007

AbstractThe safety and efficacy of transcatheter clamshell occlusion of patent foramen ovale for relief of severe arterial desaturation and dyspnea in the upright position due to intracardiac shunting were examined in eight patients with excessive risk of surgical patent foramen ovale closure. All patients had successful reduction of intracardiac shunting with an immediate rise in oxygen saturation −95% by implantation of a clamshell device on the atrial septum. Despite two early incidents of device embolization, retrieval and immediate re‐implantation, and one patient with nonsustained atrial and ventricular arrhythmias, there were no adverse clinical sequelae. In follow‐up evaluation transcatheter clamshell closure of patent foramen ovale has provided persistent relief from shuntrelated arterial desaturation and symptomatology in all living patients. © 1995 Wiley‐Liss, Inc.
Use of RDCs in rigid organic compounds and some practical considerations concerning alignment media
Authors: Thiele Christina M. 
Published: March 2007

AbstractA molecule that is introduced into a liquid crystal or alignment medium forfeits its isotropic tumbling motion. The resulting partial alignment leads to observable anisotropic interactions, dipolar couplings being one. To control the degree of alignment that the molecule experiences is essential to retain the quality of high‐resolution solution‐state spectra. An overview of alignment media is given. The problems associated with very large residual dipolar couplings (RDCs) are pointed out, and means to reduce residual dipolar couplings (RDCs) for strychnine in substituted polyglutamate liquid crystals are described. The use of RDCs for the assignment of diastereotopic protons and for the determination of the relative configuration in rigid compounds is then described in detail, also pointing out some pitfalls. © 2007 Wiley Periodicals, Inc. Concepts Magn Reson Part A 30A: 65–80, 2007.