bluuebunny/crossref_metadata_2025_split huggingface dataset:
Variations in acoustical beam properties of intracoronary doppler catheters
Authors: Roth Thomas , Erbel Raimund , Brennecke RÜDiger , Rupprecht Hans JÜRgen , Meyer JÜRgen , Seelen Werner V. 
Published: March 2007

AbstractThe limitations of coronary angiography in assessing the functional significance of coronary obstructions is well known. While the critical variable of coronary blood flow cannot be readily measured, intraluminal Doppler sonography offers useful related functional information on blood flow velocity. In order to fully evaluate Doppler signals it is essential to have exact knowledge of the transducer transmission characteristics and of the ultrasound beam topology. In an experimental set‐up, the transmitter‐receiver characteristics of five commonly used Doppler catheters were investigated. In comparing the beam characteristics we found inhomogeneities in the lateral beam spread. At a penetration depth of 3.0 mm the beam shape varied from a minimum of 1.25 mm up to a maximum of 3.5 mm. The mean was 2.25 mm. The different beam profiles of the investigated Doppler transducers cause an error in measuring the blood flow velocity. The blood flow velocity tends to be underestimated the more the vessel diameter and the blood flow velocity increase. Contrary to transducer design optimized for imaging, for spectral analysis of the Doppler signal it would be advantageous to have as broad a beam as possible in order to illuminate the entire vessel lumen © 1993 Wlley‐Liss, Inc
Collagen plug hemostatic closure of femoral arterial puncture sites following implantation of intracoronary stents
Authors: Webb John G. , Carere Ronald A. , Dodek Arthur A. 
Published: March 2007

AbstractRecently a new adjunct to achieving arterial hemostasis has been developed. The device consists of a purified bovine collagen plug which when inserted adjacent to the arterial wall induces the formation of a hemostatic cap directly over the arterial puncture. We have utilized collagen plug hemostasis in 32 patients on 35 occasions undergoing implantation of intracoronary stents while attempting to maintain continuous full anticoagulation. Initial hemostasis was successfully achieved in all patients. Moderate sized (5 to 10 cm) hematomas were noted in 4 patients and large hematomas (>10 cm) in 3, of whom 2 required vascular repair and transfusion. One patient developed a purulent discharge from the puncture site which resolved with a brief course of antibiotics. No patient suffered femoral arterial occlusion, distal embolization, or venous thrombosis. There were no long term access site problems at a mean follow up of 6 months. Repeat catheterization utilizing the same femoral artery was performed in 16 patients without difficulty. In five of these patients angiography was performed early after stent implantation without discontinuation of full anticoagulation and collagen closure was utilized a second time. Collagen plug hemostasis is feasible after coronary stenting, may allow more aggressive anticoagulation than might otherwise be achieved, and may facilitate angiographic restudy early after stenting without the need to discontinue anticoagulation.© 1993 Wlley‐Liss, Inc
Use of the porous balloon in porcine coronary arteries: rationale for low pressure and volume delivery
Authors: Santoian Edward C. , Gravanis Michael B. , Schneider Joel E. , Tarazona Norman , Cipolla Gustavo D. , Robinson Keith A. , King Spencer B. 
Published: March 2007

AbstractUsing agents administered systemically, attempts to control the restenotic myoproliferative response associated with angioplasty have been unsuccessful. The porous balloon has the advantage of achieving high local concentrations by directly infusing agents into the arterial wall. The purpose of this study is to identify any acute and chronic morphological changes in swine coronary arteries infused with normal saline through the porous balloon at different driving pressures. In order to establish the safety of local arterial wall infusion through the porous balloon, swine underwent porous balloon infusion of 3,6, or 10 ml of saline at 5 atmospheres, or infusion of 3 ml of normal saline delivered at either 2, 5, or 10 atmospheres of pressure into the normal left anterior descending and left circumflex arteries. To assess the histopathologic alterations induced by the porous balloon, sized 1.1 to 1 with respect to the artery, animals were sacrificed either immediately after porous balloon infusion or 14 days later. Acute vessels were evaluated for the presence of medial injury, disruption and/or dissection, whereas chronic vessels underwent morphometric analysis measuring the residual luminal area (Lumen area/Intimal area + Lumen area) and the maximal intimal thickness. Adequate adventitial penetration was confirmed by infusing as little as 2–3 ml of methylene blue at 2 atmospheres of pressure. Infusion of 3 ml of normal saline at 2 atmospheres resulted in minor focal medial edema and disorganization, detected both acutely and 14 days after porous balloon infusion. At delivery pressures of 5 or 10 atmospheres, proportionally more acute injury was noted and measurable neointimal lesions were observed 2 weeks after infusion. These data indicate that porous balloon infusion of 3 ml of normal saline at 2 atmospheres was safe and resulted in only minimal medial edema of normal swine coronary arteries. Higher pressure or volume delivery proportionally increased the degree of injury and contributed to the development of neointima.© 1993 Wlley‐Liss, Inc
Mobile cardiac catheterization registry: Report of the first 1,001 patients
Authors: Bersin Robert M. , Elliott Charles M. , Elliott Allison V. , Fedor John M. , Gallagher John J. , Jordan Lisa , Simonton Charles A. , Svenson Robert H. , Wilson B. Hadley , Zimmern Samuel H. 
Published: March 2007

AbstractThe purpose of this study was to evaulate prospectively the efficacy and safety of mobile cardiac catheterization. Mobile cardiac catheterization was introduced into clinical practice in 1989, but there has been no systematic study of its performance and safety. A registry was established in 1989 to monitor outcomes with mobile cardiac catheterization and is reported here.Patients were screened for eligibility for mobile cardiac catheterization using the joint AHA/ACC criteria for outpatient angiography. Eligible patients underwent mobile catheterization at eight hospitals within 120 miles of the base tertiary center. Helicopter evacuation services were available at each mobile site. The indications, findings, dispositions, and complications of mobile cardiac catheterization were recorded by means of a checklist, telephone follow‐up and chart review.A total of 1,001 consecutive patients were entered into the registry in the first 20 months of operation, including 436 females and 565 males aged 22 to 84 years. Angina (Canadian Classes II–IV) was the most frequent primary indication for catheterization (46.4%), followed by atypical chest pain (36.9%), or a positive exercise stress test (25.6%). Infrequent indications for catheterization included a history of myocardial infarction (5.6%), congestive heart failure (7.1%), arrhythmias (4.1%), and valvular heart disease (0.7%). Catheterization was accomplished in 99.9% of patients. Angiographically normal studies were observed in 22.8%, and mild (≤50%) coronary artery disease in 13.6% of patients. Significant one, two, and three vessel coronary artery disease was observed in 19.7, 16.0, and 18.0% respectively, and left mainstem disease was seen in 4.7% of patients. Only 27% required further referral to a tertiary site for additional diagnostic procedures, interventions, or surgery. Urgent referral for clinical instability was necessary in 0.9%, and major complications occurred in only 0.6% of patients. There were no deaths.When the joint AHA/ACC screening criteria for outpatient catheterization are used, a low risk population of patients can be appropriately identified for mobile cardiac catheterization. Mobile catheterization can be accomplished with a high procedural success rate and few complications. Most patients do not need further referral to a tertiary site for additional procedures. Mobile cardiac catheterization thus appears to be a safe and effective means of diagnostic angiography.
Creation and healing of severe coronary dissection by the use of oversized balloon for the treatment of restenosis after an initially successful angioplasty
Authors: Rozenman Yoseph , Gilon Dan , Nassar Hisham , Gotsman Mervyn S. 
Published: March 2007

AbstractWe describe two patients who underwent successful coronary angioplasty with a balloon that matched the normal size of the artery. Both patients returned for a second angioplasty because of restenosis. The morphology of the restenotic lesion was very similar to that of the original lesion. In the second angioplasty a larger balloon was used, and in both cases severe dissection occurred. Repeat angiography 3 months later demonstrated an open artery with clinically insignificant residual stenosis. We believe that in these two cases the initial angioplasty stretched the artery and it recoiled slowly to its original dimensions. A larger balloon size was necessary to crack atherosclerotic plaque and cause a successful long‐term outcome.
Unusual tear in inoue balloon during percutaneous balloon mitral valvuloplasty in a patient with calcific mitral stenosis
Authors: Kerkar Prafulla G. , Vora Amit M. , Sethi Jagmeet P. , Kale Purushottam A. , Dalvi Bharat V. 
Published: March 2007

AbstractAn unusual tear in an Inoue balloon during dilatation of calcific mitral stenosis is presented and its mechanisms discussed. An abnormal sequence of inflation indicates a possible tear.
Intracerebral hemorrhage complicating urokinase infusion into an occluded aortocoronary bypass graft
Authors: Taylor Marc A. , Santoian Edward C. , Aji Janah , Eldredge W. Jay , Cha Se Do , Dennis Charles A. 
Published: March 2007

AbstractSelective infusion of urokinase into occluded coronary bypass vein grafts is effective in restoring patency. We report the occurrence of intracerebral hemorrhage complicating an intra‐graft urokinase infusion protocol. The patient had known cerebral vascular structural pathology without recent clinical complications. Caution with the use of thrombolysis in this setting is suggested.
Influence of intraballoon pressure on development of severe mitral regurgitation after percutaneous transvenous mitral commissurotomy
Authors: Yamabe Takashi , Nagata Seiki , Ishikura Fuminobu , Md Kohji Kimura , Miyatake Kunio 
Published: March 2007

AbstractTo evaluate the influence of intra‐balloon pressure on the development of severe mitral regurgitation (≥grade 3 + ), we measured intraballoon pressure during percutaneous transvenous mitral commissurotomy (PTMC) in 62 patients using the Inoue balloon catheter. The peak intraballoon pressure was 2.29 ± 0.55 kg/cm2. Severe mitral regurgitation as a result of leaflet tear occurred in 7 patients (11%). Patients were divided into two groups those with (n = 7) and those without (n = 55) severe mitral regurgitation. Intraballoon pressure had been significantly higher in those with vs. those without severe mitral regurgitation (2.76 ± 0.31 kg/cm2 vs. 2.23 ± 0.55 kg/cm2, P < 0.01). Multiple logistic regression analysis revealed that the occurrence of severe mitral regurgitation was related to only the peak intraballoon pressure. These data suggest that a high intraballoon pressure is a risk factor for severe mitral regurgitation as a result of leaflet tear.
Multicystic aneurysmal dilatation of bilateral coronary artery fistula
Authors: Takahashi Masafumi , Sekiguchi Hiromichi , Fujikawa Hideyuki , Mito Hideaki , Eto Masato , Hojo Yukihiro , Chiba Yoshizo , Kitamura Satoshi , Shimada Kazuyuki 
Published: March 2007

AbstractBilateral coronary artery fistula constitutes an uncommon subgroup of coronary artery fistulas that may have a distinct embryologic origin. Coronary artery fistulas usually show a tortuous arrangement upon coronary angiography, but aneurysmal dilatation is rare. We report here an extremely rare case of coronary artery fistula originating from both coronary arteries, which showed multicystic aneurysmal dilatation.
Transcatheter embolization of an internal mammary artery bypass graft sidebranch causing coronary steal syndrome
Authors: Ayres Richard W. , Lu Chien‐Tai , Benzuly Keith H. , Hill Gregory A. , Rossen James D. 
Published: March 2007

AbstractWe describe a 66‐yr‐old man with angina after internal mammary artery‐coronary bypass grafting due to coronary artery steal by a sidebranch of the mammary artery. Myocardial ischemia was successfully treated by transcatheter embolization of the sidebranch.
Contrast‐induced nephrotoxicity in patients undergoing cardiac catheterization
Authors: Tommaso Carl L. 
Published: March 2007

AbstractContrast‐induced nephrotoxicity (CIN) is a common concern among angiographers. The causes of CIN are not well understood and the identification and preparation of patients at risk are important. This report reviews the literature concerning the causes and identification of patients at risk and documents the studies that are available to improve the safety of cardiac catheterization and cardiac interventions by reducing the risk of CIN.
New guiding catheter configuration for aortocoronary vein graft angioplasty
Authors: Warren Stafford G. 
Published: March 2007

AbstractA new family of four guiding catheters (8 French and 9 French) has been developed for angioplasty of aortocoronary vein grafts and native coronary arteries beyond vein graft insertions. In 67 consecutive grafts and native vessels dilated through the grafts in 54 patients, the procedural success rate was 97%. The G‐1 standard catheter was employed for the majority of the procedures (66%), but the G‐3 catheter was better for high anterior grafts and the G‐4 catheter was better for high left grafts. The G‐2 catheter was better for lower right grafts, especially in dilated aortas. Balloon angioplasty alone using 8 French catheters was performed in 60 procedures, and excimer laser with adjunctive balloon angioplasty using 9 French catheters was performed in 7 procedures.These unique guiding catheters provide an attractive alternative to existing vein graft guides by their improved seating and backup support. They may be the primary choice for vein graft angioplasty and may have future application in stent deployment and transluminal extraction catheter (TEC) atherectomy.
High incidence of renal artery stenosis in patients with coronary artery disease
Authors: Jean William J. , Al‐Bitar Issam , Zwicke Dianne L. , Port Steven C. , Schmidt Donald H. , Bajwa Tanvir K. 
Published: March 2007

AbstractThe incidence of renal artery stenosis (RAS) in patients with coronary artery disease (CAD) has not been well documented. Over a 9‐month period, 196 patients who underwent coronary angiography because of clinically suspected CAD had routine nonselective renal cine or digital subtraction angiography. There were 68 females and 128 males with a mean age of 63 years (range 35–85). Angiographically significant CAD was present in 152 patients (78%). Of the total patient cohort, 29 patients (15%) had mild RAS (<50%), and 36 patients (18%) had significant RAS (≥50%). In patients with normal coronary arteries, only three patients (7%) had RAS. Thirty‐three patients (92%) with severe RAS also had CAD. Of these 33 patients, 45% had hypertension, 30% had hyperlipidemia, 24% had diabetes mellitus, 24% had renal insufficiency (creatinine ≥1.5), and 51% were smokers. In addition, it was noted that 20 of these patients (61%) had two or more of the above‐listed clinical parameters. However, univariate analysis using the chi‐square test revealed that only CAD (22% P<0.03) and renal insufficiency (29%P<0.15) were reliable clinical predictors of RAS.In conclusion, RAS is a frequent finding in patients with CAD, particularly when renal insufficiency is also present. © 1994 Wiley‐Liss, Inc.
Use of the left internal jugular vein approach in endomyocardial biopsy
Authors: Hauptman Paul J. , Selwyn Andrew P. , Cooper Christopher J. 
Published: March 2007

AbstractEndomyocardial biopsy is conventionally performed by accessing the right internal jugular vein. The alternative approach is via the femoral veins. We describe the safe and effective use of the left internal jugular vein with a standard Caves‐Schulz bioptome. © 1994 Wiley‐Liss,Inc..
Myocardial perforation in the cardiac catheterization laboratory: incidence, presentation, diagnosis, and management
Authors: Friedrich Steven P. , Berman Aaron D. , Baim Donald S. , Diver Daniel J. 
Published: March 2007

AbstractThe introduction of balloon valvuloplasty and new devices for coronary intervention has increased the incidence and changed the site and clinical presentation of cardiac perforation. We reviewed all cases of cardiac perforation that occurred during 11,845 consecutive catheterization procedures during a 6‐yr period (1986–91). Fourteen cardiac perforations (overall incidence 0.12%) occurred as a result of the following procedures: mitral valvuloplasty 7 of 150 (4.7%), aortic valvuloplasty 4 of 260 (1.5%), pericardiocentesis 1 of 90 (1.1%), temporary pacer 1 of 1,660 (0.06%), and diagnostic left heart catheterization 1 of 6,965 (0.01%). Perforation was recognized in the catheterization laboratory in 11 patients, within 1 hr of leaving the laboratory in two patients, and 15 hr later in one patient. Hemodynamic evidence of tamponade developed in 13 patients and was confirmed by fluoroscopy (immobile heart borders) or echocardiography. Pericardiocentesis is definitive therapy in nearly half of the cases; the remaining patients require pericardiocentesis plus surgical repair of the perforation. © 1994 Wiley‐Liss,Inc..
Recoil following wiktor stent implantation for restenotic lesions of coronary arteries
Authors: Jaegere Peter De , Serruys Patrick W. , Es Gerrit‐Anne Van , Bertrand Michel , Wiegand Volker , Marquis Jean Francois , Vrolicx Matthias , Piessens Jan , Valeix Bernard , Kober Gisbert , Rutsch Wolfgand , Uebis Rainer 
Published: March 2007

AbstractThe purpose of this study was to determine acute recoil of the vessel wall immediately after Wiktor stent implantation in native coronary arteries of 77 consecutive patients and to assess whether there was compression or “late recoil” of the stent itself at long‐term follow‐up. Furthermore, the relationship between recoil and a number of clinical, angiographic, and procedural variables was studied in addition to the relation between acute recoil renarrowing or restenosis was assessed. All angiograms were analyzed with the Cardiovascular Angiography Analysis System using automated edge detection. Acute recoil was defined by the difference between the mean diameter of the fully expanded balloon on which the stent was mounted and the mean diameter of the stented segment. Late recoil was calculated by comparing the mean diameter of the stent itself immediately after implantation and at follow‐up without opacification of the vessel.Acute recoil amounted to 0.25 ± 0.32 mm or 8.2%. Multivariate analysis identified sex (coefficient = –0.20, p = 0.04) and stent/artery ratio (coefficient = 0.99, p = 0.0001) as the only independent predictors of acute recoil. “Late recoil” of the stent itself was not observed. The overall difference between the mean diameter of the stent itself immediately after implantation and at follow‐up was –0.15 ± 0.33 mm, suggesting an overall increase in diameter of 5.0%. There was no relation between acute recoil and late restenosis. On the contrary, there was a trend towards a greater degree of recoil in patients without restenosis. Moreover, linear regression analysis disclosed a weak but negative correlation between acute recoil and a loss in minimal luminal diameter (coefficient: –0.55, p = 0.04).The Wiktor stent effectively scaffolds the instrumented vessel. Only a minimal amount of acute recoil was noted, which did not contribute to late luminal renarrowing or restenosis. In addition, no late compression of the stent itself was observed. These data suggest that tissue ingrowth into the lumen of the stented segment is the main cause of late luminal renarrowing after stent implantation. © 1994 Wiley‐Liss,Inc..
Perforations after percutaneous coronary interventions: clinical, angiographic, and therapeutic observations
Authors: Ajluni Steven C. , Glazier Sue , Blankenship Lisa , O'Neill William W. , Safian Robert D. 
Published: March 2007

AbstractCoronary perforation is a rare, but potentially catastrophic, complication of percutaneous coronary intervention. A retrospective review of the Cardiology Quality Assurance Database was performed for all percutaneous coronary interventions (n = 8,932) at William Beaumont Hospital from October 1988 to December 1992. Coronary artery perforation was reported in 35 patients (0.4%), including after percutaneous transluminal coronary angioplasty (PTCA, 11/7,905, 0.14%), transluminal extraction coronary atherectomy (TEC, 6/420, 1.3%), directional coronary atherectomy (DCA, 1/249, 0.25%), and excimer laser coronary angioplasty (ELCA, 5/242, 2%); and none after high‐speed mechanical rotational atherectomy with the Rotablator (MRA, 0/116, 0%). Perforations were classified by coronary angiography as free perforations (n = 10), contained perforations (n = 17), or other types of perforation (n = 8). Although perforation was apparent in 32 (91%) of 35 angiograms, delayed cardiac tamponade occurred in 3 patients (9%), despite the absence of angiographic evidence for perforation at the time of the procedure. Causes of perforation were the guidewire in 7 (20%), an interventional device in 26 (74%), and indeterminate in 2 (6%). Complex B2 or C lesions accounted for 83% of perforations. Final treatment included conservative therapy (reversal of anticoagulation and/or PTCA) in 22 (63%) and surgical intervention (with or without bypass surgery) in 13 (37%). Serious clinical complications included cardiac tamponade in 6 (17%), blood transfusion in 12 (34%), myocardial infarction in 9 (26%), and death in 3 (9%). © 1994 Wiley‐Liss,Inc..
Myocardial infarction and polycythemia vera: how should we treat it?
Authors: Venegoni Paolo , Schroth George 
Published: March 2007

AbstractLittle is known about the management and treatment of coronary thrombosis in polycythemia vera (PV) [1]. We describe a case of acute myocardial infarction in a patient with recently diagnosed PV and thrombocytosis. The patient underwent emergency catheterization with intracoronary thrombolysis and angioplasty of the left anterior descending coronary artery. © 1994 Wiley‐Liss,Inc..
Percutaneous transluminal coronary angioplasty of the left internal thoracic artery graft: a case report in a child
Authors: Kawata Tetsuji , Hasegawa Junichi , Yoshida Yoshitsugu , Yoshikawa Yoshiro , Kawachi Kanji , Kitamura Soichiro 
Published: March 2007

AbstractA 9‐year‐old girl who had undergone previous coronary artery bypass surgery at the age of 3.5 years for stenoses of the left anterior descending and right coronary arteries resulting from Kawasaki disease presented with recurrent exertional angina. Stenosis was found at the anastomosis of the left internal thoracic artery to the left anterior descending artery. Percutaneous transluminal coronary angioplasty was successfully performed. This is the first reported case of percutaneous transluminal coronary angioplasty of an internal thoracic artery graft in a child. © 1994 Wiley‐Liss,Inc..