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Kuralay Erkan - - 2008
Classical internal cardiac massage mostly can increase systolic blood pressure to maintain sufficient brain and systemic organ perfusion but diastolic blood pressure commonly remains below 10 mmHg. To be able to increase the diastolic blood pressure sufficiently, the surgeon grabs the distal part of the ascending aorta between the thumb ...
Wu Chih-Cheng - - 2008
PURPOSE: To compare the technical success, safety, and patency of cutting balloon angioplasty versus high-pressure balloon angioplasty in the treatment of resistant native hemodialysis fistula stenoses. MATERIALS AND METHODS: The authors retrospectively reviewed 1,220 percutaneous transluminal angioplasty procedures performed to treat dysfunctional native hemodialysis fistulas. Seventy patients with stenoses resistant ...
Schmoker Joseph D - - 2008
BACKGROUND: There is no consensus on the mechanism of traumatic injury to the thoracic aorta and no reproducible animal model. Advances in injury scene analysis suggest that lateral and oblique force vectors cause aortic injury. We hypothesized that the spectrum of aortic injury could be reproduced in an animal model ...
Tsai Thomas T - - 2008
Follow-up mortality is high in patients with type B aortic dissection (TB-AD) approaching one in four patients at 3 years. A predictor of increased mortality is partial thrombosis of the false lumen which may occlude distal tears. The hemodynamic consequences of differing tear size, location, and patency within the false ...
Salguero Gustavo - - 2008
BACKGROUND: Enhanced mechanical forces, e.g. in arterial hypertension, stimulate the formation of reactive oxygen species (ROS) by the NAD(P)H oxidase. Since bone marrow derived endothelial progenitor cells (EPCs) contribute to vascular remodeling and repair, we investigated whether renovascular hypertension stimulates EPC mobilization in a NAD(P)H oxidase-dependent manner. METHODS: Renovascular hypertension ...
Silveira Pierre Galvagni - - 2008
PURPOSE: To establish a correlation between intrasac pressure measurements of a pressure sensor and an angiographic catheter placed in the same aneurysm sac before and after its exclusion by an endoprosthesis. METHODS: Patients who underwent endovascular abdominal aortic aneurysm repair and received an EndoSure wireless pressure sensor implant between March ...
Gilles R - - 2008
Two adult patients with presumed primary hypertension are presented. In the first patient the diagnosis of coarctation of the aorta was straightforward while in the second patient there was a substantial delay in reaching the correct diagnosis. A 32-year-old patient was analysed for hypertension in the outpatient clinic. At physical ...
Tanaka Shinichiro - - 2008
The recent SCORES trial demonstrated that lower dilatation pressures seen with self-expanding (SE) stents may be associated with lower rates of target lesion revascularization (TLR). To determine whether SE stents with low-pressure dilatation are as safe and effective as balloon expandable (BE) stents. We randomly assigned 254 patients with 279 ...
Hashemzadeh Khosro - - 2008
The benefit of coarctation repair on the resolution of systolic hypertension in adults has been questioned. In this retrospective study, hypertension was assessed in 38 adults (22 men, 16 women; mean age, 25.6 +/- 6.9 years; range, 16-39 years) who underwent coarctation repair between 1996 and 2006. Thirty patients had ...
Weber Howard S - - 2008
Assess the early and intermediate results with respect to blood pressure control in older children undergoing endovascular stenting for native coarctation of the aorta. Eleven hypertensive patients (10 +/- 3 years of age) underwent endovascular stenting via standard techniques for native coarctation of the aorta as an alternative to surgical ...
Forman Jason - - 2008
Rupture of the thoracic aorta is a leading cause of rapid fatality in automobile crashes, but the exact mechanisms of this injury remain unidentified. One commonly postulated mechanism is a differential motion of the aortic arch relative to the heart and its neighboring vessels caused by high-magnitude acceleration of the ...
Musto Carmine - - 2008
INTRODUCTION: Endovascular management of aortic coarctation (CoA) is safe but few data are available concerning the long-term cure of hypertension. Aim of this study was to evaluate immediate and long-term clinical and haemodynamic outcome in a consecutive series of adolescent and adult patients with CoA submitted to endovascular treatment. METHODS: ...
Hoppe Hanno - - 2008
The purpose of this single-center study was to report our initial experience with an implantable remote pressure sensor for aneurysm sac pressure measurement in patients post-endovascular aneurysm repair (EVAR) including short-term follow-up. A pressure sensor (EndoSure, Atlanta, GA) was implanted in 12 patients treated with different commercially available aortic endografts ...
Lashley Daniel - - 2007
To reproduce in an adult population a pediatric study that found an association between aortic arch geometry and late systemic hypertension following successful repair of aortic coarctation. Fifty-one patients with successful repair of coarctation of the aorta had blood pressure measurement at rest and during exercise. After cross-sectional imaging of ...
Akhtar Mohammad Irfan - - 2007
A twelve years old female patient presented with headache off and on and disparity between upper and lower limb pressures. On the basis of history, physical examination and magnetic resonance angiography, the patient was diagnosed as mid aortic syndrome and planned for elective aorto aortic bypass graft surgery through left ...
Murakami Tomoaki - - 2007
After successful surgical repair in patients with aortic coarctation, the early onset of cardiovascular diseases is an important subsequent complication and one of the causes is the enhanced aortic pressure wave reflection. Balloon angioplasty has become established as an effective alternative to surgery, but there have been no reports regarding ...
Hynecek Robert L - - 2007
Endotension has been defined as persistently increased pressure within the excluded sac of an abdominal aortic aneurysm (AAA) resulting in increasing aneurysm size after endovascular repair in the absence of endoleak. Devices that use expanded polytetrafluoroethylene (ePTFE) have been associated with the development of endotension and continued AAA enlargement. In ...
O'Neill Anne C - - 2007
BACKGROUND AND OBJECTIVES: Photochemical tissue bonding (PTB) combines photoactive dyes with visible light to create fluid-tight seals between tissue surfaces without causing collateral thermal damage. The potential of PTB to improve outcomes over standard of care microsurgical reanastomoses of blood vessels in ex vivo and in vivo models was evaluated. ...
Moftakhar R - - 2007
BACKGROUND AND PURPOSE: Currently, more reliable parameters to predict the risk of aneurysmal rupture are needed. Intra-aneurysmal pressure gradients and flow maps could provide additional information regarding the risk of rupture. Our hypothesis was that phase contrast with vastly undersampled isotropic projection reconstruction (PC-VIPR), a novel 3D MR imaging sequence, ...
Grabow Niels - - 2007
Safe vascular stent application requires rapid expansion of the stent to minimize the risk of procedural ischemia. While high expansion speeds can be achieved with metallic stents, they are not necessarily feasible with biodegradable polymeric stents due to the viscoelastic material behavior. This study reports on a novel biodegradable polymer ...
Hager Alfred - - 2007
OBJECTIVE: Recent studies have demonstrated that there is a loss of aortic compliance in patients after coarctation repair. The clinical effect of this and other mechanisms apart from restenosis on the rate of arterial hypertension is unknown. METHODS: From 1974 through 2000, 404 patients born before January 1, 1985, underwent ...
Dias Nuno V - - 2007
This was a study of intra-aneurysm sac pressures in patients who presented with endoleaks after endovascular repair (EVAR) of abdominal aortic aneurysms (AAA). Twenty-five patients (18 men, 7 women) with endoleaks, age (IQR 68 to 80), underwent 31 direct intra-aneurysm sac pressure measurements, DISP at 16 months after EVAR (IQR, ...
Hinnen J W - - 2007
OBJECTIVE: The relation between endoleak and aneurysm sac pressure is not completely clear. This review evaluates the effect of endoleaks on aneurysm sac pressure and summarizes the present knowledge regarding aneurysm sac pressure after EVAR. METHODS: A systematic search of literature was carried out using MEDLINE, EMBASE and Web of ...
Killeen Shane - - 2007
BACKGROUND: Many vascular events, such as myocardial infarction and cerebrovascular accident, demonstrate a circadian pattern of presentation. Blood pressure is intimately related to these pathologies and is the one physiological variable consistently associated with abdominal aortic aneurysm rupture. It also demonstrates a diurnal variation. The purpose of this study was ...
Howell Benjamin A - - 2007
PURPOSE: To assess the hemodynamic forces on a bifurcated abdominal aortic stent-graft under realistic conditions of flow, blood pressure, and sac pressure. METHODS: Computational fluid dynamics was used to study the temporal and spatial variations in surface pressure and shear through the cardiac cycle on models of bifurcated stent-grafts derived ...
O'Brien T - - 2008
Abdominal aortic aneurysm (AAA) is a serious complication of the aorta and is treated using vascular bypass grafts. Two main classes of graft are available to treat AAA; grafts implanted by open surgery and stent-grafts implanted using minimally invasive endovascular techniques. Both classes of graft consist of an aortic section ...
Springer Fabian - - 2007
A feasibility study on a completely digital telemetric pressure sensor (TPS) to detect endoleaks was performed in an in vitro model of an abdominal aortic aneurysm (AAA). An endovascular-stented AAA silicone model with different types (I-III) and sizes (3-11 French) of endoleaks was created and pulsatile pressure was applied with ...
Scharfschwerdt Michael - - 2007
BACKGROUND: Prosthetic replacement of the ascending aorta with nonelastic vascular grafts impairs the local Windkessel function. Whether this increases wall tension in the remaining aorta is still a not completely investigated hypothesis but is of clinical relevance with respect to postprocedural development of aneurysms and dissections, especially in the proximal ...
Kang Woong Chol - - 2007
BACKGROUND: The aim of this study was to evaluate the effect of preinterventional arterial remodeling on in-stent intimal hyperplasia (IH) after the implantation of a polymer-based paclitaxel-eluting stent. METHODS: The study population consisted of 55 patients (61 lesions) with a de novo lesion treated with a paclitaxel-eluting stent. The lesions ...
Ohki Takao - - 2007
Complete exclusion and depressurization of the aneurysm sac is the prime goal of endovascular repair (EVAR) of abdominal aortic aneurysms. Thus, any EVAR that results in a type I or III endoleak has been classified as a technical failure. The current method to detect endoleaks uses intraoperative aortography. However, aortography ...
Wolters B J B M - - 2007
The outcome of endovascular repair of abdominal aortic aneurysms (AAAs) is greatly compromised by the possible occurrence of endoleak. Previously, the causes and effects of endoleak on a patient-specific basis have mainly been investigated in experimental studies. In order to both reconcile and physically substantiate the various experimental findings, a ...
Chaer Rabih A - - 2006
The utility of intra-aneurysmal pressure determination is dependent on the ability to measure pressure in the presence of endoleak and thrombosis. In this study, the accuracy of a CardioMEMS wireless pressure sensor (CardioMEMS, Atlanta, Ga) transducer in the presence of thrombus associated with type II endoleak was measured. Type II ...
Asif Arif - - 2006
Intra-access static pressure ratio (SPR) (intra-access pressure/mean arterial pressure) can be measured during angioplasty (PTA) to assess the functional importance of an arteriovenous graft (AVG) stenosis. We used SPR in 70 patients with AVGs who underwent 98 angioplasty procedures. SPR was measured during angioplasty by placing a catheter tip at ...
Kweon T D - - 2006
BACKGROUND: Side-clamping of the ascending aorta during off-pump coronary artery bypass surgery (OPCAB) may be associated with a significant increase in systemic blood pressure which may rarely result in aortic dissection. We evaluated whether topical application of lidocaine on the ascending aorta could reduce the rise in systemic blood pressure ...
Hu J-J - - 2007
Hypertension is a significant risk factor for diverse cerebrovascular diseases ranging from stroke to arteriovenous malformations and saccular aneurysms. Our increasing understanding of vascular mechanobiology reveals that changes in mechanical stimuli, such as increased blood pressure, alter basic cellular functions including the production and degradation of extracellular matrix as well ...
Tan L P - - 2006
Biodegradable helicoidal stent prototypes made up of layers of poly-L-lactic acid (PLLA) and poly(L-lactic-co-glycolic acid) (PLGA) polymers were fabricated by temperature conditioning the stents at different stages of fabrication. The process incorporated elastic memory, or self-expandability in the stent, which is desirable to minimize stent recoil. The collapse pressures of ...
Hegde Shivaram - - 2007
Early unilateral nephrectomy was carried out in four young children with unilateral renovascular disease, a poorly functioning kidney and hypertension. At follow-up 5-16 years later all showed normal growth, blood pressure and renal function, and only one child had low-grade albuminuria. Unilateral nephrectomy seems to be a safe and effective ...
Kember G C - - 2006
A mechanism is proposed by which the patch of baroreceptors along the inner curvature of the arch of the aorta can sense hemodynamic events occurring downstream from the aortic arch, in the periphery of the arterial tree. Based on a solution of equations governing the elastic movements of the aortic ...
Raghavan M L - - 2006
Arterial aneurysms are in a pre-deformed state in vivo under non-zero pressure. The ability to determine their zero pressure geometry may help in improving accuracy of determination of stress distribution and reverse estimation of material properties from dynamic imaging data. An approximate method to recover the zero pressure geometry of ...
Shroff Rukshana - - 2006
OBJECTIVE: Our aim was to evaluate the clinical outcomes, safety, and efficacy of percutaneous transluminal angioplasty for renovascular hypertension in children. METHODS: A retrospective review of data for all children with renovascular hypertension who underwent percutaneous transluminal angioplasty at a single center between 1984 and 2003 was performed. Patients with ...
Yamashiro Masahito - - 2006
OBJECTIVE: We investigated the advantages of reconstructing the aortic arch in neonates and infants by end-to-side anastomosis (ESA) in aortic coarctation and type A aortic arch interruption. SUBJECTS AND METHODS: The patients were 28 neonates and infants who underwent median full sternotomy for correction of aortic coarctation (CoA) and type ...
Ovechkin Alexander V - - 2006
Chronic hyperhomocysteinemia (HHcy) is an important factor in development of arterial hypertension. HHcy is associated with activation of matrix metalloproteinases (MMPs); however, it is unclear whether HHcy-dependent extracellular matrix (ECM) accumulation plays a role in arterial hypertrophy and hypertension. We tested the hypothesis that in HHcy the mechanism of arterial ...
McLaren Clare A - - 2006
Airway compression is a common problem in children with certain forms of congenital heart disease. Although various surgical approaches are available to overcome this form of airway obstruction, internal stenting is necessary in a minority of patients. It can be difficult to assess the success of stenting at the time ...
Pornratanarangsi Suwatchai - - 2006
Controlled hypotension is critical to the accurate deployment of aortic endografts and safe balloon post-dilation. We describe the use of rapid ventricular pacing during 15 aortic stenting procedures. An immediate and sustained reduction in both phasic and mean blood pressure was achieved in all patients. This procedure has advantages over ...
Vesely Thomas M - - 2006
PURPOSE: This two-part prospective investigation was designed to determine the balloon inflation pressures required to dilate stenoses associated with hemodialysis grafts and evaluate the burst pressures of five different angioplasty balloons. MATERIALS AND METHODS: Eighty-nine patients with dysfunctional hemodialysis grafts were enrolled and underwent fistulography. The diagnostic studies revealed 104 ...
Hinnen Jan-Willem - - 2006
PURPOSE: To determine the effect of pulsatile motion of graft-attached pressure sensors on the accuracy of aneurysm sac pressure measurement. METHODS: Pressure inside a pressure box was measured with a sensor attached to a stent-graft (Sensorgraft) facing a sensor in fixed position (Sensorbox). Maximum inter-sensor variation of Sensorgraft and Sensorbox ...
Liffman Kurt - - 2006
PURPOSE: To investigate the stability and movement of modular aortic stent-grafts subjected to oscillating forces from pulsatile blood flow, with particular reference to the thoracic aorta. METHODS: Analytical mathematical modeling was used to understand the forces on modular grafts. In a benchtop experiment, a transparent acrylic box was filled with ...
Li Z - - 2006
Insertion of a stent-graft into an aneurysm, especially abdominal aortic aneurysms (AAAs), is a very attractive surgical intervention; however, it is not without major postoperative complications, such as endoleaks. An endoleak is the transient accumulation of blood in the AAA cavity, which is formed by the stent-graft and AAA walls. ...
Eicken Andreas - - 2006
AIMS: The current study was designed to assess midterm results of stent implantation into the aorta for native and recurrent coarctation (CoA) in children and young adults. METHODS AND RESULTS: Forty-three patients (native CoA, 8; female, 12) were treated with stent implantation at a median age of 16.8 years (range ...
Olbrich T - - 2006
This study assessed the clinical and practical value of angioplasty balloon pressure-volume data, obtained by a computer-controlled balloon inflation device, during standard percutaneous coronary intervention (PCI) procedures. Stent deployment was studied for 57 lesions in 34 patients. Angiographic predilation data were available in 9 patients. Vessel lumen improvement with pre-dilation ...
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