TY - JOUR. T1 - Age dependency of the biaxial biomechanical behavior of human abdominal aorta. AU - Vande Geest, Jonathan P. AU - Sacks, Michael S.. AU - Vorp, David A.. PY - 2004/12. Y1 - 2004/12. N2 - Background: The biomechanical behavior of the human abdominal aorta has been studied with great interest primarily due to its propensity to develop such maladies as atherosclerotic occlusive disease, dissections, and aneurysms. The purpose of this study was to investigate the age-related biaxial biomechanical behavior of human infrarenal aortic tissue. Methods of Approach: A total of 18 samples (13 autopsy, 5 organ donor) were harvested from patients in each of three age groups: Group 1 (,30 years old, n =5), Group 2 (between 30 and 60 years old, n =7), and Group 3 (,60 years old, n =6). Each specimen was tested biaxially using a tension-controlled protocol which spanned a large portion of the strain plane. Response functions fit to experimental data were used as a tool to guide the appropriate ...
OBJECTIVE: To apply a new non-invasive method for quantification of in vivo wall shear stress (WSS) by magnetic resonance (MR) FAcE velocity mapping and measure WSS in the human abdominal aorta. DESIGN: Prospective, open study. MATERIAL: Six voluntee
PubMed journal article Age-related increase in wall stress of the human abdominal aorta: an in vivo stud were found in PRIME PubMed. Download Prime PubMed App to iPhone or iPad.
BACKGROUND: Peripheral arterial disease and vascular calcifications contribute significantly to the outcome of dialysis patients. The aim of this study was to evaluate the prognostic role of severity of abdominal aortic calcifications and peripheral arterial disease on outcome of peritoneal dialysis (PD) patients using methods easily available in everyday clinical practice.. METHODS: We enrolled 249 PD patients (mean age 61 years, 67% male) in this prospective, observational, multicenter study from 2009 to 2013. The abdominal aortic calcification score (AACS) was assessed using lateral lumbar X ray, and the ankle-brachial index (ABI) using a Doppler device.. RESULTS: The median AACS was 11 (range 0 - 24). In 58% of the patients, all 4 segments of the abdominal aorta showed deposits, while 19% of patients had no visible deposits (AACS 0). Ankle-brachial index was normal in 49%, low (, 0.9) in 17%, and high (, 1.3) in 34% of patients. Altogether 91 patients (37%) died during the median follow-up ...
TY - JOUR. T1 - Numerical analyses of the interrelation between extracellular smooth muscle orientation and intracellular filament overlap in the human abdominal aorta. AU - Haspinger, Daniel Ch. AU - Murtada, Sae Il. AU - Niestrawska, Justyna A.. AU - Holzapfel, Gerhard A.. PY - 2018/12/1. Y1 - 2018/12/1. N2 - Smooth muscle cells are one of the functional constituents in the human abdominal aorta, located in the medial layer, forming two helices similar to collagen fibers. During development, angiogenesis and vascular remodeling, smooth muscle cells experience changes in their orientation and a reorganization of their intracellular filament structure. In order to study the so far not so well-known interrelation between smooth muscle orientation and the intracellular filament structure in the human abdominal aorta a recently proposed mechanochemical model is modified. Two families of muscle fibers are introduced with a non-symmetric filament overlap behavior, and the model is implemented into a ...
Title: Propofol and Systemic Inflammatory Response in Abdominal Aortic Surgery. VOLUME: 5 ISSUE: 2. Author(s):Jose M. Rodriguez-Lopez and Francisco S. Lozano. Affiliation:Servicio de Anestesiologia,Hospital Universitario de Salamanca, Paseo de San Vicente, 58-182, 37007,Salamanca, Spain.. Keywords:Propofol, Systemic inflammatory response, Aortic surgery, Aortic cross-clamping. Abstract: Abdominal aortic surgery is relatively common associated with considerable postoperative morbidity and mortality. The aortic cross-clamping for the implantation of a vascular prosthetic graft induces a systemic inflammatory response (SIR) because of an ischemia-reperfusion (IR) injury. In our experimental models we have reported that propofol anesthesia, compared with sevoflurane, after IR modulates SIR and this effect might result in renal protection. ...
1. Vande Geest JP, Di Martino ES, Vorp DA*. "An Analysis of the Complete Strain Field within FlexercellTM Membranes", Journal of Biomechanics, 2004 Dec;37(12):1923-8. 2. Vande Geest JP, Sacks MS, Vorp DA*. "Age Dependency of the Biaxial Biomechanical Behavior of Human Abdominal Aorta", Journal of Biomechanical Engineering, 2004 Dec:126:815-822. 3. Vorp DA*, Vande Geest JP. "Biomechanical Determinants of Abdominal Aortic Aneurysm Rupture", Arteriosclerosis Thrombosis and Vascular Biology, 2005 Aug;25(8):1558-66 (invited review paper). 4. Freytes DO, Rundell AE, Vande Geest JP, Vorp DA, Webster TJ, and Badylak SF*. "Analytically Derived Material Properties of Multilaminated Extracellular Matrix Devices using the Ball-burst Test", Biomaterials, 2005 26(27):5518-5531. 5. Vande Geest JP, Sacks MS, Vorp DA*. "The Effects of Aneurysm on the Biaxial Mechanical Behavior of Human Abdominal Aorta", Journal of Biomechanics, 2006 39(7):1324-1334. 6.Vande Geest JP, Wang DH, Wisniewski SR, Makaroun MS, Vorp ...
Sigma-Aldrich offers abstracts and full-text articles by [Xianming Su, Xiaowen Zhi, Ting Cui, Qiaowei Zheng, Shixiang Wang, Yongxiao Cao, Changcong Cui, Weiyi Feng].
BACKGROUND: Total occlusion of the infrarenal abdominal aorta is a very rare disease in clinical practice. The clinical outcome may be poor unless management is attempted promptly. Surgical bypass has been recommended as the treatment of choice for these lesions. However, there was relatively high surgical mortality and morbidity associad with aorto-bifemoral bypass graft in patients with other systemic disease, especially coronary artery disease. As a result, the use of, thrombolysis with percutaneous transluminal angioplasty (PTA) has recently been extended to this disease as an alternative method to surgery. PTA is technically simpler with less morbidity and mortality than surgery.We report our experience with thrombolysis and balloon angioplasty of total aortic occlusion in 14 patients between March 1991 and December 1996. METHODS: Fourteen patients, whose mean age was 59+/-13 years (11 male, 3 female), serve as the studys patients. Aortography was introduced via transbrachial artery. The ...
An abdominal aorta scan uses high-frequency sound waves to visualize the abdominal aorta. Using a specialized Doppler technique, we can also measure the movement of blood within the vessels. This provides detailed pictures of these blood vessels to help physicians determine if there is enlargement of the aorta.
LIGATION OF THE ABDOMINAL AORTA: REPORT OF THE ULTIMATE RESULT, ONE YEAR, FIVE MONTHS AND NINE DAYS AFTER LIGATION OF THE ABDOMINAL AORTA FOR ANEURISM AT THE BI
During an abdominal aorta scan, the mobile technologist uses two types of ultrasound to systematically interrogate the entire length of the abdominal aorta. He
TY - JOUR. T1 - The retroperitoneal, left flank approach to the supraceliac aorta for difficult and repeat aortic reconstructions. AU - Mills, Joseph L. AU - Fujitani, Roy M.. AU - Taylor, Spence M.. PY - 1991. Y1 - 1991. N2 - Between 1986 and 1990, 11 patients with relative or absolute contraindications to standard infrarenal reconstructions underwent supraceliac aortofemoral bypass. The operation was performed through a left-flank incision extended into the eleventh intercostal space with retroperitoneal and extrapleural dissection. Indications included multiple failed infrarenal reconstructions in four patients, previous removal of infected aortofemoral bypass graft with failure of extra-anatomic bypass in five patients, prior para-aortic lymph node dissection and radiotherapy in one patient, and aortic aneurysmal disease proximal to the renal arteries in one patient. Bypass conduits included either a bifurcated Dacron graft or a tube graft to the left femoral artery with a femorofemoral ...
Open aortic surgery is employed for patients who have indications for abdominal aortic aneurysm (AAA) repair but unfavorable anatomy for endovascular aortic repair. Open aortic surgery is also necessary to manage aortic thrombosis or repair of aortic
Visit Vascular Diagnostics for a Fort Myers abdominal aorta exam, which could someday save your life from a life-threatening abdominal aortic aneurysm.
Atherosclerosis of aorta abdominal region arises among the first complications of increased cholesterol level in an organism. Danger of disease is that at initial stages it is practically not distinguished, complaints of the patient are absent. When the state worsens there is an abdominal pain of various intensity that depends on the volume of vessels lesion. There is a feeling of gravity and dyspepsia: appetite loss, excessive flatulency, weight loss.. Development of abdominal aorta atherosclerosis leads to more terrible complications. The most dangerous is aneurysm. This is a uniform bottle-shaped expansion of whole vessel with a thinning of its walls or local "protruding" aorta wall.. Such patients have nagging pains in stomach; they are localized in the left half of stomach or near umbilicus, sometimes in loin, seldom inguinal area. Pains begin from attack-like usually right after meal, then in two-three hours stop without assistance.. Feeling of pulsation in stomach is a one more diagnostic ...
An abdominal aortic aneurysm can be repaired with endovascular repair or open surgery. Both methods involve placing an artificial graft inside the damaged artery.
An abdominal aortic aneurysm can be repaired with endovascular repair or open surgery. Both methods involve placing an artificial graft inside the damaged artery.
Thoracic aneurysms occur in the aorta, which is the largest artery in the body. It carries blood away from the heart to all parts of the body. The portion of the aorta that runs through the chest cavity nearest the heart is called the thoracic aorta, while the portion running through the abdomen is known as the abdominal aorta. When a weakened area of the thoracic or abdominal aorta expands or bulges, it is known as a thoracic aortic aneurysm (TAA) or abdominal aortic aneurysm (AAA). Roughly 25 percent of aortic aneurysms occur in the thoracic aorta, while 75 percent occur in the abdominal aorta ...
Inferior Phrenic Arteries are paired branches of the abdominal aorta, originating at the level of T12-L2, consisting of two small vessels, which supplies oxygenated blood to the diaphragm
A Riddle of Esophagography: Where Do the Descending Aorta and the Abdominal Aorta Run in Cases of the Right Aortic Arch? Report of two cases, Sugiura Y, Sh
Contrast-enhanced peripheral MR angiography from the abdominal aorta to the pedal arteries: Combined dynamic two-dimensional and bolus-chase three-dimensional acquisitions Academic Article ...
In 1959 Cook (1) described a clinical syndrome of the occlusion of the abdominal aorta which was dominated by neurological abnormalities. He found four similar cases (2, 3) described under different names and explained differently in respect to their etiology and mechanism. On the basis of his observation of his own two cases and those from the literature, Cook gave the following clinical picture of the syndrome: rapid onset of varying degrees of paraparesis; neurological signs reaching the seventh dorsal segment; areflexia or hyporeflexia of the lower extremities, impaired proprioceptive sensibility; presence of bilateral Babinskis signs; incontinence of the feces ...
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I would like to commend Norris et al . for performing an elegant and important study. 1 The authors answered the primary question of the study and showed that length of hospital stay (LOS) did not differ among the four treatment arms. The rationale for using LOS as the primary outcome measure was that it is the "variable most directly proportional to an integrated final negative effect of all significant perioperative morbidity." Although the authors explain in the discussion why they chose not to focus on "relatively rare events (death and myocardial infarction)," they go on to summarize the important findings of the study in the abstract reporting on LOS followed immediately by the statement:"Postoperative outcomes were similar among the four treatment groups with respect to death, myocardial infarction…". The article lacks a clear statement in the abstract or in the limitations section explaining that the study was insufficiently powered to test differences in these outcomes. The message to ...
Longitudinal image through the normal abdominal aorta (A) with a diameter of 2 cm.. Exam. Begin with the patient in the supine position. Obtain longitudinal and transverse images of entire abdominal aorta and a transverse view of bifurcation to show the iliac arteries. Get a longitudinal image of each iliac artery. Image the superior mesenteric artery (SMA) and celiac artery. Image renal arteries if origins are seen. AAA measurements: AP measurement in longitudinal and transverse views. Measure transverse diameter. Measurements are outer wall to outer wall. If AAA is found, obtain coronal views of right and left kidneys for renal length.. Sonographic Findings: 1) Abdominal aorta , 3 cm, measured from inner wall to inner wall.. ...
Can you please tell us also about the most challenging aortic aneurysm case you managed to treat with a total endovascular solution?. A young 34-year-old mother of two children comes to mind. She had open surgery for coarctation of the abdominal aorta at the age of 18. She developed proximal and distal anastomotic aneurysms of Dacron graft from the proximal descending to the infrarenal aorta involving a reimplanted single left kidney. We performed embolisation of the residual descending aortic lumen to avoid endoleak, implanted a tapered thoracic stent graft percutaneously and, four weeks later, staged a custom-made device for the abdominal segment preserving the renal artery using fusion navigation in very short landing zones. Avoiding re-thoracotomy and laparotomy, working percutaneously and discharging this young patient after three days is so persuasive that "endo", even out of instructions for use and without knowing long-term results, is a huge benefit for many patients, both elderly and ...
94. of such a variation is the comparative incidence of wounds of the vena cava and of the abdominal aorta (pp. 318, 322). Thirty-three of the former were observed, but none of the latter, presumably because wounds of the abdominal aorta were almost immediately fatal.. When the distribution of abdominal visceral injuries in this series is compared with the distribution in other reported series (table 8), two important differences are at once apparent:. 1. In general, the frequency of wounding of all organs was higher in this series than in most other series.. 2. The rate of univisceral to multivisceral wounds was strikingly reversed in comparison with earlier experiences. The assumption seems warranted that in this series a much higher proportion of severely wounded men (that is, men with multiple visceral wounds) reached forward hospitals, and were operated on, than was the case in other reported series. No other explanation seems reasonable for the overall increase in frequency of wounding of ...
A flexible instrument having spoon shaped flat jaws with serrations which makes sure non-traumatic clamping during surgical procedures.
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Arti kata dari aaa. Definisi dari aaa. Pengertian dari aaa: an aneurysm of the abdominal aorta associated with old age and hypertension;
Oxygenated blood begins its course down the chest through the thoracic aorta, a major blood vessel with branches that serve the chest muscles and lungs. This becomes the abdominal aorta.
Stroke and vascular disease affect thousands of Americans each year. A screening for these diseases can measure your risk and provide important information to help improve your vascular health and prevent life-threatening problems. The stroke and vascular screening at Inland Imaging includes a check of the three areas of your body that are most susceptible to signs of vascular disease: the abdominal aorta, the carotid arteries, and the peripheral arteries.. Heart Disease ...
A surgical procedure in which the surgeon uses a graft - either a blood vessel from another part of the body or one made of synthetic fabric - to bypass a blockage and restore blood flow to a blocked abdominal aorta. Typically requires a hospital stay of five to seven days ...
стр. 87 Temporary intra-abdominal extravasal transparietal compression of terminal abdominal aorta - the key to reducing the duration of obstetric bleeding and amount of blood loss Аntonyuk-Kysil V. M., Yenikieieva V. M., Lichner S. І., Lypnyi V. M., Drozd V. V. HEALTH OF WOMAN. 2016.10(116):87-90; DOI 10.15574/HW.2016.116.87 ...
1. Muhammad Ramzan Ul Rehman 1 2. Muhammad Ramzan Ul Rehman 2 3. The abdominal aorta begins at the aortichiatus of the diaphragm, anterior to thelower border of vertebra…
TY - JOUR. T1 - Comparison of transmitted pressure across percutaneous abdominal aorta aneurysm conduits. T2 - A new in vitro model. AU - Thorpe, P. E.. AU - Hunter, D. W.. AU - Chouinard, P.. AU - Agrawal, Devendra K.. AU - Zhan, X. X.. PY - 1996. Y1 - 1996. N2 - The treatment of abdominal aorta aneurysm is aimed at decreasing pressure on the arterial wall which is thought to cause growth and eventual rupture of the aneurysm. If significant pressure is transmitted across percutaneously placed stem-grafts, they may prove unacceptable for abdominal aorta aneurysm repair. Therefore, we developed an in mm model to study transmission of pressure across various materials implanted in an aneurysmal lumen. A pinch roller model producing pulsatile flow through an aneurysm fashioned from heated polyethylene was used with H2O, glycerol and heparinized bovine blood. Continuous pressure readings obtained from 3 sites (above, below and mid aneurysm) were compared between different materials including bare ...
ATLANTA--Researchers have found a link between dysregulated tryptophan metabolism and abdominal aortic aneurysm, a life-threatening vascular disease, according to a new study led by Georgia State University.. Abdominal aortic aneurysm is a permanent, localized enlargement of the abdominal aorta, the largest artery in the abdomen that provides blood to the organs and tissues of the abdomen, pelvis and legs. Because the abdominal aorta is one of four sections of the aorta, the bodys main supplier of blood, a ruptured abdominal aortic aneurysm can cause life-threatening bleeding, according to the Mayo Clinic.. Abdominal aortic aneurysm occurs in up to 9 percent of adults older than 65 years of age, with about 15,000 deaths each year in the United States after rupture. Abdominal aortic aneurysms often grow slowly and without symptoms, making them difficult to detect.. There are no proven therapeutic strategies to block progression of the disease and rupture of the abdominal aorta. The only possible ...
The pathology of the human abdominal aortic aneurysm (AAA) and its relationship to the later complication of intraluminal thrombus (ILT) formation remains unclear. The hemodynamics in the diseased abdominal aorta are hypothesized to be a key contributor to the formation and growth of ILT. The objective of this investigation is to establish a reliable 3D flow visualization method with corresponding validation tests with high confidence in order to provide insight into the basic hemodynamic features for a better understanding of hemodynamics in AAA pathology and seek potential treatment for AAA diseases. A stereoscopic particle image velocity (PIV) experiment was conducted using transparent patient-specific experimental AAA models (with and without ILT) at three axial planes. Results show that before ILT formation, a 3D vortex was generated in the AAA phantom. This geometry-related vortex was not observed after the formation of ILT, indicating its possible role in the subsequent appearance of ILT ...
We describe a case of aortic coarctation at the level of the infrarenal abdominal aorta which is encountered in less than six individuals in one million. In contrast to aortic narrowing above or including the renal arteries, this seems to be a relatively benign anomaly without systemic hypertension or impaired renal function. For the first time in this type of anomaly, contrast-enhanced MR angiography (ce-MRA) on a multi-receiver channel MR system, with an 8-channel phased array coil and parallel imaging was used. Ce-MRA displayed a tortuous, narrowed aortic segment that was found to be associated with mesenteric artery stenosis and compression of the orthotopic left renal vein, also known as the nutcracker phenomenon. All major aortic branches could be depicted using 3D surface-shaded displays and subvolume maximum intensity projections (MIPs). Collateral vessels of the abdominal wall were identified using whole-volume MIPs. Since the majority of aortic malformations are diagnosed at a younger age, and
Introduction. Collagen is the most abundant protein in mammals and gives mechanical strength, stiffness and toughness to biological tissues like skin, tendon, bone, and vasculature [1]. Collagen fibrils of about 0.1 micrometers in diameters are the basic building blocks of fibrous collagenous tissues and their organization into suprafibrilar structures determines the tissues macroscopic mechanical properties. For example, detailed data regarding the organization of strong bundles of collagen might be critical to predict the onset of tissue failure, as it is clinically motivated by a rupture risk assessment of Abdominal Aortic Aneurysm (AAA). Previously proposed structural constitutive models for soft biological tissues [2, 3] integrated information regarding the collagen orientation, and regardless of their popularity, the requested microstructural information is not yet available in the open literature.. Method and Materials. The present study investigated the collagen formation in 12 AAA wall ...
Introduction. Collagen is the most abundant protein in mammals and gives mechanical strength, stiffness and toughness to biological tissues like skin, tendon, bone, and vasculature [1]. Collagen fibrils of about 0.1 micrometers in diameters are the basic building blocks of fibrous collagenous tissues and their organization into suprafibrilar structures determines the tissues macroscopic mechanical properties. For example, detailed data regarding the organization of strong bundles of collagen might be critical to predict the onset of tissue failure, as it is clinically motivated by a rupture risk assessment of Abdominal Aortic Aneurysm (AAA). Previously proposed structural constitutive models for soft biological tissues [2, 3] integrated information regarding the collagen orientation, and regardless of their popularity, the requested microstructural information is not yet available in the open literature.. Method and Materials. The present study investigated the collagen formation in 12 AAA wall ...
Endovascular treatment of occlusive disease of the aortic bifurcation is challenging. We developed the Covered Endovascular Reconstruction of Aortic Bifurcation or CERAB-technique, as a new approach for extensive and/or recurrent aortoiliac occlusive disease using three covered balloon expandable stents to reconstruct the aortic bifurcation. This configuration provides the ability to deal with TransAtlantic Inter-Society Consensus (TASC II) C and D lesions, simulating a neo-bifurcation or flow divider in combination with the benefits of covered stents. The intervention can be performed percutaneously or as a hybrid procedure. Initial results are encouraging and further studies are indicated.. ...
Objective: Abnormalities of the aortic root and ascending aorta are common in patients with a bicuspid aortic valve (BAV). The aim of this study was to evaluate the stiffness of the abdominal aorta in children with BAV.Methods: In this cross-sectional observational study, we evaluated 35 children with normally functioning or mildly regurgitant BAV and 35 healthy children as controls. All children were noninvasively evaluated with transthoracic echocardiography. Annulus of aorta and abdominal aorta diameters were measured. Aortic strain (S), pressure strain elastic modulus (Ep), pressure strain normalized by diastolic pressure (Ep*), aortic stiffness β index (βSI) and, aortic distensibility (DIS) were calculated using the measured data. In evaluation of the data Students t-test, Chi-square test, Pearsons correlation and multivariate linear regression analysis were used.Results: Diameter of the aortic annulus was found significantly larger in the children with BAV than the control group (p|0.05). The
TY - JOUR. T1 - Seat belt injuries of the abdominal aorta in adults - Case report and literature review. AU - Freni, Luca. AU - Barbetta, Iacopo. AU - Mazzaccaro, Daniela. AU - Settembrini, Alberto M.. AU - Dallatana, Raffaello. AU - Tassinari, Luca. AU - Settembrini, Piergiorgio G.. PY - 2013/2. Y1 - 2013/2. N2 - Blunt abdominal trauma with major vascular involvement is found to be rare. Although few series have been reported in the literature, the true incidence of blunt abdominal aortic injury is unknown. Different modalities of blunt trauma may occur among civilians with steering wheel and seat belt injury secondary to motor vehicle accident the most frequent. Mechanical forces produce variable patterns of injury; therefore, the onset of signs and symptoms can be different. Dissection and thrombosis of the abdominal aorta have been frequently described among seat-belted adult patients with major vascular involvement. The associated abdominal viscus and/or vertebral lesions must always be ...
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Abdominal aortic aneurysm (AAA) is a common disease for which mechanisms of formation are still not well understood. Despite a strong genetic component to AAA risk, specific risk alleles are still largely unidentified. AAA is also a localized disease with a majority occurring in the infrarenal abdominal aorta and is six times more common than aneurysms of the thoracic aorta. To determine whether risk alleles are present in functional positional candidate genes. we: 1. performed a genetic association study using DNA from AAA cases and controls in ten candidate genes and 2. performed exon sequencing on three genes with evidence of nominal association. To identify genes with regional expression in the aorta of potential relevance to AAA: 1. Illumina microarrays were used to perform a gene expression profiling of entire baboon aortas and 2. protein expression of one candidate gene, HOXA4, was examined in further detail. Single nucleotide polymorphisms in three positional candidate genes, CEBPG, PEPD and
Hypoplastic infrarenal aorta or infrarenal aortic coarctation is an uncommon vascular pathology characterized with diffuse stenosis in the infrarenal abdominal aorta. It is a variant of atherosclerotic occlusive diseases. The exact incidence and etio
Several studies have demonstrated that AngII infusion leads to the formation of AAAs in mice.12,13,50 AngII exerts its diverse bioactive effects primarily by activating the AT1a receptor in mice, which plays a critical role in AngII-induced AAA development.17 In addition to mediating traditional G-protein-dependent signaling, the AT1a receptor is involved in G-protein-independent signaling by forming a complex with the multifunctional scaffolding protein βarr2.19,24 In the present study, we investigated a role for βarr2 in AngII-induced AAA formation and found that βarr2 deficiency significantly attenuates AAA formation in mice both on a hyperlipidemic apoE background and on a normolipidemic C57BL/6 background (Figure 1). These studies suggest that G-protein-independent, βarr2-dependent signaling for the AT1a receptor plays a major role in AngII-induced AAA formation.. Although our present studies showed that βarr2 deficiency attenuated AngII-induced AAA formation in mice on the ...