Surgical repair of such aneurysms and interposition of vascular protheses were until recently the only treatment option for complicated cases (diameter „d 5.5 cm; impending rupture; malperfusion syndrome; recurrent pain). Although great strides have been achieved by improving surgical techniques, postoperative complications (such as persistent paralysis of both legs, stroke, acute renal failure or pulmonary dysfunction) and 30-day mortality remain high. Especially elderly patients with accompanying illnesses (high blood pressure, chronic pulmonary disease or heart failure) are at high risk. Therefore, these comorbidities have a significant impact on postoperative outcome and further life expectancy.
Conversely, endovascular stent-graft implantation seems to be a promising, non-surgical and less traumatic therapeutic option and avoids surgical opening of the chest. Endovascular protheses are based on the concept of a metal grid covered with graft material (Dacron). The natural healing process begins after complete sealing of the proximal entry tear in dissection (see figure 2) and induces thrombus formation in the false lumen and reconstruction of the aortic wall.
In our institution stent-graft placement was performed in the cardiac catheterization laboratory with patients under general anesthesia and ventilation. In all patients, the femoral or distal iliac artery was surgically exposed and the stent-graft was inserted, advanced and deployed inside the aorta with the use of fluoroscopy and simultaneous ultrasound. Once stent apposition was achieved, the catheter delivery system was removed, and the incision was surgically closed.
Camilla Dormer | alfa
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In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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