Microparticles in Severe Aortic Stenosis

Microparticles are small cell fragments that can induce fat plaques, calcification and formation of thrombus. They can be released through multiple stimulations, but also the high flow of blood through partially obstructed aortic valves. In patients with severely obstructed aortic valves the investigators hypothesize that microparticles levels will be elevated and that they will go down after percutaneous treatment of the valves.