Promotion and relegation rules for the top few levels. For example, here are the promotion and relegation rules for the top few levels of the English football league system: Premier League (level 1, 20 teams): No promotion. Bottom three teams are relegated.
Peripheral vascular disease (PVD), or atherosclerosis of peripheral vessels, is the most common cause of symptomatic stenosis in the human vascular tree. The pathogenetic mechanisms that lead to PVD are similar to those of coronary artery disease (CAD).
What is aortic valve stenosis (AS)? Aortic stenosis is one of the most common and most serious valve disease problems. Aortic stenosis is a narrowing of the aortic valve opening. Aortic stenosis restricts the blood flow from the left ventricle to the aorta and may also affect the pressure in the left atrium. Watch an animation of aortic valve stenosis