Aortic stenosis is most commonly caused by age-related progressive calcification (>50% of cases) with a mean age of 65 to 70 years. Another major cause of aortic stenosis is the calcification of a congenital bicuspid aortic valve (30-40% of cases) typically presenting earlier, in those aged 40+ to 50+.
https://en.wikipedia.org/wiki/Aortic_valve_stenosis
Aortic stenosis is abnormal narrowing of the aortic valve. A number of conditions cause disease resulting in narrowing of the aortic valve. When the degree of narrowing becomes significant enough to impede the flow of blood from the left ventricle to the arteries, heart problems develop.
http://www.medicinenet.com/aortic_stenosis/article.htm
Aortic stenosis (AS) is a narrowing of the aortic valve in the heart. This valve is located between the left ventricle (lower pumping chamber) and the aorta. The aorta is the largest artery in the body. It transports blood from the heart throughout the body. The aortic valve has three cusps, or flaps, that control the direction and flow of the blood. Aortic stenosis causes obstruction or blockage of blood flow through this valve.
http://www.lifescript.com/health/centers/heart_health/related_conditions/aortic_stenosis.aspx
Carotid stenosis is a narrowing of the carotid arteries, the two major arteries that carry oxygen-rich blood from the heart to the brain. Also called carotid artery disease, carotid stenosis is caused by a buildup of plaque (atherosclerosis) inside the artery wall that reduces blood flow to the brain. Treatment aims to reduce the risk of stroke by controlling or removing plaque buildup and preventing blood clots.
http://www.mayfieldclinic.com/PE-CarotidStenosis.htm
Carotid artery stenosis is a narrowing in the large arteries located on each side of the neck that carry blood to the head, face and brain. The narrowing usually results from atherosclerosis, or a build-up of plaque on the inside of the arteries. Over time, stenosis can advance to complete blockage of the artery.
https://www.radiologyinfo.org/en/info.cfm?pg=carotidStenosis
Aortic stenosis (AS or AoS) is the narrowing of the exit of the left ventricle of the heart (where the aorta begins), such that problems result. It may occur at the aortic valve as well as above and below this level. It typically gets worse over time.
https://en.wikipedia.org/wiki/Aortic_valve_stenosis
Carotid stenosis is a progressive narrowing of the carotid arteries in a process called atherosclerosis. Normal healthy arteries are flexible and have smooth inner walls. As we age, hypertension and small injuries to the blood vessel wall can allow plaque to build up.
http://www.mayfieldclinic.com/PE-CarotidStenosis.htm
The main causes of aortic stenosis include: A birth defect of the aortic valve, which normally has three cusps: An aortic valve that has only one cusp or is otherwise stenotic from birth. A bicuspid (two-part) aortic valve with progressive wear and tear.
http://www.lifescript.com/health/centers/heart_health/related_conditions/aortic_stenosis.aspx
Carotid Artery Stenosis. 1  Carotid artery stenosis is a narrowing of the large arteries on either side of the neck that carry blood to the head, face and brain. This narrowing is usually the result of a build-up of plaque within the arteries, a condition called atherosclerosis.
https://www.radiologyinfo.org/en/info.cfm?pg=carotidStenosis
Aortic stenosis can be caused by congenital bicuspid aortic valve, scarred aortic valve of rheumatic fever, and wearing of aortic valve in the elderly. Aortic stenosis can cause chest pain, fainting, and heart failure leading to shortness of breath. Echocardiogram and cardiac catheterization are important tests in diagnosing and evaluating severity of aortic stenosis.
http://www.medicinenet.com/aortic_stenosis/article.htm
what causes arterial stenosis
An arterial stenosis is a birth defect of the aortic valve, which normally has three cusps. The following causes arterial stenosis: A birth defect of the aortic valve, which normally has three cusps: An aortic valve that has only one cusp or is otherwise stenotic from birth. A bicuspid or two part aortic valve with progressive wear and tear.