artium one of the two upper chambers of the heart.
ascites accumulation of serous fluid in the abdominal cavity.
atheroma same as atherosclerosis, raised plaques filled with cholesterol, calcium, and other substances on the inner wall of arteries that obstruct the lumen and the flow of blood; the plaque of atheroma hardens the artery, hence the term atherosclerosis (sclerosis = hardening).
atheromatous same as atherosclerotic, a plaque that juts into the lumen and obstructs the flow of blood in arteries.
atherosclerosis same as theroma, raised plaques filled with cholesterol, calcium, and other substances on the inner wall of arteries that obstruct the lumen and the flow of blood; the plaque of atheroma hardens the artery, hence the term atherosclerosis (sclerosis = hardening).
atherothrombosis when a plaque of atheroma is fissured or ruptures, the contents of the plaque are highly thrombo-genic and a clot (thrombus) forms rapidly causing complete occlusion of arteries leading to myocardial infarction, stroke, or other cardiovascular events (atheroma plus thrombosis ¼ atherothrombosis).
atrial fibrillation the most common, persistent arrhythmia that is seen in medical practice; it may precipitate thrombo-embolic stroke.

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