disorders of the heart-ch48-2

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Disorders of the heart: Coronary Atherosclerotic Disease Coronary Artery Disease (CAD) - term used to described Varity of conditions that obstruct blood flow in the coronary arteries Atherosclerosis- (common arterial disorder characterized by yellowish  plaques of : Cholesterol Lipids Cellular debris In the inner layers of the walls of large and medium sized arteries This the primary cause of atherosclerotic heart disease (ASHD) Lumen- ( cavity or channe l within any organ of the bod y) the lumen of the vessel narrows as the disease progresses When it occurs in coronary arteries the blood flow to heart is obstructed Obstructions exceeding 75% of the lumen of one or more of the three coronary arteries increases risk of death When myocardial oxygen demands exceeds the supply delivered by the coronary arteries, ischemia results Arteries become less elastic and less responsive to blood flow Angina Pectoris: Angina- spasmodic, cramp like, chocking feeling A-P used to denote paroxysmal (marked, usually episodic, increase in symptoms) thoracic pain and choking feeling caused by decreased oxygen or anoxia (lack of oxygen) of the myocardium Occurs when myocardium is deprived of oxygen Atherosclerosis in coronary arteries is the most common cause Ischemia- Decreased blood supply to a body organ or part often marked by  pain and organ dysfunction

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