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Chapter 20 (Heart): Part 1

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  • Coronary Circulation

    supplies blood to the muscle tissues of the heart

  • Coronary Arteries

    Carry blood to the heart to provide it with oxygen

  • When does blood enter the coronary arteries?

    When the L. ventricle is relaxed

  • Coronary Sinus

    returns blood in the large vein back to the R. atrium to become oxygenated

  • What is CAD (Coronary Artery Disease)

    partial or complete blockage of the coronary arteries due to coronary ischemia which reduces cardiac performance;

    caused by atherosclerotic plaques

  • Coronary Ischemia

    reduction of blood flow leads to inadequate perfusion

  • Angina Pectoris

    The symptoms of CAD:

    sensation of pressure, chest constriction, and pain

  • Myocardial Infarction/Heart Attack

    part of the coronary circulation is blocked and cardiac muscle cells die from lack of oxygen;

    results from severe CAD and Coronary Thrombosis

    25% die before getting help

    65% under 50 die in the first hour

  • Coronary Thrombosis

    Thrombus/clot formation at the plaque, which obstructs the vessel

  • What are the treatments of CAD and MI

    Aspirin and Coumadin (reduce clotting)

    Noninvasive Surgery, like CABG (Coronary Artery Bypass Graft) where a vessel is grafted to create a detour around an obstructed artery