Basic Arrhythmia Review Guide 2018 Page 2 CARDIAC OUTPUT THE

Basic arrhythmia review guide 2018 page 2 cardiac

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Basic Arrhythmia Review Guide Advanced 02-07-2018 Page | 2 CARDIAC OUTPUT THE HEART RATE (HR) is the number of heartbeats in a minute. The stroke volume (SV) refers to the amount of blood pumped out of the heart with each contraction or beat. This averages about 70 mL with each beat. CARDIAC OUTPUT (CO) is the amount of blood pumped by the heart in a minute. SV x HR = CO BLOOD SUPPLY TO THE MYOCARDIUM The right coronary artery supplies oxygenated blood to the right side of the heart. The left coronary artery supplies oxygenated blood to the left side of the heart. PROPERTIES OF CARDIAC CELLS The muscle cells of the heart are unique and responsible for the electrical stimulation that leads to proper mechanical function. Myocardial cells have several different electrophysiological properties: automaticity, excitability, conductivity, contractility. ELECTRICAL CONDUCTION SYSTEM The components of the cardiac electrical conduction system transmit the electrical impulses initiated by the SA node ( the main pacemaker ) through the Atria, AV node / JUNCTIONAL tissue, BUNDLE OF HIS , RIGHT AND LEFT BUNDLE BRANCHES , and PURKINJE FIBERS . AV Node SA Node Atrial Tracts Bundle of HIS Left Bundle Branch Purkinje Fibers Right Bundle Branch
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