Download e-book for iPad: Cardiac nursing by Susan L Woods; et al

By Susan L Woods; et al

ISBN-10: 0781792800

ISBN-13: 9780781792806

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There are between one and four obtuse marginal branches. These branches vary greatly in size. They run along the ventricular wall laterally and posteriorly, toward the apex, along the obtuse margin of the heart. The marginal branches supply the obtuse margin of the heart and the adjacent posterior wall of the left ventricle above the diaphragmatic surface. 31 These branches originate in the terminal portion of the circumflex artery and course caudally and to the left on the posterior left ventricular wall, supplying the posterior and diaphragmatic wall of the left ventricle.

It runs centrally in the angle formed by the left posterior AV groove and the posterior interventricular sulcus. It perfuses the diaphragmatic aspect of the left ventricle. A left atrial branch may course in the posterior left AV groove, perfusing the left atrium. Left Coronary Artery The left main coronary artery arises from the aorta in the ostium behind the left cusp of the aortic valve. This artery passes between the left atrial appendage and the pulmonary artery. Typically, it then divides into two major branches: the left anterior descending artery and left circumflex artery.

Changes in the internal or external milieu may modify channel gating. Also, there can be timedependent effects. For example, a small depolarization opens the sodium channel; it closes after a few milliseconds. An important channel characteristic is its ability to allow passage of some ions while excluding others. This is called selective permeability. A theoretical model of an ionic channel is given in Figure 1-16. The sodium channel is common in excitable cells and has been well characterized.

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Cardiac nursing by Susan L Woods; et al

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