ISSN: 1305-385X
Hakkında: Özel sayılar şeklinde yayınlanır.
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Anatomy And Physiology Of Normal Cardiac Rhythm
Dr. Ümit GÜRAY,a Dr. Şule KORKMAZa
aKardiyoloji Kliniği, Ankara Yüksek İhtisas Hastanesi, ANKARA
Under normal conditions, myocardial contractile cells are not capable of impulse formation and conduction. Specialized cardiac pacemaker cells located in certain locations in heart are responsible for these functions. Formation of normal cardiac electrical impulse is occurred in the sinoatrial node which is situated in superior and posterior right atrium. It then spreads out in concentric waves throughout the right atrium, reaching the left atrium and the atrioventricular (AV) node. AV node is situated just above the interventricular septum. Impulse is slowed down in this location and then spreads out in a quicker fashion to the His bundle, the ventricular fascicules and the Purkinje fibers. Final ramifications of these fibers are connected to the contractile myocardial cells. Impulse formation and conduction of myocardial conduction system are under strict control of autonomic nervous system. In this review, anatomy and function of cardiac conduction system are summarized.Keywords: Cardiac conduction system, anatomy, cardiac impulse formation, cardiac action potentialTurkiye Klinikleri J Int Med Sci 2006, 2(33):4-8
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