![]() The arrhythmia often originates from left atrial myocytes which extend as sleeves around the pulmonary veins. ![]() Pathophysiology of atrial fibrillationĪF is a type of supraventricular cardiac arrhythmia meaning the origin of the arrhythmia arises from above the ventricles. 3įor more information, see the Geeky Medics guide to the cardiac conduction system. The electrical conduction system of the heart. The AVN briefly delays the impulse which then travels through the Bundle of His, down the left and right bundle branches and finally to the Purkinje fibres resulting in ventricular contraction. The electrical impulses travel through the atria causing atrial contraction and to the atrioventricular node (AVN) which lies between the atria and ventricles. The sympathetic branch of the nervous system increases the rate of impulse generation from the SAN whereas the parasympathetic branch decreases the rate of impulse generation. The rate at which these impulses are generated is under the influence of the autonomic nervous system. You might also be interested in our medical flashcard collection which contains over 1000 flashcards that cover key medical topics.īefore understanding the pathophysiology of AF, it is important to understand the normal cardiac conduction system.Ĭardiac electrical impulses are first generated in the sinoatrial node (SAN) which is found in the right atrium.
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