![]() ![]() This allows for any location along the tract to spontaneously depolarize, hence different locations that are responsible for each heartbeat. Over time, the extension of tissue becomes a tract with spontaneous depolarization capability. Therefore, the mechanism is by extension of the self-depolarizing tissue between the SA and AV node. However, the atrial muscle tissue isn't able to spontaneously depolarize. ![]() Originally, it was believed that the atria had different ectopic foci that were spontaneously depolarizing, each foci acting as a pacemaker for the heart. The atrial and ventricular muscle tissue do not have this capability. This is unusual because the SA node, AV node, bundle of His, bundle branches, and Purkinje fibers are the structures that have pacemaking capability. In wandering atrial pacemaker, there are other locations within the atria besides the SA node that are responsible for each heartbeat. The SA node is considered the primary pacemaker of the heart. Diagnosis of wandering atrial pacemaker is made by an ECG. It is often seen in the young, the old, and in athletes, and rarely causes symptoms or requires treatment. Causes of wandering atrial pacemaker are unclear, but there may be factors leading to its development. This is different from normal pacemaking activity, where the sinoatrial node (SA node) is responsible for each heartbeat and keeps a steady rate and rhythm. Wandering atrial pacemaker ( WAP) is an atrial rhythm where the pacemaking activity of the heart originates from different locations within the atria. Medical condition Wandering atrial pacemakerĮCG showing differing P-wave morphologies ![]()
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