The U wave on an ECG typically represents repolarization of which cardiac structure?

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Multiple Choice

The U wave on an ECG typically represents repolarization of which cardiac structure?

Explanation:
U waves come from late repolarization of the Purkinje fiber network. These specialized conducting fibers finish repolarizing after the main ventricular myocardium, producing a small afterwave that follows the T wave. Atrial myocardium repolarizes with the atrial cycle and doesn’t create a distinct afterwave after the T wave. The bundle of His and the ventricular septum are more about conduction and primary QRS formation, not late repolarization that shows up as a U wave. So the structure associated with the U wave is the Purkinje fibers.

U waves come from late repolarization of the Purkinje fiber network. These specialized conducting fibers finish repolarizing after the main ventricular myocardium, producing a small afterwave that follows the T wave. Atrial myocardium repolarizes with the atrial cycle and doesn’t create a distinct afterwave after the T wave. The bundle of His and the ventricular septum are more about conduction and primary QRS formation, not late repolarization that shows up as a U wave. So the structure associated with the U wave is the Purkinje fibers.

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