Which wave may appear on an ECG but is not always present?

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Multiple Choice

Which wave may appear on an ECG but is not always present?

Explanation:
The wave that may appear on an ECG but is not always present is the U wave. It’s a small deflection that follows the T wave and represents late ventricular repolarization. Its exact origin isn’t seen in every heart, and in many tracings it’s too small to notice, especially at faster heart rates. You’ll often see it more clearly when the heart rate is slow or in conditions that affect repolarization, such as low potassium. Because it isn’t required for a normal heartbeat tracing, its absence doesn’t indicate a problem, but when it’s present, it can provide a clue about the heart’s repolarization dynamics or electrolyte status.

The wave that may appear on an ECG but is not always present is the U wave. It’s a small deflection that follows the T wave and represents late ventricular repolarization. Its exact origin isn’t seen in every heart, and in many tracings it’s too small to notice, especially at faster heart rates. You’ll often see it more clearly when the heart rate is slow or in conditions that affect repolarization, such as low potassium. Because it isn’t required for a normal heartbeat tracing, its absence doesn’t indicate a problem, but when it’s present, it can provide a clue about the heart’s repolarization dynamics or electrolyte status.

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