The nurse is caring for a patient whose atria do not contract correctly. The nurse would expect this dysfunction to be apparent in which part of the ECG complex?
1. The P wave
2. The U wave
3. The QRS
4. The T wave
1
Rationale 1: The P wave represents the depolarization and contraction of the atria.
Rationale 2: A U wave is not present in everyone's ECG. It occurs with potassium imbalance and is not associated with the atria.
Rationale 3: The QRS represents the conduction of the electrical impulse from the bundle of His to the ventricles.
Rationale 4: The T wave represents the repolarization of the ventricles. It is not associated with the atria.
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