The nurse is teaching a group of staff nurses about cardiac rhythms. The nurse would indicate that a U wave may indicate which of the following?

Hypokalemia

Hypercalcemia

Hyponatremia

Hyperkalemia

Answer and Explanation

The Correct Answer is A

A. Hypokalemia: U waves are often seen on an electrocardiogram in clients with hypokalemia. They represent delayed repolarization of the Purkinje fibers due to low potassium levels.

B. Hypercalcemia: Hypercalcemia affects the QT interval, typically shortening it, but it does not cause U waves.

C. Hyponatremia: Electrocardiographic changes are not commonly associated with hyponatremia.

D. Hyperkalemia: Hyperkalemia causes peaked T waves, prolonged PR intervals, and wide QRS complexes, not U waves.

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Correct Answer is B

Explanation

A. Complete (third-degree) heart block: This rhythm is characterized by a lack of relationship between P waves and QRS complexes, indicating a complete dissociation between atrial and ventricular activity.

B. A pacemaker rhythm on an ECG is characterized by the presence of pacing spikes followed by P waves or QRS complexes, depending on whether the pacemaker is pacing the atrium or the ventricle. If the pacemaker is pacing the ventricle, the pacing spike will be followed by a QRS complex. The QRS complexes in a paced rhythm are often wider than normal.

C. Sinus bradycardia: Sinus bradycardia is a slow but regular rhythm originating from the sinus node, with normal P waves and QRS complexes.

D. First-degree heart block: First-degree heart block is characterized by a prolonged PR interval (greater than 0.20 seconds) but with all P waves followed by QRS complexes, differing from third-degree heart block.

A. Congenital valve abnormalities B. Rheumatic fever C. Autoimmune deficiency syndrome D. Degenerative calcification of valve

Correct Answer is B

Explanation

A. Congenital valve abnormalities: Although congenital heart defects can cause aortic stenosis, rheumatic fever is a more common cause in adults.

B. Rheumatic fever: Rheumatic fever is the most common cause of aortic stenosis in adults, as it can lead to scarring and narrowing of the aortic valve.

C. Autoimmune deficiency syndrome: This is not associated with aortic stenosis.

D. Degenerative calcification of valve: This is a common cause of aortic stenosis in older adults, but it is generally less common than rheumatic fever as the primary cause in a younger or middle-aged population.

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The nurse is teaching a group of staff nurses about cardiac rhythms. The nurse would indicate that a U wave may indicate which of the following?

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