Which electrolyte imbalance is most likely indicated by a peaked T wave on an ECG?

Hyperkalemia

Hypocalcemia

Hyponatremia

Hypomagnesemia

Answer and Explanation

The Correct Answer is A

Rationale:
A tall, peaked T wave on an ECG is a classic sign of elevated potassium levels, which can progress to life-threatening arrhythmias if untreated.
B. Hypocalcemia is incorrect; it is associated with prolonged QT intervals and tetany, not peaked T waves.
C. Hyponatremia is incorrect; it typically causes neurologic symptoms (confusion, seizures) rather than characteristic ECG changes.
D. Hypomagnesemia is incorrect; it can cause prolonged QT and torsades de pointes, but not peaked T waves.

Nursing Test Bank

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Correct Answer is B

Explanation

Rationale:
A. High-fiber foods are beneficial for bowel regularity and should not be decreased.
B. Excessive or chronic use of stimulant laxatives like bisacodyl can lead to electrolyte imbalances, dehydration, and dependence.
C. While rectal irritation is possible, electrolyte imbalance is the more significant risk.
D. Irregular bowel movements are common and not necessarily indicative of poor intestinal health.

A. Vital signs on admission and every 4 hr B. NPO C. Complete blood count D. Basic metabolic profile E. Arterial blood gases F. Hemoccult stool G. Stool culture and sensitivity H. Urine culture and sensitivity I. Sitz baths up to 3 times daily PRN J. Dextrose 5% in 0.45% sodium chloride IV at 125 mL/hr K. Metoclopramide 10 mg IV every 6 hr PRN nausea/vomiting L. Ciprofloxacin 400 mg IV every 12 hr

Correct Answer is ["A","B","J"]

Explanation

Rationale

Vital signs on admission and every 4 hr → establish baseline and monitor for instability.
NPO → prevent worsening GI distress and prepare for possible procedures.
Dextrose 5% in 0.45% sodium chloride IV at 125 mL/hr → correct fluid volume deficit and dehydration.

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Which electrolyte imbalance is most likely indicated by a peaked T wave on an ECG?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is caring for an older adult client who reports taking bisacodyl tablets daily. Which of the following responses should the nurse make?

Correct Answer is B

Explanation

Correct Answer is ["A","B","J"]

Explanation

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