Which electrolyte imbalance is most likely indicated by a peaked T wave on an ECG?
Hyperkalemia
Hypocalcemia
Hyponatremia
Hypomagnesemia
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
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale:
A. NG tube drainage usually leads to loss of gastric fluid, which is rich in hydrochloric acid and potassium, but sodium is not typically elevated.
B. Magnesium loss is minimal in gastric drainage; elevation is unlikely.
C. Gastric secretions contain large amounts of potassium, so prolonged NG suctioning can lead to hypokalemia, which increases the risk of muscle weakness, cardiac dysrhythmias, and fatigue.
D. Calcium loss is not a direct consequence of NG tube drainage.
Correct Answer is B
Explanation
Rationale:
A. Lactulose is usually administered orally to soften stools, not as a short-retention enema.
B. A Fleet enema is a hypertonic solution that draws fluid into the colon, is retained briefly, and promotes rapid evacuation of stool to relieve constipation.
C. Tap water enemas are hypotonic and typically require immediate expulsion, not short retention.
D. Mineral oil enemas are retention enemas, meant to soften stool over a longer period, not for rapid evacuation.
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