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. The tubing for TPN must be changed every 24 hr (not 48 hr) to reduce the risk of central line–associated bloodstream infection (CLABSI).
B. Lipid emulsions should not hang for more than 12 hr to prevent bacterial growth and infection.
C. A 1.2-micron filter is required for TPN that contains lipids to remove particulate matter, bacteria, and fungi, since lipid solutions cannot pass through smaller filters.
D. TPN solutions should be changed every 24 hr (not 36 hr) to reduce infection risk.
Correct Answer is A
Explanation
Rationale:
A. Petechiae are small, red or purple spots caused by capillary bleeding and are common in advanced cirrhosis due to thrombocytopenia and coagulation defects.
B. Peripheral ulcers are not typically associated with cirrhosis.
C. Osteoarthritis is a degenerative joint condition unrelated to liver disease.
D. Hypertension is not a hallmark of advanced cirrhosis; portal hypertension may occur, but systemic hypertension is not expected.
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