A patient is diagnosed with hypermagnesemia. Which of the following will the nurse most likely assess on this patient's electrocardiogram tracing?
1. prominent U waves and flattened T waves
2. short QT interval
3. wide QRS complex and tall peaked T waves
4. prolonged QT interval
3
Rationale: Increased levels of magnesium can produce a prolonged PR interval, wide QRS complexes, bradycardia; and tall, peaked T waves. Decreased levels of magnesium increase the irritability of the nervous system and can produce prominent U waves and a flattened T wave. Hypercalcemia can produce a shortened QT interval. Hypocalcemia can produce a prolonged QT interval.
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A) Chordae tendineae B) Ventricles C) Semilunar valves D) Precordium