A nurse is caring for a client who has a serum potassium level of 5.5 mEq/L. The provider prescribes polystyrene sulfonate. If this medication is effective, the nurse should expect which of the following changes on the client's ECG?
Restoration of QRS Complex amplitude.
Shortening of P-wave duration.
Widening of the QRS complex.
Reduction of T-wave amplitude.
The Correct Answer is D
The correct answer is choice D: Reduction of T-wave amplitude.
Choice A rationale:
The amplitude of the QRS complex is not directly affected by changes in serum potassium levels. It represents ventricular depolarization, and its restoration would not be an expected outcome of polystyrene sulfonate treatment
Choice B rationale:
Shortening of the P-wave duration is not an expected change with polystyrene sulfonate treatment. The P-wave represents atrial depolarization, which is not significantly impacted by the administration of this medication
Choice C rationale:
Widening of the QRS complex is associated with high serum potassium levels. The goal of polystyrene sulfonate treatment is to lower potassium levels and, thus, return the QRS complex to its normal width
Choice D rationale:
Polystyrene sulfonate aims to reduce serum potassium levels. When effective, this should result in a reduction of T-wave amplitude, which is a common ECG change seen with hyperkalemia
In conclusion, choice D is the correct answer, as a reduction in T-wave amplitude would be the expected change on the client's ECG if polystyrene sulfonate effectively lowers their serum potassium level.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","C"]
Explanation
Choice A rationale:
The nurse considered contraction of facial muscles as a finding of hypocalcemia because it is associated with Chvostek's sign, which indicates neuromuscular irritability due to low calcium levels.
Choice B rationale:
Complaints of fingers tingling are indicative of hypocalcemia since tingling sensations (paresthesias) in the extremities can result from decreased calcium levels affecting nerve function.
Choice C rationale:
Carpal spasm with blood pressure measurement is known as Trousseau's sign and is associated with hypocalcemia. When the blood pressure cuff is inflated above systolic pressure, it can cause tetany in the hand if the calcium levels are low.
Choice D rationale:
Asking when foot numbness would go away does not directly relate to hypocalcemia or its symptoms. It is not a finding used to come to the conclusion of hypocalcemia in this scenario.
Choice E rationale:
The heart rate being 88 and regular does not directly indicate hypocalcemia. While hypocalcemia can lead to cardiac arrhythmias, a heart rate of 88 and regular is within the normal range and not a specific finding for hypocalcemia.
Correct Answer is B
Explanation
The correct answer is choice B) Administering sodium polystyrene sulfonate.
Choice A rationale:
Administering a potassium-sparing diuretic is not appropriate for a client with hyperkalemia (high potassium levels). Potassium-sparing diuretics would further increase potassium levels, worsening the condition.
Choice B rationale:
Sodium polystyrene sulfonate is used to treat hyperkalemia. It works by exchanging sodium ions for potassium ions in the intestines, which helps to lower serum potassium levels by excreting it through the stool.
Choice C rationale:
Initiating an IV potassium infusion would be contraindicated in this situation as it would increase the already elevated potassium levels, potentially leading to dangerous cardiac complications.
Choice D rationale:
Encouraging the client to eat bananas is not advisable because bananas are high in potassium, which would exacerbate hyperkalemia.
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