A nurse is reviewing the laboratory results of a client who received a dose of sodium polystyrene sulfonate. Which of the following labs should the nurse monitor to evaluate if the medication has been effective?
Calcium
Potassium
Sodium
Magnesium
The Correct Answer is B
Sodium polystyrene sulfonate is a cation-exchange resin utilized in the management of hyperkalemia. It works in the large intestine by exchanging sodium ions for potassium ions, allowing the excess potassium to be excreted from the body via the feces to prevent cardiac complications.
Rationale:
A. While sodium polystyrene sulfonate can lead to a secondary decrease in calcium levels as a side effect, calcium is not the target of the medication. Monitoring calcium is important for safety, but it does not measure the primary effectiveness of the drug. The drug is specifically formulated to treat potassium imbalances that pose immediate risks to the myocardium.
B. Potassium is the primary laboratory value to monitor because the therapeutic goal of sodium polystyrene sulfonate is to lower serum potassium levels. Effectiveness is confirmed when the lab results show a return toward the normal range of 3.5 to 5.0 mEq/L. Since high potassium can cause fatal arrhythmias, this lab provides the definitive proof of the medication's clinical success.
C. Sodium levels may increase during therapy because the resin releases sodium in exchange for potassium, but this is a side effect rather than a measure of efficacy. Monitoring sodium is necessary to prevent hypernatremia and fluid retention, especially in heart failure patients. However, the nurse prioritizes the potassium level to ensure the life-threatening hyperkalemia has been resolved.
D. Magnesium levels are not the primary focus for evaluating the effectiveness of this exchange resin. While electrolyte shifts can occur broadly during diuresis or bowel clear-out, sodium polystyrene sulfonate has a specific affinity for potassium. The nurse should monitor magnesium for general electrolyte balance, but it does not serve as a benchmark for the medication's intended therapeutic action.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A medication error is an adverse eventthat necessitates immediate clinical and administrative action to ensure patient safety. The primary goal following an error is to assess the client for physiological instabilityand implement corrective treatments. Transparent communicationwith the healthcare team is essential for mitigating harm and documenting the event for future quality improvement initiatives.
Rationale:
A.The nursing supervisor should be notified as part of the facility's internal administrative process, but this is not the most immediate priority. While the supervisor oversees the unit's safety protocols, they cannot provide the medical orders necessary to treat a potential adverse reaction. Administrative notification should follow the clinical notification of the primary healthcare provider to ensure the patient's immediate health.
B.Agency administration is typically notified through the formal filing of an incident report once the patient is stable and immediate care has been coordinated. The administration uses this data for risk management and system-wide improvements rather than direct clinical intervention. Therefore, reporting to this department first would inappropriately delay the necessary medical assessment of the affected client.
C.The client's provider must be notified first so they can evaluate the clinical impact of the error and prescribe any necessary antidotes or monitoring. Immediate medical assessment is the highest priority to ensure the patient does not suffer from toxic effects or therapeutic failure. The provider is responsible for determining the next steps in the client's medical management plan.
Correct Answer is B
Explanation
Enoxaparin is a low-molecular-weight heparin(LMWH) that exerts anticoagulant effects by accelerating the activity of antithrombin III, primarily inhibiting factor Xa. It is used for the prophylaxis and treatment of deep vein thrombosisand pulmonary embolism. Unlike unfractionated heparin, it has a more predictable pharmacological profile and typically does not require routine laboratory monitoring of clotting times.
Rationale:
A.Diarrhea is not a common or expected side effect of enoxaparin therapy, as the drug does not significantly affect the gastrointestinal microbiome. The most concerning side effects are related to bleeding or heparin-induced thrombocytopenia. If a patient experiences diarrhea, the nurse should investigate other causes such as dietary changes, infections, or different medications.
B.Monitoring the skin for bruising is a vital safety instruction because enoxaparin increases the risk of bleeding and hemorrhage. Bruising or ecchymosis can indicate that the medication is excessively thinning the blood or that the patient has experienced minor trauma. Early detection of bleeding allows for prompt medical intervention to adjust the dosage or manage complications.
C.Enoxaparin must be injected into the subcutaneous tissue, typically in the abdomen, and should never be injected into a muscle. Intramuscular injection of anticoagulants can cause the formation of painful and dangerous hematomas due to the high vascularity of muscle tissue. The nurse must ensure the client understands the correct technique for deep subcutaneous administration.
D.Weekly INR checks are required for patients taking warfarin, but they are not necessary for those on enoxaparin. Enoxaparin provides a very stable and predictable anticoagulant response that does not require the frequent dose adjustments associated with Vitamin K antagonists. This lack of required blood work is one of the primary benefits of LMWH therapy.
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