Which lab value would be most likely to cause the following dysrhythmia?

Ca 12

Mag 3.1

K+ 2.6

Mag 1.1

Answer and Explanation

The Correct Answer is D

A. Hypercalcemia (Calcium > 10.5 mg/dL) can lead to shortened QT intervals, not prolonged ones, and is unlikely to cause Torsades de Pointes.

B. A magnesium level of 3.1 mEq/L is slightly elevated and would not contribute to QT prolongation or Torsades de Pointes. In fact, magnesium supplementation is a treatment for this condition.

C. Hypokalemia (Potassium < 3.5 mEq/L) can prolong the QT interval and contribute to dysrhythmias, but it is less commonly a direct cause of Torsades de Pointes compared to hypomagnesemia. A potassium level of 2.6 mEq/L is low but would not typically result in Torsades without coexisting hypomagnesemia.

D. Hypomagnesemia (Magnesium < 1.5 mEq/L) disrupts the heart's electrical activity, prolonging the QT interval and increasing the risk of polymorphic ventricular tachycardia, like Torsades de Pointes. Magnesium is critical for stabilizing myocardial electrical conduction, and a value of 1.1 mEq/L indicates significant deficiency, consistent with this dysrhythmia.

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Correct Answer is A

Explanation

A. Clients with ICDs should avoid strong electromagnetic fields, which can interfere with the device’s function. This is crucial for safety.

B. Discontinuing antidysrhythmic medication is not recommended unless instructed by the healthcare provider, as it could increase the risk of arrhythmias.

C. Strenuous exercise may be too strenuous for someone with an ICD and could increase the risk of arrhythmias or lead to ICD activation.

D. A snug-fitting shirt is generally not recommended because it may place pressure on the ICD site and cause discomfort.

A. Tell the student to stop playing immediately if any dyspnea occurs. B. Refer the student to a cardiologist for further diagnostic testing. C. Allow the student to participate on the soccer team. D. Obtain more detailed information about the student's family health history.

Correct Answer is C

Explanation

A. It is appropriate to monitor for symptoms of bradycardia, but the student is currently asymptomatic.

B. Referral to a cardiologist is not necessary unless the student develops symptoms or other concerning signs.

C. Sinus bradycardia can be normal in young, healthy athletes, especially those who engage in regular physical activity. Since the student is asymptomatic, with no signs of dyspnea, chest pain, or other concerning symptoms, there is no reason to restrict participation in sports.

D. Family history may be helpful, but this is not the immediate priority when the student is asymptomatic.

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Which lab value would be most likely to cause the following dysrhythmia?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

After teaching a client who has an implantable cardioverter- defibrillator (ICD), a nurse assesses the client's understanding. Which statement by the client indicates correct understanding of the teaching?

Correct Answer is A

Explanation

A 20-year-old has a mandatory electrocardiogram (ECG) before participating on a college soccer team and is found to have sinus bradycardia, rate 52. The students blood pressure is 119/76 and denies any health issues. Which action by the nurse is most appropriate?

Correct Answer is C

Explanation

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