Which lab value would be most likely to cause the following dysrhythmia?
Ca 12
Mag 3.1
K+ 2.6
Mag 1.1
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Although monitoring hemodynamic parameters is important, this option does not address the immediate issue of low preload, as indicated by the low CVP and PAWP, suggesting hypovolemia.
B. Furosemide is a diuretic and would further decrease intravascular volume, which is inappropriate given the signs of hypovolemia.
C. Decreasing IV fluids would exacerbate the low preload and worsen the client's condition by reducing intravascular volume even further.
D. Administering 0.9% Normal Saline @ 150 mL/hr is the most appropriate intervention. The low CVP and PAWP indicate hypovolemia, and increasing fluid administration will help to increase the preload, thereby improving the client's hemodynamic status.
Correct Answer is C
Explanation
A. Using a feminine pad at night instead of a tampon can reduce the risk of TSS, which is correct.
B. Not using tampons reduces the risk of TSS. This statement is correct.
C. Tampons should be changed every 4 to 8 hours, not 10 hours, to reduce the risk of TSS. This statement indicates a lack of understanding.
D. Hand hygiene before inserting a tampon is critical for preventing TSS. This statement is correct.
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