Correct Answer: C

Rationale: In cases of magnesium sulfate toxicity, calcium gluconate is the antidote as it helps reverse the effects. Positioning the client supine (Choice A) may not directly address magnesium sulfate toxicity. Administering dextrose 5% (Choice B) is not the correct intervention for magnesium sulfate toxicity. Methylergonovine IM (Choice D) is used to manage postpartum hemorrhage, not magnesium sulfate toxicity.

Correct Answer: C

Rationale: The correct answer is C: 'This medication will decrease swelling and mucus production.' Montelukast is a leukotriene receptor antagonist that works by reducing swelling and mucus production in the airways, helping to manage asthma symptoms in the long term. Choices A, B, and D are incorrect because montelukast is not used for immediate relief during asthma attacks, pre-exercise prophylaxis, or short-term treatment; instead, it is taken regularly for asthma control.

Correct Answer: B

Rationale: The correct answer is B. A PaCO2 level of 55 mm Hg is elevated, indicating carbon dioxide retention, a common complication of emphysema that necessitates intervention. Elevated PaCO2 can lead to respiratory acidosis, reflecting inadequate ventilation. Choices A, C, and D are within normal ranges. A PaO2 level of 89 mm Hg is acceptable. An HCO3 level of 25 mEq/L falls within the normal range, suggesting adequate compensation. A pH level of 7.37 is also within the normal range, indicating the client's acid-base balance is maintained.

Correct Answer: B

Rationale: In this scenario, the correct answer is B: Hemorrhage. Fullness in the throat post-thyroidectomy can indicate postoperative bleeding, a critical complication that requires immediate assessment and intervention. Choice A, Hypocalcemia, is incorrect because it does not typically present with fullness in the throat. Choice C, Hypoxia, is not directly related to the symptom described and is not the primary concern in this situation. Choice D, Hypothyroidism, is also incorrect as it is a long-term condition and unlikely to manifest suddenly 4 hours postoperatively with throat fullness.

Correct Answer: C

Rationale: When toxicity from magnesium sulfate occurs, the nurse should administer calcium gluconate IV as it is the antidote for magnesium sulfate toxicity. Positioning the client supine may not address the toxicity issue. Administering dextrose 5% is not the appropriate intervention for magnesium sulfate toxicity. Methylergonovine is used to manage postpartum hemorrhage and is not indicated for magnesium sulfate toxicity.