A 34-year-old G1P0 woman at 37 weeks of gestation is currently hospitalized and receiving … — USMLE Step 2 CK

A 34-year-old G1P0 woman at $37$ weeks of gestation is currently hospitalized and receiving an intravenous magnesium sulfate infusion for the management of severe preeclampsia. During a routine clinical assessment, the nurse notes that the patient has become increasingly somnolent and difficult to arouse. Her vital signs show a blood pressure of $152/98\text{ mmHg}$ , a heart rate of $88\text{ /min}$ , a respiratory rate of $8\text{ /min}$ , and an oxygen saturation of $86\%$ on room air. Continuous fetal heart rate monitoring demonstrates a baseline of $130\text{ /min}$ with minimal variability and no decelerations. Neurological examination reveals bilaterally absent patellar reflexes. Urine output has been $40\text{ mL}$ over the last $4$ hours. Arrange the following acute management steps in the most appropriate chronological sequence for this patient.

1Halt the continuous intravenous magnesium sulfate infusion.
2Apply supplemental oxygen and initiate positive pressure ventilation.
3Administer an intravenous dose of calcium gluconate.
4Draw blood for serum magnesium levels and a basic metabolic panel.

Cevap

The correct sequence for managing acute magnesium toxicity is to first halt the magnesium infusion, followed by securing the airway and providing ventilatory support, then administering intravenous calcium gluconate, and finally obtaining serum laboratory studies.

The established resuscitation algorithm for severe magnesium toxicity prioritizes removing the source (stopping the infusion) and securing the patient's ABCs (airway, breathing, circulation) before administering specific pharmacological antidotes or obtaining diagnostic labs. Hypoxia from respiratory failure will cause irreversible harm if the airway is not secured prior to or simultaneously with drawing labs and giving calcium.

Adım Adım Çözüm

Identify the clinical presentation of magnesium toxicity.

The patient exhibits profound somnolence, respiratory depression, absent reflexes, and oliguria.

Recognizing the signs of toxicity is required before initiating the specific treatment sequence.

Determine the first priority in toxicological emergencies.

Halt the continuous intravenous magnesium sulfate infusion.

Removing the offending agent is the most direct way to prevent further physiological deterioration.

Address acute life-threatening complications.

Apply supplemental oxygen and initiate positive pressure ventilation.

Respiratory failure is the most immediate cause of morbidity and mortality in severe hypermagnesemia; securing the ABCs is paramount.

Administer the specific pharmacological antidote.

Administer an intravenous dose of calcium gluconate.

Calcium acts as a direct antagonist to magnesium at the neuromuscular junction, reversing the blockade and restoring respiratory drive.

Perform diagnostic and monitoring evaluations.

Draw blood for serum magnesium levels and a basic metabolic panel.

Laboratory values confirm the diagnosis and assess renal clearance, but this diagnostic step should never delay active resuscitation.

Anahtar Kavram

The acute management of magnesium toxicity requires strict sequential prioritization: immediately stopping the infusion, ensuring airway and breathing stability, administering calcium gluconate, and finally obtaining subsequent laboratory studies.

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