Q: Magnesium sulfate should be infused with caution in which of the following patients

A) Myasthenia gravis
B) Asthma
C) Hypocalcemia
D) Hypokalemia
E) Torsade de pointes 


Answer:  A

Magnesium sulfate infusion should be used with caution in patients with myasthenia gravis since it can precipitate a severe myasthenia crisis. Magnesium is indicated in all other cases given in the question.



Reference:

Paramveer Singh, MD, Olakunle Idowu, MD, Imrana Malik, MD, and Joseph L. Nates, MD, MBA - Acute Respiratory Failure Induced by Magnesium Replacement in a 62-Year-Old Woman with Myasthenia Gravis - Tex Heart Inst J. 2015 Oct; 42(5): 495–497.