A 56-Year-Old Man Is Brought to the Emergency Department Due

A 56-year-old man is brought to the emergency department due to progressive weakness and lethargy.  The patient has also had a nonproductive cough for the past several weeks.  He has no prior medical conditions and takes no medications.  He has smoked a pack of cigarettes daily for 30 years.  Physical examination shows no abnormalities.  Chest x-ray reveals a lung mass.  Further evaluation reveals an electrolyte abnormality induced by ectopic antidiuretic hormone production from a lung mass.  This patient is at greatest risk of which of the following conditions if his electrolyte abnormality is corrected too quickly?

A) Cardiac arrhythmias
B) Cerebral demyelination
C) Cerebral edema
D) Diffuse myonecrosis
E) Intravascular hemolysis

Correct Answer:

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