A 67-year-old, male patient with a history of heart failure is on the unit and is having episodes of vomiting and diarrhea. His serum potassium level is 3.2 mg/dL. He also says that he has been experiencing vision problems for the past few hours, saying, "I see weird yellow halos when I look at any light! It's like angels are all around me!" What is the most likely cause of the symptoms he is experiencing?
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