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Fatal Hypermagnesemia in Patients Taking Magnesium Hydroxide
( Da Hye Jou ),( Su In Kim ),( In Hong Choi ),( Su Hyun Song ),( Tae Ryom Oh ),( Sang Heon Suh ),( Hong Sang Choi ),( Chang Seong Kim ),( Soo Wan Kim ),( Eun Hui Bae ),( Seong Kwon Ma ) 대한전해질학회 2023 Electrolytes & Blood Pressure Vol.21 No.2
Hypermagnesemia is a rare but potentially fatal electrolyte disorder often overlooked because of its unfamiliarity. Magnesium is regulated through a balance of bone, intestinal absorption, and renal excretion. Hypermagnesemia typically arises from excessive magnesium intake or reduced renal excretion; however, it also occurs in patients with normal kidney function. Herein, we report two cases of hypermagnesemia in patients taking magnesium hydroxide for constipation. The first case involved an 82-year-old woman with end-stage renal disease who developed metabolic encephalopathy due to hypermagnesemia, after taking 3,000mg of magnesium hydroxide daily for constipation. Her magnesium level was 9.9mg/dL. Her treatment involved discontinuing magnesium hydroxide and continuing hemodialysis, which led to her recovery. In the second case, a 50-year-old woman with a history of cerebral hemorrhage and mental retardation developed hypermagnesemia despite having normal renal function. She was also taking magnesium hydroxide for constipation, and her magnesium level was 11.0mg/dL. She experienced cardiac arrest while preparing for continuous renal replacement therapy (CRRT). After achieving return of spontaneous circulation, CRRT was initiated, and her magnesium level showed a decreasing trend. However, vital signs and lactate levels did not recover, leading to death. These cases highlight the importance of prompt diagnosis and intervention for hypermagnesemia and the need to regularly monitor magnesium levels in individuals receiving magnesium-containing preparations, especially those with impaired kidney function.