摘要：

We present a case of hypermagnesemia accompanied by perforative peritonitis. A 79-year-old woman took magnesium citrate as part of the pretreatment on the day before a scheduled colonoscopy. She developed nausea and muscle weakness, and she was complaining of left abdominal pain. Consciousness gradually worsened and she developed shock. Intestinal obstruction was recognized on abdominal X-ray and computed tomography (CT), and peritonitis was suspected. An exploratory laparotomy was scheduled for diagnosis and treatment. In the operating room, arterial blood gas analysis showed metabolic acidosis and hypermagnesemia (Mg: 2.75 mmol/l, normal range: 0.1–5 mmol/l). On laparotomy, adhesion around the sigmoid colon and turbid ascites were recognized. But we could not detect the apparent region of perforation. Based on these findings and the presence of hypermagnesemia, we diagnosed that the shock was caused

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