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• W3157577881 abstract "Abstract Background: Magnesium plays a vital role in calcium homeostasis. Magnesium sulfate is used in obstetric populations for the management of preeclampsia and eclampsia. Hypocalcemia secondary to iatrogenic hypermagnesemia is an uncommon complication. We report a case of symptomatic hypocalcemia due to hypermagnesemia. Clinical Case: A 26-year-old female with type 1 diabetes at 33 weeks gestation was admitted for preeclampsia. She had severe hypertension and proteinuria, and the decision to induce labor was made. She was started on a magnesium sulfate drip and remained on the drip for 33 hours. Magnesium levels peaked at 7.5 mg/dL (1.7–2.5 mg/dL). The magnesium drip was suspended after delivery. She complained of mild tingling and numbness in her hands, feet, and perioral area. Shortly after delivery, she had a pre-syncopal event. The laboratory evaluation revealed a calcium of 5.9 mg/dL (8.4–10.4) with an albumin of 2.2 g/dL (3.7–5.5), magnesium of 4.2 mg/dL, phosphorus 2.2 mg/dL (2.3–4.6) and GFR above 60 mL/min/1.73m2 . Spot urine calcium to creatinine ratio was 0.17 mg/dL. The 25-hydroxy vitamin D level was low at 12 ng/mL (20–100). The parathyroid hormone (PTH) level was inappropriately normal at 21.7 pg/mL (12–88). She had no history of hypocalcemia, and calcium level obtained six months before the presentation was normal. She received one calcium gluconate infusion, was then started on a continuous calcium gluconate infusion for symptomatic hypocalcemia. She also received oral supplementation of calcium and vitamin D. The calcium levels normalized within 24 hours as the hypermagnesemia resolved from the discontinuation of the magnesium drip. The subsequent PTH level was 38.8 pg/mL. She was discharged on vitamin D supplements. She had no recurrence of hypocalcemia. Conclusion: Our case highlights the effect of magnesium infusion on the parathyroid gland leading to profound symptomatic hypocalcemia. Magnesium plays an essential role in the secretion of PTH. Transient hypoparathyroidism can occur due to hypomagnesemia and hypermagnesemia (tocolytic therapy). In hypomagnesemia, the parathyroid gland secretes insufficient PTH, and the renal and skeletal response to PTH is reduced. In hypermagnesemia, the magnesium activates the extracellular calcium-sensing receptor, subsequently causing inhibition of the parathyroid gland. Amelioration of hypermagnesemia leads to the normalization of parathyroid function. Health care providers should be aware of this phenomenon, especially in the obstetric population receiving magnesium infusion. The monitoring of calcium levels may be necessary for this patient population. The laboratory testing should include magnesium in the evaluation of hypocalcemia. References: 1. Shoback, D. (2008). Hypoparathyroidism. New England Journal of Medicine, 359(4), 391–403." @default.
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• W3157577881 date "2021-05-01" @default.
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• W3157577881 title "The Unusual Suspect: Hypocalcemia in Preeclampsia After Magnesium Infusion" @default.
• W3157577881 doi "https://doi.org/10.1210/jendso/bvab048.461" @default.
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