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Korean J Pediatr. 2011 Jul;54(7):310-2. doi: 10.3345/kjp.2011.54.7.310. Epub 2011 Jul 31.

Idiopathic severe hypermagnesemia in an extremely low birth weight infant on the first day of life.

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Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.


A preterm female infant born at 27 weeks of gestation with a birth weight of 990 g developed acute hypotonia, apnea, hypotension and bradycardia mimicking septic shock syndrome at 14h after birth. Laboratory tests indicated a severe hypermagnesemia of 45 mg/dL. The renal function, complete blood count and maternal blood concentrations of magnesium were normal, and the blood cultures were negative. The patient recovered with treatment including exchange transfusion. However, the etiology of the severe hypermagnesemia remains unknown.


Hypermagnesemia; Infant; Magnesium; Prematurity

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