Hypermagnesemia (6.95 mmol/l) and respiratory arrest occurred to a 20-year-
old female (G3P2002) at 26 weeks of gestation during tocolytic treatment wi
th MgSO4. 7H(2)O (density greater than plasmalyte) injected into an IN. inf
usion bag containing 1 1 of plasmalyte without mixing. The patient was resc
ued with calcium gluconate and normal pregnancy continued. It is important
to adequately mix an I.V. solution after adding a drug particularly when th
e drug-containing solution has greater density than the parent I.V. solutio
n. (C) 1999 Elsevier Science B.V. All rights reserved.