The nurse is caring for a 37 week gestation, G2 P1 client wi…

The nurse is caring for a 37 week gestation, G2 P1 client with Preeclampsia. The client has just been started on magnesium sulfate at 2g/hr.  BP is 198/102, P 96, R 16, Temp 99.0 and DTR’s are 3+.  The client suddenly complains of severe abdominal pain.  The nurse assesses the client and notes a board-like abdomen on palpation and no vaginal bleeding.  FH strip shows a prolonged deceleration.  The nurse knows that these s/s are indicative of what medical emergency?