A patient with history of Graves’ disease is admitted to the…

A patient with history of Graves’ disease is admitted to the unit with shortness of breath.  The nurse assesses vital signs to be BP 160/80, HR 150 beats/min, respirations 24/min, and temperature 103 degrees F.  The patient also complains of nausea and vomiting.  The nurse suspects the client has which medical emergency?