A parturient who is 38 weeks’ gestation with severe signs an…

A parturient who is 38 weeks’ gestation with severe signs and symptoms of preeclampsia has been on a magnesium infusion of 2 g/h for the past 12 hours. The patient calls the nurse to complain of chest pain and tightness, palpitations, blurred vision, and is complaining of leg weakness. Shortly after the patient goes apneic and becomes unresponsive. What intervention by the anesthesia provider is MOST important at this time?