Apatientâs 12-lead ecg is transmitted by the paramedics and shows a stemi. when the patient arrives in the emergency department, the rhythm shown here is seen on the cardiac monitor. the patient has resolution of moderate (5/10) chest pain after 3 doses of sublingual nitroglycerin. blood pressure is 104/70 mm hg. which intervention is most important in reducing this patientâs in-hospital and 30-day mortality rate