OJ-094 Selective Intracoronary Administration of Nitroprusside before Balloon Dilatation Prevents Slow Flow during Primary Angioplasty in Patients with Acute Myocardial Infarction(Acute myocardial infarction, clinical (diagnosis/treatment)-3 (IHD) OJ16,Oral Presentation (Japanese),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society)