OJ-219 Combination Therapy with Renin-Angiotensin Inhibitor and β blocker Markedly Improved Postoperative Cardiac Function in Patients with Severe Aortic Regurgitation(Vascular heart disease/Pericarditis/Cardiac tumor-1 (H) OJ37,Oral Presentation (Japanese),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society)