Prediktor Kesintasan Pasien Regurgitasi Aorta Berat: Tinjauan terhadap Faktor Klinis, Ekokardiografi, dan Prosedur Penggantian Katup Aorta (PKA) = Predictors of Survival in Patients with Severe Aortic Regurgitation: A Review of Clinical, Echocardiographic, and Aortic Valve Replacement (AVR) Factors