Indication of Warfarin therapy UAT Approach PPAC Approach
Frequency Percentage Frequency Percentage
Aortic valve replacement 14 18.7 16 21.3
Mitral valve replacement with sinus rhythm 22 29.3 27 36.0
Mitral valve replacement with atrial fibrillation 19 25.3 10 13.3
Double valve replacement 20 26.7 22 29.3
Table 2: Warfarin therapy related characteristics of patients.