For long-term follow-up in 7.09±1.87 years with 97 patients in the group with pigtail used and 5.94±1.34 years with 64 patients in the without pigtail used, the mitral valve area were respectively 1.6 ± 0.28 cm2 vs 1.58± 0.28 cm2, p=0.65, restenosis rate=22.7% vs 21.87%, p=0.9; event-free survival (death, redo MBV, mitral valve replacement, NYHA functional Class III or IV) in the two groups were 68% vs 71.87%, p=0.66.