Univariate analysis showed that a preoperative high-gradient AS (peak velocity ≧4 m/sec, OR 5.04, P = 0.001) was associated with a higher incidence of Hb-recovery at 1 year after TAVI, whereas an inverse relationship was shown for patients with CKD (OR 0.44, P = 0.031) or those receiving blood transfusion (OR 0.30, P = 0.015, Table 2). Here, GSTM1 is linked to chronic kidney disease.