The clinical data of the 93 consecutive obstructive HCM patients (57 men) with a mean age of 45.78 ± 13.39 (range 11–74) years who underwent TAESM in Fuwai hospital were collected and analysed. Preoperative TTE showed the peak LVOT gradient to be 91.76 ± 25.08 (13–171) mmHg at rest (all >50 mmHg after physical provocation). The mean interventricular septal thickness was 25.39 ± 6.30 mm (15–46). SAM was identified in all (100%) and MR in 73 patients (73 of 93, 78.5%), of whom 41 were moderate level or more.