Limitations
Firstly, this study was carried out in a single tertiary center and the follow-up period was relatively short. Secondly, limited by the small sample size, further analysis such as multiple linear regression was not performed. Thirdly, there was no comparison with surgery or ASA, but noninferiority in effectiveness and safety was noticed with previous studies.13 Fourthly, there was no assessment of regional wall motion during follow up due to minimal septal ablation area. However, because of significant thickness of LV septum, RF lesion within SAM area was so shallow that might result in less hypokinesis there.