1 Department of Cardiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan Province, China.
2 Department of Anesthesiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan Province, China.
3 Department of Anesthesiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan Province, China. Electronic address: wangmaohua@swmu.edu.cn.