Title: Activation Pattern During His-Bundle PacingOmar Yasin MD, MS1, Jamie Bush BS2, Vaibhav Vaidya MBBS1, Jason Tri1, Martin van Zyl, MBBCh1, Peilin Xiao PhD3, Jie Han MD, PhD4, Cory Scheuermann3, Samuel J. Asirvatham, MD1,5, Yong-Mei Cha, M.D1Department of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USABoston Scientific Corporation, Washington DC, USAThe Second Affiliated Hospital of Chongqing Medical University, Chongqing ChinaThe First Affiliated Hospital of Zhejiang University, Hangzhou, ChinaDepartment of Pediatrics and Adolescent Medicine, Mayo clinic, Rochester, MN, USAFunding: NoneDisclosures: NoneCorresponding AuthorYong-Mei Cha, MD, FHRSDepartment of Cardiovascular Diseases, Mayo Clinic200 1st ST SWRochester, MN 55901Email:[email protected]