Effective and Life-Saving Retrograde Femoral and Jugular Vein Double Lumen Catheter Insertion in Patients with Poor Hemodialysis Venous Access Who Needed Emergency Hemodialysis: A Case Series Running title: Retrograde double lumen catheter insertionAhmad Hosseinzadeh1, Farzad Dalfardi1, Reza Shahriarirad1, 2, Fatemehsadat Pezeshkian1, 2, *, Farhad Keikha31 Thoracic and Vascular Surgery Research Center, Shiraz University of Medical Sciences, Shiraz, 7134814336, Iran2 Student Research Committee, Shiraz University of Medical Sciences, Shiraz, 7134814336, Iran3 School of Medicine, Shiraz University of Medical Sciences, Shiraz, 7134814336, IranCorresponding author: Fatemehsadat Pezeshkian; Shiraz University of Medical Sciences, Shiraz, 7134814336, Iran; ORCID:
