La Universitat Autonoma de Barcelona 2 articles published in JoVE Medicine Cooling or Warming the Esophagus to Reduce Esophageal Injury During Left Atrial Ablation in the Treatment of Atrial Fibrillation Jason Zagrodzky1, Mark M. Gallagher2, Lisa W. M. Leung2, Tiffany Sharkoski3, Pasquale Santangeli4, Cory Tschabrunn4, Jose M. Guerra5, Bieito Campos5, John MacGregor6, Jamal Hayat2, Brad Clark7, Alex Mazur8, Marcel Feher9, Martin Arnold9, Mark Metzl10, Jose Nazari10, Erik Kulstad11 1 The goal of this protocol is to describe the use of esophageal temperature modulation to counteract esophageal thermal injury from left atrial ablation for the treatment of atrial fibrillation. Medicine Heterotopic Renal Autotransplantation in a Porcine Model: A Step-by-Step Protocol J. Moritz Kaths1,2, Juan Echeverri1,3, Nicolas Goldaracena1, Kristine S. Louis1, Paul Yip4, Rohan John4, Istvan Mucsi5, Anand Ghanekar1, Darius Bagli6, Markus Selzner1, Lisa A. Robinson2 1Multi Organ Transplant Program, Department of Surgery, Toronto General Hospital, 2Division of Nephrology, The Hospital for Sick Children, 3Programa de Doctorat en Medicina, La Universitat Autónoma de Barcelona, 4Laboratory Medicine and Pathobiology, Toronto General Hospital, 5Department of Medicine, Toronto General Hospital, 6Departments of Surgery (Urology) & Physiology, Developmental & Stem Cell Biology, The Hospital for Sick Children Porcine models of organ transplantation provide an important platform to study mechanisms of organ preservation. This article describes a heterotopic porcine renal autotransplantation model, which allows investigating new approaches to improve the outcome of transplantation using marginal kidney grafts.