Adenosine has long been considered contraindicated in transplanted hearts, but this is now being questioned in young patients. The Cardiac transplantation page has been updated to reflect this.
Flyer, JN, Zuckerman, WA, Richmond, ME, et al. Prospective Study of Adenosine on Atrioventricular Nodal Conduction in Pediatric and Young Adult Patients After Heart Transplant. Circulation 2017