It is well known that the left internal mammary artery (LIMA) should be the first conduit of choice. Similarly, especially in patients younger than 70 years, other conduits should be search among arterial grafts, such as right internal mammary artery (RIMA) or radial artery (RA). If the RA can be harvested in the meanwhile of LIMA harvesting without time consuming, it is well established that former one has to be grafted only on presence of a good run-off. One of the main criticisms moved to the use of RIMA are linked to technical difficulties in its harvesting it.
Whatever happens, two mammary is better than one. Bonalumi G, Giambuzzi I, Lorusso R, Di Mauro M. J Card Surg. 2021 Jul 7. doi: 10.1111/jocs.1580