ROMEOS’ Rock and Roll?

A group of ROMEOS decides to recreate their rock and roll music group from the 1960’s. They take out their guitars, drum sets and keyboards and begin rehearsing "I will do anything for love, …” by Meatloaf. However, it is now hard for them to fit into their vintage bell bottoms and look the part of wizen rockers, so they begin a vigorous exercise regime. Unfortunately, the ROMEOS failed to undergo a thorough physical exam prior to engaging in 1960 activity, not to mention their use of “stimulants” associated with that era: “…turn on, tune in, drop out! ...” Drop out, regrettably, now has a totally different meaning for these ROMEOS; too much “I Can’t Believe It’s Not Butter” can lead to a heart attack. In the image, plaque formation in which indicated artery will lead to blockage of blood supply to the right ventricle, the right atrium, the SA and the AV nodes, the latter of which will manifest an irregular heart beat?

Postscript: ROMEOS stands for Retired Old Men Eating Out.

Occlusion of which artery will lead to a block of the AV and SA nodes?